View.h

/*
 * Gamedev Framework (gf)
 * Copyright (C) 2016-2022 Julien Bernard
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 *
 * Part of this file comes from SFML, with the same license:
 * Copyright (C) 2007-2015 Laurent Gomila (laurent@sfml-dev.org)
 */
#ifndef GF_VIEW_H
#define GF_VIEW_H
 
#include "GraphicsApi.h"
#include "Matrix.h"
#include "Rect.h"
#include "Vector.h"
 
namespace gf {
#ifndef DOXYGEN_SHOULD_SKIP_THIS
inline namespace v1 {
#endif
  struct Event;
  class RenderTarget;
 
  class GF_GRAPHICS_API View {
  public:
    View();
 
    explicit View(const RectF& rect);
 
    View(Vector2f center, Vector2f size);
 
    virtual ~View();
 
    RectF getBounds() const;
 
    void setCenter(Vector2f center) {
      m_center = center;
    }
 
    Vector2f getCenter() const {
      return m_center;
    }
 
    void setSize(Vector2f size) {
      m_size = size;
      onSizeChange(m_size);
    }
 
    Vector2f getSize() const {
      return m_size;
    }
 
    void setRotation(float angle) {
      m_rotation = angle;
    }
 
    float getRotation() const {
      return m_rotation;
    }
 
    void setViewport(const RectF& viewport);
 
    const RectF& getViewport() const {
      return m_viewport;
    }
 
    void reset(const RectF& rect);
 
    void move(Vector2f offset);
 
    void rotate(float angle);
 
    void zoom(float factor);
 
    void zoom(float factor, Vector2f fixed);
 
    Matrix3f getTransform() const;
 
    Matrix3f getInverseTransform() const;
 
  protected:
    void setSizeNoCallback(Vector2f size) {
      m_size = size;
    }
 
    virtual void onSizeChange(Vector2f size);
 
    void setViewportNoCallback(const RectF& viewport);
 
    virtual void onViewportChange(const RectF& viewport);
 
  private:
    Vector2f m_center;
    Vector2f m_size;
    float m_rotation;
    RectF m_viewport;
  };
 
 
  class GF_GRAPHICS_API AdaptativeView : public View {
  public:
    AdaptativeView()
    : View()
    {
 
    }
 
    explicit AdaptativeView(const RectF& rect)
    : View(rect)
    {
 
    }
 
    AdaptativeView(Vector2f center, Vector2f size)
    : View(center, size)
    {
 
    }
 
    void setInitialFramebufferSize(Vector2i framebufferSize);
 
    [[deprecated("You should use setInitialFramebufferSize() instead")]]
    void setInitialScreenSize(Vector2i screenSize) {
      setInitialFramebufferSize(screenSize);
    }
 
    virtual void onFramebufferSizeChange(Vector2i framebufferSize) = 0;
 
  };
 
  class GF_GRAPHICS_API ZoomingViewAdaptor {
  public:
    ZoomingViewAdaptor(const RenderTarget& target, View& view);
 
    void processEvent(const Event& event);
 
  private:
    const RenderTarget& m_target;
    View& m_view;
    Vector2i m_mousePosition;
 
    enum class State {
      Stationary,
      Moving,
    };
 
    State m_state;
  };
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
}
#endif
}
 
#endif // GF_VIEW_H