modules/gui/skins2/src/anchor.cpp

   1 /*****************************************************************************
   2  * anchor.cpp
   3  *****************************************************************************
   4  * Copyright (C) 2003 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Cyril Deguet     <asmax@via.ecp.fr>
   8  *          Olivier Teulière <ipkiss@via.ecp.fr>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 #include "anchor.hpp"
  26
  27
  28 bool Anchor::isHanging( const Anchor &rOther ) const
  29 {
  30     if( m_priority <= rOther.m_priority )
  31         return false;
  32
  33     // Compute delta coordinates between anchors, since the Bezier class
  34     // uses coordinates relative to (0;0)
  35     int deltaX = getXPosAbs() - rOther.getXPosAbs();
  36     int deltaY = getYPosAbs() - rOther.getYPosAbs();
  37
  38     // One of the anchors (at least) must be a point, else it has no meaning
  39     return (isPoint() && rOther.m_rCurve.getMinDist( deltaX, deltaY ) == 0) ||
  40            (rOther.isPoint() && m_rCurve.getMinDist( -deltaX, -deltaY ) == 0);
  41 }
  42
  43
  44 bool Anchor::canHang( const Anchor &rOther, int &xOffset, int &yOffset ) const
  45 {
  46     int deltaX = getXPosAbs() - (rOther.getXPosAbs() + xOffset);
  47     int deltaY = getYPosAbs() - (rOther.getYPosAbs() + yOffset);
  48
  49     // One of the anchors (at least) must be a point, else it has no meaning
  50     if( (isPoint() && rOther.m_rCurve.getMinDist( deltaX, deltaY ) < m_range) )
  51     {
  52         // Compute the coordinates of the nearest point of the curve
  53         int xx, yy;
  54         float p = rOther.m_rCurve.getNearestPercent( deltaX, deltaY );
  55         rOther.m_rCurve.getPoint( p, xx, yy );
  56
  57         xOffset = getXPosAbs() - (rOther.getXPosAbs() + xx);
  58         yOffset = getYPosAbs() - (rOther.getYPosAbs() + yy);
  59         return true;
  60     }
  61     else if( (rOther.isPoint() &&
  62               m_rCurve.getMinDist( -deltaX, -deltaY ) < m_range) )
  63     {
  64         // Compute the coordinates of the nearest point of the curve
  65         int xx, yy;
  66         float p = m_rCurve.getNearestPercent( -deltaX, -deltaY );
  67         m_rCurve.getPoint( p, xx, yy );
  68
  69         xOffset = (getXPosAbs() + xx) - rOther.getXPosAbs();
  70         yOffset = (getYPosAbs() + yy) - rOther.getYPosAbs();
  71         return true;
  72     }
  73     else
  74     {
  75         return false;
  76     }
  77 }