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-rwxr-xr-xagg/source/agg_vcgen_stroke.cpp246
1 files changed, 246 insertions, 0 deletions
diff --git a/agg/source/agg_vcgen_stroke.cpp b/agg/source/agg_vcgen_stroke.cpp
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+++ b/agg/source/agg_vcgen_stroke.cpp
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+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.3
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software
+// is granted provided this copyright notice appears in all copies.
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+// mcseemagg@yahoo.com
+// http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Stroke generator
+//
+//----------------------------------------------------------------------------
+#include <math.h>
+#include "agg_vcgen_stroke.h"
+#include "agg_shorten_path.h"
+
+namespace agg
+{
+
+ //------------------------------------------------------------------------
+ vcgen_stroke::vcgen_stroke() :
+ m_src_vertices(),
+ m_out_vertices(),
+ m_width(0.5),
+ m_miter_limit(4.0),
+ m_inner_miter_limit(1.0 + 1.0/64.0),
+ m_approx_scale(1.0),
+ m_shorten(0.0),
+ m_line_cap(butt_cap),
+ m_line_join(miter_join),
+ m_inner_line_join(miter_join_revert),
+ m_closed(0),
+ m_status(initial),
+ m_src_vertex(0),
+ m_out_vertex(0)
+ {
+ }
+
+
+ //------------------------------------------------------------------------
+ void vcgen_stroke::miter_limit_theta(double t)
+ {
+ m_miter_limit = 1.0 / sin(t * 0.5) ;
+ }
+
+
+ //------------------------------------------------------------------------
+ void vcgen_stroke::remove_all()
+ {
+ m_src_vertices.remove_all();
+ m_closed = 0;
+ m_status = initial;
+ }
+
+
+ //------------------------------------------------------------------------
+ void vcgen_stroke::add_vertex(double x, double y, unsigned cmd)
+ {
+ m_status = initial;
+ if(is_move_to(cmd))
+ {
+ m_src_vertices.modify_last(vertex_dist(x, y));
+ }
+ else
+ {
+ if(is_vertex(cmd))
+ {
+ m_src_vertices.add(vertex_dist(x, y));
+ }
+ else
+ {
+ m_closed = get_close_flag(cmd);
+ }
+ }
+ }
+
+
+ //------------------------------------------------------------------------
+ void vcgen_stroke::rewind(unsigned)
+ {
+ if(m_status == initial)
+ {
+ m_src_vertices.close(m_closed != 0);
+ shorten_path(m_src_vertices, m_shorten, m_closed);
+ if(m_src_vertices.size() < 3) m_closed = 0;
+ }
+ m_status = ready;
+ m_src_vertex = 0;
+ m_out_vertex = 0;
+ }
+
+
+ //------------------------------------------------------------------------
+ unsigned vcgen_stroke::vertex(double* x, double* y)
+ {
+ unsigned cmd = path_cmd_line_to;
+ while(!is_stop(cmd))
+ {
+ switch(m_status)
+ {
+ case initial:
+ rewind(0);
+
+ case ready:
+ if(m_src_vertices.size() < 2 + unsigned(m_closed != 0))
+ {
+ cmd = path_cmd_stop;
+ break;
+ }
+ m_status = m_closed ? outline1 : cap1;
+ cmd = path_cmd_move_to;
+ m_src_vertex = 0;
+ m_out_vertex = 0;
+ break;
+
+ case cap1:
+ stroke_calc_cap(m_out_vertices,
+ m_src_vertices[0],
+ m_src_vertices[1],
+ m_src_vertices[0].dist,
+ m_line_cap,
+ m_width,
+ m_approx_scale);
+ m_src_vertex = 1;
+ m_prev_status = outline1;
+ m_status = out_vertices;
+ m_out_vertex = 0;
+ break;
+
+ case cap2:
+ stroke_calc_cap(m_out_vertices,
+ m_src_vertices[m_src_vertices.size() - 1],
+ m_src_vertices[m_src_vertices.size() - 2],
+ m_src_vertices[m_src_vertices.size() - 2].dist,
+ m_line_cap,
+ m_width,
+ m_approx_scale);
+ m_prev_status = outline2;
+ m_status = out_vertices;
+ m_out_vertex = 0;
+ break;
+
+ case outline1:
+ if(m_closed)
+ {
+ if(m_src_vertex >= m_src_vertices.size())
+ {
+ m_prev_status = close_first;
+ m_status = end_poly1;
+ break;
+ }
+ }
+ else
+ {
+ if(m_src_vertex >= m_src_vertices.size() - 1)
+ {
+ m_status = cap2;
+ break;
+ }
+ }
+ stroke_calc_join(m_out_vertices,
+ m_src_vertices.prev(m_src_vertex),
+ m_src_vertices.curr(m_src_vertex),
+ m_src_vertices.next(m_src_vertex),
+ m_src_vertices.prev(m_src_vertex).dist,
+ m_src_vertices.curr(m_src_vertex).dist,
+ m_width,
+ m_line_join,
+ m_inner_line_join,
+ m_miter_limit,
+ m_inner_miter_limit,
+ m_approx_scale);
+ ++m_src_vertex;
+ m_prev_status = m_status;
+ m_status = out_vertices;
+ m_out_vertex = 0;
+ break;
+
+ case close_first:
+ m_status = outline2;
+ cmd = path_cmd_move_to;
+
+ case outline2:
+ if(m_src_vertex <= unsigned(m_closed == 0))
+ {
+ m_status = end_poly2;
+ m_prev_status = stop;
+ break;
+ }
+
+ --m_src_vertex;
+ stroke_calc_join(m_out_vertices,
+ m_src_vertices.next(m_src_vertex),
+ m_src_vertices.curr(m_src_vertex),
+ m_src_vertices.prev(m_src_vertex),
+ m_src_vertices.curr(m_src_vertex).dist,
+ m_src_vertices.prev(m_src_vertex).dist,
+ m_width,
+ m_line_join,
+ m_inner_line_join,
+ m_miter_limit,
+ m_inner_miter_limit,
+ m_approx_scale);
+
+ m_prev_status = m_status;
+ m_status = out_vertices;
+ m_out_vertex = 0;
+ break;
+
+ case out_vertices:
+ if(m_out_vertex >= m_out_vertices.size())
+ {
+ m_status = m_prev_status;
+ }
+ else
+ {
+ const point_type& c = m_out_vertices[m_out_vertex++];
+ *x = c.x;
+ *y = c.y;
+ return cmd;
+ }
+ break;
+
+ case end_poly1:
+ m_status = m_prev_status;
+ return (unsigned)path_cmd_end_poly | (unsigned)path_flags_close | (unsigned)path_flags_ccw;
+
+ case end_poly2:
+ m_status = m_prev_status;
+ return (unsigned)path_cmd_end_poly | (unsigned)path_flags_close | (unsigned)path_flags_cw;
+
+ case stop:
+ cmd = path_cmd_stop;
+ break;
+ }
+ }
+ return cmd;
+ }
+
+}