blob: d7eb4be018ca52a16e45191b224567c2de76b28d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
//----------------------------------------------------------------------------
// 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
//----------------------------------------------------------------------------
#ifndef AGG_SHORTEN_PATH_INCLUDED
#define AGG_SHORTEN_PATH_INCLUDED
#include "agg_basics.h"
#include "agg_vertex_sequence.h"
namespace agg
{
template<class VertexSequence>
void shorten_path(VertexSequence& vs, FX_FLOAT s, unsigned closed = 0)
{
typedef typename VertexSequence::value_type vertex_type;
if(s > 0 && vs.size() > 1) {
FX_FLOAT d;
int n = int(vs.size() - 2);
while(n) {
d = vs[n].dist;
if(d > s) {
break;
}
vs.remove_last();
s -= d;
--n;
}
if(vs.size() < 2) {
vs.remove_all();
} else {
n = vs.size() - 1;
vertex_type& prev = vs[n - 1];
vertex_type& last = vs[n];
d = (prev.dist - s) / prev.dist;
FX_FLOAT x = prev.x + (last.x - prev.x) * d;
FX_FLOAT y = prev.y + (last.y - prev.y) * d;
last.x = x;
last.y = y;
if(!prev(last)) {
vs.remove_last();
}
vs.close(closed != 0);
}
}
}
}
#endif
|
