dox/Rendering/vtkAreaPicker.h

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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkAreaPicker.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.

=========================================================================*/
#ifndef __vtkAreaPicker_h
#define __vtkAreaPicker_h

#include "vtkAbstractPropPicker.h"

class vtkRenderer;
class vtkPoints;
class vtkPlanes;
class vtkProp3DCollection;
class vtkAbstractMapper3D;
class vtkDataSet;
class vtkExtractSelectedFrustum;
class vtkProp;

class VTK_RENDERING_EXPORT vtkAreaPicker : public vtkAbstractPropPicker
{
public:
  static vtkAreaPicker *New();
  vtkTypeMacro(vtkAreaPicker,vtkAbstractPropPicker);
  void PrintSelf(ostream& os, vtkIndent indent);

  void SetPickCoords(double x0, double y0, double x1, double y1);
  
  void SetRenderer(vtkRenderer *);

  virtual int Pick();

  virtual int AreaPick(double x0, double y0, double x1, double y1, vtkRenderer *renderer = NULL);


  virtual int Pick(double x0, double y0, double vtkNotUsed(z0), vtkRenderer *renderer = NULL)
    {return this->AreaPick(x0, y0, x0+1.0, y0+1.0, renderer);};


  vtkGetObjectMacro(Mapper,vtkAbstractMapper3D);


  vtkGetObjectMacro(DataSet,vtkDataSet);

  vtkProp3DCollection *GetProp3Ds() {return this->Prop3Ds;};


  vtkGetObjectMacro(Frustum, vtkPlanes);


  vtkGetObjectMacro(ClipPoints, vtkPoints);

protected:
  vtkAreaPicker();
  ~vtkAreaPicker();

  virtual void Initialize();
  void DefineFrustum(double x0, double y0, double x1, double y1, vtkRenderer *renderer);
  virtual int PickProps(vtkRenderer *renderer);  
  int TypeDecipher(vtkProp *, vtkAbstractMapper3D **);

  int ABoxFrustumIsect(double bounds[], double &mindist);

  vtkPoints *ClipPoints;
  vtkPlanes *Frustum;

  vtkProp3DCollection *Prop3Ds; //candidate actors (based on bounding box)
  vtkAbstractMapper3D *Mapper; //selected mapper (if the prop has a mapper)
  vtkDataSet *DataSet; //selected dataset (if there is one)

  //used internally to do prop intersection tests
  vtkExtractSelectedFrustum *FrustumExtractor;

  double X0;
  double Y0;
  double X1;
  double Y1;

private:
  vtkAreaPicker(const vtkAreaPicker&);  // Not implemented.
  void operator=(const vtkAreaPicker&);  // Not implemented.
};

#endif