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# Source code for tecplot.plot.fieldmap

    from builtins import super, int

    from collections import Iterable, namedtuple
    from ctypes import cast
    from enum import Enum
    from textwrap import dedent

    from ..tecutil import _tecutil
    from ..constant import *
    from ..exception import TecplotLogicError, TecplotSystemError
    from .. import session
    from ..session import Style
    from ..tecutil import Index, IndexRange, IndexSet, color_spec, flatten_args, sv
    from .scatter import GeometryScatterSymbol, TextScatterSymbol, Symbol

    class FieldmapStyle(Style):
        def __init__(self, fieldmap, *svargs):
            self.fieldmap = fieldmap
            kw = dict(uniqueid=fieldmap.plot.frame.uid, offset1=fieldmap.index,
                      multiset=True)
            super().__init__(fieldmap._sv, *svargs, **kw)

        def __eq__(self, that):
            return isinstance(that, type(self)) and self.fieldmap == that.fieldmap

        def __ne__(self, that):
            return not (self == that)

    class FieldmapContour(FieldmapStyle):
        """Style control for flooding and contour lines.

        This object controls which contour groups are associated with flooding,
        line placement and line coloring. Three different contour groups may be
        used though there are eight total groups that can be configured in a single
        plot. In this example, we flood by the first contour group (index: 0),
        place contour lines by the second contour group (index: 1) and color the
        lines by the third contour group (index: 2)::

            import numpy as np

            import tecplot as tp
            from tecplot.constant import *
            from tecplot.data.operate import execute_equation

            # Get the active frame, setup a grid (30x30x30)
            # where each dimension ranges from 0 to 30.
            # Add variables P,Q,R to the dataset and give
            # values to the data.
            frame = tp.active_frame()
            dataset = frame.dataset
            for v in ['X','Y','Z','P','Q','R']:
                dataset.add_variable(v)
            zone = dataset.add_ordered_zone('Zone', (30,30,30))
            xx = np.linspace(0,30,30)
            for v,arr in zip(['X','Y','Z'],np.meshgrid(xx,xx,xx)):
                zone.values(v)[:] = arr.ravel()
            execute_equation('{P} = -10 * {X}    +      {Y}**2 + {Z}**2')
            execute_equation('{Q} =       {X}    - 10 * {Y}    - {Z}**2')
            execute_equation('{R} =       {X}**2 +      {Y}**2 - {Z}   ')

            # Enable 3D field plot and turn on contouring
            # with boundary faces
            frame.plot_type = PlotType.Cartesian3D
            plot = frame.plot()
            srf = plot.fieldmap(0).surfaces
            srf.surfaces_to_plot = SurfacesToPlot.BoundaryFaces
            plot.show_contour = True

            # get the contour group associated with the
            # newly created zone
            contour = plot.fieldmap(dataset.zone('Zone')).contour

            # turn on flooding and lines, increase line thickness
            contour.contour_type = ContourType.Overlay
            contour.line_thickness = 0.7

            # assign flooding to the first contour group
            contour.flood_contour_group = plot.contour(0)
            contour.flood_contour_group.variable = dataset.variable('P')
            contour.flood_contour_group.colormap_name = 'Sequential - Yellow/Green/Blue'
            contour.flood_contour_group.legend.show = False

            # assign line placement to the second contour group
            contour.line_group = plot.contour(1)
            contour.line_group.legend.show = False
            contour.line_group.variable = dataset.variable('Q')
            contour.line_group.default_num_levels = 4

            # add labels to the lines based on placement
            contour.line_group.labels.show = True
            contour.line_group.labels.font.size = 3.5
            contour.line_group.labels.font.bold = True

            # assign line coloring to the third contour group
            contour.line_color = plot.contour(2)
            contour.line_color.legend.show = False
            contour.line_color.variable = dataset.variable('R')

            # save image to PNG file
            tp.export.save_png('fieldmap_contour.png', 600, supersample=3)

        .. figure:: /_static/images/fieldmap_contour.png
            :width: 300px
            :figwidth: 300px
        """
        def __init__(self, fieldmap):
            super().__init__(fieldmap, sv.CONTOUR)

        @property
        def show(self):
            """Enable drawing the contours.

            :type: `bool`

            Example usage::

                >>> contour = plot.fieldmap(0).contour
                >>> contour.show = True
            """
            return self._get_style(bool, sv.SHOW)

        @show.setter
        def show(self, value):
            self._set_style(bool(value), sv.SHOW)

        @property
        def contour_type(self):
            """`ContourType` to plot.

            :type: `ContourType`

            Possible values are:

                `ContourType.Flood` (default)
                    Filled color between the contour levels.
                `ContourType.Lines`
                    Lines only.
                `ContourType.Overlay`
                    Lines overlayed on flood.
                `ContourType.AverageCell`
                    Filled color by the average value within cells.
                `ContourType.PrimaryValue`
                    Filled color by the value at the primary corner of the cells.

            In this example, we enable both flooding and contour lines::

                >>> from tecplot.constant import ContourType
                >>> contour = plot.fieldmap(0).contour
                >>> contour.contour_type = ContourType.Overlay
            """
            return self._get_style(ContourType, sv.CONTOURTYPE)

        @contour_type.setter
        def contour_type(self, value):
            self._set_style(ContourType(value), sv.CONTOURTYPE)

        @property
        def flood_contour_group_index(self):
            """The `Index` of the `ContourGroup` to use for flooding.

            :type: `integer <int>` (zero-based index)

            This property sets and gets, by `Index`, the `ContourGroup` used for
            flooding. Changing style on this `ContourGroup` will affect all other
            fieldmaps on the same `Frame` that use it. Example usage::

                >>> contour = plot.fieldmap(0).contour
                >>> contour.flood_contour_group_index = 1
                >>> contour.flood_contour_group.variable = dataset.variable('P')
            """
            return self._get_style(Index, sv.FLOODCOLORING)

        @flood_contour_group_index.setter
        def flood_contour_group_index(self, index):
            self._set_style(Index(index), sv.FLOODCOLORING)

        @property
        def flood_contour_group(self):
            """The `ContourGroup` to use for flooding.

            :type: `ContourGroup`

            This property sets and gets the `ContourGroup` used for flooding.
            Changing style on this `ContourGroup` will affect all other fieldmaps
            on the same `Frame` that use it. Example usage::

                >>> cmap_name = 'Sequential - Yellow/Green/Blue'
                >>> contour = plot.fieldmap(0).contour
                >>> contour.flood_contour_group = plot.contour(1)
                >>> contour.flood_contour_group.variable = dataset.variable('P')
                >>> contour.flood_contour_group.colormap_name = cmap_name
            """
            return self.fieldmap.plot.contour(self.flood_contour_group_index)

        @flood_contour_group.setter
        def flood_contour_group(self, contour_group):
            self.flood_contour_group_index = contour_group.index

        @property
        def line_group_index(self):
            """The `Index` of the `ContourGroup` to use for contour lines.

            :type: `integer <int>` (zero-based index)

            This property sets and gets, by `Index`, the `ContourGroup` used for
            line placement and though all properties of the `ContourGroup` can be
            manipulated through this object, many of them such as color will not
            affect the lines unless the `FieldmapContour.line_color` is set to the
            same `ContourGroup`. Note that changing style on this `ContourGroup`
            will affect all other fieldmaps on the same `Frame` that use it.
            Example usage::

                >>> contour = plot.fieldmap(0).contour
                >>> contour.line_group_index = 2
                >>> contour.line_group.variable = dataset.variable('Z')
            """
            return self._get_style(Index, sv.LINECONTOURGROUP)

        @line_group_index.setter
        def line_group_index(self, index):
            self._set_style(Index(index), sv.LINECONTOURGROUP)

        @property
        def line_group(self):
            """The `ContourGroup` to use for line placement and style.

            :type: `ContourGroup`

            This property sets and gets the `ContourGroup` used for line placement
            and though all properties of the `ContourGroup` can be manipulated
            through this object, many of them such as color will not effect the
            lines unless the `FieldmapContour.line_color` is set to the same
            `ContourGroup`. Note that changing style on this `ContourGroup` will
            affect all other fieldmaps on the same `Frame` that use it. Example
            usage::

                >>> contour = plot.fieldmap(0).contour
                >>> contour.line_group = plot.contour(2)
                >>> contour.line_group.variable = dataset.variable('Z')
            """
            return self.fieldmap.plot.contour(self.line_group_index)

        @line_group.setter
        def line_group(self, contour_group):
            self.line_group_index = contour_group.index

        @property
        def line_color(self):
            """The `Color` or `ContourGroup` to use when coloring the lines.

            :type: `Color` or `ContourGroup`

            FieldmapContour lines can be a solid color or be colored by a
            `ContourGroup` as obtained through the ``plot.contour`` property. Note
            that changing style on this `ContourGroup` will affect all other
            fieldmaps on the same `Frame` that use it. Example usage::

                >>> from tecplot.constant import Color
                >>> contour = plot.fieldmap(1).contour
                >>> contour.line_color = Color.Blue

            Example of setting the color from a `ContourGroup`::

                >>> contour = plot.fieldmap(0).contour
                >>> contour.line_color = plot.contour(1)
                >>> contour.line_color.variable = dataset.variable('P')
            """
            return color_spec(self._get_style(Color, sv.COLOR), self.fieldmap.plot)

        @line_color.setter
        def line_color(self, value):
            self._set_style(color_spec(value), sv.COLOR)

        @property
        def line_pattern(self):
            """`LinePattern` type to use for contour lines.

            :type: `LinePattern`

            Possible values: `Solid <LinePattern.Solid>`, `Dashed`, `DashDot`,
            `Dotted`, `LongDash`, `DashDotDot`.

            Example usage::

                >>> from tecplot.constant import LinePattern
                >>> contour = plot.fieldmap(0).contour
                >>> contour.line_pattern = LinePattern.DashDotDot
            """
            return self._get_style(LinePattern, sv.LINEPATTERN)

        @line_pattern.setter
        def line_pattern(self, value):
            self._set_style(LinePattern(value), sv.LINEPATTERN)

        @property
        def line_thickness(self):
            """Thickness (`float`) of the drawn lines.

            :type: `float` in percentage of the `Frame`'s height.

            Example usage::

                >>> contour = plot.fieldmap(0).contour
                >>> contour.line_thickness = 0.7
            """
            return self._get_style(float, sv.LINETHICKNESS)

        @line_thickness.setter
        def line_thickness(self, value):
            self._set_style(float(value), sv.LINETHICKNESS)

        @property
        def pattern_length(self):
            """Length (`float`) of the pattern segment for non-solid lines.

            :type: `float` in percentage of the `Frame`'s height.

            Example usage::

                >>> contour = plot.fieldmap(0).contour
                >>> contour.pattern_length = 3.5
            """
            return self._get_style(float, sv.PATTERNLENGTH)

        @pattern_length.setter
        def pattern_length(self, value):
            self._set_style(float(value), sv.PATTERNLENGTH)

        @property
        def use_lighting_effect(self):
            """Enable lighting effect on this contour.

            :type: `bool`

            Example usage::

                >>> contour = plot.fieldmap(0).contour
                >>> contour.use_lighting_effect = False
            """
            return self._get_style(bool, sv.USELIGHTINGEFFECT)

        @use_lighting_effect.setter
        def use_lighting_effect(self, value):
            self._set_style(bool(value), sv.USELIGHTINGEFFECT)

    class FieldmapEdge(FieldmapStyle):
        """Volume boundary lines.

        An edge plot layer displays the connections of the outer lines
        (``IJ``-ordered zones), finite element surface zones, or planes
        (``IJK``-ordered zones). The FieldmapEdge layer allows you to display the
        edges (creases and borders) of your data. Zone edges exist only for ordered
        zones or 2D finite element zones. Three-dimensional finite element zones do
        not have boundaries.

        .. code-block:: python
            :emphasize-lines: 15,25-28

            import os

            import tecplot as tp
            from tecplot.constant import Color, EdgeType, PlotType, SurfacesToPlot

            examples_dir = tp.session.tecplot_examples_directory()
            datafile = os.path.join(examples_dir, 'SimpleData', 'F18.plt')
            dataset = tp.data.load_tecplot(datafile)
            frame = dataset.frame

            # Enable 3D field plot, turn on contouring and translucency
            frame.plot_type = PlotType.Cartesian3D
            plot = frame.plot()
            plot.show_contour = True
            plot.show_edge = True

            plot.contour(0).colormap_name = 'Sequential - Blue'

            # adjust effects for every fieldmap in this dataset
            for zone in dataset.zones():
                fmap = plot.fieldmap(zone)
                fmap.contour.flood_contour_group.variable = dataset.variable('S')
                fmap.surfaces.surfaces_to_plot = SurfacesToPlot.BoundaryFaces

                edge = fmap.edge
                edge.edge_type = EdgeType.Creases
                edge.color = Color.RedOrange
                edge.line_thickness = 0.7

            # save image to file
            tp.export.save_png('fieldmap_edge.png', 600, supersample=3)

        .. figure:: /_static/images/fieldmap_edge.png
            :width: 300px
            :figwidth: 300px
        """
        def __init__(self, fieldmap):
            super().__init__(fieldmap, sv.EDGELAYER)

        @property
        def show(self):
            """Draw the mesh for this fieldmap.

            :type: `boolean <bool>`

            Example usage::

                >>> plot.show_edge = True
                >>> plot.fieldmap(0).edge.show = True
            """
            return self._get_style(bool, sv.SHOW)

        @show.setter
        def show(self, value):
            self._set_style(bool(value), sv.SHOW)

        @property
        def edge_type(self):
            """Where to draw edge lines.

            :type: `EdgeType`

            Possible values: `Borders`, `Creases`, `BordersAndCreases`.

            Example usage::

                >>> from tecplot.constant import EdgeType
                >>> plot.show_edge = True
                >>> plot.fieldmap(0).edge.edge_type = EdgeType.Creases
            """
            return self._get_style(EdgeType, sv.EDGETYPE)

        @edge_type.setter
        def edge_type(self, value):
            self._set_style(EdgeType(value), sv.EDGETYPE)

        @property
        def color(self):
            """Line `Color`.

            :type: `Color`
            """
            return self._get_style(Color, sv.COLOR)

        @color.setter
        def color(self, value):
            self._set_style(Color(value), sv.COLOR)

        @property
        def line_thickness(self):
            """Thickness of the edge lines drawn.

            :type: `float` in percentage of `Frame` height.

            Example usage::

                >>> plot.fieldmap(0).edge.line_thickness = 0.4
            """
            return self._get_style(float, sv.LINETHICKNESS)

        @line_thickness.setter
        def line_thickness(self, value):
            self._set_style(float(value), sv.LINETHICKNESS)

        @property
        def i_border(self):
            """Which border lines to draw in the ``I``-dimension.

            :type: `BorderLocation`

            Possible values: `None`, `Min <BorderLocation.Min>`, `Max
            <BorderLocation.Max>`, `Both <BorderLocation.Both>`.

            Example usage::

                >>> from tecplot.constant import BorderLocation
                >>> plot.show_edge = True
                >>> plot.fieldmap(0).edge.i_border = BorderLocation.Min
            """
            value = self._get_style(BorderLocation, sv.IBORDER)
            return None if value is BorderLocation.None_ else value

        @i_border.setter
        def i_border(self, value):
            if value is None:
                value = BorderLocation.None_
            self._set_style(BorderLocation(value), sv.IBORDER)

        @property
        def j_border(self):
            """Which border lines to draw in the ``J``-dimension.

            :type: `BorderLocation`

            Possible values: `None`, `Min <BorderLocation.Min>`, `Max
            <BorderLocation.Max>`, `Both <BorderLocation.Both>`.

            Example usage::

                >>> from tecplot.constant import BorderLocation
                >>> plot.show_edge = True
                >>> plot.fieldmap(0).edge.j_border = BorderLocation.Both
            """
            value = self._get_style(BorderLocation, sv.JBORDER)
            return None if value is BorderLocation.None_ else value

        @j_border.setter
        def j_border(self, value):
            if value is None:
                value = BorderLocation.None_
            self._set_style(BorderLocation(value), sv.JBORDER)

        @property
        def k_border(self):
            """Which border lines to draw in the ``K``-dimension.

            :type: `BorderLocation`

            Possible values: `None`, `Min <BorderLocation.Min>`, `Max
            <BorderLocation.Max>`, `Both <BorderLocation.Both>`.

            Example usage::

                >>> from tecplot.constant import BorderLocation
                >>> plot.show_edge = True
                >>> plot.fieldmap(0).edge.k_border = None
            """
            value = self._get_style(BorderLocation, sv.KBORDER)
            return None if value is BorderLocation.None_ else value

        @k_border.setter
        def k_border(self, value):
            if value is None:
                value = BorderLocation.None_
            self._set_style(BorderLocation(value), sv.KBORDER)

    class FieldmapMesh(FieldmapStyle):
        """Lines connecting neighboring data points.

        The mesh plot layer displays the lines connecting neighboring data points
        within a `Zone <data_access>`. For ``I``-ordered data, the mesh is a single line
        connecting all of the points in order of increasing ``I``-index. For
        ``IJ``-ordered data, the mesh consists of two families of lines connecting
        adjacent data points of increasing ``I``-index and increasing ``J``-index.
        For ``IJK``-ordered data, the mesh consists of three families of lines, one
        connecting points of increasing ``I``-index, one connecting points of
        increasing ``J``-index, and one connecting points of increasing
        ``K``-index. For finite element zones, the mesh is a plot of every edge of
        all of the elements that are defined by the connectivity list for the node
        points.

        .. code-block:: python
            :emphasize-lines: 23-25

            from os import path
            import numpy as np
            import tecplot as tp
            from tecplot.constant import PlotType, MeshType

            examples_dir = tp.session.tecplot_examples_directory()
            infile = path.join(examples_dir, 'SimpleData', 'F18.plt')
            dataset = tp.data.load_tecplot(infile)

            # Enable 3D field plot and turn on contouring
            frame = tp.active_frame()
            frame.plot_type = PlotType.Cartesian3D
            plot = frame.plot()
            plot.show_mesh = True

            contour = plot.contour(0)
            contour.variable = dataset.variable('S')
            contour.colormap_name = 'Doppler'
            contour.levels.reset_levels(np.linspace(0.02,0.12,11))

            # set the mesh type and color for all zones
            for zone in dataset.zones():
                mesh = plot.fieldmap(zone).mesh
                mesh.mesh_type = MeshType.HiddenLine
                mesh.color = contour

            # save image to file
            tp.export.save_png('fieldmap_mesh.png', 600, supersample=3)

        .. figure:: /_static/images/fieldmap_mesh.png
            :width: 300px
            :figwidth: 300px
        """
        def __init__(self, fieldmap):
            super().__init__(fieldmap, sv.MESH)

        @property
        def show(self):
            """Draw the mesh for this fieldmap.

            :type: `boolean <bool>`

            Example usage::

                >>> from tecplot.constant import SurfacesToPlot
                >>> plot.show_mesh = True
                >>> surfaces = plot.fieldmap(0).surfaces
                >>> surfaces.surfaces_to_plot = SurfacesToPlot.IPlanes
                >>> plot.fieldmap(0).mesh.show = True
            """
            return self._get_style(bool, sv.SHOW)

        @show.setter
        def show(self, value):
            self._set_style(bool(value), sv.SHOW)

        @property
        def mesh_type(self):
            """`MeshType` to show.

            :type: `MeshType`

            Possible values:

            `Wireframe <MeshType.Wireframe>`
                Wire frame meshes are drawn below any other zone layers on the same
                zone. In 3D Cartesian plots, no hidden lines are removed. For 3D
                volume zones (finite element volume or IJK-ordered), the full 3D
                mesh (consisting of all the connecting lines between data points)
                is not generally drawn because the sheer number of lines would make
                it confusing. The mesh drawn will depend on `FieldmapSurfaces`
                which can be obtained through the parent fieldmap with
                ``mesh.fieldmap.surfaces``::

                    from tecplot.constant import MeshType, SurfacesToPlot
                    mesh = plot.fieldmap(0).mesh
                    mesh.mesh_type = MeshType.Wireframe
                    surfaces = mesh.fieldmap.surfaces
                    surfaces.surfaces_to_plot = SurfacesToPlot.IPlanes

                By default, only the mesh on exposed cell faces is shown.

            `Overlay <MeshType.Overlay>`
                Similar to Wire Frame, mesh lines are drawn over all other zone
                layers except for vectors and scatter symbols. In 3D Cartesian
                plots, the area behind the cells of the plot is still visible
                (unless another plot type such as contour flooding prevents this).
                As with Wire Frame, the mesh drawn will depend on
                `FieldmapSurfaces` which can be obtained through the parent
                fieldmap with ``mesh.fieldmap.surfaces``.

            `HiddenLine <MeshType.HiddenLine>`
                Similar to Overlay, except hidden lines are removed from behind the
                mesh. In effect, the cells (elements) of the mesh are opaque.
                FieldmapSurfaces and lines that are hidden behind another surface
                are removed from the plot. For 3D volume zones, using this plot
                type obscures everything inside the zone. If you choose this option
                for 3D volume zones, then choosing to plot every surface with::

                    from tecplot.constant import HiddenLine, SurfacesToPlot
                    mesh = plot.fieldmap(0).mesh
                    mesh.mesh_type = MeshType.HiddenLine
                    surfaces = mesh.fieldmap.surfaces
                    surfaces.surfaces_to_plot = SurfacesToPlot.All

                has the same effect as plotting only exposed cell faces with::

                    surfaces.surfaces_to_plot = SurfacesToPlot.ExposedCellFaces

                but is much slower.
            """
            return self._get_style(MeshType, sv.MESHTYPE)

        @mesh_type.setter
        def mesh_type(self, value):
            self._set_style(MeshType(value), sv.MESHTYPE)

        @property
        def color(self):
            """The `Color` or `ContourGroup` to use when drawing the lines.

            :type: `Color` or `ContourGroup`

            FieldmapContour lines can be a solid color or be colored by a
            `ContourGroup` as obtained through the ``plot.contour`` property. Note
            that changing style on this `ContourGroup` will affect all other
            fieldmaps on the same `Frame` that use it. Example usage::

                >>> from tecplot.constant import Color
                >>> plot.fieldmap(1).mesh.color = Color.Blue

            Example of setting the color from a `ContourGroup`::

                >>> plot.fieldmap(1).mesh.color = plot.contour(1)
            """
            return color_spec(self._get_style(Color, sv.COLOR), self.fieldmap.plot)

        @color.setter
        def color(self, value):
            self._set_style(color_spec(value), sv.COLOR)

        @property
        def line_pattern(self):
            """`LinePattern` type to use for mesh lines.

            :type: `LinePattern`

            Possible values: `Solid <LinePattern.Solid>`, `Dashed`, `DashDot`,
            `Dotted`, `LongDash`, `DashDotDot`.

            Example usage::

                >>> from tecplot.constant import LinePattern
                >>> mesh = plot.fieldmap(0).mesh
                >>> mesh.line_pattern = LinePattern.Dashed
            """
            return self._get_style(LinePattern, sv.LINEPATTERN)

        @line_pattern.setter
        def line_pattern(self, value):
            self._set_style(LinePattern(value), sv.LINEPATTERN)

        @property
        def line_thickness(self):
            """Thickness (`float`) of the drawn lines.

            :type: `float` in percentage of the `Frame`'s height.

            Example usage::

                >>> plot.fieldmap(0).mesh.line_thickness = 0.7
            """
            return self._get_style(float, sv.LINETHICKNESS)

        @line_thickness.setter
        def line_thickness(self, value):
            self._set_style(float(value), sv.LINETHICKNESS)

        @property
        def pattern_length(self):
            """Length (`float`) of the pattern segment for non-solid lines.

            :type: `float` in percentage of the `Frame`'s height.

            Example usage::

                >>> plot.fieldmap(0).mesh.pattern_length = 3.5
            """
            return self._get_style(float, sv.PATTERNLENGTH)

        @pattern_length.setter
        def pattern_length(self, value):
            self._set_style(float(value), sv.PATTERNLENGTH)

    class FieldmapPoints(FieldmapStyle):
        """Type and density of the points used for vector and scatter plots.

        This object controls the location of the points for `FieldmapVector` and
        `FieldmapScatter` plots relative to the cells.

        .. code-block:: python
            :emphasize-lines: 18-22

            from os import path
            import tecplot as tp
            from tecplot.constant import PlotType, PointsToPlot

            examples_dir = tp.session.tecplot_examples_directory()
            infile = path.join(examples_dir, 'SimpleData', 'HeatExchanger.plt')
            dataset = tp.data.load_tecplot(infile)

            # Enable 3D field plot and turn on contouring
            frame = tp.active_frame()
            frame.plot_type = PlotType.Cartesian2D
            plot = frame.plot()
            plot.vector.u_variable = dataset.variable('U(M/S)')
            plot.vector.v_variable = dataset.variable('V(M/S)')
            plot.show_vector = True

            for zone in dataset.zones():
                points = plot.fieldmap(zone).points
                points.points_to_plot = PointsToPlot.SurfaceCellCenters
                points.step = (2,2)

            # save image to file
            tp.export.save_png('fieldmap_points.png', 600, supersample=3)

        .. figure:: /_static/images/fieldmap_points.png
            :width: 300px
            :figwidth: 300px
        """
        def __init__(self, fieldmap):
            super().__init__(fieldmap, sv.POINTS)

        _IJKStep = namedtuple('IJKStep', ['i', 'j', 'k'])
        _IJKStep.__new__.__defaults__ = (None, None, None)

        @property
        def points_to_plot(self):
            """Location of the points to show.

            :type: `PointsToPlot`

            Possible values:

            `SurfaceNodes`
                Draws only the nodes that are on the surface of the `Zone <data_access>`.

            `AllNodes`
                Draws all nodes in the `Zone <data_access>`.

            `SurfaceCellCenters`
                Draws points at the cell centers which are on or near the surface
                of the `Zone <data_access>`.

            `AllCellCenters`
                 Draws points at all cell centers in the `Zone <data_access>`.

            `AllConnected`
                Draws all the nodes that are connected by the node map. Nodes
                without any connectivity are not drawn.

            Example usage::

                >>> from tecplot.constant import PointsToPlot
                >>> pts = plot.fieldmap(0).points
                >>> sts.points_to_plot = PointsToPlot.SurfaceCellCenters
            """
            return self._get_style(PointsToPlot, sv.POINTSTOPLOT)

        @points_to_plot.setter
        def points_to_plot(self, points):
            self._set_style(PointsToPlot(points), sv.POINTSTOPLOT)

        @property
        def step(self):
            """Step along the dimensions (``I``, ``J``, ``K``).

            :type: `tuple` of `integers <int>`

            This property specifies the ``I``, ``J``, and ``K``-step intervals. For
            irregular and finite element data, only the first parameter or
            ``I``-Step has an effect. This steps through the nodes in the order
            they are listed in the data file. In this case, a single number can be
            given, but note that the return type is always a 3-`tuple` for both
            ordered and irregular data.

            Example for ``IJK`` ordered data::

                >>> plot.fieldmap(0).points.step = (10,10,None)
                >>> print(plot.fieldmap(0).points.step)
                (10, 10, 1)

            Example for irregular data::

                >>> plot.fieldmap(0).points.step = 10
                >>> print(plot.fieldmap(0).points.step)
                (10, 1, 1)
            """
            return tuple(FieldmapPoints._IJKStep(
                         self._get_style(int, sv.IJKSKIP, sv.I),
                         self._get_style(int, sv.IJKSKIP, sv.J),
                         self._get_style(int, sv.IJKSKIP, sv.K)))

        @step.setter
        def step(self, *values):
            ijkstep = FieldmapPoints._IJKStep(*flatten_args(*values))
            self._set_style(int(ijkstep.i or 1), sv.IJKSKIP, sv.I)
            self._set_style(int(ijkstep.j or 1), sv.IJKSKIP, sv.J)
            self._set_style(int(ijkstep.k or 1), sv.IJKSKIP, sv.K)

    class FieldmapScatter(FieldmapStyle):
        """Plot of nodes using symbols.

        `FieldmapScatter` plots display symbols at the data points in a field. The
        symbols may be sized according to the values of a specified variable,
        colored by the values of the contour variable, or may be uniformly sized or
        colored. Unlike contour plots, scatter plots do not require any mesh
        structure connecting the points, allowing scatter plots of irregular data.

        .. code-block:: python
            :emphasize-lines: 12,14-17

            from os import path
            import tecplot as tp
            from tecplot.constant import PlotType, SymbolType, FillMode

            examples_dir = tp.session.tecplot_examples_directory()
            infile = path.join(examples_dir, 'SimpleData', 'HeatExchanger.plt')
            dataset = tp.data.load_tecplot(infile)

            frame = tp.active_frame()
            frame.plot_type = PlotType.Cartesian2D
            plot = frame.plot()
            plot.show_scatter = True

            for z in dataset.zones():
                scatter = plot.fieldmap(z).scatter
                scatter.symbol_type = SymbolType.Geometry
                scatter.fill_mode = FillMode.UseSpecificColor
                scatter.fill_color = plot.contour(0)
                scatter.size = 1

            tp.export.save_png('fieldmap_scatter.png', 600, supersample=3)

        .. figure:: /_static/images/fieldmap_scatter.png
            :width: 300px
            :figwidth: 300px
        """
        def __init__(self, fieldmap):
            super().__init__(fieldmap, sv.SCATTER)

        @property
        def show(self):
            """Show the scatter symbols.

            :type: `boolean <bool>`

            Example usage::

                >>> plot.show_scatter = True
                >>> plot.fieldmap(2).scatter.show = True
            """
            return self._get_style(bool, sv.SHOW)

        @show.setter
        def show(self, value):
            self._set_style(bool(value), sv.SHOW)

        @property
        def symbol_type(self):
            """The `SymbolType` to use for this scatter plot.

            :type: `SymbolType`

            Possible values are: `Geometry`, `Text <SymbolType.Text>`.

            Example usage::

                >>> from tecplot.constant import SymbolType
                >>> plot.fieldmap(0).scatter.symbol_type = SymbolType.Text
            """
            return Symbol(self)._symbol_type

        @symbol_type.setter
        def symbol_type(self, value):
            Symbol(self)._symbol_type = value

        def symbol(self, symbol_type=None):
            """Returns a scatter symbol style object.

            Parameters:
                symbol_type (`SymbolType`, optional): The type of symbol to return.
                    By default, this will return the active symbol type which is
                    obtained from `FieldmapScatter.symbol_type`.

            Returns: `TextScatterSymbol` or `GeometryScatterSymbol`

            Example usage::

                >>> from tecplot.constant import SymbolType
                >>> plot.fieldmap(0).scatter.symbol_type = SymbolType.Text
                >>> symbol = plot.fieldmap(0).scatter.symbol()
                >>> symbol.text = 'a'
            """
            _dispatch = {
                SymbolType.Text: TextScatterSymbol,
                SymbolType.Geometry: GeometryScatterSymbol}
            return _dispatch[symbol_type or self.symbol_type](self)

        @property
        def size(self):
            """Size of the symbols to draw.

            :type: `float`

            Example usage::

                >>> plot.fieldmap(0).scatter.size = 4
            """
            return self._get_style(float, sv.FRAMESIZE)

        @size.setter
        def size(self, value):
            self._set_style(float(value), sv.FRAMESIZE)

        @property
        def size_by_variable(self):
            """Use a variable to determine relative size of symbols.

            :type: `bool`

            Example usage::

                >>> plot.scatter.variable = dataset.variable('P')
                >>> plot.fieldmap(0).scatter.size_by_variable = True
            """
            return self._get_style(bool, sv.SIZEBYVARIABLE)

        @size_by_variable.setter
        def size_by_variable(self, value):
            try:
                self._set_style(bool(value), sv.SIZEBYVARIABLE)
            except TecplotSystemError as e:
                if str(e) == str(SetValueReturnCode.ContextError1):
                    msg = dedent('''\
                    A scatter variable must be set using the
                        plot.scatter.variable property.''')
                    raise TecplotLogicError(msg)
                else:
                    raise

        @property
        def line_thickness(self):
            """Width of the lines when drawing symbols.

            :type: `float`

            Example usage::

                >>> from tecplot.constant import SymbolType
                >>> scatter = plot.fieldmap(0).scatter
                >>> scatter.symbol_type = SymbolType.Geometry
                >>> scatter.line_thickness = 1
            """
            return self._get_style(float, sv.LINETHICKNESS)

        @line_thickness.setter
        def line_thickness(self, value):
            self._set_style(float(value), sv.LINETHICKNESS)

        @property
        def color(self):
            """Line `Color` or `ContourGroup` of the drawn symbols.

            :type: `Color` or `ContourGroup`

            This can be a solid color or  a `ContourGroup` as obtained through the
            ``plot.contour`` property. Note that changing style on the
            `ContourGroup` will affect all other fieldmaps in the same `Frame` that
            use it. Example usage::

                >>> from tecplot.constant import Color
                >>> plot.fieldmap(1).scatter.color = Color.Blue

            Example of setting the color from a `ContourGroup`::

                >>> plot.fieldmap(1).scatter.color = plot.contour(1)
            """
            return color_spec(self._get_style(Color, sv.COLOR),
                              self.fieldmap.plot)

        @color.setter
        def color(self, value):
            self._set_style(color_spec(value), sv.COLOR)

        @property
        def fill_mode(self):
            """Fill mode for the background color.

            :type: `FillMode.UseSpecificColor`, `FillMode.UseLineColor`,
                `FillMode.UseBackgroundColor` or `FillMode.None_`.

            Example usage::

                >>> from tecplot.constant import Color, SymbolType, FillMode
                >>> scatter = plot.fieldmap(0).scatter
                >>> scatter.symbol_type = SymbolType.Geometry
                >>> scatter.fill_mode = FillMode.UseSpecificColor
                >>> scatter.fill_color = Color.Red
            """
            return self._get_style(FillMode, sv.FILLMODE)

        @fill_mode.setter
        def fill_mode(self, value):
            self._set_style(FillMode(value), sv.FILLMODE)

        @property
        def fill_color(self):
            """Fill or background color.

            :type: `Color`, `ContourGroup`.

            The ``fill_mode`` attribute must be set accordingly::

                >>> from tecplot.constant import Color, SymbolType, FillMode
                >>> scatter = plot.fieldmap(0).scatter
                >>> scatter.symbol_type = SymbolType.Geometry
                >>> scatter.fill_mode = FillMode.UseSpecificColor
                >>> scatter.fill_color = Color.Red
            """
            return color_spec(self._get_style(Color, sv.FILLCOLOR),
                              self.fieldmap.plot)

        @fill_color.setter
        def fill_color(self, value):
            self._set_style(color_spec(value), sv.FILLCOLOR)

    class FieldmapSurfaces(FieldmapStyle):
        """Plot surfaces from volume data.

        This class controls viewing volume data as surfaces, either via a boundary
        surface or one or more planes along the ``I``, ``J``, ``K`` dimensions for
        ordered data.

        .. code-block:: python
            :emphasize-lines: 33,39,42

            import numpy as np

            import tecplot as tp
            from tecplot.constant import *
            from tecplot.data.operate import execute_equation

            # Get the active frame, setup a grid (30x30x30)
            # where each dimension ranges from 0 to 30.
            # Add variable P to the dataset and give
            # values to the data.
            frame = tp.active_frame()
            dataset = frame.dataset
            for v in ['X','Y','Z','P']:
                dataset.add_variable(v)
            zone = dataset.add_ordered_zone('Zone', (30,30,30))
            xx = np.linspace(0,30,30)
            for v,arr in zip(['X','Y','Z'],np.meshgrid(xx,xx,xx)):
                zone.values(v)[:] = arr.ravel()
            execute_equation('{P} = -10*{X} + {Y}**2 + {Z}**2')

            # Enable 3D field plot and turn on contouring
            frame.plot_type = PlotType.Cartesian3D
            plot = frame.plot()
            plot.show_contour = True

            # get a handle of the fieldmap for this zone
            fmap = plot.fieldmap(dataset.zone('Zone'))

            # set the active contour group to flood by variable P
            fmap.contour.flood_contour_group.variable = dataset.variable('P')

            # show I and J-planes through the surface
            fmap.surfaces.surfaces_to_plot = SurfacesToPlot.IJPlanes

            # show only the first and last I-planes
            # min defaults to 0, max defaults to -1
            # we set step to -1 which is equivalent
            # to the I-dimensions's max
            fmap.surfaces.i_range = None,None,-1

            # show J-planes at indices: [5, 15, 25]
            fmap.surfaces.j_range = 5,25,10

            # save image to file
            tp.export.save_png('fieldmap_surfaces_ij.png', 600, supersample=3)

        .. figure:: /_static/images/fieldmap_surfaces_ij.png
            :width: 300px
            :figwidth: 300px
        """
        def __init__(self, fieldmap):
            super().__init__(fieldmap, sv.SURFACES)

        @property
        def surfaces_to_plot(self):
            """The surfaces to show.

            :type: `SurfacesToPlot`

            Possible values: `BoundaryFaces`, `ExposedCellFaces`, `IPlanes
            <SurfacesToPlot.IPlanes>`, `JPlanes <SurfacesToPlot.JPlanes>`, `KPlanes
            <SurfacesToPlot.KPlanes>`, `IJPlanes`, `JKPlanes`, `IKPlanes`,
            `IJKPlanes`, `All <SurfacesToPlot.All>`, the python built-in `None`.

            Options such as `IJKPlanes` show planes from multiple dimensions. For
            example, the `IJPlanes` value shows both the ``I``-planes and the
            ``J``-planes. The following example shows a 3D field plot using faces
            on the boundary::

                >>> from tecplot.constant import SurfacesToPlot
                >>> frame.plot_type = PlotType.Cartesian3D
                >>> srf = frame.plot().fieldmap(0).surfaces
                >>> srf.surfaces_to_plot = SurfacesToPlot.BoundaryFaces
            """
            value = self._get_style(SurfacesToPlot, sv.SURFACESTOPLOT)
            if value == SurfacesToPlot.None_:
                return None
            else:
                return value

        @surfaces_to_plot.setter
        def surfaces_to_plot(self, surfaces):
            if surfaces is None:
                surfaces = SurfacesToPlot.None_
            self._set_style(SurfacesToPlot(surfaces), sv.SURFACESTOPLOT)

        @property
        def i_range(self):
            """`IndexRange` for the *I* dimension of ordered data.

            :type: `tuple` of `integers <int>` (min, max, step)

            This example shows ``I``-planes at ``i = [0, 2, 4, 6, 8, 10]``::

                >>> from tecplot.constant import SurfacesToPlot
                >>> srf = frame.plot().fieldmap(0).surfaces
                >>> srf.surfaces_to_plot = SurfacesToPlot.IPlanes
                >>> srf.i_range = 0, 10, 2
            """
            return self._get_style(IndexRange, sv.IRANGE)

        @i_range.setter
        def i_range(self, values):
            self._set_style(IndexRange(*values), sv.IRANGE)

        @property
        def j_range(self):
            """`IndexRange` for the *J* dimension of ordered data.

            :type: `tuple` of `integers <int>` (min, max, step)

            This example shows all ``J``-planes starting with ``j = 10`` up to the
            maximum ``J``-plane of the associated `Zone <data_access>`::

                >>> from tecplot.constant import SurfacesToPlot
                >>> srf = frame.plot().fieldmap(0).surfaces
                >>> srf.surfaces_to_plot = SurfacesToPlot.JPlanes
                >>> srf.j_range = 10, None, 1
            """
            return self._get_style(IndexRange, sv.JRANGE)

        @j_range.setter
        def j_range(self, values):
            self._set_style(IndexRange(*values), sv.JRANGE)

        @property
        def k_range(self):
            """`IndexRange` for the *K* dimension of ordered data.

            :type: `tuple` of `integers <int>` (min, max, step)

            This example shows all ``K``-planes starting with the first up to 5
            from the last ``K``-plane of the associated `Zone <data_access>`::

                >>> from tecplot.constant import SurfacesToPlot
                >>> srf = frame.plot().fieldmap(0).surfaces
                >>> srf.surfaces_to_plot = SurfacesToPlot.KPlanes
                >>> srf.k_range = None, -5
            """
            return self._get_style(IndexRange, sv.KRANGE)

        @k_range.setter
        def k_range(self, values):
            self._set_style(IndexRange(*values), sv.KRANGE)

    class FieldmapVector(FieldmapStyle):
        """Field plot of arrows.

        Before doing anything with vector plots, one must set the variables to be
        used for the ``(U, V, W)`` coordinates. This is done through the plot
        object. Once set, the vectors can be displayed and manipulated using this
        class:

        .. code-block:: python
            :emphasize-lines: 23-25,31-36

            import numpy as np
            import tecplot as tp
            from tecplot.data.operate import execute_equation
            from tecplot.constant import (PlotType, PointsToPlot, VectorType,
                                          ArrowheadStyle)

            frame = tp.active_frame()
            dataset = frame.dataset
            for v in ['X','Y','Z','P','Q','R']:
                dataset.add_variable(v)
            zone = dataset.add_ordered_zone('Zone', (30,30,30))
            xx = np.linspace(0,30,30)
            for v,arr in zip(['X','Y','Z'],np.meshgrid(xx,xx,xx)):
                zone.values(v)[:] = arr.ravel()
            execute_equation('{P} = -10 * {X}    +      {Y}**2 + {Z}**2')
            execute_equation('{Q} =       {X}    - 10 * {Y}    - {Z}**2')
            execute_equation('{R} =       {X}**2 +      {Y}**2 - {Z}   ')

            frame.plot_type = PlotType.Cartesian3D
            plot = frame.plot()
            plot.contour(0).variable = dataset.variable('P')
            plot.contour(0).colormap_name = 'Two Color'
            plot.vector.u_variable = dataset.variable('P')
            plot.vector.v_variable = dataset.variable('Q')
            plot.vector.w_variable = dataset.variable('R')
            plot.show_vector = True

            points = plot.fieldmap(0).points
            points.points_to_plot = PointsToPlot.AllNodes
            points.step = (5,3,2)

            vector = plot.fieldmap(0).vector
            vector.show = True
            vector.vector_type = VectorType.MidAtPoint
            vector.arrowhead_style = ArrowheadStyle.Filled
            vector.color = plot.contour(0)
            vector.line_thickness = 0.4

            # save image to file
            tp.export.save_png('fieldmap_vector.png', 600, supersample=3)

        .. figure:: /_static/images/fieldmap_vector.png
            :width: 300px
            :figwidth: 300px
        """
        def __init__(self, fieldmap):
            super().__init__(fieldmap, sv.VECTOR)

        @property
        def show(self):
            """Enable drawing vectors on the plot.

            :type: `bool`

            Example usage::

                >>> plot.show_vector = True
                >>> plot.fieldmap(0).vector.show = True
            """
            return self._get_style(bool, sv.SHOW)

        @show.setter
        def show(self, value):
            self._set_style(bool(value), sv.SHOW)

        @property
        def vector_type(self):
            """Anchor point of the drawn vectors.

            :type: `VectorType`

            Possible values: `TailAtPoint`, `HeadAtPoint`, `MidAtPoint`, `HeadOnly`.

            Example usage::

                >>> from tecplot.constant import VectorType
                >>> plot.fieldmap(0).vector.vector_type = VectorType.MidAtPoint
            """
            return self._get_style(VectorType, sv.VECTORTYPE)

        @vector_type.setter
        def vector_type(self, value):
            self._set_style(VectorType(value), sv.VECTORTYPE)

        @property
        def tangent_only(self):
            """Show only tangent vectors.

            Set to `True` to display **only** the tangent component of vectors.
            Tangent vectors are drawn on 3D surfaces only where it is possible to
            determine a vector normal to the surface. A plot where multiple
            surfaces intersect each other using common nodes is a case where
            tangent vectors are not drawn because there is more than one normal to
            choose from. An example of this would be a volume ``IJK``-ordered zone
            where both the ``I`` and ``J``-planes are shown. If tangent vectors
            cannot be drawn, then regular vectors are plotted instead.

            :type: `bool`

            Example usage::

                >>> plot.fieldmap(0).vector.tangent_only = True
            """
            return self._get_style(bool, sv.ISTANGENT)

        @tangent_only.setter
        def tangent_only(self, value):
            self._set_style(bool(value), sv.ISTANGENT)

        @property
        def color(self):
            """The `Color` or `ContourGroup` to use when drawing vectors.

            :type: `Color` or `ContourGroup`

            FieldmapVectors can be a solid color or be colored by a `ContourGroup`
            as obtained through the ``plot.contour`` property. Note that changing
            style on this `ContourGroup` will affect all other fieldmaps on the
            same `Frame` that use it. Example usage::

                >>> from tecplot.constant import Color
                >>> plot.fieldmap(1).vector.color = Color.Blue

            Example of setting the color from a `ContourGroup`::

                >>> plot.fieldmap(1).vector.color = plot.contour(1)
            """
            return color_spec(self._get_style(Color, sv.COLOR), self.fieldmap.plot)

        @color.setter
        def color(self, value):
            self._set_style(color_spec(value), sv.COLOR)

        @property
        def arrowhead_style(self):
            """The `ArrowheadStyle` drawn.

            :type: `ArrowheadStyle`

            Possible values: `Plain`, `Filled <ArrowheadStyle.Filled>`,
            `Hollow <ArrowheadStyle.Hollow>`.

            Example usage::

                >>> from tecplot.constant import ArrowheadStyle
                >>> plot.fieldmap(0).vector.arrowhead_style = ArrowheadStyle.Filled
            """
            return self._get_style(ArrowheadStyle, sv.ARROWHEADSTYLE)

        @arrowhead_style.setter
        def arrowhead_style(self, value):
            self._set_style(ArrowheadStyle(value), sv.ARROWHEADSTYLE)

        @property
        def line_pattern(self):
            """The `LinePattern` used to draw the arrow line.

            :type: `LinePattern`

            Possible values: `Solid <LinePattern.Solid>`, `Dashed`, `DashDot`,
            `Dotted`, `LongDash`, `DashDotDot`.

            Example usage::

                >>> from tecplot.constant import LinePattern
                >>> vector = plot.fieldmap(0).vector
                >>> vector.line_pattern = LinePattern.DashDot
            """
            return self._get_style(LinePattern, sv.LINEPATTERN)

        @line_pattern.setter
        def line_pattern(self, value):
            self._set_style(LinePattern(value), sv.LINEPATTERN)

        @property
        def line_thickness(self):
            """The width of the arrow line.

            :type: `float` (percentage of `Frame` height)

            Example usage::

                >>> from tecplot.constant import LinePattern
                >>> vector = plot.fieldmap(0).vector.line_thickness = 0.7
            """
            return self._get_style(float, sv.LINETHICKNESS)

        @line_thickness.setter
        def line_thickness(self, value):
            self._set_style(float(value), sv.LINETHICKNESS)

        @property
        def pattern_length(self):
            """Length of the pattern used when drawing vector lines.

            :type: `float` (percentage of `Frame` height)

            Example usage::

                >>> from tecplot.constant import LinePattern
                >>> vector = plot.fieldmap(0).vector
                >>> vector.line_pattern = LinePattern.Dashed
                >>> vector.pattern_length = 3.5
            """
            return self._get_style(float, sv.PATTERNLENGTH)

        @pattern_length.setter
        def pattern_length(self, value):
            self._set_style(float(value), sv.PATTERNLENGTH)

    class Fieldmap(Style):
        """Style control for a specific `Zone <data_access>` attached to a specific `Frame`.

        The fieldmap connects the plotting style and various elements of the plot
        to a specific `Zone <data_access>` in the `Dataset` attached to a specific `Frame`. This
        object is obtained through the ``plot.fieldmap()`` method:

        .. code-block:: python
            :emphasize-lines: 16-17

            import os
            import numpy
            import tecplot

            examples_dir = tecplot.session.tecplot_examples_directory()
            infile = os.path.join(examples_dir, 'SimpleData', 'F18.lay')
            tecplot.load_layout(infile)
            frame = tecplot.active_frame()
            plot = frame.plot()
            dataset = frame.dataset

            plot.contour(0).colormap_name = 'GrayScale'
            plot.contour(0).legend.show = False

            for zone_name in ['left wing', 'right wing']:
                fmap = frame.plot().fieldmap(dataset.zone(zone_name))
                fmap.contour.flood_contour_group = plot.contour(1)

            plot.contour(1).colormap_name = 'Sequential - Yellow/Green/Blue'
            plot.contour(1).levels.reset_levels(numpy.linspace(-0.07, 0.07, 50))

            tecplot.export.save_png('F18_wings.png', 600, supersample=3)

        .. figure:: /_static/images/fieldmap.png
            :width: 300px
            :figwidth: 300px
        """
        def __init__(self, index, plot):
            self.index = Index(index)
            self.plot = plot
            super().__init__(sv.FIELDMAP, uniqueid=self.plot.frame.uid,
                             offset1=self.index, multiset=True)

        def __eq__(self, that):
            return (isinstance(that, type(self)) and
                    self.plot == that.plot and
                    self.index == that.index)

        def __ne__(self, that):
            return not (self == that)

        @property
        def show(self):
            """Display this fieldmap on the plot.

            :type: `bool`

            Example usage for turning on all fieldmaps::

                >>> for fmap in plot.fieldmaps():
                ...     fmap.show = True
            """
            return self.index in self.plot.active_fieldmap_indices

        @show.setter
        def show(self, show):
            assignment = AssignOp.PlusEquals if show else AssignOp.MinusEquals
            session.set_style({self.index}, sv.ACTIVEFIELDMAPS,
                              assignmodifier=assignment,
                              uniqueid=self.plot.frame.uid)

        @property
        def group(self):
            """Zero-based group number for this `Fieldmap`.

            :type: `integer <int>`

            This is a piece of auxiliary data and can be useful for identifying a
            subset of fieldmaps. For example, to loop over all fieldmaps that have
            group set to 4::

                >>> plot.fieldmap(0).group = 4
                >>> plot.fieldmap(3).group = 4
                >>> for fmap in filter(lambda f: f.group == 4, plot.fieldmaps()):
                ...     print(fmap.index)
                0
                3
            """
            return self._get_style(Index, sv.GROUP)

        @group.setter
        def group(self, value):
            self._set_style(Index(value), sv.GROUP)

        @property
        def zones(self):
            """List of zones used by this fieldmap.

            :type: generator of `Zones <data_access>`

            Example usage::

                >>> for zone in fieldmap.zones:
                ...     print(zone.name)
                Zone 1
                Zone 2
            """
            with self.plot.frame.activated():
                success, zones_ptr = _tecutil.FieldMapGetZones(self.index + 1)
                if not success:
                    raise TecplotSystemError()
            zones_indexset = cast(zones_ptr, IndexSet)
            zone_indices = set(zones_indexset)
            zones_indexset.dealloc()
            for index in zone_indices:
                yield self.plot.frame.dataset.zone(index)

        @property
        def contour(self):
            """`FieldmapContour` style including flooding, lines and line coloring.

            :type: `FieldmapContour`
            """
            return FieldmapContour(self)

        @property
        def edge(self):
            """`FieldmapEdge` style control for boundary lines.

            :type: `FieldmapEdge`
            """
            return FieldmapEdge(self)

        @property
        def mesh(self):
            """`FieldmapMesh` style lines connecting neighboring data points.

            :type: `FieldmapMesh`
            """
            return FieldmapMesh(self)

        @property
        def scatter(self):
            """`FieldmapScatter` style for scatter plots.

            :type: `FieldmapScatter`
            """
            return FieldmapScatter(self)

        @property
        def surfaces(self):
            """`FieldmapSurfaces` object to control which surfaces to draw.

            :type: `FieldmapSurfaces`
            """
            return FieldmapSurfaces(self)

        @property
        def points(self):
            """`FieldmapPoints` object to control which points to draw.

            :type: `FieldmapPoints`
            """
            return FieldmapPoints(self)

        @property
        def vector(self):
            """`FieldmapVector` style for vector field plots using arrows.

            :type: `FieldmapVector`
            """
            return FieldmapVector(self)

        @property
        def show_iso_surfaces(self):
            """(`bool`) Enable drawing of Iso-surfaces.

            :type: `boolean <bool>`
            """
            return self._get_style(bool, sv.VOLUMEMODE, sv.VOLUMEOBJECTSTOPLOT,
                                   sv.SHOWISOSURFACES)

        @show_iso_surfaces.setter
        def show_iso_surfaces(self, show):
            self._set_style(bool(show), sv.VOLUMEMODE, sv.VOLUMEOBJECTSTOPLOT,
                            sv.SHOWISOSURFACES)

        @property
        def show_slices(self):
            """(`bool`) Enable drawing of slice surfaces.

            :type: `boolean <bool>`
            """
            return self._get_style(bool, sv.VOLUMEMODE, sv.VOLUMEOBJECTSTOPLOT,
                                   sv.SHOWSLICES)

        @show_slices.setter
        def show_slices(self, show):
            self._set_style(bool(show), sv.VOLUMEMODE, sv.VOLUMEOBJECTSTOPLOT,
                            sv.SHOWSLICES)

        @property
        def show_streamtraces(self):
            """(`bool`) Enable drawing of streamtraces.

            :type: `boolean <bool>`
            """
            return self._get_style(bool, sv.VOLUMEMODE, sv.VOLUMEOBJECTSTOPLOT,
                                   sv.SHOWSTREAMTRACES)

        @show_streamtraces.setter
        def show_streamtraces(self, show):
            self._set_style(bool(show), sv.VOLUMEMODE, sv.VOLUMEOBJECTSTOPLOT,
                            sv.SHOWSTREAMTRACES)

    class FieldmapEffects(FieldmapStyle):
        """Clipping and blanking style control.

        This object controls value blanking and clipping from plane slices for
        this fieldmap.
        """
        def __init__(self, fieldmap):
            super().__init__(fieldmap, sv.EFFECTS)

        @property
        def value_blanking(self):
            """Enable value blanking effect for this fieldmap.

            :type: `boolean <bool>`

            Example usage::

                >>> plot.fieldmap(0).effects.value_blanking = True
            """
            return self._get_style(bool, sv.USEVALUEBLANKING)

        @value_blanking.setter
        def value_blanking(self, value):
            self._set_style(bool(value), sv.USEVALUEBLANKING)

        @property
        def clip_planes(self):
            """Clip planes to use when drawing this fieldmap.

            :type: `list` of `integers <int>` [0-5] or `None`

            Example usage::

                >>> plot.fieldmap(0).effects.clip_planes = [0,1,2]
            """
            value = self._get_style(list, sv.USECLIPPLANES)
            return value if value else None

        @clip_planes.setter
        def clip_planes(self, value):
            if value is None:
                value = list()
            if not isinstance(value, Iterable):
                value = [value]
            self._set_style(list(value), sv.USECLIPPLANES,
                            **{sv.ASSIGNMODIFIER: AssignOp.Equals})

    class FieldmapEffects3D(FieldmapEffects):
        """Lighting and translucency style control.

        .. code-block:: python
            :emphasize-lines: 23-25

            import os

            import tecplot as tp
            from tecplot.constant import LightingEffect, PlotType, SurfacesToPlot

            examples_dir = tp.session.tecplot_examples_directory()
            datafile = os.path.join(examples_dir, 'SimpleData', 'F18.plt')
            dataset = tp.data.load_tecplot(datafile)
            frame = dataset.frame

            # Enable 3D field plot, turn on contouring and translucency
            frame.plot_type = PlotType.Cartesian3D
            plot = frame.plot()
            plot.show_contour = True
            plot.use_translucency = True

            # adjust effects for every fieldmap in this dataset
            for zone in dataset.zones():
                fmap = plot.fieldmap(zone)
                fmap.contour.flood_contour_group.variable = dataset.variable('S')
                fmap.surfaces.surfaces_to_plot = SurfacesToPlot.BoundaryFaces

                eff = fmap.effects
                eff.lighting_effect = LightingEffect.Paneled
                eff.surface_translucency = 30

            # save image to file
            tp.export.save_png('fieldmap_effects3d.png', 600, supersample=3)

        .. figure:: /_static/images/fieldmap_effects3d.png
            :width: 300px
            :figwidth: 300px
        """

        @property
        def lighting_effect(self):
            """The type of lighting effect to render.

            :type: `LightingEffect`

            Possible values:

            `Paneled <LightingEffect.Paneled>`
                Within each cell, the color assigned to each area by shading or
                contour flooding is tinted by a shade constant across the cell.
                This shade is based on the orientation of the cell relative to your
                3D light source.

            `Gouraud <LightingEffect.Gouraud>`
                This plot type offers smoother, more continuous shading than
                `Paneled <LightingEffect.Paneled>` shading, but it results in
                slower plotting and larger vector images. `Gouraud
                <LightingEffect.Gouraud>` shading is not continuous across zone
                boundaries unless face neighbors are specified in the data and is
                not available for finite element volume zones when blanking is
                active in which case, the zone's lighting effect reverts to
                `Paneled <LightingEffect.Paneled>` shading in this case.

            If ``IJK``-ordered data with `FieldmapSurfaces.surfaces_to_plot` is set
            to `SurfacesToPlot.ExposedCellFaces`, faces exposed by blanking will
            revert to `Paneled <LightingEffect.Paneled>` shading.

            Example usage::

                >>> from tecplot.constant import LightingEffect
                >>> effects = plot.fieldmap(0).effects
                >>> effects.lighting_effect = LightingEffect.Paneled
            """
            return self._get_style(LightingEffect, sv.LIGHTINGEFFECT)

        @lighting_effect.setter
        def lighting_effect(self, value):
            self._set_style(LightingEffect(value), sv.LIGHTINGEFFECT)

        @property
        def use_translucency(self):
            """Enable translucency of all drawn surfaces for this fieldmap.

            :type: `boolean <bool>`

            This enables translucency controlled by the ``surface_translucency``
            attribute::

                >>> effects = plot.fieldmap(0).effects
                >>> effects.use_translucency = True
                >>> effects.surface_translucency = 50
            """
            return self._get_style(bool, sv.USETRANSLUCENCY)

        @use_translucency.setter
        def use_translucency(self, value):
            self._set_style(bool(value), sv.USETRANSLUCENCY)

        @property
        def surface_translucency(self):
            """Translucency of all drawn surfaces for this fieldmap.

            :type: `integer <int>` in percent

            The ``use_translucency`` attribute must be set to `True`::

                >>> effects = plot.fieldmap(0).effects
                >>> effects.use_translucency = True
                >>> effects.surface_translucency = 50
            """
            return self._get_style(int, sv.SURFACETRANSLUCENCY)

        @surface_translucency.setter
        def surface_translucency(self, value):
            self._set_style(int(value), sv.SURFACETRANSLUCENCY)

    class FieldmapShade(FieldmapStyle):
        """Fill color for displayed surfaces on 2D field plots.

        Although most commonly used with 3D surfaces (see `FieldmapShade3D`), shade
        plots can be used to flood 2D plots with solid colors.

        .. code-block:: python
            :emphasize-lines: 20

            import os
            import random
            import tecplot
            from tecplot.constant import Color, PlotType

            random.seed(1)

            examples_dir = tecplot.session.tecplot_examples_directory()
            datafile = os.path.join(examples_dir, 'SimpleData', 'F18.plt')
            dataset = tecplot.data.load_tecplot(datafile)
            frame = dataset.frame
            frame.plot_type = PlotType.Cartesian2D
            plot = frame.plot()

            for zone in dataset.zones():
                color = Color(random.randint(0,63))
                while color == Color.White:
                    color = Color(random.randint(0,63))
                fmap = plot.fieldmap(zone)
                fmap.shade.color = color

            tecplot.export.save_png('fieldmap_shade2d.png', 600, supersample=3)

        .. figure:: /_static/images/fieldmap_shade2d.png
            :width: 300px
            :figwidth: 300px
        """
        def __init__(self, fieldmap):
            super().__init__(fieldmap, sv.SHADE)

        @property
        def show(self):
            """FieldmapShade the drawn surfaces.

            :type: `bool`

            Example usage::

                >>> plot.fieldmap(0).shade.show = False
            """
            return self._get_style(bool, sv.SHOW)

        @show.setter
        def show(self, value):
            self._set_style(bool(value), sv.SHOW)

        @property
        def color(self):
            """Fill `Color` of the shade.

            :type: `Color`

            Example usage::

                >>> from tecplot.constant import Color
                >>> plot.fieldmap(0).shade.color = Color.Blue
            """
            return self._get_style(Color, sv.COLOR)

        @color.setter
        def color(self, value):
            self._set_style(Color(value), sv.COLOR)

    class FieldmapShade3D(FieldmapShade):
        """Fill color for displayed surfaces on 3D field plots.

        This class inherits all functionality and purpose from `FieldmapShade` and
        adds the ability to turn on or off the lighting effect. In 3D plots,
        fieldmap effects (translucency and lighting) cause color variation
        (shading) throughout the zones. Shading can can be useful in discerning the
        shape of the data:

        .. code-block:: python
            :emphasize-lines: 21-22

            import os
            import random
            import tecplot
            from tecplot.constant import Color, PlotType, SurfacesToPlot

            random.seed(1)

            examples_dir = tecplot.session.tecplot_examples_directory()
            datafile = os.path.join(examples_dir, 'SimpleData', 'F18.plt')
            dataset = tecplot.data.load_tecplot(datafile)
            frame = dataset.frame
            frame.plot_type = PlotType.Cartesian3D
            plot = frame.plot()

            for zone in dataset.zones():
                color = Color(random.randint(0,63))
                while color == Color.White:
                    color = Color(random.randint(0,63))
                fmap = plot.fieldmap(zone)
                fmap.surfaces.surfaces_to_plot = SurfacesToPlot.BoundaryFaces
                fmap.shade.color = color
                fmap.shade.use_lighting_effect = False

            tecplot.export.save_png('fieldmap_shade3d.png', 600, supersample=3)

        .. figure:: /_static/images/fieldmap_shade3d.png
            :width: 300px
            :figwidth: 300px
        """

        @property
        def use_lighting_effect(self):
            """Draw a lighting effect on the shaded surfaces.

            :type: `bool`

            Example usage::

                >>> plot.fieldmap(0).shade.use_lighting_effect = False
            """
            return self._get_style(bool, sv.USELIGHTINGEFFECT)

        @use_lighting_effect.setter
        def use_lighting_effect(self, value):
            self._set_style(bool(value), sv.USELIGHTINGEFFECT)

    class Cartesian2DFieldmap(Fieldmap):
        @property
        def effects(self):
            """`FieldmapEffects` style control for clipping and blanking effects.

            :type: `FieldmapEffects`
            """
            return FieldmapEffects(self)

        @property
        def shade(self):
            """`FieldmapShade` style control for surface shading.

            :type: `FieldmapShade`
            """
            return FieldmapShade(self)

    class Cartesian3DFieldmap(Fieldmap):
        @property
        def effects(self):
            """`FieldmapEffects3D` style control for blanking and lighting effects.

            :type: `FieldmapEffects3D`
            """
            return FieldmapEffects3D(self)

        @property
        def shade(self):
            """`FieldmapShade3D` style control for surface shading.

            :type: `FieldmapShade3D`
            """
            return FieldmapShade3D(self)

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