MatrixInteractorLogic.h

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// ----------------------------------------------------------------------------
// -                        Open3D: www.open3d.org                            -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2023 www.open3d.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------
 
#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);
    int GetViewWidth() const;
    int GetViewHeight() const;
 
    const geometry::AxisAlignedBoundingBox& GetBoundingBox() const;
    virtual void SetBoundingBox(const geometry::AxisAlignedBoundingBox& bounds);
 
    Eigen::Vector3f GetCenterOfRotation() const;
 
    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(float 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(float dy,
                        DragType drag_type,
                        const Camera::Transform& matrix);
};
 
}  // namespace rendering
}  // namespace visualization
}  // namespace open3d