Hello, I and doing a ball bounce project for Vpython and I am trying run the program I wrote. I keep getting an invalid syntax error, but I am unable to find any. Please help.
from visual import*
wallA = box(pos=vector(0,6,0), size=vector(12.1,0.2,12.1), color=color.red)
wallB = box(pos=vector(0,-6,0), size=vector(12.1,0.2,12.1), color=color.green)
wallC = box(pos=vector(6,0,0), size=vector(0.2,12.1,12.1), color=color.yellow)
wallD = box(pos=vector(-6,0,0), size=vector(0.2,12.1,12.1), color=color.yellow)
wallE = box(pos=vector(0,0,-6), size=vector(12.1,12.1,0.2), color=color.yellow)
ball=sphere(pos=vector(0,0,0), radius=0.20, color=color.white)
ball.vel=vector(1.5,-.9,-1.9)
vscale=3.0
dt=0.01
velarrow=arrow(pos=ball.pos, axis=ball.vel, color=color.blue)
ball.trail=curve(pos=[ball.pos], color=color.white)
t=0
scene.autoscale=false
while t<10:
rate(1/dt)
t=t+dt
if ((ball.pos.y-ball.radius+ball.vel.y*dt)<wallB.pos.y+0.5*wallB.height):
ddt=(wallB.pos.y+0.5*wallB.height-ball.pos.y+ball.radius)/ball.vel.y
ball.pos=ball.pos+ball.vel*ddt
ball.trail.append(ball.pos)
ball.vel.y=-ball.vel.y
ball.pos=ball.pos+ball.vel*(dt-ddt)
else:
ball.pos=ball.pos+ball.vel*dt
if ((ball.pos.y+ball.radius+ball.vel.y*dt)>wallA.pos.y-0.5*wallA.height):
ddt=(wallA.pos.y-0.5*wallA.height-ball.pos.y-ball.radius)/ball.vel.y
ball.pos=ball.pos+ball.vel*ddt
ball.trail.append(ball.pos)
ball.vel.y=-ball.vel.y
ball.pos=ball.pos+ball.vel*(dt-ddt)
else:
ball.pos=ball.pos+ball.vel*dt
if ((ball.pos.x+ball.radius+ball.vel.x*dt)>wallC.pos.x-0.5*wallC.length):
ddt=(wallC.pos.x-0.5*wallC.length-ball.pos.x-ball.radius)/ball.vel.x
ball.pos=ball.pos+ball.vel*ddt
ball.trail.append(ball.pos)
ball.vel.x=-ball.vel.x
ball.pos=ball.pos+ball.vel*(dt-ddt)
else:
ball.pos=ball.pos+ball.vel*dt
if ((ball.pos.x-ball.radius+ball.vel.x*dt)<wallD.pos.x+0.5*wallD.length):
ddt=(wallD.pos.x+0.5*wallD.length-ball.pos.x+ball.radius)/ball.vel.x
ball.pos=ball.pos+ball.vel*ddt
ball.trail.append(ball.pos)
ball.vel.x=-ball.vel.x
ball.pos=ball.pos+ball.vel*(dt-ddt)
else:
ball.pos=ball.pos+ball.vel*dt
if ((ball.pos.z-ball.radius+ball.vel.z*dt)<wallE.pos.z+0.5*wallE.width):
ddt=(wallE.pos.z+0.5*wallE.width-ball.pos.z+ball.radius)/ball.vel.z
ball.pos=ball.pos+ball.vel*ddt
ball.trail.append(ball.pos)
ball.vel.z=-ball.vel.z
ball.pos=ball.pos+ball.vel*(dt-ddt)
else:
ball.pos=ball.pos+ball.vel*dt
if ((ball.pos.z+ball.radius+ball.vel.z*dt)>(-wallE.pos.z)-0.5*wallE.width):
ddt=((-wallE.pos.z)-0.5*wallE.width-ball.pos.z-ball.radius)/ball.vel.z
ball.pos=ball.pos+ball.vel*ddt
ball.trail.append(ball.pos)
ball.vel.z=-ball.vel.z
ball.pos=ball.pos+ball.vel*(dt-ddt)
else:
ball.pos=ball.pos+ball.vel*dt
ball.pos=ball.pos+ball.vel*dt
velarrow.pos=ball.pos
velarrow.axis=ball.vel
ball.trail.append(ball.pos)
print "End of program. Ending time is ", t,"seconds."
print "Final Position of ball is ", ball.pos,"."
