MatrixInteractorLogic.h

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// The MIT License (MIT)
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#pragma once

#include "open3d/geometry/BoundingVolume.h"
#include "open3d/visualization/rendering/Camera.h"

namespace open3d {
namespace visualization {
namespace rendering {

class MatrixInteractorLogic {
public:
    virtual ~MatrixInteractorLogic();

    void SetViewSize(int width, int height);

    const geometry::AxisAlignedBoundingBox& GetBoundingBox() const;
    virtual void SetBoundingBox(const geometry::AxisAlignedBoundingBox& bounds);

    void SetMouseDownInfo(const Camera::Transform& matrix,
                          const Eigen::Vector3f& center_of_rotation);

    const Camera::Transform& GetMatrix() const;

    virtual void Rotate(int dx, int dy);

    virtual void RotateWorld(int dx,
                             int dy,
                             const Eigen::Vector3f& x_axis,
                             const Eigen::Vector3f& y_axis);

    virtual void RotateZ(int dx, int dy);

    virtual void RotateZWorld(int dx, int dy, const Eigen::Vector3f& forward);

    enum class DragType { MOUSE, WHEEL, TWO_FINGER };

    virtual void Dolly(int dy, DragType drag_type);
    virtual void Dolly(float z_dist, Camera::Transform matrix);

private:
    Camera::Transform matrix_;

protected:
    int view_width_ = 1;
    int view_height_ = 1;
    double model_size_ = 20.0;
    geometry::AxisAlignedBoundingBox model_bounds_;
    Eigen::Vector3f center_of_rotation_;

    Camera::Transform matrix_at_mouse_down_;
    Eigen::Vector3f center_of_rotation_at_mouse_down_;

    void SetMatrix(const Camera::Transform& matrix);
    float CalcRotateRadians(int dx, int dy);
    float CalcRotateZRadians(int dx, int dy);
    float CalcDollyDist(int dy, DragType drag_type);
};

}  // namespace rendering
}  // namespace visualization
}  // namespace open3d