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from visual import *
from random import uniform, randint
scene.forward = (-0.25,-0.25,-1)
nboxes = 8
nlinks = 16
maxgrid = 10
# Create some random cylinders:
nodes = []
for t in arange(-pi,pi,2*pi/nboxes):
b = cylinder( pos=(10*sin(t),0,10*cos(t)) )
b.color = b.icolor = (0.5,0.5,1)
height = uniform(0.5,4)
b.axis = (0,height,0)
nodes.append( b )
# Create some random links:
links = []
for l in range(nlinks):
i = randint(0,nboxes-1)
j = randint(0,nboxes-1)
c = curve( ends=[nodes[i].pos,nodes[j].pos], radius=0.2 )
c.red = 0
c.green = uniform(0.3,1)
c.blue = 0
c.pos = c.ends
links.append(c)
# Draw a grid:
for i in range(maxgrid+1):
curve(pos=[(2*i-maxgrid,0,-maxgrid),(2*i-maxgrid,0,maxgrid)], color=color.cyan)
curve(pos=[(-maxgrid,0,2*i-maxgrid),(maxgrid,0,2*i-maxgrid)], color=color.cyan)
box(pos=(0,-0.6,0),width=2*maxgrid,length=2*maxgrid,height=1,color=(0,0,0.1))
# Drag and drop loop
drag = None
while 1:
rate(100)
if scene.mouse.events:
c = scene.mouse.getevent()
if drag and (c.drop or c.click): # drop the selected object
newpos = c.project(normal=scene.up, d=yoffset)+offset
if abs(newpos.x)<=maxgrid and abs(newpos.z)<=maxgrid:
drag.pos = newpos
drag.color = drag.icolor
drag = None
elif c.pick and hasattr(c.pick,"icolor"): # pick up the object
drag = c.pick
drag.color = color.white
yoffset = c.pickpos.y
offset = drag.pos-c.project(normal=scene.up, d=yoffset)
if drag:
newpos = scene.mouse.project(normal=scene.up, d=yoffset)+offset
if abs(newpos.x)<=maxgrid and abs(newpos.z)<=maxgrid:
drag.pos = newpos
for lnk in links: lnk.pos = lnk.ends
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