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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# vispy: gallery 60
"""
Dynamic planar graph layout.
"""
import numpy as np
from vispy import gloo, app
from vispy.gloo import set_viewport, set_state, clear
vert = """
#version 120
// Uniforms
// ------------------------------------
uniform mat4 u_model;
uniform mat4 u_view;
uniform mat4 u_projection;
uniform float u_antialias;
uniform float u_size;
// Attributes
// ------------------------------------
attribute vec3 a_position;
attribute vec4 a_fg_color;
attribute vec4 a_bg_color;
attribute float a_linewidth;
attribute float a_size;
// Varyings
// ------------------------------------
varying vec4 v_fg_color;
varying vec4 v_bg_color;
varying float v_size;
varying float v_linewidth;
varying float v_antialias;
void main (void) {
v_size = a_size * u_size;
v_linewidth = a_linewidth;
v_antialias = u_antialias;
v_fg_color = a_fg_color;
v_bg_color = a_bg_color;
gl_Position = u_projection * u_view * u_model *
vec4(a_position*u_size,1.0);
gl_PointSize = v_size + 2.*(v_linewidth + 1.5*v_antialias);
}
"""
frag = """
#version 120
// Constants
// ------------------------------------
// Varyings
// ------------------------------------
varying vec4 v_fg_color;
varying vec4 v_bg_color;
varying float v_size;
varying float v_linewidth;
varying float v_antialias;
// Functions
// ------------------------------------
float marker(vec2 P, float size);
// Main
// ------------------------------------
void main()
{
float size = v_size +2*(v_linewidth + 1.5*v_antialias);
float t = v_linewidth/2.0-v_antialias;
// The marker function needs to be linked with this shader
float r = marker(gl_PointCoord, size);
float d = abs(r) - t;
if( r > (v_linewidth/2.0+v_antialias))
{
discard;
}
else if( d < 0.0 )
{
gl_FragColor = v_fg_color;
}
else
{
float alpha = d/v_antialias;
alpha = exp(-alpha*alpha);
if (r > 0)
gl_FragColor = vec4(v_fg_color.rgb, alpha*v_fg_color.a);
else
gl_FragColor = mix(v_bg_color, v_fg_color, alpha);
}
}
float marker(vec2 P, float size)
{
float r = length((P.xy - vec2(0.5,0.5))*size);
r -= v_size/2.;
return r;
}
"""
vs = """
attribute vec3 a_position;
attribute vec4 a_fg_color;
attribute vec4 a_bg_color;
attribute float a_size;
attribute float a_linewidth;
void main(){
gl_Position = vec4(a_position, 1.);
}
"""
fs = """
void main(){
gl_FragColor = vec4(0., 0., 0., 1.);
}
"""
class Canvas(app.Canvas):
def __init__(self, **kwargs):
# Initialize the canvas for real
app.Canvas.__init__(self, keys='interactive', size=(512, 512),
**kwargs)
ps = self.pixel_scale
self.position = 50, 50
n = 100
ne = 100
data = np.zeros(n, dtype=[('a_position', np.float32, 3),
('a_fg_color', np.float32, 4),
('a_bg_color', np.float32, 4),
('a_size', np.float32),
('a_linewidth', np.float32),
])
edges = np.random.randint(size=(ne, 2), low=0,
high=n).astype(np.uint32)
data['a_position'] = np.hstack((.25 * np.random.randn(n, 2),
np.zeros((n, 1))))
data['a_fg_color'] = 0, 0, 0, 1
color = np.random.uniform(0.5, 1., (n, 3))
data['a_bg_color'] = np.hstack((color, np.ones((n, 1))))
data['a_size'] = np.random.randint(size=n, low=8*ps, high=20*ps)
data['a_linewidth'] = 1.*ps
u_antialias = 1
self.vbo = gloo.VertexBuffer(data)
self.index = gloo.IndexBuffer(edges)
self.view = np.eye(4, dtype=np.float32)
self.model = np.eye(4, dtype=np.float32)
self.projection = np.eye(4, dtype=np.float32)
self.program = gloo.Program(vert, frag)
self.program.bind(self.vbo)
self.program['u_size'] = 1
self.program['u_antialias'] = u_antialias
self.program['u_model'] = self.model
self.program['u_view'] = self.view
self.program['u_projection'] = self.projection
set_viewport(0, 0, *self.physical_size)
self.program_e = gloo.Program(vs, fs)
self.program_e.bind(self.vbo)
set_state(clear_color='white', depth_test=False, blend=True,
blend_func=('src_alpha', 'one_minus_src_alpha'))
self.show()
def on_resize(self, event):
set_viewport(0, 0, *event.physical_size)
def on_draw(self, event):
clear(color=True, depth=True)
self.program_e.draw('lines', self.index)
self.program.draw('points')
if __name__ == '__main__':
c = Canvas(title="Graph")
app.run()
|
