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//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.3
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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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// Bessel function (besj) was adapted for use in AGG library by Andy Wilk
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// Contact: castor.vulgaris@gmail.com
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//----------------------------------------------------------------------------
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#ifndef AGG_MATH_INCLUDED
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#define AGG_MATH_INCLUDED
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#include "agg_basics.h"
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namespace agg
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{
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const FX_FLOAT intersection_epsilon = 1.0e-30f;
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AGG_INLINE FX_FLOAT calc_point_location(FX_FLOAT x1, FX_FLOAT y1,
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FX_FLOAT x2, FX_FLOAT y2,
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FX_FLOAT x, FX_FLOAT y)
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{
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return ((x - x2) * (y2 - y1)) - ((y - y2) * (x2 - x1));
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}
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AGG_INLINE FX_FLOAT calc_distance(FX_FLOAT x1, FX_FLOAT y1, FX_FLOAT x2, FX_FLOAT y2)
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{
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FX_FLOAT dx = x2 - x1;
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FX_FLOAT dy = y2 - y1;
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return FXSYS_sqrt2(dx, dy);
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}
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AGG_INLINE FX_FLOAT calc_line_point_distance(FX_FLOAT x1, FX_FLOAT y1,
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FX_FLOAT x2, FX_FLOAT y2,
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FX_FLOAT x, FX_FLOAT y)
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{
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FX_FLOAT dx = x2 - x1;
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FX_FLOAT dy = y2 - y1;
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FX_FLOAT d = FXSYS_sqrt2(dx, dy);
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if(d < intersection_epsilon) {
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return calc_distance(x1, y1, x, y);
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}
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return ((x - x2) * dy / d) - ((y - y2) * dx / d);
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}
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AGG_INLINE bool calc_intersection(FX_FLOAT ax, FX_FLOAT ay, FX_FLOAT bx, FX_FLOAT by,
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FX_FLOAT cx, FX_FLOAT cy, FX_FLOAT dx, FX_FLOAT dy,
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FX_FLOAT* x, FX_FLOAT* y)
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{
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FX_FLOAT num = ((ay - cy) * (dx - cx)) - ((ax - cx) * (dy - cy));
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FX_FLOAT den = ((bx - ax) * (dy - cy)) - ((by - ay) * (dx - cx));
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if (FXSYS_fabs(den) < intersection_epsilon) {
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return false;
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}
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*x = ax + ((bx - ax) * num / den);
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*y = ay + ((by - ay) * num / den);
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return true;
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}
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}
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#endif
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