Dave Pape davepape

UB projects and courses are here. Buffalo Infringement Festival repos are at @infringebuffalo. Ancient work repos are at @davepape-history

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University at Buffalo
Buffalo, NY
http://davepape.org

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davepape / alpha.py

Created October 8, 2013 03:51

basic alpha blending - a semi-transparent square blended over an opaque square

	import time, math
	from pyglet.gl import *

	window = pyglet.window.Window()

	class AlphaSquare:
	def __init__(self, color):
	self.xpos = 0
	self.ypos = 0
	self.color = color

davepape / smoothalpha.py

Created October 8, 2013 03:55

smooth shading of alpha values - applies same RGB, but different alpha to the top and bottom of a square

	import time, math
	from pyglet.gl import *

	window = pyglet.window.Window()

	class AlphaSquare2:
	def __init__(self, color1, color2):
	self.xpos = 0
	self.ypos = 0
	colors = color1 + color1 + color2 + color2

davepape / alphawheel.py

Created October 8, 2013 03:57

a soft-edged disc with alpha blending - the outer edge is fully transparent, while the center of the disc is opaque

	import time, math
	from pyglet.gl import *

	window = pyglet.window.Window()

	class Square:
	def __init__(self, color):
	self.color = color
	self.vlist = pyglet.graphics.vertex_list(4, ('v2f', [-128,-128, 128,-128, -128,128, 128,128]))
	def draw(self):

davepape / fade.py

Created October 8, 2013 03:57

fading an object in and out by changing its alpha value over time

	import time, math
	from pyglet.gl import *

	window = pyglet.window.Window()

	class AlphaSquare:
	def __init__(self, color):
	self.xpos = 0
	self.ypos = 0
	self.color = color

davepape / texalpha.py

Created October 8, 2013 03:58

using a texture map with an alpha channel to get a cut-out sprite

	import time, math
	from pyglet.gl import *

	window = pyglet.window.Window()


	class TexAlphaSquare:
	def __init__(self, width, height, xpos, ypos, texturefile, color):
	self.xpos = xpos
	self.ypos = ypos

davepape / filter.py

Created October 8, 2013 04:00

applying a "filter" - a square with different blending functions is drawn on top of the rendered scene. The first form fades everything in/out; the second multiplies everything by a color; the third creates a negative image

	import time, math
	from pyglet.gl import *

	window = pyglet.window.Window()


	class BlendFilter:
	def __init__(self, srcFunc, destFunc, color):
	self.srcFunc = srcFunc
	self.destFunc = destFunc

davepape / bounce.py

Created October 15, 2013 15:13

a bouncing ball, using a vector for movement

	import sys, time, math
	from pyglet.gl import *
	from euclid import *

	window = pyglet.window.Window(512,512)

	quadric = gluNewQuadric()
	ballPos = Vector2(256,256)
	ballVel = Vector2(200,145)

davepape / gravbounce.py

Created October 15, 2013 15:14

a bouncing ball, with gravitational acceleration pulling it downward

	import sys, time, math
	from pyglet.gl import *
	from euclid import *

	window = pyglet.window.Window(512,512)

	quadric = gluNewQuadric()

	ballPos = Vector2(256, 256)
	ballVel = Vector2(80, 0)

davepape / gravorbit.py

Last active December 25, 2015 14:48

simple solar system simulation - four objects moving with gravitation forces between them

	import sys, time, math
	from pyglet.gl import *
	from euclid import *

	GRAV_CONSTANT = 1

	window = pyglet.window.Window(512,512)

	def makeCircle(numPoints):
	verts = [0,0]

davepape / simplespring.py

Created October 15, 2013 15:17

basic spring simulation - two point masses connected by a spring

	import sys, time, math
	from pyglet.gl import *
	from euclid import *

	window = pyglet.window.Window(512,512)

	point0 = Vector2(100, 240)
	velocity0 = Vector2(0, 0)
	mass0 = 1
	point1 = Vector2(300, 240)

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