View.h

/*
 * Gamedev Framework (gf)
 * Copyright (C) 2016-2018 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 "Matrix.h"
#include "Portability.h"
#include "Rect.h"
#include "Vector.h"

namespace gf {
#ifndef DOXYGEN_SHOULD_SKIP_THIS
inline namespace v1 {
#endif
  struct Event;
  class RenderTarget;

  class GF_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_API AdaptativeView : public View {
  public:
    AdaptativeView()
    : View()
    {

    }

    explicit AdaptativeView(const RectF& rect)
    : View(rect)
    {

    }

    AdaptativeView(Vector2f center, Vector2f size)
    : View(center, size)
    {

    }

    void setInitialScreenSize(Vector2u screenSize);

    virtual void onScreenSizeChange(Vector2u screenSize) = 0;

  };

  class GF_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