/*
Copyright (C) 2005 Matthias Braun <matze@braunis.de>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

/**
 * @author Matthias Braun
 * @file Rect2D.hpp
 */

#ifndef __RECTANGLE_H__
#define __RECTANGLE_H__

#include <assert.h>
#include "Vector2.hpp"

/**
 * @class Rect2D
 * @brief This class represents a rectangle.
 * @note Implementation Note: We're using upper left and lower right point
 * instead of upper left and width/height here, because that makes the
 * collision dectection a little bit more efficient.
 */
class Rect2D {
public:
  Rect2D()
  { }

  Rect2D(const Vector2& np1, const Vector2& np2)
    : p1(np1), p2(np2)
  {
  }

  Rect2D(float x1, float y1, float x2, float y2)
    : p1(x1, y1), p2(x2, y2)
  {
    assert(p1.x <= p2.x && p1.y <= p2.y);
  }

  float getWidth() const
  { return p2.x - p1.x; }

  float getHeight() const
  { return p2.y - p1.y; }

  Vector2 getMiddle() const
  { return Vector2((p1.x+p2.x)/2, (p1.y+p2.y)/2); }

  void setPos(const Vector2& v)
  {
    move(v-p1);
  }

  void setHeight(float height)
  {
    p2.y = p1.y + height;
  }
  void setWidth(float width)
  {
    p2.x = p1.x + width;
  }
  void setSize(float width, float height)
  {
    setWidth(width);
    setHeight(height);
  }

  Rect2D &move(const Vector2& v)
  {
    p1 += v;
    p2 += v;
    return *this;
  }

  bool inside(const Vector2& v) const
  {
    return v.x >= p1.x && v.y >= p1.y && v.x < p2.x && v.y < p2.y;
  }
  bool overlap(const Rect2D& other) const
  {
    if(p1.x >= other.p2.x || other.p1.x >= p2.x)
      return false;
    if(p1.y >= other.p2.y || other.p1.y >= p2.y)
      return false;

    return true;
  }

  void join(const Rect2D& other);

  /* leave these 2 vars public to safe the headaches of set/get functions
   * for such simple things :)
   */
  /// upper left edge
  Vector2 p1;
  /// lower right edge
  Vector2 p2;
};

#endif

/** @file gui/Rect2D.hpp */
