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64 lines
2.2 KiB
64 lines
2.2 KiB
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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 float intersection_epsilon = 1.0e-30f;
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AGG_INLINE float calc_point_location(float x1, float y1,
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float x2, float y2,
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float x, 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 float calc_distance(float x1, float y1, float x2, float y2)
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{
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float dx = x2 - x1;
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float dy = y2 - y1;
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return FXSYS_sqrt2(dx, dy);
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}
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AGG_INLINE float calc_line_point_distance(float x1, float y1,
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float x2, float y2,
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float x, float y)
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{
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float dx = x2 - x1;
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float dy = y2 - y1;
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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(float ax, float ay, float bx, float by,
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float cx, float cy, float dx, float dy,
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float* x, float* y)
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{
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float num = ((ay - cy) * (dx - cx)) - ((ax - cx) * (dy - cy));
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float den = ((bx - ax) * (dy - cy)) - ((by - ay) * (dx - cx));
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if (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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