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
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
#include "TriangulateWall.hpp"
#include "MTUtils.hpp"
namespace Slic3r {
class Ring {
size_t idx = 0, nextidx = 1, startidx = 0, begin = 0, end = 0;
public:
explicit Ring(size_t from, size_t to) : begin(from), end(to) { init(begin); }
size_t size() const { return end - begin; }
std::pair<size_t, size_t> pos() const { return {idx, nextidx}; }
bool is_lower() const { return idx < size(); }
void inc()
{
if (nextidx != startidx) nextidx++;
if (nextidx == end) nextidx = begin;
idx ++;
if (idx == end) idx = begin;
}
void init(size_t pos)
{
startidx = begin + (pos - begin) % size();
idx = startidx;
nextidx = begin + (idx + 1 - begin) % size();
}
bool is_finished() const { return nextidx == idx; }
};
static double sq_dst(const Vec3d &v1, const Vec3d& v2)
{
Vec3d v = v1 - v2;
return v.x() * v.x() + v.y() * v.y() /*+ v.z() * v.z()*/;
}
static double score(const Ring& onring, const Ring &offring,
const std::vector<Vec3d> &pts)
{
double a = sq_dst(pts[onring.pos().first], pts[offring.pos().first]);
double b = sq_dst(pts[onring.pos().second], pts[offring.pos().first]);
return (std::abs(a) + std::abs(b)) / 2.;
}
class Triangulator {
const std::vector<Vec3d> *pts;
Ring *onring, *offring;
double calc_score() const
{
return Slic3r::score(*onring, *offring, *pts);
}
void synchronize_rings()
{
Ring lring = *offring;
auto minsc = Slic3r::score(*onring, lring, *pts);
size_t imin = lring.pos().first;
lring.inc();
while(!lring.is_finished()) {
double score = Slic3r::score(*onring, lring, *pts);
if (score < minsc) { minsc = score; imin = lring.pos().first; }
lring.inc();
}
offring->init(imin);
}
void emplace_indices(std::vector<Vec3i> &indices)
{
Vec3i tr{int(onring->pos().first), int(onring->pos().second),
int(offring->pos().first)};
if (onring->is_lower()) std::swap(tr(0), tr(1));
indices.emplace_back(tr);
}
public:
void run(std::vector<Vec3i> &indices)
{
synchronize_rings();
double score = 0, prev_score = 0;
while (!onring->is_finished() || !offring->is_finished()) {
prev_score = score;
if (onring->is_finished() || (score = calc_score()) > prev_score) {
std::swap(onring, offring);
} else {
emplace_indices(indices);
onring->inc();
}
}
}
explicit Triangulator(const std::vector<Vec3d> *points,
Ring & lower,
Ring & upper)
: pts{points}, onring{&upper}, offring{&lower}
{}
};
Wall triangulate_wall(
const Polygon & lower,
const Polygon & upper,
double lower_z_mm,
double upper_z_mm)
{
if (upper.points.size() < 3 || lower.points.size() < 3) return {};
Wall wall;
auto &pts = wall.first;
auto &ind = wall.second;
pts.reserve(lower.points.size() + upper.points.size());
for (auto &p : lower.points)
wall.first.emplace_back(unscaled(p.x()), unscaled(p.y()), lower_z_mm);
for (auto &p : upper.points)
wall.first.emplace_back(unscaled(p.x()), unscaled(p.y()), upper_z_mm);
ind.reserve(2 * (lower.size() + upper.size()));
Ring lring{0, lower.points.size()}, uring{lower.points.size(), pts.size()};
Triangulator t{&pts, lring, uring};
t.run(ind);
return wall;
}
} // namespace Slic3r
|
