collide.py

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__author__="karlo"
__date__ ="$Jun 5, 2011 3:54:04 PM$"

from gasp import *

def distance(x1, y1, x2, y2):
    return ((x2 - x1)**2 + (y2 - y1)**2)**0.5

def collide():

    begin_graphics(800, 600, title="Catch", background=color.YELLOW)
    set_speed(120)

    ball1_x = 10
    ball1_y = 300
    ball1 = Circle((ball1_x, ball1_y), 10, filled=True)
    ball1_dx = 4

    ball2_x = 790
    ball2_y = 300
    ball2 = Circle((ball2_x, ball2_y), 10)
    ball2_dx = -4

    while ball1_x < 810:
        ball1_x += ball1_dx
        ball2_x += ball2_dx
        move_to(ball1, (ball1_x, ball1_y))
        move_to(ball2, (ball2_x, ball2_y))
        if distance(ball1_x, ball1_y, ball2_x, ball2_y) <= 20:
            remove_from_screen(ball1)
#            remove_from_screen(ball2)
#            break
        update_when('next_tick')

    sleep(1)
    end_graphics()

if __name__ == "__main__":
    collide()