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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 | /*=========================================================================
Program: Visualization Toolkit
Module: vtkRenderedAreaPicker.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 vtkRenderedAreaPicker - Uses graphics hardware to picks props behind
// a selection rectangle on a viewport.
//
// .SECTION Description
// Like vtkAreaPicker, this class picks all props within a selection area
// on the screen. The difference is in implementation. This class uses
// graphics hardware to perform the test where the other uses software
// bounding box/frustum intersection testing.
//
// This picker is more conservative than vtkAreaPicker. It will reject
// some objects that pass the bounding box test of vtkAreaPicker. This
// will happen, for instance, when picking through a corner of the bounding
// box when the data set does not have any visible geometry in that corner.
#ifndef __vtkRenderedAreaPicker_h
#define __vtkRenderedAreaPicker_h
#include "vtkAreaPicker.h"
class vtkRenderer;
class VTK_RENDERING_EXPORT vtkRenderedAreaPicker : public vtkAreaPicker
{
public:
static vtkRenderedAreaPicker *New();
vtkTypeMacro(vtkRenderedAreaPicker,vtkAreaPicker);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Perform pick operation in volume behind the given screen coordinates.
// Props intersecting the selection frustum will be accessible via GetProp3D.
// GetPlanes returns a vtkImplicitFunciton suitable for vtkExtractGeometry.
virtual int AreaPick(double x0, double y0, double x1, double y1, vtkRenderer *renderer);
protected:
vtkRenderedAreaPicker();
~vtkRenderedAreaPicker();
private:
vtkRenderedAreaPicker(const vtkRenderedAreaPicker&); // Not implemented.
void operator=(const vtkRenderedAreaPicker&); // Not implemented.
};
#endif
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