http://incarnation.danbo.com/ubbthreads/showflat.php?Cat=0&Number=10483&an=0&page=0#Post10483
[url]http://incarnation.danbo.com/ubbthreads/showflat.php?Cat=0&Number=10483&an=0&page=0#Post10483[/url]

import pygame
import random
import time

SCREENSIZE = 640, 480

class Rain(object):
‘ Rain generator’
drops = []
height = 160
speed = 1
color = (255, 255, 255, 255)
chance = .05

def __init__(self, **kwargs):
‘ Allow programmer to change settings of rain generator’
self.__dict__.update(kwargs)

def Render(self, screen):
‘ Render the rain’
dirtyrects = []
for drop in self.drops:
dr = drop.Render(dirtyrects, screen)

if drop.dead:
self.drops.remove(drop)
dirtyrects.append(dr)
if random.random() self.maxy:
self.dead = 1
else:
screen.blit(self.pic, self.pos)
return r

def main():
# Initialize pygame
pygame.init()
screen = pygame.display.set_mode(SCREENSIZE, 0, 32)

# Create rain generator
rain = Rain()

# Main loop
nexttime = time.time()
ctr = 0
quit = 0
while not quit:

# Uncomment the following line to make the rain go slower
#time.sleep(.01)

# Track FPS
if time.time() > nexttime:
nexttime = time.time() + 1
print ‘%d fps’ % ctr
ctr = 0
ctr += 1

# Draw rain
screen.fill((0, 0, 0, 0))
r = rain.Render(screen)

# Look for user quit
pygame.display.update(r)
pygame.event.pump()
for e in pygame.event.get():
if e.type in [pygame.QUIT, pygame.KEYDOWN, pygame.MOUSEBUTTONDOWN]:
quit = 1
break

# Terminate pygame
pygame.quit()

if __name__ == “__main__”:
main()

good luck Chuck !

pygame.draw.circle(image, (255, 255, 255), (1, 1), 2)

Here, we use pygame’s draw module to draw a white circle at the center of the “droplet surface” with radius 2, which should just about fill the “droplet surface”.

Hope this helps.

Dave: Sure! Feel free to use the code as you wish.

As for a particle system, have you heard of Verlet integration? Here’s the paper on it: http://www.teknikus.dk/tj/gdc2001.htm

It makes for really nice animations, and is nice because you only have to store the current location and old location of a particle.