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
134
|
/**
* Generate approximate mesh gradients for blurring technique suggested by bbyak.
* (njh)
*/
#include <2geom/d2.h>
#include <2geom/sbasis.h>
#include <2geom/sbasis-2d.h>
#include <2geom/bezier-to-sbasis.h>
#include <2geom/path.h>
#include <toys/path-cairo.h>
#include <toys/toy-framework-2.h>
#include <vector>
using std::vector;
using namespace Geom;
unsigned total_pieces_sub;
unsigned total_pieces_inc;
const double u_subs = 5,
v_subs = 5,
fudge = .01;
const double inv_u_subs = 1 / u_subs,
inv_v_subs = 1 / v_subs;
class Sb2d2: public Toy {
public:
PointSetHandle hand;
Sb2d2() {
handles.push_back(&hand);
}
void draw(cairo_t *cr, std::ostringstream *notify, int width, int height, bool save, std::ostringstream *timer_stream) override {
D2<SBasis2d> sb2;
for(unsigned dim = 0; dim < 2; dim++) {
sb2[dim].us = 2;
sb2[dim].vs = 2;
const int depth = sb2[dim].us*sb2[dim].vs;
sb2[dim].resize(depth, Linear2d(0));
}
Geom::Point dir(1,-2);
if(hand.pts.empty()) {
for(unsigned vi = 0; vi < sb2[0].vs; vi++)
for(unsigned ui = 0; ui < sb2[0].us; ui++)
for(unsigned iv = 0; iv < 2; iv++)
for(unsigned iu = 0; iu < 2; iu++)
hand.pts.emplace_back((2*(iu+ui)/(2.*ui+1)+1)*width/4.,
(2*(iv+vi)/(2.*vi+1)+1)*width/4.);
}
for(int dim = 0; dim < 2; dim++) {
Geom::Point dir(0,0);
dir[dim] = 1;
for(unsigned vi = 0; vi < sb2[dim].vs; vi++)
for(unsigned ui = 0; ui < sb2[dim].us; ui++)
for(unsigned iv = 0; iv < 2; iv++)
for(unsigned iu = 0; iu < 2; iu++) {
unsigned corner = iu + 2*iv;
unsigned i = ui + vi*sb2[dim].us;
Geom::Point base((2*(iu+ui)/(2.*ui+1)+1)*width/4.,
(2*(iv+vi)/(2.*vi+1)+1)*width/4.);
if(vi == 0 && ui == 0) {
base = Geom::Point(width/4., width/4.);
}
double dl = dot((hand.pts[corner+4*i] - base), dir)/dot(dir,dir);
sb2[dim][i][corner] = dl/(width/2)*pow(4.0,(double)ui+vi);
}
}
cairo_d2_sb2d(cr, sb2, dir*0.1, width);
cairo_set_source_rgba (cr, 0., 0., 0, 0.5);
cairo_stroke(cr);
for(unsigned vi = 0; vi < v_subs; vi++) {
double tv = vi * inv_v_subs;
for(unsigned ui = 0; ui < u_subs; ui++) {
double tu = ui * inv_u_subs;
Geom::Path pb;
D2<SBasis> B;
D2<SBasis> tB;
B[0] = Linear(tu-fudge, tu+fudge + inv_u_subs );
B[1] = Linear(tv-fudge, tv-fudge);
tB = compose_each(sb2, B);
tB = tB*(width/2) + Geom::Point(width/4, width/4);
pb.append(tB);
B[0] = Linear(tu+fudge + inv_u_subs , tu+fudge + inv_u_subs);
B[1] = Linear(tv-fudge, tv+fudge + inv_v_subs);
tB = compose_each(sb2, B);
tB = tB*(width/2) + Geom::Point(width/4, width/4);
pb.append(tB);
B[0] = Linear(tu+fudge + inv_u_subs, tu-fudge);
B[1] = Linear(tv+fudge + inv_v_subs, tv+fudge + inv_v_subs);
tB = compose_each(sb2, B);
tB = tB*(width/2) + Geom::Point(width/4, width/4);
pb.append(tB);
B[0] = Linear(tu-fudge, tu-fudge);
B[1] = Linear(tv+fudge + inv_v_subs, tv-fudge);
tB = compose_each(sb2, B);
tB = tB*(width/2) + Geom::Point(width/4, width/4);
pb.append(tB);
cairo_path(cr, pb);
//std::cout << pb.peek().end() - pb.peek().begin() << std::endl;
cairo_set_source_rgba (cr, tu, tv, 0, 1);
cairo_fill(cr);
}
}
//*notify << "bo = " << sb2.index(0,0);
Toy::draw(cr, notify, width, height, save,timer_stream);
}
};
int main(int argc, char **argv) {
init(argc, argv, new Sb2d2);
return 0;
}
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
|
