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Bounce.py
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Bounce.py
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from vpython import *
scene.caption = """Right button drag or Ctrl-drag to rotate "camera" to view scene.
To zoom, drag with middle button or Alt/Option depressed, or use scroll wheel.
On a two-button mouse, middle is left + right.
Touch screen: pinch/extend to zoom, swipe or two-finger rotate."""
#scene.title = "<script src='https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.2/MathJax.js?config=TeX-MML-AM_CHTML'></script>"
#scene.title += "\\(\\dfrac {5} {7} \\)"
#print(scene.title)
side = 4.0
thk = 0.3
s2 = 2*side - thk
s3 = 2*side + thk
wallR = box (pos=vector( side, 0, 0), size=vector(thk, s2, s3), color = color.red)
wallL = box (pos=vector(-side, 0, 0), size=vector(thk, s2, s3), color = color.red)
wallB = box (pos=vector(0, -side, 0), size=vector(s3, thk, s3), color = color.blue)
wallT = box (pos=vector(0, side, 0), size=vector(s3, thk, s3), color = color.blue)
wallBK = box(pos=vector(0, 0, -side), size=vector(s2, s2, thk), color = color.gray(0.7))
ball = sphere (pos=vec(1,1.5,0), color = color.green, radius = 0.4, make_trail=True, retain=200)
ball.mass = 1.0
ball.p = vector (-0.15, -0.23, +0.27)
side = side - thk*0.5 - ball.radius
dt = 0.3
while True:
rate(200)
ball.pos = ball.pos + (ball.p/ball.mass)*dt
if not (side > ball.pos.x > -side):
ball.p.x = -ball.p.x
if not (side > ball.pos.y > -side):
ball.p.y = -ball.p.y
if not (side > ball.pos.z > -side):
ball.p.z = -ball.p.z