//---------------------------------------------------------------------------- // Anti-Grain Geometry (AGG) - Version 2.5 // A high quality rendering engine for C++ // Copyright (C) 2002-2006 Maxim Shemanarev // Contact: mcseem@antigrain.com // mcseemagg@yahoo.com // http://antigrain.com // // AGG is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public License // as published by the Free Software Foundation; either version 2 // of the License, or (at your option) any later version. // // AGG is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with AGG; if not, write to the Free Software // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, // MA 02110-1301, USA. //---------------------------------------------------------------------------- #include <math.h> #include "agg_rounded_rect.h" namespace agg { //------------------------------------------------------------------------ rounded_rect::rounded_rect(double x1, double y1, double x2, double y2, double r) : m_x1(x1), m_y1(y1), m_x2(x2), m_y2(y2), m_rx1(r), m_ry1(r), m_rx2(r), m_ry2(r), m_rx3(r), m_ry3(r), m_rx4(r), m_ry4(r) { if(x1 > x2) { m_x1 = x2; m_x2 = x1; } if(y1 > y2) { m_y1 = y2; m_y2 = y1; } } //-------------------------------------------------------------------- void rounded_rect::rect(double x1, double y1, double x2, double y2) { m_x1 = x1; m_y1 = y1; m_x2 = x2; m_y2 = y2; if(x1 > x2) { m_x1 = x2; m_x2 = x1; } if(y1 > y2) { m_y1 = y2; m_y2 = y1; } } //-------------------------------------------------------------------- void rounded_rect::radius(double r) { m_rx1 = m_ry1 = m_rx2 = m_ry2 = m_rx3 = m_ry3 = m_rx4 = m_ry4 = r; } //-------------------------------------------------------------------- void rounded_rect::radius(double rx, double ry) { m_rx1 = m_rx2 = m_rx3 = m_rx4 = rx; m_ry1 = m_ry2 = m_ry3 = m_ry4 = ry; } //-------------------------------------------------------------------- void rounded_rect::radius(double rx_bottom, double ry_bottom, double rx_top, double ry_top) { m_rx1 = m_rx2 = rx_bottom; m_rx3 = m_rx4 = rx_top; m_ry1 = m_ry2 = ry_bottom; m_ry3 = m_ry4 = ry_top; } //-------------------------------------------------------------------- void rounded_rect::radius(double rx1, double ry1, double rx2, double ry2, double rx3, double ry3, double rx4, double ry4) { m_rx1 = rx1; m_ry1 = ry1; m_rx2 = rx2; m_ry2 = ry2; m_rx3 = rx3; m_ry3 = ry3; m_rx4 = rx4; m_ry4 = ry4; } //-------------------------------------------------------------------- void rounded_rect::normalize_radius() { double dx = fabs(m_x2 - m_x1); double dy = fabs(m_y2 - m_y1); double k = 1.0; double t; t = dx / (m_rx1 + m_rx2); if(t < k) k = t; t = dx / (m_rx3 + m_rx4); if(t < k) k = t; t = dy / (m_ry1 + m_ry2); if(t < k) k = t; t = dy / (m_ry3 + m_ry4); if(t < k) k = t; if(k < 1.0) { m_rx1 *= k; m_ry1 *= k; m_rx2 *= k; m_ry2 *= k; m_rx3 *= k; m_ry3 *= k; m_rx4 *= k; m_ry4 *= k; } } //-------------------------------------------------------------------- void rounded_rect::rewind(unsigned) { m_status = 0; } //-------------------------------------------------------------------- unsigned rounded_rect::vertex(double* x, double* y) { unsigned cmd = path_cmd_stop; switch(m_status) { case 0: m_arc.init(m_x1 + m_rx1, m_y1 + m_ry1, m_rx1, m_ry1, pi, pi+pi*0.5); m_arc.rewind(0); m_status++; case 1: cmd = m_arc.vertex(x, y); if(is_stop(cmd)) m_status++; else return cmd; case 2: m_arc.init(m_x2 - m_rx2, m_y1 + m_ry2, m_rx2, m_ry2, pi+pi*0.5, 0.0); m_arc.rewind(0); m_status++; case 3: cmd = m_arc.vertex(x, y); if(is_stop(cmd)) m_status++; else return path_cmd_line_to; case 4: m_arc.init(m_x2 - m_rx3, m_y2 - m_ry3, m_rx3, m_ry3, 0.0, pi*0.5); m_arc.rewind(0); m_status++; case 5: cmd = m_arc.vertex(x, y); if(is_stop(cmd)) m_status++; else return path_cmd_line_to; case 6: m_arc.init(m_x1 + m_rx4, m_y2 - m_ry4, m_rx4, m_ry4, pi*0.5, pi); m_arc.rewind(0); m_status++; case 7: cmd = m_arc.vertex(x, y); if(is_stop(cmd)) m_status++; else return path_cmd_line_to; case 8: cmd = path_cmd_end_poly | path_flags_close | path_flags_ccw; m_status++; break; } return cmd; } } |