Hi, I have a question how to repeat the same vpython scripts.
I was implementing physics simulation software with vpython and wxpython and
I wanted to repeat vpython simulation when a button is clicked. The
following is what I tried. This is not runnable because I was using
wxPython, not a Tkinter. But I don't think you would have problem
understanding my intention.
When I first clicked the "Start Simulation", it worked as I expected. But
when I closed the VPython window and clicked again the "Start Simulation", I
didn't see anything. But 'start simulation' and 'end simulation' debug
straings appeared in the command window.
Any ideas what I did wrong?
Thanks in advance.
Young-Jin Lee
# initial review of 1d free fall example
# Button ID
BT_START = 10
from wxPython.wx import *
from wxPython.html import wxHtmlWindow
from visual import *
class CPFreeFall1D_InitialPane( wxHtmlWindow ):
def __init__( self, parent, id, **kwargs ):
wxHtmlWindow.__init__( self, parent, id, **kwargs )
wxButton( self, BT_START, "Start Simulation", wxPoint( 100, 100 ) )
EVT_BUTTON( self, BT_START, self.OnClickStart )
def OnClickStart( self, event ):
# read the configuration file
import ConfigParser
cfg = ConfigParser.ConfigParser()
cfg.read( 'freefall1d.cfg' )
self.startSimulation( cfg ) # When "Start Simulation" button is
clicked, VPython simulatoin starts.
def startSimulation( self, cfg ): # Body of VPython simulation
print 'start simulation'
scene.width = scene.height = 500.
scene.x = scene.y = 0
scene.forward = ( -0.2, -0.5, -1 )
scene.autoscale = 0
scene.userzoom = 0
scene.range = ( 15, 15, 15 )
scene.exit = 0 # only close the simulation window
# start an actual simulation
scene.select()
xmax = 10
dx = xmax / 5
grid = []
gravity = cfg.get( 'Characteristics', 'gravity' )
r = float( cfg.get( 'Characteristics', 'diameter' ) ) / 2
for x in arange( -xmax, xmax+dx, dx ):
grid.append( curve( pos = [(x, 0, -xmax), (x, 0, xmax)],
color = ( .7, .7, .7 ) ) )
for z in arange( -xmax, xmax+dx, dx ):
grid.append( curve( pos = [(-xmax, 0, z), (xmax, 0, z)],
color = (.7, .7, .7) ) )
ball = sphere(pos=(0,8,0), radius=r, color=color.red)
ball.selected = 0
ball.velocity = vector(0,-1,0)
dt = 0.1
ballPosition = []
ballVelocity = []
t = []
currentT = 0
while ball.y > ball.radius:
rate(10)
ball.pos = ball.pos + ball.velocity*dt
ball.velocity.y = ball.velocity.y - float(gravity)*dt
wake = sphere( pos = ball.pos, radius = 0.1, color =
color.blue )
t.append( currentT + dt )
ballPosition.append( ball.pos.y )
ballVelocity.append( ball.velocity.y )
currentT = currentT + dt
print 'end simulation'
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