ViewControl.h

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// The MIT License (MIT)
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// Copyright (c) 2018 www.open3d.org
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#pragma once

#include <Open3D/Geometry/Geometry.h>
#include <Open3D/Camera/PinholeCameraParameters.h>
#include <Open3D/Visualization/Visualizer/ViewParameters.h>
#include <Open3D/Visualization/Utility/BoundingBox.h>
#include <Open3D/Visualization/Utility/GLHelper.h>

namespace open3d {
namespace visualization {

class ViewControl {
public:
    static const double FIELD_OF_VIEW_MAX;
    static const double FIELD_OF_VIEW_MIN;
    static const double FIELD_OF_VIEW_DEFAULT;
    static const double FIELD_OF_VIEW_STEP;

    static const double ZOOM_DEFAULT;
    static const double ZOOM_MIN;
    static const double ZOOM_MAX;
    static const double ZOOM_STEP;

    static const double ROTATION_RADIAN_PER_PIXEL;

    enum ProjectionType {
        Perspective = 0,
        Orthogonal = 1,
    };

public:
    void SetViewMatrices(
            const Eigen::Matrix4d &model_matrix = Eigen::Matrix4d::Identity());

    bool ConvertToViewParameters(ViewParameters &status) const;
    bool ConvertFromViewParameters(const ViewParameters &status);

    bool ConvertToPinholeCameraParameters(
            camera::PinholeCameraParameters &parameters);
    bool ConvertFromPinholeCameraParameters(
            const camera::PinholeCameraParameters &parameters);

    ProjectionType GetProjectionType() const;
    void SetProjectionParameters();
    virtual void Reset();
    virtual void ChangeFieldOfView(double step);
    virtual void ChangeWindowSize(int width, int height);

    // Function to process scaling
    virtual void Scale(double scale);

    // Function to process rotation
    virtual void Rotate(double x, double y, double xo = 0.0, double yo = 0.0);

    // Function to process translation
    virtual void Translate(double x,
                           double y,
                           double xo = 0.0,
                           double yo = 0.0);

    // Function to process rolling
    virtual void Roll(double x);

    const BoundingBox &GetBoundingBox() const { return bounding_box_; }

    void ResetBoundingBox() { bounding_box_.Reset(); }

    void FitInGeometry(const geometry::Geometry &geometry) {
        if (geometry.Dimension() == 3) {
            bounding_box_.FitInGeometry((const geometry::Geometry3D &)geometry);
        }
        SetProjectionParameters();
    }

    double GetFieldOfView() const { return field_of_view_; }
    GLHelper::GLMatrix4f GetMVPMatrix() const { return MVP_matrix_; }
    GLHelper::GLMatrix4f GetProjectionMatrix() const {
        return projection_matrix_;
    }
    GLHelper::GLMatrix4f GetViewMatrix() const { return view_matrix_; }
    GLHelper::GLMatrix4f GetModelMatrix() const { return model_matrix_; }
    GLHelper::GLVector3f GetEye() const { return eye_.cast<GLfloat>(); }
    GLHelper::GLVector3f GetLookat() const { return lookat_.cast<GLfloat>(); }
    GLHelper::GLVector3f GetUp() const { return up_.cast<GLfloat>(); }
    GLHelper::GLVector3f GetFront() const { return front_.cast<GLfloat>(); }
    GLHelper::GLVector3f GetRight() const { return right_.cast<GLfloat>(); }
    int GetWindowWidth() const { return window_width_; }
    int GetWindowHeight() const { return window_height_; }
    double GetZNear() const { return z_near_; }
    double GetZFar() const { return z_far_; }

protected:
    int window_width_ = 0;
    int window_height_ = 0;
    BoundingBox bounding_box_;
    Eigen::Vector3d eye_;
    Eigen::Vector3d lookat_;
    Eigen::Vector3d up_;
    Eigen::Vector3d front_;
    Eigen::Vector3d right_;
    double distance_;
    double field_of_view_;
    double zoom_;
    double view_ratio_;
    double aspect_;
    double z_near_;
    double z_far_;
    GLHelper::GLMatrix4f projection_matrix_;
    GLHelper::GLMatrix4f view_matrix_;
    GLHelper::GLMatrix4f model_matrix_;
    GLHelper::GLMatrix4f MVP_matrix_;
};

}  // namespace visualization
}  // namespace open3d