Uses the 1d fractal mountain code to generate a constantly changing electrical 'zap'. Also plays a looping sound effect.

zap.py

import sys, random
from pyglet.gl import *

window = pyglet.window.Window()

tex = pyglet.image.load('glow.png').get_texture()
sound = pyglet.media.load('zap.wav')
player = pyglet.media.Player()
player.queue(sound)
player.eos_action = player.EOS_LOOP
player.play()

seed = 1
pause = False

def generatePoints(level,seed):
    random.seed(seed)
    numPoints = 2**level + 1
    p = [0] * numPoints
    displacement = 0.1
    for l in range(level-1, -1, -1):
        step = 2**l
        for i in range(step, numPoints, step*2):
            p[i] = (p[i-step] + p[i+step])/2.0 + random.gauss(0.0, displacement)
        displacement /= 1.7
    return p

def createShape(level,seed):
    points = generatePoints(level,seed)
    verts = []
    texcoords = []
    x = 0
    for p in points:
        y = p * 640.0 + 240.0
        texcoords += [0, 0]
        verts += [x, y-10.0]
        texcoords += [0, 1]
        verts += [x, y+10.0]
        x = x + 640.0/(len(points)-1.0)
    return pyglet.graphics.vertex_list(len(verts)/2, ('v2f', verts), ('t2f', texcoords))

def updateShape(level,seed):
    global vlist
    points = generatePoints(level,seed)
    verts = []
    texcoords = []
    x = 0
    for p in points:
        y = p * 640.0 + 240.0
        texcoords += [0, 0]
        verts += [x, y-10.0]
        texcoords += [0, 1]
        verts += [x, y+10.0]
        x = x + 640.0/(len(points)-1.0)
    vlist.vertices = verts
    vlist.texcoords = texcoords

level = 7

vlist = createShape(level,seed)

@window.event
def on_draw():
    global vlist
    glClear(GL_COLOR_BUFFER_BIT)
    glColor3f(1,1,0)
    glEnable(GL_TEXTURE_2D)
    glBindTexture(GL_TEXTURE_2D, tex.id)
    vlist.draw(GL_QUAD_STRIP)
    glDisable(GL_TEXTURE_2D)
    

@window.event
def on_key_press(key, modifiers):
    global level, pause, vlist
    if key == pyglet.window.key.PLUS or key == pyglet.window.key.EQUAL:
        level += 1
        vlist = createShape(level, seed)
    elif key == pyglet.window.key.MINUS and level > 0:
        level -= 1
        vlist = createShape(level, seed)
    elif key == pyglet.window.key.SPACE:
        pause = not pause
        if pause:
            player.pause()
        else:
            player.play()


def update(dt):
    global seed, level, pause
    if not pause:
        seed = seed + 1
        updateShape(level,seed)

pyglet.clock.schedule_interval(update,1/60.0)
pyglet.app.run()