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
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
|
#!/usr/bin/env python
# A simple example to demonstrate the use of PyGtkGLExt library.
# This program has been mapped to Python from C. The orginal C
# program 'coolwave.c' is distributed with GtkGLExt. It is based
# on Erik Larsen's demo 'newave'.
#
# Note that due to the slow nature of nested loops in Python,
# this program will not run very well in slow machines.
#
# Alif Wahid, <awah005@users.sourceforge.net>
# August 2003.
import math
import array
import pygtk
pygtk.require('2.0')
from gtk.gtkgl.apputils import *
from OpenGL.GL import *
from OpenGL.GLU import *
try:
GL_VERSION_1_1
except:
from OpenGL.GL.EXT.polygon_offset import *
# Some constants.
MAXGRID = 64
M_PI = math.pi
SQRTOFTWOINV = 0.707106781
class CoolWave (GLScene,
GLSceneButton,
GLSceneButtonMotion,
GLSceneKey,
GLSceneIdle):
''' An implementation of the GLScene and
related mixin interfaces. It renders an
animating 3D waveform. The waveform shows
up as a wireframe.
'''
def __init__ (self):
GLScene.__init__(self,
gtk.gdkgl.MODE_RGB |
gtk.gdkgl.MODE_DEPTH |
gtk.gdkgl.MODE_DOUBLE)
# Some private attributes needed
# for rendering purposes.
self.__lightPosition = [0.0, 0.0, 1.0, 1.0]
self.__grid = (MAXGRID/2)
self.__dt = 0.025
self.__sphi = 180.0
self.__stheta = 80.0
self.__sdepth = 1.25 * (MAXGRID/2)
self.__zNear = (MAXGRID/2)/10.0
self.__zFar = (MAXGRID/2)*3.0
self.__aspect = 1.25
self.__beginX = 0
self.__beginY = 0
self.__setup_arrays()
def __setup_arrays (self):
''' Creates the three matrices for
storing vertex data of the rendering waveform.
The matrices are pure python lists containing a
number of arrays. Each array forms one row.
'''
self.__force = []
self.__veloc = []
self.__posit = []
for i in xrange(0, MAXGRID):
self.__force.append(array.array('f', range(0, MAXGRID)))
self.__veloc.append(array.array('f', range(0, MAXGRID)))
self.__posit.append(array.array('f', range(0, MAXGRID)))
def __getforce (self, gridSize):
''' The force derivative of the transcendental
waveform is changed in order to cause a spatial
propagation of the 3D waveform.
'''
for i in xrange(0, gridSize):
for j in xrange(0, gridSize):
self.__force[i][j] = 0.0
for i in xrange(2, gridSize-2):
for j in xrange(2, gridSize-2):
d = self.__posit[i][j] - self.__posit[i][j-1]
self.__force[i][j] -= d
self.__force[i][j-1] += d
d = self.__posit[i][j] - self.__posit[i-1][j]
self.__force[i][j] -= d
self.__force[i-1][j] += d
d = self.__posit[i][j] - self.__posit[i][j+1]
self.__force[i][j] -= d
self.__force[i][j+1] += d
d = self.__posit[i][j] - self.__posit[i+1][j]
self.__force[i][j] -= d
self.__force[i+1][j] += d
d = (self.__posit[i][j] - self.__posit[i+1][j+1]) * SQRTOFTWOINV
self.__force[i][j] -= d
self.__force[i+1][j+1] += d
d = (self.__posit[i][j] - self.__posit[i-1][j-1]) * SQRTOFTWOINV
self.__force[i][j] -= d
self.__force[i-1][j-1] += d
d = (self.__posit[i][j] - self.__posit[i+1][j-1]) * SQRTOFTWOINV
self.__force[i][j] -= d
self.__force[i+1][j-1] += d
d = (self.__posit[i][j] - self.__posit[i-1][j+1]) * SQRTOFTWOINV
self.__force[i][j] -= d
self.__force[i-1][j+1] += d
def __getveloc (self, gridSize, dt):
''' Based on the force derivative calculate the
velocity of each vertex in the waveform.
'''
for i in xrange(0, gridSize):
for j in xrange(0, gridSize): self.__veloc[i][j] += self.__force[i][j] * dt
def __getposit (self, gridSize):
''' Based on the velocity calculate the
position of each vertex in the waveform.
'''
for i in xrange(0, gridSize):
for j in xrange(0, gridSize): self.__posit[i][j] += self.__veloc[i][j]
def __draw_wireframe (self, gridSize):
''' Use the vertex data to render the
waveform in 3D space.
'''
glColor3f(1.0, 1.0, 1.0)
for i in xrange(0, gridSize):
glBegin(GL_LINE_STRIP)
for j in xrange(0, gridSize): glVertex3f(float(i), float(j), self.__posit[i][j])
glEnd()
for i in xrange(0, gridSize):
glBegin(GL_LINE_STRIP)
for j in xrange(0, gridSize): glVertex3f(float(j), float(i), self.__posit[j][i])
glEnd()
def __init_wireframe (self, gridSize):
''' Initial shape of the waveform
is based on a transcendental function.
'''
for i in xrange(0, gridSize):
for j in xrange(0, gridSize):
self.__force[i][j] = 0.0
self.__veloc[i][j] = 0.0
self.__posit[i][j] = (math.sin(M_PI * 2 * i/gridSize) + math.sin(M_PI * 2 * j/gridSize)) * (gridSize/6.0)
if (i==0) or (j==0) or (i==(gridSize-1)) or (j==(gridSize-1)): self.__posit[i][j] = 0.0
# Following methods are implementation of
# the GLScene and related mixin interfaces.
def init (self):
glClearColor(0.0, 0.0, 0.0, 0.0)
glClearDepth(1.0)
glDepthFunc(GL_LEQUAL)
glEnable(GL_DEPTH_TEST)
glEnable(GL_CULL_FACE)
glEnable(GL_COLOR_MATERIAL)
glEnable(GL_LIGHT0)
if GL_VERSION_1_1:
glPolygonOffset(1.0, 1.0)
else:
# Check for the PolygonOffset extension.
if not glInitPolygonOffsetEXT():
print "Need glPolygonOffsetEXT()"
raise SystemExit
glPolygonOffsetEXT(1.0, 1.0)
glHint(GL_LINE_SMOOTH_HINT, GL_NICEST)
glHint(GL_POLYGON_SMOOTH_HINT, GL_NICEST)
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST)
glColorMaterial(GL_FRONT, GL_DIFFUSE)
glLightfv(GL_LIGHT0, GL_POSITION, self.__lightPosition)
glShadeModel(GL_FLAT)
glDisable(GL_LIGHTING)
self.__init_wireframe(self.__grid)
def display (self, width, height):
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
gluPerspective(64.0, self.__aspect, self.__zNear, self.__zFar)
glMatrixMode(GL_MODELVIEW)
glLoadIdentity()
glTranslatef(0.0,0.0,-self.__sdepth)
glRotatef(-self.__stheta, 1.0, 0.0, 0.0)
glRotatef(self.__sphi, 0.0, 0.0, 1.0)
glTranslatef(-float((self.__grid+1)/2 - 1), -float((self.__grid+1)/2 - 1), 0.0)
self.__draw_wireframe(self.__grid)
def reshape (self, width, height):
self.__aspect = float(width)/float(height)
glViewport(0,0, width, height)
def key_press (self, width, height, event):
if event.keyval == gtk.keysyms.i:
# Toggle animation.
self.toggle_idle()
elif event.keyval == gtk.keysyms.r:
# Reset the wave shape.
self.__init_wireframe(self.__grid)
elif event.keyval == gtk.keysyms.plus:
# Zoom in.
self.__sdepth -= 2.0
elif event.keyval == gtk.keysyms.minus:
# Zoom out.
self.__sdepth += 2.0
self.invalidate()
def key_release (self, width, height, event):
pass
def button_press (self, width, height, event):
if (event.button == 1) or (event.button == 2):
self.__beginX = event.x
self.__beginY = event.y
def button_release (self, width, height, event):
pass
def button_motion (self, width, height, event):
if event.state & gtk.gdk.BUTTON1_MASK:
self.__sphi += (event.x - self.__beginX)/4.0
self.__stheta += (self.__beginY - event.y)/4.0
elif event.state & gtk.gdk.BUTTON2_MASK:
self.__sdepth += (self.__beginY - event.y)/10.0
self.__beginX = event.x
self.__beginY = event.y
self.invalidate()
def idle (self, width, height):
self.__getforce(self.__grid)
self.__getveloc(self.__grid, self.__dt)
self.__getposit(self.__grid)
# Invalidate whole window.
self.invalidate()
# Update window synchronously (fast).
self.update()
if __name__ == '__main__':
glscene = CoolWave()
glapp = GLApplication(glscene)
glapp.set_title('CoolWave')
glapp.set_size_request(400, 250)
glapp.run()
|
