>> have you read http://catb.org/~esr/faqs/smart-questions.html ?
> I feel the replies so far have been very reasonable.
Me too.
Try harder.
# OpenGL Projections
#---------------------------------
from pyglet import window,image
from pyglet.window import key
from pyglet.gl import *
def opengl_init():
glEnable(GL_BLEND)
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
glDepthFunc(GL_LEQUAL)
def your_test_code():
glColor4f(1,1,1,1)
glBegin(GL_LINES)
glVertex3f(0,0,0)
glVertex3f(640,480,0)
glEnd()
class camera():
mode=1
x,y,z=0,0,512
rx,ry,rz=30,-45,0
w,h=640,480
far=8192
fov=60
def view(self,width,height):
self.w,self.h=width,height
glViewport(0, 0, width, height)
print "Viewport "+str(width)+"x"+str(height)
if self.mode==2: self.isometric()
elif self.mode==3: self.perspective()
else: self.default()
def default(self):
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
glOrtho(0, self.w, 0, self.h, -1, 1)
glMatrixMode(GL_MODELVIEW)
def isometric(self):
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
glOrtho(-self.w/2.,self.w/2.,-self.h/2.,self.h/2.,0,self.far)
glMatrixMode(GL_MODELVIEW)
def perspective(self):
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
gluPerspective(self.fov, float(self.w)/self.h, 0.1, self.far)
glMatrixMode(GL_MODELVIEW)
def key(self, symbol, modifiers):
if symbol==key.F1:
self.mode=1
self.default()
print "Projection: Pyglet default"
elif symbol==key.F2:
print "Projection: 3D Isometric"
self.mode=2
self.isometric()
elif symbol==key.F3:
print "Projection: 3D Perspective"
self.mode=3
self.perspective()
elif self.mode==3 and symbol==key.NUM_SUBTRACT:
self.fov-=1
self.perspective()
elif self.mode==3 and symbol==key.NUM_ADD:
self.fov+=1
self.perspective()
else: print "KEY "+key.symbol_string(symbol)
def drag(self, x, y, dx, dy, button, modifiers):
if button==1:
self.x-=dx*2
self.y-=dy*2
elif button==2:
self.x-=dx*2
self.z-=dy*2
elif button==4:
self.ry+=dx/4.
self.rx-=dy/4.
def apply(self):
glLoadIdentity()
if self.mode==1: return
glTranslatef(-self.x,-self.y,-self.z)
glRotatef(self.rx,1,0,0)
glRotatef(self.ry,0,1,0)
glRotatef(self.rz,0,0,1)
def x_array(list):
return (GLfloat * len(list))(*list)
def axis(d=200):
vertices,colors=[],[]
#XZ RED
vertices.extend([-d, 0,-d, d, 0,-d, d, 0, d,-d, 0, d])
for i in range (0,4): colors.extend([1,0,0,0.5])
#YZ GREEN
vertices.extend([ 0,-d,-d, 0,-d, d, 0, d, d, 0, d,-d])
for i in range (0,4): colors.extend([0,1,0,0.5])
#XY BLUE
vertices.extend([-d,-d, 0, d,-d, 0, d, d, 0,-d, d, 0])
for i in range (0,4): colors.extend([0,0,1,0.5])
return x_array(vertices),x_array(colors)
AXIS_VERTICES,AXIS_COLORS=axis()
def draw_vertex_array(vertices,colors,mode=GL_LINES):
glEnableClientState(GL_VERTEX_ARRAY)
glEnableClientState(GL_COLOR_ARRAY)
glColorPointer(4, GL_FLOAT, 0, colors)
glVertexPointer(3, GL_FLOAT, 0, vertices)
glDrawArrays(GL_QUADS, 0, len(vertices)/3)
glDisableClientState(GL_VERTEX_ARRAY)
glDisableClientState(GL_COLOR_ARRAY)
def draw_axis():
glEnable(GL_DEPTH_TEST)
draw_vertex_array(AXIS_VERTICES,AXIS_COLORS,GL_QUADS)
glDisable(GL_DEPTH_TEST)
print "OpenGL playground for newbies"
print "---------------------------------"
print "Projection matrix -> F1, F2, F3"
print "Camera -> Drag LMB,CMB,RMB"
print ""
cam=camera()
win = window.Window(resizable=True)
win.on_resize=cam.view
win.on_key_press=cam.key
win.on_mouse_drag=cam.drag
opengl_init()
while not win.has_exit:
win.dispatch_events()
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
cam.apply()
draw_axis()
your_test_code()
win.flip()
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