vtkMRMLAccuratePicker.h

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/*==============================================================================
 
  Program: 3D Slicer
 
  Copyright (c) Kitware Inc.
 
  See COPYRIGHT.txt
  or http://www.slicer.org/copyright/copyright.txt for details.
 
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
 
==============================================================================*/
 
#ifndef vtkMRMLAccuratePicker_h
#define vtkMRMLAccuratePicker_h
 
// MRMLDisplayableManager includes
#include "vtkMRMLDisplayableManagerExport.h"
 
// VTK includes
#include <vtkCellPicker.h>
#include <vtkSmartPointer.h>
 
// STD includes
#include <map>
 
class vtkAbstractCellLocator;
class vtkDataSet;
class vtkRenderer;

class VTK_MRML_DISPLAYABLEMANAGER_EXPORT vtkMRMLAccuratePicker : public vtkCellPicker
{
public:
  static vtkMRMLAccuratePicker* New();
  vtkTypeMacro(vtkMRMLAccuratePicker, vtkCellPicker);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  vtkSetMacro(MinimumCellCountToIndex, vtkIdType);
  vtkGetMacro(MinimumCellCountToIndex, vtkIdType);
 
  using vtkCellPicker::Pick;

  int Pick(double selectionX, double selectionY, double selectionZ, vtkRenderer* renderer) override;
 
protected:
  vtkMRMLAccuratePicker();
  ~vtkMRMLAccuratePicker() override;

  void UpdateLocators(vtkRenderer* renderer);

  double IntersectWithLine(const double p1[3], const double p2[3], double tol, vtkAssemblyPath* path, vtkProp3D* p, vtkAbstractMapper3D* m) override;

  double IntersectActorWithLine(const double p1[3], const double p2[3], double t1, double t2, double tol, vtkProp3D* prop, vtkMapper* mapper) override;

  bool IntersectDataSetWithLine(vtkDataSet* dataSet,
                                const double p1[3],
                                const double p2[3],
                                double t1,
                                double t2,
                                double tol,
                                vtkAbstractCellLocator*& locator,
                                vtkIdType& cellId,
                                int& subId,
                                double& tMin,
                                double& pDistMin,
                                double xyz[3],
                                double minPCoords[3]) override;
 
  struct CachedLocator
  {
    vtkSmartPointer<vtkAbstractCellLocator> Locator;
    vtkMTimeType BuildMTime{ 0 };
  };

  std::map<vtkDataSet*, CachedLocator> LocatorsBySurface;
 
  vtkIdType MinimumCellCountToIndex{ 10000 };
 
private:
  vtkMRMLAccuratePicker(const vtkMRMLAccuratePicker&) = delete;
  void operator=(const vtkMRMLAccuratePicker&) = delete;
};
 
#endif