2005-10-18 04:43:39 -05:00
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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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//
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// Rounded rectangle vertex generator
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//
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//----------------------------------------------------------------------------
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#include <math.h>
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#include "agg_rounded_rect.h"
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namespace agg
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{
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//------------------------------------------------------------------------
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rounded_rect::rounded_rect(double x1, double y1, double x2, double y2, double r) :
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m_x1(x1), m_y1(y1), m_x2(x2), m_y2(y2),
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m_rx1(r), m_ry1(r), m_rx2(r), m_ry2(r),
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m_rx3(r), m_ry3(r), m_rx4(r), m_ry4(r)
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{
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if(x1 > x2) { m_x1 = x2; m_x2 = x1; }
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if(y1 > y2) { m_y1 = y2; m_y2 = y1; }
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}
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//--------------------------------------------------------------------
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void rounded_rect::rect(double x1, double y1, double x2, double y2)
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{
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m_x1 = x1;
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m_y1 = y1;
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m_x2 = x2;
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m_y2 = y2;
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if(x1 > x2) { m_x1 = x2; m_x2 = x1; }
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if(y1 > y2) { m_y1 = y2; m_y2 = y1; }
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}
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//--------------------------------------------------------------------
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void rounded_rect::radius(double r)
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{
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m_rx1 = m_ry1 = m_rx2 = m_ry2 = m_rx3 = m_ry3 = m_rx4 = m_ry4 = r;
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}
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//--------------------------------------------------------------------
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void rounded_rect::radius(double rx, double ry)
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{
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m_rx1 = m_rx2 = m_rx3 = m_rx4 = rx;
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m_ry1 = m_ry2 = m_ry3 = m_ry4 = ry;
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}
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//--------------------------------------------------------------------
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void rounded_rect::radius(double rx_bottom, double ry_bottom,
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double rx_top, double ry_top)
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{
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m_rx1 = m_rx2 = rx_bottom;
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m_rx3 = m_rx4 = rx_top;
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m_ry1 = m_ry2 = ry_bottom;
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m_ry3 = m_ry4 = ry_top;
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}
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//--------------------------------------------------------------------
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void rounded_rect::radius(double rx1, double ry1, double rx2, double ry2,
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double rx3, double ry3, double rx4, double ry4)
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{
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m_rx1 = rx1; m_ry1 = ry1; m_rx2 = rx2; m_ry2 = ry2;
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m_rx3 = rx3; m_ry3 = ry3; m_rx4 = rx4; m_ry4 = ry4;
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}
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//--------------------------------------------------------------------
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void rounded_rect::normalize_radius()
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{
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double dx = fabs(m_y2 - m_y1);
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double dy = fabs(m_x2 - m_x1);
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double k = 1.0;
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double t;
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t = dx / (m_rx1 + m_rx2); if(t < k) k = t;
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t = dx / (m_rx3 + m_rx4); if(t < k) k = t;
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t = dy / (m_ry1 + m_ry2); if(t < k) k = t;
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t = dy / (m_ry3 + m_ry4); if(t < k) k = t;
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if(k < 1.0)
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{
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m_rx1 *= k; m_ry1 *= k; m_rx2 *= k; m_ry2 *= k;
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m_rx3 *= k; m_ry3 *= k; m_rx4 *= k; m_ry4 *= k;
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}
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}
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//--------------------------------------------------------------------
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void rounded_rect::rewind(unsigned)
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{
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m_status = 0;
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}
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//--------------------------------------------------------------------
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unsigned rounded_rect::vertex(double* x, double* y)
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{
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unsigned cmd = path_cmd_stop;
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switch(m_status)
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{
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case 0:
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m_arc.init(m_x1 + m_rx1, m_y1 + m_ry1, m_rx1, m_ry1,
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pi, pi+pi*0.5);
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m_arc.rewind(0);
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m_status++;
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case 1:
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cmd = m_arc.vertex(x, y);
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if(is_stop(cmd)) m_status++;
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else return cmd;
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case 2:
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m_arc.init(m_x2 - m_rx2, m_y1 + m_ry2, m_rx2, m_ry2,
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pi+pi*0.5, 0.0);
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m_arc.rewind(0);
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m_status++;
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case 3:
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cmd = m_arc.vertex(x, y);
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if(is_stop(cmd)) m_status++;
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else return path_cmd_line_to;
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case 4:
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m_arc.init(m_x2 - m_rx3, m_y2 - m_ry3, m_rx3, m_ry3,
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0.0, pi*0.5);
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m_arc.rewind(0);
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m_status++;
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case 5:
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cmd = m_arc.vertex(x, y);
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if(is_stop(cmd)) m_status++;
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else return path_cmd_line_to;
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case 6:
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m_arc.init(m_x1 + m_rx4, m_y2 - m_ry4, m_rx4, m_ry4,
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pi*0.5, pi);
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m_arc.rewind(0);
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m_status++;
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case 7:
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cmd = m_arc.vertex(x, y);
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if(is_stop(cmd)) m_status++;
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else return path_cmd_line_to;
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case 8:
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2006-06-19 23:00:03 -05:00
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cmd = (unsigned)path_cmd_end_poly | (unsigned)path_flags_close | (unsigned)path_flags_ccw;
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2005-10-18 04:43:39 -05:00
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m_status++;
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break;
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}
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return cmd;
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}
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}
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