Dear All!
VPython is really agreat library that I love very much. But now I tried
to make points dragable in a seemingly very simple way:
from visual import *
def Vmainloop():
while 1:
if scene.mouse.events:
ev=scene.mouse.getevent()
if ev.drag: VdragEvent(scene.mouse.pos,scene.mouse.pick)
def VdragEvent(pos,obj): obj.pos=pos
def makePoint(pos): return sphere(pos=pos,radius=0.2,color=color.red)
[A,B,C]=[makePoint((-3,1,1)),makePoint((3,1,1)),makePoint((0,5,1))]
scene.autoscale=0
Vmainloop()
However, this does not work. The points are draggable, but only a very
small distance. After that, no further events are triggered. Obviously,
after dragging it a bit, it is no longer picked. But this is strange
because the position has been updated.
Does anybody have a hint on this?
Reinhard Oldenburg
--
Prof. Dr. Reinhard Oldenburg
Goethe-Universität Frankfurt
Institut für Didaktik der Mathematik und Informatik
Senckenberganlage 9
D-60325 Frankfurt/Main
Telefon +49 (0)69 798 23770
Telefax +49 (0)69 798 22553
E-Mail old...@ma...
WWW www.math.uni-frankfurt.de/~oldenbur
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