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/*=========================================================================
Program: Visualization Toolkit
Module: vtkCoincidentTopologyResolutionPainter.h
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
// .NAME vtkCoincidentTopologyResolutionPainter - painter that resolves
// conicident topology.
// .SECTION Description
// Provides the ability to shift the z-buffer to resolve coincident topology.
// For example, if you'd like to draw a mesh with some edges a different color,
// and the edges lie on the mesh, this feature can be useful to get nice
// looking lines.
#ifndef vtkCoincidentTopologyResolutionPainter_h
#define vtkCoincidentTopologyResolutionPainter_h
#include "vtkRenderingOpenGLModule.h" // For export macro
#include "vtkPolyDataPainter.h"
class vtkInformationIntegerKey;
class vtkInformationDoubleKey;
class vtkInformationDoubleVectorKey;
class VTKRENDERINGOPENGL_EXPORT vtkCoincidentTopologyResolutionPainter :
public vtkPolyDataPainter
{
public:
static vtkCoincidentTopologyResolutionPainter* New();
vtkTypeMacro(vtkCoincidentTopologyResolutionPainter,
vtkPolyDataPainter);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Set/Get a global flag that controls whether coincident topology (e.g., a
// line on top of a polygon) is shifted to avoid z-buffer resolution (and
// hence rendering problems). If not off, there are two methods to choose
// from. PolygonOffset uses graphics systems calls to shift polygons, but
// does not distinguish vertices and lines from one another. ShiftZBuffer
// remaps the z-buffer to distinguish vertices, lines, and polygons, but
// does not always produce acceptable results. If you use the ShiftZBuffer
// approach, you may also want to set the ResolveCoincidentTopologyZShift
// value. (Note: not all mappers/graphics systems implement this
// functionality.)
static vtkInformationIntegerKey* RESOLVE_COINCIDENT_TOPOLOGY();
// Description:
// Used to set the z-shift if ResolveCoincidentTopology is set to
// ShiftZBuffer.
static vtkInformationDoubleKey* Z_SHIFT();
// Description:
// Used to set the polygon offset scale factor and units. Used when
// ResolveCoincidentTopology is set to PolygonOffset.
static vtkInformationDoubleVectorKey* POLYGON_OFFSET_PARAMETERS();
// Description:
// When set and when RESOLVE_COINCIDENT_TOPOLOGY is set to use polygon offset,
// solid polygonal faces will be offsetted, otherwise lines/vertices will be
// offsetted.
static vtkInformationIntegerKey* POLYGON_OFFSET_FACES();
protected:
vtkCoincidentTopologyResolutionPainter();
~vtkCoincidentTopologyResolutionPainter();
// Description:
// Called before RenderInternal() if the Information has been changed
// since the last time this method was called.
virtual void ProcessInformation(vtkInformation*);
// These are method to set ivars. These are purpisefully protected.
// The only means to affect these values is thru information object.
vtkSetMacro(ResolveCoincidentTopology, int);
vtkSetMacro(ZShift, double);
vtkSetMacro(OffsetFaces, int);
void SetPolygonOffsetParameters(double factor, double units)
{
if (this->PolygonOffsetFactor != factor ||
this->PolygonOffsetUnits != units)
{
this->PolygonOffsetFactor = factor;
this->PolygonOffsetUnits = units;
this->Modified();
}
}
int ResolveCoincidentTopology;
double PolygonOffsetFactor;
double PolygonOffsetUnits;
double ZShift;
int OffsetFaces;
private:
vtkCoincidentTopologyResolutionPainter(const vtkCoincidentTopologyResolutionPainter&); // Not implemented.
void operator=(const vtkCoincidentTopologyResolutionPainter&); // Not implemented.
};
#endif
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