vtkTransferFunctionBoxItem.h

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// SPDX-FileCopyrightText: Copyright (c) Kitware Inc.
// SPDX-License-Identifier: BSD-3-Clause
#ifndef vtkTransferFunctionBoxItem_h
#define vtkTransferFunctionBoxItem_h

#include "vtkControlPointsItem.h"

#include "vtkRemotingViewsModule.h" // needed for export macro

// STL includes
#include <memory> // needed for unique_ptr

// Forward declarations
class vtkImageData;
class vtkTransferFunctionBoxItemInternals;
class vtkPVTransferFunction2DBox;

class VTKREMOTINGVIEWS_EXPORT vtkTransferFunctionBoxItem : public vtkControlPointsItem
{
public:
  static vtkTransferFunctionBoxItem* New();
  vtkTypeMacro(vtkTransferFunctionBoxItem, vtkControlPointsItem);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  // Events fires by this class (and subclasses).
  // \li BoxAddEvent is fired when this box item is added to a chart.
  // \li BoxEditEvent is fired when this box item is edited, either by dragging the whole box or
  // editing the corner points.
  enum
  {
    BoxAddEvent = vtkCommand::UserEvent + 100,
    BoxEditEvent,
    BoxSelectEvent,
    BoxDeleteEvent
  };

  const vtkRectd& GetBox();

  void SetBox(double x, double y, double width, double height);

  vtkSmartPointer<vtkImageData> GetTexture() const;

  /*
   * Override to rescale box corners when the valid bounds have changed.
   */
  void SetValidBounds(double x0, double x1, double y0, double y1) override;


  vtkSetMacro(Selected, bool);
  vtkGetMacro(Selected, bool);
  vtkBooleanMacro(Selected, bool);


  virtual void SetBoxColor(double r, double g, double b, double a);
  virtual void SetBoxColor(const double c[4]) { this->SetBoxColor(c[0], c[1], c[2], c[3]); }
  double* GetBoxColor() VTK_SIZEHINT(4);
  virtual void GetBoxColor(double& r, double& g, double& b, double& a);
  virtual void GetBoxColor(double c[4]) { this->GetBoxColor(c[0], c[1], c[2], c[3]); }


  void SetTransferFunctionBox(vtkPVTransferFunction2DBox* b);
  vtkPVTransferFunction2DBox* GetTransferFunctionBox();


  vtkSetMacro(ID, int);
  vtkGetMacro(ID, int);

protected:
  vtkTransferFunctionBoxItem();
  ~vtkTransferFunctionBoxItem() override;

  vtkIdType AddPoint(double x, double y);
  vtkIdType AddPoint(double* pos) override;

  enum BoxCorners
  {
    BOTTOM_LEFT = 0,
    BOTTOM_RIGHT,
    TOP_RIGHT,
    TOP_LEFT,
    BOTTOM_LEFT_LOOP
  };

  vtkIdType RemovePoint(double* pos) override;

  vtkIdType GetNumberOfPoints() const override;

  void GetControlPoint(vtkIdType index, double* point) const override;

  vtkMTimeType GetControlPointsMTime() override;

  void SetControlPoint(vtkIdType index, double* point) override;

  void emitEvent(unsigned long event, void* params = nullptr) override;

  void MovePoint(vtkIdType pointId, double deltaX, double deltaY);

  void DragBox(double deltaX, double deltaY);

  void DragCorner(vtkIdType cornerId, const double* delta);

  bool Paint(vtkContext2D* painter) override;

  bool Hit(const vtkContextMouseEvent& mouse) override;


  bool MouseButtonPressEvent(const vtkContextMouseEvent& mouse) override;
  bool MouseButtonReleaseEvent(const vtkContextMouseEvent& mouse) override;
  bool MouseDoubleClickEvent(const vtkContextMouseEvent& mouse) override;
  bool MouseMoveEvent(const vtkContextMouseEvent& mouse) override;
  bool KeyPressEvent(const vtkContextKeyEvent& key) override;
  bool KeyReleaseEvent(const vtkContextKeyEvent& key) override;

  virtual void SelectBox();

private:
  void ClampToValidPosition(double pos[2]);

  void UpdateBoxPoints();

  bool ArePointsCrossing(vtkIdType pointA, const double* deltaA, vtkIdType pointB);

  bool BoxIsWithinBounds(double deltaX, double deltaY);

  vtkIdType FindBoxPoint(double* _pos);

  // Helper members
  std::unique_ptr<vtkTransferFunctionBoxItemInternals> Internals;

  bool Initialized = false;
  bool Selected = false;
  int ID = -1;
};

#endif // vtkTransferFunctionBoxItem_h