FreeMat

- Main Page
- Related Pages

vtkPolyDataMapper2D

Section: Visualization Toolkit Rendering Classes

# Usage

vtkPolyDataMapper2D is a mapper that renders 3D polygonal data (vtkPolyData) onto the 2D image plane (i.e., the renderer's viewport). By default, the 3D data is transformed into 2D data by ignoring the z-coordinate of the 3D points in vtkPolyData, and taking the x-y values as local display values (i.e., pixel coordinates). Alternatively, you can provide a vtkCoordinate object that will transform the data into local display coordinates (use the vtkCoordinate::SetCoordinateSystem() methods to indicate which coordinate system you are transforming the data from).

To create an instance of class vtkPolyDataMapper2D, simply invoke its constructor as follows

      obj = vtkPolyDataMapper2D

# Methods

The class vtkPolyDataMapper2D has several methods that can be used. They are listed below. Note that the documentation is translated automatically from the VTK sources, and may not be completely intelligible. When in doubt, consult the VTK website. In the methods listed below, `obj` is an instance of the vtkPolyDataMapper2D class.

- `string = obj.GetClassName ()`
- `int = obj.IsA (string name)`
- `vtkPolyDataMapper2D = obj.NewInstance ()`
- `vtkPolyDataMapper2D = obj.SafeDownCast (vtkObject o)`
- `obj.SetInput (vtkPolyData in)` - Set the input to the mapper.
- `vtkPolyData = obj.GetInput ()` - Set the input to the mapper.
- `obj.SetLookupTable (vtkScalarsToColors lut)` - Specify a lookup table for the mapper to use.
- `vtkScalarsToColors = obj.GetLookupTable ()` - Specify a lookup table for the mapper to use.
- `obj.CreateDefaultLookupTable ()` - Create default lookup table. Generally used to create one when none is available with the scalar data.
- `obj.SetScalarVisibility (int )` - Turn on/off flag to control whether scalar data is used to color objects.
- `int = obj.GetScalarVisibility ()` - Turn on/off flag to control whether scalar data is used to color objects.
- `obj.ScalarVisibilityOn ()` - Turn on/off flag to control whether scalar data is used to color objects.
- `obj.ScalarVisibilityOff ()` - Turn on/off flag to control whether scalar data is used to color objects.
- `obj.SetColorMode (int )` - Control how the scalar data is mapped to colors. By default (ColorModeToDefault), unsigned char scalars are treated as colors, and NOT mapped through the lookup table, while everything else is. Setting ColorModeToMapScalars means that all scalar data will be mapped through the lookup table. (Note that for multi-component scalars, the particular component to use for mapping can be specified using the ColorByArrayComponent() method.)
- `int = obj.GetColorMode ()` - Control how the scalar data is mapped to colors. By default (ColorModeToDefault), unsigned char scalars are treated as colors, and NOT mapped through the lookup table, while everything else is. Setting ColorModeToMapScalars means that all scalar data will be mapped through the lookup table. (Note that for multi-component scalars, the particular component to use for mapping can be specified using the ColorByArrayComponent() method.)
- `obj.SetColorModeToDefault ()` - Control how the scalar data is mapped to colors. By default (ColorModeToDefault), unsigned char scalars are treated as colors, and NOT mapped through the lookup table, while everything else is. Setting ColorModeToMapScalars means that all scalar data will be mapped through the lookup table. (Note that for multi-component scalars, the particular component to use for mapping can be specified using the ColorByArrayComponent() method.)
- `obj.SetColorModeToMapScalars ()` - Control how the scalar data is mapped to colors. By default (ColorModeToDefault), unsigned char scalars are treated as colors, and NOT mapped through the lookup table, while everything else is. Setting ColorModeToMapScalars means that all scalar data will be mapped through the lookup table. (Note that for multi-component scalars, the particular component to use for mapping can be specified using the ColorByArrayComponent() method.)
- `string = obj.GetColorModeAsString ()` - Return the method of coloring scalar data.
- `obj.SetUseLookupTableScalarRange (int )` - Control whether the mapper sets the lookuptable range based on its own ScalarRange, or whether it will use the LookupTable ScalarRange regardless of it's own setting. By default the Mapper is allowed to set the LookupTable range, but users who are sharing LookupTables between mappers/actors will probably wish to force the mapper to use the LookupTable unchanged.
- `int = obj.GetUseLookupTableScalarRange ()` - Control whether the mapper sets the lookuptable range based on its own ScalarRange, or whether it will use the LookupTable ScalarRange regardless of it's own setting. By default the Mapper is allowed to set the LookupTable range, but users who are sharing LookupTables between mappers/actors will probably wish to force the mapper to use the LookupTable unchanged.
- `obj.UseLookupTableScalarRangeOn ()` - Control whether the mapper sets the lookuptable range based on its own ScalarRange, or whether it will use the LookupTable ScalarRange regardless of it's own setting. By default the Mapper is allowed to set the LookupTable range, but users who are sharing LookupTables between mappers/actors will probably wish to force the mapper to use the LookupTable unchanged.
- `obj.UseLookupTableScalarRangeOff ()` - Control whether the mapper sets the lookuptable range based on its own ScalarRange, or whether it will use the LookupTable ScalarRange regardless of it's own setting. By default the Mapper is allowed to set the LookupTable range, but users who are sharing LookupTables between mappers/actors will probably wish to force the mapper to use the LookupTable unchanged.
- `obj.SetScalarRange (double , double )` - Specify range in terms of scalar minimum and maximum (smin,smax). These values are used to map scalars into lookup table. Has no effect when UseLookupTableScalarRange is true.
- `obj.SetScalarRange (double a[2])` - Specify range in terms of scalar minimum and maximum (smin,smax). These values are used to map scalars into lookup table. Has no effect when UseLookupTableScalarRange is true.
- `double = obj. GetScalarRange ()` - Specify range in terms of scalar minimum and maximum (smin,smax). These values are used to map scalars into lookup table. Has no effect when UseLookupTableScalarRange is true.
- `obj.SetScalarMode (int )` - Control how the filter works with scalar point data and cell attribute data. By default (ScalarModeToDefault), the filter will use point data, and if no point data is available, then cell data is used. Alternatively you can explicitly set the filter to use point data (ScalarModeToUsePointData) or cell data (ScalarModeToUseCellData). You can also choose to get the scalars from an array in point field data (ScalarModeToUsePointFieldData) or cell field data (ScalarModeToUseCellFieldData). If scalars are coming from a field data array, you must call ColorByArrayComponent before you call GetColors.
- `int = obj.GetScalarMode ()` - Control how the filter works with scalar point data and cell attribute data. By default (ScalarModeToDefault), the filter will use point data, and if no point data is available, then cell data is used. Alternatively you can explicitly set the filter to use point data (ScalarModeToUsePointData) or cell data (ScalarModeToUseCellData). You can also choose to get the scalars from an array in point field data (ScalarModeToUsePointFieldData) or cell field data (ScalarModeToUseCellFieldData). If scalars are coming from a field data array, you must call ColorByArrayComponent before you call GetColors.
- `obj.SetScalarModeToDefault ()` - Control how the filter works with scalar point data and cell attribute data. By default (ScalarModeToDefault), the filter will use point data, and if no point data is available, then cell data is used. Alternatively you can explicitly set the filter to use point data (ScalarModeToUsePointData) or cell data (ScalarModeToUseCellData). You can also choose to get the scalars from an array in point field data (ScalarModeToUsePointFieldData) or cell field data (ScalarModeToUseCellFieldData). If scalars are coming from a field data array, you must call ColorByArrayComponent before you call GetColors.
- `obj.SetScalarModeToUsePointData ()` - Control how the filter works with scalar point data and cell attribute data. By default (ScalarModeToDefault), the filter will use point data, and if no point data is available, then cell data is used. Alternatively you can explicitly set the filter to use point data (ScalarModeToUsePointData) or cell data (ScalarModeToUseCellData). You can also choose to get the scalars from an array in point field data (ScalarModeToUsePointFieldData) or cell field data (ScalarModeToUseCellFieldData). If scalars are coming from a field data array, you must call ColorByArrayComponent before you call GetColors.
- `obj.SetScalarModeToUseCellData ()` - Control how the filter works with scalar point data and cell attribute data. By default (ScalarModeToDefault), the filter will use point data, and if no point data is available, then cell data is used. Alternatively you can explicitly set the filter to use point data (ScalarModeToUsePointData) or cell data (ScalarModeToUseCellData). You can also choose to get the scalars from an array in point field data (ScalarModeToUsePointFieldData) or cell field data (ScalarModeToUseCellFieldData). If scalars are coming from a field data array, you must call ColorByArrayComponent before you call GetColors.
- `obj.SetScalarModeToUsePointFieldData ()` - Control how the filter works with scalar point data and cell attribute data. By default (ScalarModeToDefault), the filter will use point data, and if no point data is available, then cell data is used. Alternatively you can explicitly set the filter to use point data (ScalarModeToUsePointData) or cell data (ScalarModeToUseCellData). You can also choose to get the scalars from an array in point field data (ScalarModeToUsePointFieldData) or cell field data (ScalarModeToUseCellFieldData). If scalars are coming from a field data array, you must call ColorByArrayComponent before you call GetColors.
- `obj.SetScalarModeToUseCellFieldData ()` - Control how the filter works with scalar point data and cell attribute data. By default (ScalarModeToDefault), the filter will use point data, and if no point data is available, then cell data is used. Alternatively you can explicitly set the filter to use point data (ScalarModeToUsePointData) or cell data (ScalarModeToUseCellData). You can also choose to get the scalars from an array in point field data (ScalarModeToUsePointFieldData) or cell field data (ScalarModeToUseCellFieldData). If scalars are coming from a field data array, you must call ColorByArrayComponent before you call GetColors.
- `obj.ColorByArrayComponent (int arrayNum, int component)` - Choose which component of which field data array to color by.
- `obj.ColorByArrayComponent (string arrayName, int component)` - Choose which component of which field data array to color by.
- `string = obj.GetArrayName ()` - Get the array name or number and component to color by.
- `int = obj.GetArrayId ()` - Get the array name or number and component to color by.
- `int = obj.GetArrayAccessMode ()` - Get the array name or number and component to color by.
- `int = obj.GetArrayComponent ()` - Overload standard modified time function. If lookup table is modified, then this object is modified as well.
- `long = obj.GetMTime ()` - Overload standard modified time function. If lookup table is modified, then this object is modified as well.
- `obj.SetTransformCoordinate (vtkCoordinate )` - Specify a vtkCoordinate object to be used to transform the vtkPolyData point coordinates. By default (no vtkCoordinate specified), the point coordinates are taken as local display coordinates.
- `vtkCoordinate = obj.GetTransformCoordinate ()` - Specify a vtkCoordinate object to be used to transform the vtkPolyData point coordinates. By default (no vtkCoordinate specified), the point coordinates are taken as local display coordinates.
- `vtkUnsignedCharArray = obj.MapScalars (double alpha)` - Map the scalars (if there are any scalars and ScalarVisibility is on) through the lookup table, returning an unsigned char RGBA array. This is typically done as part of the rendering process. The alpha parameter allows the blending of the scalars with an additional alpha (typically which comes from a vtkActor, etc.)
- `obj.ShallowCopy (vtkAbstractMapper m)` - Make a shallow copy of this mapper.