117 lines
3.5 KiB
C++
117 lines
3.5 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.4
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// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
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//
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// Permission to copy, use, modify, sell and distribute this software
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// is granted provided this copyright notice appears in all copies.
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// This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//
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//----------------------------------------------------------------------------
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://www.antigrain.com
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//----------------------------------------------------------------------------
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//
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// bounding_rect function template
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//
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//----------------------------------------------------------------------------
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#ifndef AGG_BOUNDING_RECT_INCLUDED
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#define AGG_BOUNDING_RECT_INCLUDED
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#include "agg_basics.h"
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namespace agg
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{
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//-----------------------------------------------------------bounding_rect
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template<class VertexSource, class GetId, class CoordT>
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bool bounding_rect(VertexSource& vs, GetId& gi,
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unsigned start, unsigned num,
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CoordT* x1, CoordT* y1, CoordT* x2, CoordT* y2)
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{
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unsigned i;
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double x;
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double y;
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bool first = true;
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*x1 = CoordT(1);
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*y1 = CoordT(1);
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*x2 = CoordT(0);
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*y2 = CoordT(0);
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for(i = 0; i < num; i++)
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{
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vs.rewind(gi[start + i]);
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unsigned cmd;
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while(!is_stop(cmd = vs.vertex(&x, &y)))
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{
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if(is_vertex(cmd))
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{
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if(first)
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{
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*x1 = CoordT(x);
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*y1 = CoordT(y);
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*x2 = CoordT(x);
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*y2 = CoordT(y);
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first = false;
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}
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else
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{
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if(CoordT(x) < *x1) *x1 = CoordT(x);
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if(CoordT(y) < *y1) *y1 = CoordT(y);
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if(CoordT(x) > *x2) *x2 = CoordT(x);
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if(CoordT(y) > *y2) *y2 = CoordT(y);
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}
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}
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}
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}
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return *x1 <= *x2 && *y1 <= *y2;
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}
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//-----------------------------------------------------bounding_rect_single
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template<class VertexSource, class CoordT>
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bool bounding_rect_single(VertexSource& vs, unsigned path_id,
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CoordT* x1, CoordT* y1, CoordT* x2, CoordT* y2)
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{
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double x;
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double y;
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bool first = true;
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*x1 = CoordT(1);
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*y1 = CoordT(1);
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*x2 = CoordT(0);
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*y2 = CoordT(0);
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vs.rewind(path_id);
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unsigned cmd;
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while(!is_stop(cmd = vs.vertex(&x, &y)))
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{
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if(is_vertex(cmd))
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{
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if(first)
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{
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*x1 = CoordT(x);
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*y1 = CoordT(y);
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*x2 = CoordT(x);
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*y2 = CoordT(y);
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first = false;
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}
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else
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{
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if(CoordT(x) < *x1) *x1 = CoordT(x);
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if(CoordT(y) < *y1) *y1 = CoordT(y);
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if(CoordT(x) > *x2) *x2 = CoordT(x);
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if(CoordT(y) > *y2) *y2 = CoordT(y);
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}
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}
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}
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return *x1 <= *x2 && *y1 <= *y2;
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}
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}
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#endif
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