You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
215 lines
7.8 KiB
215 lines
7.8 KiB
|
|
//----------------------------------------------------------------------------
|
|
// XYQ: 2006-01-22 Copied from AGG project.
|
|
// TODO: This file uses intensive floating point operations, so it's NOT suitable
|
|
// for platforms like Symbian OS. We need to change to FIX format.
|
|
//----------------------------------------------------------------------------
|
|
//----------------------------------------------------------------------------
|
|
// 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 "agg_vcgen_stroke.h"
|
|
|
|
namespace agg
|
|
{
|
|
|
|
vcgen_stroke::vcgen_stroke() :
|
|
m_src_vertices(),
|
|
m_out_vertices(),
|
|
m_width(0.5f),
|
|
m_miter_limit(4 * 1.0f),
|
|
m_inner_miter_limit(1.0f + 1.0f / 100),
|
|
m_approx_scale(1.0f),
|
|
m_line_cap(butt_cap),
|
|
m_line_join(miter_join),
|
|
m_inner_join(inner_miter),
|
|
m_closed(0),
|
|
m_status(initial),
|
|
m_src_vertex(0),
|
|
m_out_vertex(0)
|
|
{
|
|
}
|
|
void vcgen_stroke::remove_all()
|
|
{
|
|
m_src_vertices.remove_all();
|
|
m_closed = 0;
|
|
m_status = initial;
|
|
}
|
|
void vcgen_stroke::add_vertex(float x, float y, unsigned cmd)
|
|
{
|
|
m_status = initial;
|
|
if(is_move_to(cmd)) {
|
|
m_src_vertices.modify_last(vertex_dist_cmd(x, y, cmd));
|
|
} else {
|
|
if(is_vertex(cmd)) {
|
|
m_src_vertices.add(vertex_dist_cmd(x, y, cmd));
|
|
} else {
|
|
m_closed = get_close_flag(cmd);
|
|
}
|
|
}
|
|
}
|
|
static inline void calc_butt_cap(float* cap,
|
|
const vertex_dist& v0,
|
|
const vertex_dist& v1,
|
|
float len,
|
|
float width) {
|
|
float dx = (v1.y - v0.y) * width / len;
|
|
float dy = (v1.x - v0.x) * width / len;
|
|
cap[0] = v0.x - dx;
|
|
cap[1] = v0.y + dy;
|
|
cap[2] = v0.x + dx;
|
|
cap[3] = v0.y - dy;
|
|
}
|
|
void vcgen_stroke::rewind(unsigned)
|
|
{
|
|
if(m_status == initial) {
|
|
m_src_vertices.close(m_closed != 0);
|
|
if(m_src_vertices.size() < 3) {
|
|
m_closed = 0;
|
|
}
|
|
}
|
|
m_status = ready;
|
|
m_src_vertex = 0;
|
|
m_out_vertex = 0;
|
|
}
|
|
unsigned vcgen_stroke::vertex(float* x, float* y)
|
|
{
|
|
unsigned cmd = path_cmd_line_to;
|
|
line_join_e curj;
|
|
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;
|
|
}
|
|
}
|
|
curj = m_src_vertices[m_src_vertex].cmd & path_flags_jr ? miter_join_round : m_line_join;
|
|
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,
|
|
curj,
|
|
m_inner_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;
|
|
curj = m_src_vertices[m_src_vertex].cmd & path_flags_jr ? miter_join_round : m_line_join;
|
|
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,
|
|
curj,
|
|
m_inner_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 path_cmd_end_poly | path_flags_close | path_flags_ccw;
|
|
case end_poly2:
|
|
m_status = m_prev_status;
|
|
return path_cmd_end_poly | path_flags_close | path_flags_cw;
|
|
case stop:
|
|
cmd = path_cmd_stop;
|
|
break;
|
|
}
|
|
}
|
|
return cmd;
|
|
}
|
|
}
|