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# Testing the BGL module
import Blender
from Blender.BGL import *
from Blender import Draw
R = G = B = 0
A = 1
instructions = "Hold mouse buttons to change the background color."
quitting = " Press ESC or q to quit."
def show_win():
glClearColor(R,G,B,A) # define color used to clear buffers
glClear(GL_COLOR_BUFFER_BIT) # use it to clear the color buffer
glColor3f(1,1,1) # change default color
glRasterPos2i(50,100) # move cursor to x = 50, y = 100
Draw.Text("Testing BGL + Draw") # draw this text there
glRasterPos2i(350,20) # move cursor again
Draw.Text(instructions + quitting) # draw another msg
glBegin(GL_LINE_LOOP) # begin a vertex-data list
glVertex2i(46,92)
glVertex2i(120,92)
glVertex2i(120,115)
glVertex2i(46,115)
glEnd() # close this list
glColor3f(0.35,0.18,0.92) # change default color again
glBegin(GL_POLYGON) # another list, for a polygon
glVertex2i(315, 292)
glVertex2i(412, 200)
glVertex2i(264, 256)
glEnd()
Draw.Redraw(1) # make changes visible.
def ev(evt, val): # this is a callback for Draw.Register()
global R,G,B,A # it handles input events
if evt == Draw.ESCKEY or evt == Draw.QKEY:
Draw.Exit() # this quits the script
elif evt == Draw.LEFTMOUSE: R = 1 - R
elif evt == Draw.MIDDLEMOUSE: G = 1 - G
elif evt == Draw.RIGHTMOUSE: B = 1 - B
else:
Draw.Register(show_win, ev, None)
Draw.Register(show_win, ev, None) # start the main loop
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