PhysicsGeometry.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.
 */
#ifndef GF_PHYSICS_GEOMETRY_H
#define GF_PHYSICS_GEOMETRY_H

#include "Circ.h"
#include "Polygon.h"
#include "Rect.h"
#include "Vector.h"
#include "Matrix.h"

namespace gf {
#ifndef DOXYGEN_SHOULD_SKIP_THIS
inline namespace v1 {
#endif

  struct RenderStates;
  class RenderTarget;

  class GF_API PhysicsGeometry {
  public:
    enum class Type {
      Circle, 
      Polygon, 
    };

    PhysicsGeometry(Type type)
    : m_type(type)
    {

    }

    virtual ~PhysicsGeometry();

    Type getType() const {
      return m_type;
    }

    virtual float getArea() const = 0;

    virtual CircF getBoundingCircle() const = 0;

    virtual void renderAt(RenderTarget& target, const RenderStates& states, Vector2f position, float angle) const = 0;

  private:
    Type m_type;
  };

  class GF_API CircleGeometry : public PhysicsGeometry {
  public:
    CircleGeometry(float radius);

    CircleGeometry(CircF circle);

    const CircF& get() const;

    virtual float getArea() const override;
    virtual CircF getBoundingCircle() const override;
    virtual void renderAt(RenderTarget& target, const RenderStates& states, Vector2f position, float angle) const override;

  private:
    CircF m_circle;
  };

  class GF_API PolygonGeometry : public PhysicsGeometry {
  public:
    PolygonGeometry(Polygon polygon);

    PolygonGeometry(Vector2f size);

    PolygonGeometry(RectF rectangle);

    const Polygon& get() const;

    virtual float getArea() const override;
    virtual CircF getBoundingCircle() const override;
    virtual void renderAt(RenderTarget& target, const RenderStates& states, Vector2f position, float angle) const override;

  private:
    void computeBoundingCircle();

  private:
    Polygon m_polygon;
    CircF m_boundingCircle;
  };

#ifndef DOXYGEN_SHOULD_SKIP_THIS
}
#endif
}

#endif // GF_PHYSICS_GEOMETRY_H