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#!/usr/bin/env python
#
# This program is originally shipped with PyGTK.
#
# Conversion from gtk.gl module to PyGtkGLExt by Naofumi Yasufuku
#
# A translation of the gears demo that comes with mesa, modified to use
# a few GtkHScale widgets for the rotation, rather than the keyboard.
import math
import sys
import pygtk
pygtk.require('2.0')
import gtk
import gobject
import gtk.gtkgl
from OpenGL.GL import *
# Draw a gear wheel. You'll probably want to call this function when
# building a display list since we do a lot of trig here.
#
# Input: inner_radius - radius of hole at center
# outer_radius - radius at center of teeth
# width - width of gear
# teeth - number of teeth
# tooth_depth - depth of tooth
def gear(inner_radius, outer_radius, width, teeth, tooth_depth):
cos = math.cos
sin = math.sin
r0 = inner_radius
r1 = outer_radius - tooth_depth/2.0
r2 = outer_radius + tooth_depth/2.0
da = 2.0*math.pi / teeth / 4.0
glShadeModel(GL_FLAT)
glNormal3f(0.0, 0.0, 1.0)
# draw front face
glBegin(GL_QUAD_STRIP)
for i in range(teeth + 1):
angle = i * 2.0*math.pi / teeth
glVertex3f(r0*cos(angle), r0*sin(angle), width*0.5)
glVertex3f(r1*cos(angle), r1*sin(angle), width*0.5)
glVertex3f(r0*cos(angle), r0*sin(angle), width*0.5)
glVertex3f(r1*cos(angle+3*da), r1*sin(angle+3*da), width*0.5)
glEnd()
# draw front sides of teeth
glBegin(GL_QUADS)
da = 2.0*math.pi / teeth / 4.0
for i in range(teeth):
angle = i * 2.0*math.pi / teeth
glVertex3f(r1*cos(angle), r1*sin(angle), width*0.5)
glVertex3f(r2*cos(angle+da), r2*sin(angle+da), width*0.5)
glVertex3f(r2*cos(angle+2*da), r2*sin(angle+2*da), width*0.5)
glVertex3f(r1*cos(angle+3*da), r1*sin(angle+3*da), width*0.5)
glEnd()
glNormal3f(0.0, 0.0, -1.0)
# draw back face
glBegin(GL_QUAD_STRIP)
for i in range(teeth + 1):
angle = i * 2.0*math.pi / teeth
glVertex3f(r1*cos(angle), r1*sin(angle), -width*0.5)
glVertex3f(r0*cos(angle), r0*sin(angle), -width*0.5)
glVertex3f(r1*cos(angle+3*da), r1*sin(angle+3*da),-width*0.5)
glVertex3f(r0*cos(angle), r0*sin(angle), -width*0.5)
glEnd()
# draw back sides of teeth
glBegin(GL_QUADS)
da = 2.0*math.pi / teeth / 4.0
for i in range(teeth):
angle = i * 2.0*math.pi / teeth
glVertex3f(r1*cos(angle+3*da), r1*sin(angle+3*da),-width*0.5)
glVertex3f(r2*cos(angle+2*da), r2*sin(angle+2*da),-width*0.5)
glVertex3f(r2*cos(angle+da), r2*sin(angle+da), -width*0.5)
glVertex3f(r1*cos(angle), r1*sin(angle), -width*0.5)
glEnd()
# draw outward faces of teeth
glBegin(GL_QUAD_STRIP)
for i in range(teeth):
angle = i * 2.0*math.pi / teeth
glVertex3f(r1*cos(angle), r1*sin(angle), width*0.5)
glVertex3f(r1*cos(angle), r1*sin(angle), -width*0.5)
u = r2*cos(angle+da) - r1*cos(angle)
v = r2*sin(angle+da) - r1*sin(angle)
len = math.sqrt(u*u + v*v)
u = u / len
v = v / len
glNormal3f(v, -u, 0.0)
glVertex3f(r2*cos(angle+da), r2*sin(angle+da), width*0.5)
glVertex3f(r2*cos(angle+da), r2*sin(angle+da), -width*0.5)
glNormal3f(cos(angle), sin(angle), 0.0)
glVertex3f(r2*cos(angle+2*da), r2*sin(angle+2*da), width*0.5)
glVertex3f(r2*cos(angle+2*da), r2*sin(angle+2*da),-width*0.5)
u = r1*cos(angle+3*da) - r2*cos(angle+2*da)
v = r1*sin(angle+3*da) - r2*sin(angle+2*da)
glNormal3f(v, -u, 0.0)
glVertex3f(r1*cos(angle+3*da), r1*sin(angle+3*da), width*0.5)
glVertex3f(r1*cos(angle+3*da), r1*sin(angle+3*da),-width*0.5)
glNormal3f(cos(angle), sin(angle), 0.0)
glVertex3f(r1*cos(0), r1*sin(0), width*0.5)
glVertex3f(r1*cos(0), r1*sin(0), -width*0.5)
glEnd()
glShadeModel(GL_SMOOTH)
# draw inside radius cylinder
glBegin(GL_QUAD_STRIP)
for i in range(teeth + 1):
angle = i * 2.0*math.pi / teeth;
glNormal3f(-cos(angle), -sin(angle), 0.0)
glVertex3f(r0*cos(angle), r0*sin(angle), -width*0.5)
glVertex3f(r0*cos(angle), r0*sin(angle), width*0.5)
glEnd()
view_rotx=20.0
view_roty=30.0
view_rotz=0.0
gear1 = 0
gear2 = 0
gear3 = 0
angle = 0.0
def draw(glarea, event):
# get GLContext and GLDrawable
glcontext = gtk.gtkgl.widget_get_gl_context(glarea)
gldrawable = gtk.gtkgl.widget_get_gl_drawable(glarea)
# GL calls
if not gldrawable.gl_begin(glcontext): return
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
glPushMatrix()
glRotatef(view_rotx, 1.0, 0.0, 0.0)
glRotatef(view_roty, 0.0, 1.0, 0.0)
glRotatef(view_rotz, 0.0, 0.0, 1.0)
glPushMatrix()
glTranslatef(-3.0, -2.0, 0.0)
glRotatef(angle, 0.0, 0.0, 1.0)
glCallList(gear1)
glPopMatrix()
glPushMatrix()
glTranslatef(3.1, -2.0, 0.0)
glRotatef(-2.0*angle-9.0, 0.0, 0.0, 1.0)
glCallList(gear2)
glPopMatrix()
glPushMatrix()
glTranslatef(-3.1, 4.2, 0.0)
glRotatef(-2.0*angle-25.0, 0.0, 0.0, 1.0)
glCallList(gear3)
glPopMatrix()
glPopMatrix()
if gldrawable.is_double_buffered():
gldrawable.swap_buffers()
else:
glFlush()
gldrawable.gl_end()
return True
def reshape(glarea, event):
# get GLContext and GLDrawable
glcontext = gtk.gtkgl.widget_get_gl_context(glarea)
gldrawable = gtk.gtkgl.widget_get_gl_drawable(glarea)
# GL calls
if not gldrawable.gl_begin(glcontext): return
x, y, width, height = glarea.get_allocation()
glViewport(0, 0, width, height)
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
if width > height:
w = float(width) / float(height)
glFrustum(-w, w, -1.0, 1.0, 5.0, 60.0)
else:
h = float(height) / float(width)
glFrustum(-1.0, 1.0, -h, h, 5.0, 60.0)
glMatrixMode(GL_MODELVIEW)
glLoadIdentity()
glTranslatef(0.0, 0.0, -40.0)
gldrawable.gl_end()
return True
def init(glarea):
# get GLContext and GLDrawable
glcontext = gtk.gtkgl.widget_get_gl_context(glarea)
gldrawable = gtk.gtkgl.widget_get_gl_drawable(glarea)
# GL calls
if not gldrawable.gl_begin(glcontext): return
global gear1, gear2, gear3
pos = (5.0, 5.0, 10.0, 0.0)
red = (0.8, 0.1, 0.0, 1.0)
green = (0.0, 0.8, 0.2, 1.0)
blue = (0.2, 0.2, 1.0, 1.0)
glLightfv(GL_LIGHT0, GL_POSITION, pos)
glEnable(GL_CULL_FACE)
glEnable(GL_LIGHTING)
glEnable(GL_LIGHT0)
glEnable(GL_DEPTH_TEST)
# make the gears
gear1 = glGenLists(1)
glNewList(gear1, GL_COMPILE)
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red)
gear(1.0, 4.0, 1.0, 20, 0.7)
glEndList()
gear2 = glGenLists(1)
glNewList(gear2, GL_COMPILE)
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green)
gear(0.5, 2.0, 2.0, 10, 0.7)
glEndList()
gear3 = glGenLists(1)
glNewList(gear3, GL_COMPILE)
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue)
gear(1.3, 2.0, 0.5, 10, 0.7)
glEndList()
glEnable(GL_NORMALIZE)
gldrawable.gl_end()
def idle(glarea):
global angle
angle = angle + 2.0
# Invalidate whole window.
glarea.window.invalidate_rect(glarea.allocation, False)
# Update window synchronously (fast).
glarea.window.process_updates(False)
return True
def map(glarea, event):
gobject.idle_add(idle, glarea)
return True
def xchange(adj):
global view_rotx
view_rotx = adj.value
def ychange(adj):
global view_roty
view_roty = adj.value
def zchange(adj):
global view_rotz
view_rotz = adj.value
#
# GLX version
#
major, minor = gtk.gdkgl.query_version()
print "GLX version = %d.%d" % (major, minor)
#
# frame buffer configuration
#
# use GLUT-style display mode bitmask
try:
# try double-buffered
glconfig = gtk.gdkgl.Config(mode=(gtk.gdkgl.MODE_RGB |
gtk.gdkgl.MODE_DOUBLE |
gtk.gdkgl.MODE_DEPTH))
except gtk.gdkgl.NoMatches:
# try single-buffered
glconfig = gtk.gdkgl.Config(mode=(gtk.gdkgl.MODE_RGB |
gtk.gdkgl.MODE_DEPTH))
# use GLX-style attribute list
# try:
# # try double-buffered
# glconfig = gtk.gdkgl.Config(attrib_list=(gtk.gdkgl.RGBA,
# gtk.gdkgl.DOUBLEBUFFER,
# gtk.gdkgl.DEPTH_SIZE, 1))
# except gtk.gdkgl.NoMatches:
# # try single-buffered
# glconfig = gtk.gdkgl.Config(attrib_list=(gtk.gdkgl.RGBA,
# gtk.gdkgl.DEPTH_SIZE, 1))
print "glconfig.is_rgba() =", glconfig.is_rgba()
print "glconfig.is_double_buffered() =", glconfig.is_double_buffered()
print "glconfig.has_depth_buffer() =", glconfig.has_depth_buffer()
# get_attrib()
print "gtk.gdkgl.RGBA = %d" % glconfig.get_attrib(gtk.gdkgl.RGBA)
print "gtk.gdkgl.DOUBLEBUFFER = %d" % glconfig.get_attrib(gtk.gdkgl.DOUBLEBUFFER)
print "gtk.gdkgl.DEPTH_SIZE = %d" % glconfig.get_attrib(gtk.gdkgl.DEPTH_SIZE)
#
# top-level gtk.Window
#
win = gtk.Window()
win.set_title("Gears")
if sys.platform != 'win32':
win.set_resize_mode(gtk.RESIZE_IMMEDIATE)
win.set_reallocate_redraws(True)
win.connect('destroy', gtk.main_quit)
#
# gtk.Table
#
table = gtk.Table(4, 2)
win.add(table)
table.show()
#
# gtk.DrawingArea for OpenGL scene
#
glarea = gtk.DrawingArea()
glarea.set_size_request(300, 300)
# make glarea OpenGL-capable
gtk.gtkgl.widget_set_gl_capability(glarea, glconfig)
glarea.connect_after('realize', init)
glarea.connect('configure_event', reshape)
glarea.connect('expose_event', draw)
glarea.connect('map_event', map)
table.attach(glarea, 0, 2, 0, 1)
glarea.show()
#
# rotation sliders
#
for row, label, start, cb in ((1, "X Rotation", view_rotx, xchange),
(2, "Y Rotation", view_roty, ychange),
(3, "Z Rotation", view_rotz, zchange)):
l = gtk.Label(label)
table.attach(l, 0, 1, row, row+1, xoptions=0, yoptions=gtk.FILL)
l.show()
adj = gtk.Adjustment(start, 0, 360, 5, 5, 0)
adj.connect('value_changed', cb)
scale = gtk.HScale(adj)
table.attach(scale, 1, 2, row, row+1, yoptions=gtk.FILL)
scale.show()
#
# main loop
#
win.show()
gtk.main()
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