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GHOST_Rect.cpp

/**
 * $Id: GHOST_Rect.cpp,v 1.3 2002/11/25 09:52:56 mein Exp $
 * ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
 *
 * 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. The Blender
 * Foundation also sells licenses for use in proprietary software under
 * the Blender License.  See http://www.blender.org/BL/ for information
 * about this.
 *
 * 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.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL/BL DUAL LICENSE BLOCK *****
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "GHOST_Rect.h"



00040 void GHOST_Rect::inset(GHOST_TInt32 i)
{
      if (i > 0) {
            // Grow the rectangle
            m_l -= i;
            m_r += i;
            m_t -= i;
            m_b += i;
      }
      else if (i < 0) {
            // Shrink the rectangle, check for insets larger than half the size
            GHOST_TInt32 i2 = i * 2;
            if (getWidth() > i2) {
                  m_l += i;
                  m_r -= i;
            }
            else {
                  m_l = m_l + ((m_r - m_l) / 2);
                  m_r = m_l;
            }
            if (getHeight() > i2) {
                  m_t += i;
                  m_b -= i;
            }
            else {
                  m_t = m_t + ((m_b - m_t) / 2);
                  m_b = m_t;
            }
      }
}


00072 GHOST_TVisibility GHOST_Rect::getVisibility(GHOST_Rect& r) const
{
      bool lt = isInside(r.m_l, r.m_t);
      bool rt = isInside(r.m_r, r.m_t);
      bool lb = isInside(r.m_l, r.m_b);
      bool rb = isInside(r.m_r, r.m_b);
      GHOST_TVisibility v;
      if (lt && rt && lb && rb) {
            // All points inside, rectangle is inside this
            v = GHOST_kFullyVisible;            
      }
      else if (!(lt || rt || lb || rb)) {
            // None of the points inside
            // Check to see whether the rectangle is larger than this one
            if ((r.m_l < m_l) && (r.m_t < m_t) && (r.m_r > m_r) && (r.m_b > m_b)) {
                  v = GHOST_kPartiallyVisible;
            }
            else {
                  v = GHOST_kNotVisible;
            }
      }
      else {
            // Some of the points inside, rectangle is partially inside
            v = GHOST_kPartiallyVisible;
      }
      return v;
}


00101 void GHOST_Rect::setCenter(GHOST_TInt32 cx, GHOST_TInt32 cy)
{
      GHOST_TInt32 offset = cx - (m_l + (m_r - m_l)/2);
      m_l += offset;
      m_r += offset;
      offset = cy - (m_t + (m_b - m_t)/2);
      m_t += offset;
      m_b += offset;
}

00111 void GHOST_Rect::setCenter(GHOST_TInt32 cx, GHOST_TInt32 cy, GHOST_TInt32 w, GHOST_TInt32 h)
{
      long w_2, h_2;
      
      w_2 = w >> 1;
      h_2 = h >> 1;
      m_l = cx - w_2;
      m_t = cy - h_2;
      m_r = m_l + w;
      m_b = m_t + h;
}

00123 bool GHOST_Rect::clip(GHOST_Rect& r) const
{
      bool clipped = false;
      if (r.m_l < m_l) {
            r.m_l = m_l;
            clipped = true;
      }
      if (r.m_t < m_t) {
            r.m_t = m_t;
            clipped = true;
      }
      if (r.m_r > m_r) {
            r.m_r = m_r;
            clipped = true;
      }
      if (r.m_b > m_b) {
            r.m_b = m_b;
            clipped = true;
      }
      return clipped;
}


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