pygame / examples / stars.py

ahvezda 99d32cc 

pygame b658346 





pygame a933f97 
ahvezda 99d32cc 








Lenard Lindstrom ebd5456 




ahvezda 99d32cc 


Lenard Lindstrom ebd5456 













ahvezda 99d32cc 

Lenard Lindstrom ebd5456 



ahvezda 99d32cc 


Lenard Lindstrom ebd5456 









ahvezda 99d32cc 

Lenard Lindstrom ebd5456 











ahvezda 99d32cc 
Lenard Lindstrom ebd5456 













ahvezda 99d32cc 
pygame de76034 
ahvezda 99d32cc 

Lenard Lindstrom ebd5456 
ahvezda 99d32cc 
#!/usr/bin/env python

"""A simple starfield example. Note you can move the 'center' of
the starfield by leftclicking in the window. This example show
the basics of creating a window, simple pixel plotting, and input
event management"""


import random, math, pygame
from pygame.locals import *

#constants
WINSIZE = [640, 480]
WINCENTER = [320, 240]
NUMSTARS = 150


def init_star():
    "creates new star values"
    dir = random.randrange(100000)
    velmult = random.random()*.6+.4
    vel = [math.sin(dir) * velmult, math.cos(dir) * velmult]
    return vel, WINCENTER[:]


def initialize_stars():
    "creates a new starfield"
    stars = []
    for x in range(NUMSTARS):
        star = init_star()
        vel, pos = star
        steps = random.randint(0, WINCENTER[0])
        pos[0] = pos[0] + (vel[0] * steps)
        pos[1] = pos[1] + (vel[1] * steps)
        vel[0] = vel[0] * (steps * .09)
        vel[1] = vel[1] * (steps * .09)
        stars.append(star)
    move_stars(stars)
    return stars
  

def draw_stars(surface, stars, color):
    "used to draw (and clear) the stars"
    for vel, pos in stars:
        pos = (int(pos[0]), int(pos[1]))
        surface.set_at(pos, color)


def move_stars(stars):
    "animate the star values"
    for vel, pos in stars:
        pos[0] = pos[0] + vel[0]
        pos[1] = pos[1] + vel[1]
        if not 0 <= pos[0] <= WINSIZE[0] or not 0 <= pos[1] <= WINSIZE[1]:
            vel[:], pos[:] = init_star()
        else:
            vel[0] = vel[0] * 1.05
            vel[1] = vel[1] * 1.05
  

def main():
    "This is the starfield code"
    #create our starfield
    random.seed()
    stars = initialize_stars()
    clock = pygame.time.Clock()
    #initialize and prepare screen
    pygame.init()
    screen = pygame.display.set_mode(WINSIZE)
    pygame.display.set_caption('pygame Stars Example')
    white = 255, 240, 200
    black = 20, 20, 40
    screen.fill(black)

    #main game loop
    done = 0
    while not done:
        draw_stars(screen, stars, black)
        move_stars(stars)
        draw_stars(screen, stars, white)
        pygame.display.update()
        for e in pygame.event.get():
            if e.type == QUIT or (e.type == KEYUP and e.key == K_ESCAPE):
                done = 1
                break
            elif e.type == MOUSEBUTTONDOWN and e.button == 1:
                WINCENTER[:] = list(e.pos)
        clock.tick(50)


# if python says run, then we should run
if __name__ == '__main__':
    main()
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