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110 lines
4.1 KiB
110 lines
4.1 KiB
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//----------------------------------------------------------------------------
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// XYQ: 2006-01-22 Copied from AGG project.
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// TODO: This file uses intensive floating point operations, so it's NOT suitable
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// for platforms like Symbian OS. We need to change to FIX format.
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//----------------------------------------------------------------------------
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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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#include "agg_curves.h"
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#include "agg_math.h"
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namespace agg
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{
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const float curve_collinearity_epsilon = 1e-30f;
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enum curve_recursion_limit_e { curve_recursion_limit = 16 };
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void curve4_div::init(float x1, float y1,
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float x2, float y2,
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float x3, float y3,
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float x4, float y4)
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{
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m_points.remove_all();
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m_distance_tolerance_square = 1.0f / 4;
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m_distance_tolerance_manhattan = 1.0f * 4;
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bezier(x1, y1, x2, y2, x3, y3, x4, y4);
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m_count = 0;
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}
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void curve4_div::recursive_bezier(float x1, float y1,
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float x2, float y2,
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float x3, float y3,
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float x4, float y4,
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unsigned level)
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{
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if(level > curve_recursion_limit) {
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return;
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}
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float x12 = (x1 + x2) / 2;
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float y12 = (y1 + y2) / 2;
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float x23 = (x2 + x3) / 2;
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float y23 = (y2 + y3) / 2;
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float x34 = (x3 + x4) / 2;
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float y34 = (y3 + y4) / 2;
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float x123 = (x12 + x23) / 2;
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float y123 = (y12 + y23) / 2;
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float x234 = (x23 + x34) / 2;
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float y234 = (y23 + y34) / 2;
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float x1234 = (x123 + x234) / 2;
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float y1234 = (y123 + y234) / 2;
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float dx = x4 - x1;
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float dy = y4 - y1;
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float d2 = fabs(((x2 - x4) * dy) - ((y2 - y4) * dx));
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float d3 = fabs(((x3 - x4) * dy) - ((y3 - y4) * dx));
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switch((int(d2 > curve_collinearity_epsilon) << 1) +
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int(d3 > curve_collinearity_epsilon)) {
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case 0:
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if (fabs(x1 + x3 - x2 - x2) + fabs(y1 + y3 - y2 - y2) +
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fabs(x2 + x4 - x3 - x3) + fabs(y2 + y4 - y3 - y3) <=
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m_distance_tolerance_manhattan) {
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m_points.add(point_type(x1234, y1234, path_flags_jr));
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return;
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}
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break;
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case 1:
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if ((d3 * d3) <=
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(m_distance_tolerance_square * ((dx * dx) + (dy * dy)))) {
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m_points.add(point_type(x23, y23, path_flags_jr));
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return;
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}
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break;
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case 2:
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if ((d2 * d2) <=
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(m_distance_tolerance_square * ((dx * dx) + (dy * dy)))) {
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m_points.add(point_type(x23, y23, path_flags_jr));
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return;
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}
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break;
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case 3:
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if (((d2 + d3) * (d2 + d3)) <=
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(m_distance_tolerance_square * ((dx * dx) + (dy * dy)))) {
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m_points.add(point_type(x23, y23, path_flags_jr));
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return;
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}
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break;
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}
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recursive_bezier(x1, y1, x12, y12, x123, y123, x1234, y1234, level + 1);
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recursive_bezier(x1234, y1234, x234, y234, x34, y34, x4, y4, level + 1);
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}
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void curve4_div::bezier(float x1, float y1,
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float x2, float y2,
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float x3, float y3,
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float x4, float y4)
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{
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m_points.add(point_type(x1, y1));
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recursive_bezier(x1, y1, x2, y2, x3, y3, x4, y4, 0);
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m_points.add(point_type(x4, y4));
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}
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}
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