From c2587c76f1b416cdbecb979e54941933246bf856 Mon Sep 17 00:00:00 2001
From: Skip Montanaro <skip.montanaro@gmail.com>
Date: Tue, 16 Feb 2021 20:14:16 -0600
Subject: starting over

---
 demo/sgi/gl/mixing.py | 148 +++++++++++++++++++++++++-------------------------
 1 file changed, 74 insertions(+), 74 deletions(-)

(limited to 'demo/sgi/gl/mixing.py')

diff --git a/demo/sgi/gl/mixing.py b/demo/sgi/gl/mixing.py
index 294e65f..85af96c 100755
--- a/demo/sgi/gl/mixing.py
+++ b/demo/sgi/gl/mixing.py
@@ -1,8 +1,8 @@
 #! /ufs/guido/bin/sgi/python
 
-# Use Gouraud shading to mix colors. Requires Z-buffer.
+# Use Gouraud shading to mix colors.  Requires Z-buffer.
 # It changes the color assignments so fast that you see white.
-# Left button pauses, middle rotates the square. ESC to quit.
+# Left button pauses, middle rotates the square.  ESC to quit.
 # Experiment with a larger window (too slow) or smaller window (really white).
 
 from GL import *
@@ -11,57 +11,57 @@ import DEVICE
 from math import *
 
 #
-# tekenvlak : draw a square. with bgnpolygon
+#  tekenvlak : draw a square. with bgnpolygon
 #
 def tekenvlak (vc) :
- bgnpolygon()
- #vcarray (vc)
- for i in vc :
- c3f (i[1])
- v3f (i[0])
- endpolygon()
+	bgnpolygon()
+	#vcarray (vc)
+	for i in vc :
+		c3f (i[1])
+		v3f (i[0])
+	endpolygon()
 
 #
 # tekendoos : draw a box
 #
 def tekendoos (col) :
- v = [(-5.0,0.0,0.0),(0.0,5.0,0.0),(5.0,0.0,0.0),(0.0,-5.0,0.0)]
- vc = [(v[0],col[0]),(v[1],col[1]),(v[2],col[2]),(v[3],col[1])]
- tekenvlak (vc)
+	v = [(-5.0,0.0,0.0),(0.0,5.0,0.0),(5.0,0.0,0.0),(0.0,-5.0,0.0)]
+	vc = [(v[0],col[0]),(v[1],col[1]),(v[2],col[2]),(v[3],col[1])]
+	tekenvlak (vc)
 
 #
 # initialize gl
 #
 def initgl () :
- #
- # open window
- #
- foreground ()
- keepaspect (1, 1)
- prefposition (100, 500, 100, 500)
- w = winopen ('PYTHON RGB')
- keepaspect (1, 1)
- winconstraints()
- #
- # configure pipeline (2buf, GOURAUD and RGBmode)
- #
- doublebuffer ()
- zbuffer (1)
- shademodel (GOURAUD)
- RGBmode ()
- gconfig ()
- #
- # set viewing
- #
- perspective (900, 1, 1.0, 10.0)
- polarview (10.0, 0, 0, 0)
- #
- # ask for the REDRAW and ESCKEY events
- #
- qdevice(DEVICE.MOUSE2)
- qdevice(DEVICE.MOUSE3)
- qdevice(DEVICE.REDRAW)
- qdevice(DEVICE.ESCKEY)
+	#
+	# open window
+	#
+	foreground ()
+	keepaspect (1, 1)
+	prefposition (100, 500, 100, 500)
+	w = winopen ('PYTHON RGB')
+	keepaspect (1, 1)
+	winconstraints()
+	#
+	# configure pipeline (2buf, GOURAUD and RGBmode)
+	#
+	doublebuffer ()
+	zbuffer (1)
+	shademodel (GOURAUD)
+	RGBmode ()
+	gconfig ()
+	#
+	# set viewing
+	#
+	perspective (900, 1, 1.0, 10.0)
+	polarview (10.0, 0, 0, 0)
+	#
+	# ask for the REDRAW and ESCKEY events
+	#
+	qdevice(DEVICE.MOUSE2)
+	qdevice(DEVICE.MOUSE3)
+	qdevice(DEVICE.REDRAW)
+	qdevice(DEVICE.ESCKEY)
 
 
 #
@@ -69,48 +69,48 @@ def initgl () :
 #
 black = 0
 #
-# GoForIT : use 2buf to redraw the object 2n times. index i is used as
+# GoForIT : use 2buf to redraw the object 2n times. index i is used as 
 # the (smoothly changing) rotation angle
 #
 def GoForIt(i) :
- col = [(255.0,0.0,0.0), (0.0,255.0,0.0), (0.0,0.0,255.0)]
- twist = 0
- freeze = 1
- while 1 :
- if freeze <> 0 :
- col[0],col[1],col[2] = col[1],col[2],col[0]
- #
- # clear z-buffer and clear background to light-blue
- #
- zclear()
- cpack (black)
- clear()
- #
- tekendoos (col)
- #
- swapbuffers()
- #
- if qtest() <> 0 :
- dev, val = qread()
- if dev = DEVICE.ESCKEY :
- break
- elif dev = DEVICE.REDRAW :
- reshapeviewport ()
- elif dev = DEVICE.MOUSE2 and val <> 0 :
- twist = twist + 30
- perspective (900, 1, 1.0, 10.0)
- polarview (10.0, 0, 0, twist)
- elif dev = DEVICE.MOUSE3 and val <> 0 :
- freeze = 1 - freeze
+	col = [(255.0,0.0,0.0), (0.0,255.0,0.0), (0.0,0.0,255.0)]
+	twist = 0
+	freeze = 1
+	while 1 :
+		if freeze <> 0 :
+			col[0],col[1],col[2] = col[1],col[2],col[0]
+		#
+		# clear z-buffer and clear background to light-blue
+		#
+		zclear()
+		cpack (black)
+		clear()
+		#
+		tekendoos (col)
+		#
+		swapbuffers()
+		#
+		if qtest() <> 0 :
+			dev, val = qread()
+			if dev = DEVICE.ESCKEY :
+				break
+			elif dev = DEVICE.REDRAW :
+				reshapeviewport ()
+			elif dev = DEVICE.MOUSE2 and val <> 0 :
+				twist = twist + 30
+				perspective (900, 1, 1.0, 10.0)
+				polarview (10.0, 0, 0, twist)
+			elif dev = DEVICE.MOUSE3 and val <> 0 :
+				freeze = 1 - freeze
 
 
 # the main program
 #
 def main () :
- initgl ()
- GoForIt (0)
+	initgl ()
+	GoForIt (0)
 
 #
 # exec main
 #
-main ()
+main  ()
-- 
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