VPython - example - 模拟球在两板之间的碰撞

本作品采用知识共享署名-非商业性使用-相同方式共享 3.0 Unported许可协议进行许可。允许非商业转载，但应注明作者及出处。

作者：liuyuan_jq

2011-04-10

#########################################
# Import the library(s)
#########################################
from visual import *

##########################################
# Create Wall(s)
##########################################
side=4.0
thk=0.3

wallR = box (pos=vector( side, 0, 0), length=thk,
             height=2*side, width=2*side, color = color.red)
wallL = box (pos=vector(-side, 0, 0), length=thk,
             height=2*side, width=2*side, color = color.red)

##########################################
# Create Ball(s)
##########################################
ball_radius=1.0
maxpos=side-thk/2-ball_radius
maxv=2.0

ball = sphere(color = color.green, radius = ball_radius)
ball.velocity = vector(2,0,0)


##########################################
# Time loop for moving Ball(s)
###########################################
timestep = 0.05

while True:
    # Set number of times loop is repeated per second
    rate(100)

    # Move ball(s)
    ball.pos = ball.pos + ball.velocity*timestep

    #check for collisions with the walls
    #right wall
    if ball.pos.x > maxpos:
        ball.velocity.x = -ball.velocity.x #reflect velocity
        ball.pos.x=2*maxpos-ball.pos.x     #reflect position
    #left wall
    if ball.pos.x < -maxpos:
        ball.velocity.x = -ball.velocity.x
        ball.pos.x=-2*maxpos-ball.pos.x

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