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rect.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-11-1/common/rect.h $
 * $Id: rect.h 30944 2008-02-23 22:50:18Z sev $
 *
 */

#ifndef COMMON_RECT_H
#define COMMON_RECT_H

#include "common/scummsys.h"
#include "common/util.h"

namespace Common {

/*!   @brief simple class for handling both 2D position and size

      This small class is an helper for position and size values.
*/
00038 struct Point {
00039       int16 x;    //!< The horizontal part of the point
00040       int16 y;    //!< The vertical part of the point

      Point() : x(0), y(0) {}
      Point(const Point &p) : x(p.x), y(p.y) {}
      explicit Point(int16 x1, int16 y1) : x(x1), y(y1) {}
      Point & operator=(const Point & p) { x = p.x; y = p.y; return *this; };
      bool operator==(const Point & p) const { return x == p.x && y == p.y; };
      bool operator!=(const Point & p) const { return x != p.x || y != p.y; };

      /**
       * Return the square of the distance between this point and the point p.
       *
       * @param p       the other point
       * @return the distance between this and p
       */
00055       uint sqrDist(const Point & p) const {
            int diffx = ABS(p.x - x);
            if (diffx >= 0x1000)
                  return 0xFFFFFF;

            int diffy = ABS(p.y - y);
            if (diffy >= 0x1000)
                  return 0xFFFFFF;

            return diffx*diffx + diffy*diffy;
      }
};

/*!   @brief simple class for handling a rectangular zone.

      This small class is an helper for rectangles.
      Note: This implementation is built around the assumption that (top,left) is
      part of the rectangle, but (bottom,right) is not! This is reflected in
      various methods, including contains(), intersects() and others.

      Another very wide spread approach to rectangle classes treats (bottom,right)
      also as a part of the rectangle.

      Coneptually, both are sound, but the approach we use saves many intermediate
      computations (like computing the height in our case is done by doing this:
        height = bottom - top;
      while in the alternate system, it would be
        height = bottom - top + 1;

      When writing code using our Rect class, always keep this principle in mind!
*/
00086 struct Rect {
00087       int16 top, left;        //!< The point at the top left of the rectangle (part of the rect).
00088       int16 bottom, right;    //!< The point at the bottom right of the rectangle (not part of the rect).

      Rect() : top(0), left(0), bottom(0), right(0) {}
      Rect(int16 w, int16 h) : top(0), left(0), bottom(h), right(w) {}
      Rect(int16 x1, int16 y1, int16 x2, int16 y2) : top(y1), left(x1), bottom(y2), right(x2) {
            assert(isValidRect());
      }
      int16 width() const { return right - left; }
      int16 height() const { return bottom - top; }

      void setWidth(int16 aWidth) {
            right = left + aWidth;
      }

      void setHeight(int16 aHeight) {
            bottom = top + aHeight;
      }

      /*!   @brief check if given position is inside this rectangle

            @param x the horizontal position to check
            @param y the vertical position to check

            @return true if the given position is inside this rectangle, false otherwise
      */
00113       bool contains(int16 x, int16 y) const {
            return (left <= x) && (x < right) && (top <= y) && (y < bottom);
      }

      /*!   @brief check if given point is inside this rectangle

            @param p the point to check

            @return true if the given point is inside this rectangle, false otherwise
      */
00123       bool contains(const Point &p) const {
            return contains(p.x, p.y);
      }

      /*!   @brief check if given rectangle intersects with this rectangle

            @param r the rectangle to check

            @return true if the given rectangle is inside the rectangle, false otherwise
      */
00133       bool intersects(const Rect &r) const {
            return (left < r.right) && (r.left < right) && (top < r.bottom) && (r.top < bottom);
      }

      /*!   @brief extend this rectangle so that it contains r

            @param r the rectangle to extend by
      */
00141       void extend(const Rect &r) {
            left = MIN(left, r.left);
            right = MAX(right, r.right);
            top = MIN(top, r.top);
            bottom = MAX(bottom, r.bottom);
      }

      /*!   @brief extend this rectangle in all four directions by the given number of pixels

            @param offset the size to grow by
      */
00152       void grow(int16 offset) {
            top -= offset;
            left -= offset;
            bottom += offset;
            right += offset;
      }

      void clip(const Rect &r) {
            assert(isValidRect());
            assert(r.isValidRect());

            if (top < r.top) top = r.top;
            else if (top > r.bottom) top = r.bottom;

            if (left < r.left) left = r.left;
            else if (left > r.right) left = r.right;

            if (bottom > r.bottom) bottom = r.bottom;
            else if (bottom < r.top) bottom = r.top;

            if (right > r.right) right = r.right;
            else if (right < r.left) right = r.left;
      }

      void clip(int maxw, int maxh) {
            clip(Rect(0, 0, maxw, maxh));
      }

      bool isValidRect() const {
            return (left <= right && top <= bottom);
      }

      void moveTo(int16 x, int16 y) {
            bottom += y - top;
            right += x - left;
            top = y;
            left = x;
      }

      void translate(int16 dx, int16 dy) {
            left += dx; right += dx;
            top += dy; bottom += dy;
      }

      void moveTo(const Point &p) {
            moveTo(p.x, p.y);
      }

      void debugPrint(int debuglevel = 0, const char *caption = "Rect:") const {
            debug(debuglevel, "%s %d, %d, %d, %d", caption, left, top, right, bottom);
      }

      /*! @brief create a rectangle around the given center */
00205       static Rect center(int16 cx, int16 cy, int16 w, int16 h) {
            w /= 2;
            h /= 2;
            return Rect(cx - w, cy - h, cx + w, cy + h);
      }
};

}     // End of namespace Common

#endif

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