Comments on: Pygame Starfield Rain

By: Kamilche

Kamilche — Thu, 26 Oct 2006 18:26:12 +0000

Since the forum ate my spaces, here’s a link to the smaller faster rain generator:

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]

By: Kamilche

Kamilche — Thu, 26 Oct 2006 18:22:03 +0000

I thought your rain generator was interesting. Here’s a short version, that goes 10x faster, and still uses dirty rectangles. Enjoy!

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()

By: VxD

VxD — Tue, 24 Oct 2006 10:38:20 +0000

hehe, scriptfun may be the future community of game creators who share their codes and advices.. python/pygame is a language who permit this way.

good luck Chuck !

By: Chuck

Chuck — Sun, 22 Oct 2006 04:20:41 +0000

Thanks for the suggestion, Dave. I might consider putting up a forum sometime in the future, but for now, I would like to focus my efforts on adding content to this site. Thank you again!

By: Dave

Dave — Sat, 21 Oct 2006 20:20:30 +0000

typing in comments like this is annoying. I think you should start a simple free forum. There is al ist of software here: http://thinkofit.com/webconf/forumsoft.htm

By: Chuck

Chuck — Sat, 21 Oct 2006 11:27:58 +0000

The droplet’s appearance is determined by the dropimage() function. To make the drop circular, you would probably have to change the line with the fill into this:

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.

By: Dave

Dave — Sat, 21 Oct 2006 04:22:23 +0000

Thanks! I have read over the code a few times and i’ve figured out how it works. I have one question. When you look at the rain droplets, you see that they are square shaped. Is there a way to make them circular?

By: Chuck

Chuck — Fri, 20 Oct 2006 13:45:47 +0000

Carlo: Thank you so much for visiting the site, and I’m glad you’ve found the tutorials helpful. Sure, I’d like to see what you’re working on . Thanks for the link to the article. I’ve come across this article before, and I think it’s really interesting. Hopefully, I’ll be able to use the content of the article eventually to write something on game physics implementation. And yes, as you have pointed out, it should work well with a particle system. Thanks for pointing it out!

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

By: Dave

Dave — Thu, 19 Oct 2006 19:59:35 +0000

this is really interesting. Can I use the code in my own game?

By: Carlo

Carlo — Wed, 18 Oct 2006 21:03:34 +0000

Hey there, been following your blog for a while. I really like your tutorials, they’re very helpful to me. I’m working on a pygame of my own, I’d like to get your opinion on it if you don’t mind.

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.