canvas/source/tools/surfacerect.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
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  19
  20 #ifndef INCLUDED_CANVAS_SOURCE_TOOLS_SURFACERECT_HXX
  21 #define INCLUDED_CANVAS_SOURCE_TOOLS_SURFACERECT_HXX
  22
  23 #include <basegfx/point/b2ipoint.hxx>
  24 #include <basegfx/vector/b2isize.hxx>
  25
  26 namespace canvas
  27 {
  28
  29     // SurfaceRect
  30
  31
  32     struct SurfaceRect
  33     {
  34         ::basegfx::B2IPoint maPos;
  35         ::basegfx::B2ISize  maSize;
  36         ::basegfx::B2IPoint maBackup;
  37         bool                bEnabled;
  38
  39         explicit SurfaceRect( const ::basegfx::B2ISize &rSize ) :
  40             maPos(),
  41             maSize(rSize),
  42             maBackup(),
  43             bEnabled(true)
  44         {
  45         }
  46
  47         // coordinates contained in this rectangle are
  48         // constrained to the following rules:
  49         // 1) p.x >= pos.x
  50         // 2) p.x <= pos.x+size.x
  51         // 3) p.y >= pos.y
  52         // 4) p.y <= pos.y+size.y
  53         // in other words, 'size' means the number of pixels
  54         // this rectangle encloses plus one. for example with pos[0,0]
  55         // and size[512,512], p[512,512] would return inside.
  56         // a size of [0,0] therefore denotes a one-by-one rectangle.
  57         bool pointInside( sal_Int32 px, sal_Int32 py ) const
  58         {
  59             const sal_Int32 x1(maPos.getX());
  60             const sal_Int32 y1(maPos.getY());
  61             const sal_Int32 x2(maPos.getX()+maSize.getX());
  62             const sal_Int32 y2(maPos.getY()+maSize.getY());
  63             if(px  < x1) return false;
  64             if(px >= x2) return false;
  65             if(py  < y1) return false;
  66             if(py >= y2) return false;
  67             return true;
  68         }
  69
  70         // returns true if the horizontal line intersects the rect.
  71         bool hLineIntersect( sal_Int32 lx1, sal_Int32 lx2, sal_Int32 ly ) const
  72         {
  73             const sal_Int32 x1(maPos.getX());
  74             const sal_Int32 y1(maPos.getY());
  75             const sal_Int32 x2(maPos.getX()+maSize.getX());
  76             const sal_Int32 y2(maPos.getY()+maSize.getY());
  77             if(ly < y1) return false;
  78             if(ly >= y2) return false;
  79             if((lx1 < x1) && (lx2 < x1)) return false;
  80             if((lx1 >= x2) && (lx2 >= x2)) return false;
  81             return true;
  82         }
  83
  84         //! Returns true if the vertical line intersects the rect.
  85         bool vLineIntersect( sal_Int32 lx, sal_Int32 ly1, sal_Int32 ly2 ) const
  86         {
  87             const sal_Int32 x1(maPos.getX());
  88             const sal_Int32 y1(maPos.getY());
  89             const sal_Int32 x2(maPos.getX()+maSize.getX());
  90             const sal_Int32 y2(maPos.getY()+maSize.getY());
  91             if(lx < x1) return false;
  92             if(lx >= x2) return false;
  93             if((ly1 < y1) && (ly2 < y1)) return false;
  94             if((ly1 >= y2) && (ly2 >= y2)) return false;
  95             return true;
  96         }
  97
  98         // returns true if the passed rect intersects this one.
  99         bool intersection( const SurfaceRect& r ) const
 100         {
 101             const sal_Int32 x1(maPos.getX());
 102             const sal_Int32 y1(maPos.getY());
 103             const sal_Int32 x2(maPos.getX()+maSize.getX());
 104             const sal_Int32 y2(maPos.getY()+maSize.getY());
 105             if(r.hLineIntersect(x1,x2,y1)) return true;
 106             if(r.hLineIntersect(x1,x2,y2)) return true;
 107             if(r.vLineIntersect(x1,y1,y2)) return true;
 108             if(r.vLineIntersect(x2,y1,y2)) return true;
 109             return false;
 110         }
 111
 112         bool inside( const SurfaceRect& r ) const
 113         {
 114             const sal_Int32 x1(maPos.getX());
 115             const sal_Int32 y1(maPos.getY());
 116             const sal_Int32 x2(maPos.getX()+maSize.getX());
 117             const sal_Int32 y2(maPos.getY()+maSize.getY());
 118             if(!(r.pointInside(x1,y1))) return false;
 119             if(!(r.pointInside(x2,y1))) return false;
 120             if(!(r.pointInside(x2,y2))) return false;
 121             if(!(r.pointInside(x1,y2))) return false;
 122             return true;
 123         }
 124     };
 125 }
 126
 127 #endif
 128
 129 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */