1//---------------------------------------------------------------------------- 2// Anti-Grain Geometry - Version 2.4 3// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com) 4// 5// Permission to copy, use, modify, sell and distribute this software 6// is granted provided this copyright notice appears in all copies. 7// This software is provided "as is" without express or implied 8// warranty, and with no claim as to its suitability for any purpose. 9// 10//---------------------------------------------------------------------------- 11// Contact: mcseem@antigrain.com 12// mcseemagg@yahoo.com 13// http://www.antigrain.com 14//---------------------------------------------------------------------------- 15 16#include <math.h> 17#include "agg_vpgen_segmentator.h" 18 19namespace agg 20{ 21 22 void vpgen_segmentator::move_to(double x, double y) 23 { 24 m_x1 = x; 25 m_y1 = y; 26 m_dx = 0.0; 27 m_dy = 0.0; 28 m_dl = 2.0; 29 m_ddl = 2.0; 30 m_cmd = path_cmd_move_to; 31 } 32 33 void vpgen_segmentator::line_to(double x, double y) 34 { 35 m_x1 += m_dx; 36 m_y1 += m_dy; 37 m_dx = x - m_x1; 38 m_dy = y - m_y1; 39 double len = sqrt(m_dx * m_dx + m_dy * m_dy) * m_approximation_scale; 40 if(len < 1e-30) len = 1e-30; 41 m_ddl = 1.0 / len; 42 m_dl = (m_cmd == path_cmd_move_to) ? 0.0 : m_ddl; 43 if(m_cmd == path_cmd_stop) m_cmd = path_cmd_line_to; 44 } 45 46 unsigned vpgen_segmentator::vertex(double* x, double* y) 47 { 48 if(m_cmd == path_cmd_stop) return path_cmd_stop; 49 50 unsigned cmd = m_cmd; 51 m_cmd = path_cmd_line_to; 52 if(m_dl >= 1.0 - m_ddl) 53 { 54 m_dl = 1.0; 55 m_cmd = path_cmd_stop; 56 *x = m_x1 + m_dx; 57 *y = m_y1 + m_dy; 58 return cmd; 59 } 60 *x = m_x1 + m_dx * m_dl; 61 *y = m_y1 + m_dy * m_dl; 62 m_dl += m_ddl; 63 return cmd; 64 } 65 66} 67 68