drawable_trackball.h

/*****************************************************************************
 * VCLib                                                                     *
 * Visual Computing Library                                                  *
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 * Copyright(C) 2021-2026                                                    *
 * Visual Computing Lab                                                      *
 * ISTI - Italian National Research Council                                  *
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 * it under the terms of the Mozilla Public License Version 2.0 as published *
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 * This program is distributed in the hope that it will be useful,           *
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the              *
 * Mozilla Public License Version 2.0                                        *
 * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
 ****************************************************************************/
 
#ifndef VCL_BGFX_DRAWABLE_DRAWABLE_TRACKBALL_H
#define VCL_BGFX_DRAWABLE_DRAWABLE_TRACKBALL_H
 
#include <vclib/algorithms/core.h>
#include <vclib/bgfx/buffers.h>
#include <vclib/render/drawable/drawable_object.h>
#include <vclib/space/core.h>
 
namespace vcl {
class DrawableTrackBall : public DrawableObject
{
    bool mVisible = true;
 
    VertexBuffer mVertexPosColorBuffer;
    IndexBuffer  mEdgeIndexBuffer;
 
    vcl::Matrix44f mTransform  = vcl::Matrix44f::Identity();
    bool           mIsDragging = false;
 
public:
    DrawableTrackBall();
 
    DrawableTrackBall(const DrawableTrackBall& other);
 
    // default move constructor - buffers can be moved
    DrawableTrackBall(DrawableTrackBall&& other) = default;
 
    // default destructor - buffers are destroyed by their destructor
    ~DrawableTrackBall() = default;
 
    void swap(DrawableTrackBall& other);
 
    friend void swap(DrawableTrackBall& a, DrawableTrackBall& b) { a.swap(b); }
 
    void updateDragging(bool isDragging);
 
    void setTransform(const vcl::Matrix44f& mtx);
 
    // copy and swap idiom
    DrawableTrackBall& operator=(DrawableTrackBall other);
 
    // DrawableObject interface
 
    void draw(const DrawObjectSettings& settings) const override;
 
    Box3d boundingBox() const override;
 
    std::shared_ptr<DrawableObject> clone() const& override;
 
    std::shared_ptr<DrawableObject> clone() && override;
 
    bool isVisible() const override;
 
    void setVisibility(bool vis) override;
 
private:
    void createBuffers();
};
 
} // namespace vcl
 
#endif // VCL_BGFX_DRAWABLE_DRAWABLE_TRACKBALL_H