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122 lines
3.9 KiB
C++
122 lines
3.9 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry (AGG) - Version 2.5
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// A high quality rendering engine for C++
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// Copyright (C) 2002-2006 Maxim Shemanarev
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://antigrain.com
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//
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// AGG is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// AGG is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with AGG; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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// MA 02110-1301, USA.
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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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