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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
/**
* @class vtkCGMWriter
* @brief write polygonal data as a CGM file
*
* vtkCGMWriter writes CGM (Computer Graphics Metafile) output. CGM is a 2D
* graphics vector format typically used by large plotters. This writer can
* handle vertices, lines, polygons, and triangle strips in any combination.
* Colors are specified either 1) from cell scalars (assumed to be RGB or
* RGBA color specification), 2) from a specified color; or 3) randomly
* assigned colors.
*
* Note: During output of the polygonal data, triangle strips are converted
* to triangles, and polylines to lines. Also, due to limitations in the CGM
* color model, only 256 colors are available to the color palette.
*
* @warning
* The class vtkImageToPolyDataFilter is convenient for converting a raster
* image into polygons (and color map) suitable for plotting with CGM.
*
* @sa
* vtkPolyDataWriter vtkPointDataToCellData
*/
#ifndef vtkCGMWriter_h
#define vtkCGMWriter_h
#include "vtkIOGeometryModule.h" // For export macro
#include "vtkPolyDataWriter.h"
VTK_ABI_NAMESPACE_BEGIN
class vtkViewport;
#define VTK_COLOR_MODE_DEFAULT 0
#define VTK_COLOR_MODE_SPECIFIED_COLOR 1
#define VTK_COLOR_MODE_RANDOM_COLORS 2
class VTKIOGEOMETRY_EXPORT vtkCGMWriter : public vtkPolyDataWriter
{
public:
/**
* Instantiate with no viewport defined and sorting on. The default
* resolution is 10,000, and the color mode is set to default.
*/
static vtkCGMWriter* New();
vtkTypeMacro(vtkCGMWriter, vtkPolyDataWriter);
void PrintSelf(ostream& os, vtkIndent indent);
///@{
/**
* Specify a vtkViewport object to be used to transform the vtkPolyData
* points into 2D coordinates. By default (no vtkViewport specified), the
* point coordinates are generated by ignoring the z values. If a viewport
* is defined, then the points are transformed into viewport coordinates.
*/
virtual void SetViewport(vtkViewport*);
vtkGetObjectMacro(Viewport, vtkViewport);
///@}
///@{
/**
* Turn on/off the sorting of the cells via depth. If enabled, polygonal
* cells will be sorted from back to front, i.e., a Painter's algorithm
* sort.
*/
vtkSetMacro(Sort, int);
vtkGetMacro(Sort, int);
///@}
///@{
/**
* Specify the resolution of the CGM file. This number is used to integerize
* the maximum coordinate range of the plot file.
*/
vtkSetClampMacro(Resolution, int, 100, VTK_INT_MAX);
vtkGetMacro(Resolution, int);
///@}
///@{
/**
* Control how output polydata is colored. By default (ColorModeToDefault),
* if per cell colors are defined (unsigned chars of 1-4 components), then
* the cells are colored with these values. (If point colors are defined
* and cell colors are not, you can use vtkPointDataToCellData to convert
* the point colors to cell colors.) Otherwise, by default, the cells are
* set to the specified color. If ColorModeToSpecifiedColor is set, then
* the primitives will all be set to this color. If ColorModeToRandomColors
* is set, each cell will be randomly assigned a color.
*/
vtkSetMacro(ColorMode, int);
vtkGetMacro(ColorMode, int);
void SetColorModeToDefault() { this->SetColorMode(VTK_COLOR_MODE_DEFAULT); }
void SetColorModeToSpecifiedColor() { this->SetColorMode(VTK_COLOR_MODE_SPECIFIED_COLOR); }
void SetColorModeToRandomColors() { this->SetColorMode(VTK_COLOR_MODE_RANDOM_COLORS); }
///@}
///@{
/**
* Set/Get the specified color to color the polydata cells. This
* color is only used when the color mode is set to
* ColorModeToSpecifiedColor, or ColorModeToDefault is set and no
* cell colors are specified. The specified color is specified as RGB
* values ranging from (0,1). (Note: CGM will map this color to the
* closest color it supports.)
*/
vtkSetVector3Macro(SpecifiedColor, float);
vtkGetVectorMacro(SpecifiedColor, float, 3);
///@}
protected:
vtkCGMWriter();
~vtkCGMWriter() override;
void WriteData();
vtkViewport* Viewport;
int ColorMode;
float SpecifiedColor[3];
int Resolution;
int Sort;
private:
vtkCGMWriter(const vtkCGMWriter&) = delete;
void operator=(const vtkCGMWriter&) = delete;
};
VTK_ABI_NAMESPACE_END
#endif
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