WorldViz User Forum - Mouse-drag an object

Here is a sample script that should work with 2.5
Code:
import viz

viz.go()



DRAG_TIMER = 1



balls = []



#Add 3 balls and place them in front of the user

for x in range(3):

        ball = viz.add('ball.wrl')

        ball.translate(x-1,1.7,4)

        balls.append(ball)

        

#Add a ground

ground = viz.add('tut_ground.wrl')

ground.disable(viz.PICKING)



#Set background color

viz.clearcolor(viz.SKYBLUE)



#Disable mouse navigation

viz.mouse(0)



#The object that will be dragged

dragObject = None



def BeginDrag():

        global dragObject

        #Pick an object

        info = viz.pick(1)

        #Make sure object is one of the balls

        if info.object in balls:

                #Set the drag object

                dragObject = info.object

                dragObject.offset = vizmat.Vector(dragObject.get(viz.POSITION)) - info.intersectPoint

                dragObject.dist = vizmat.Distance(viz.get(viz.HEAD_POS),info.intersectPoint)

                viz.starttimer(DRAG_TIMER,0,viz.FOREVER)



vizact.onmousedown(viz.MOUSEBUTTON_LEFT,BeginDrag)



def EndDrag():

        global dragObject

        #Stop dragging

        dragObject = None

        viz.killtimer(DRAG_TIMER)



vizact.onmouseup(viz.MOUSEBUTTON_LEFT,EndDrag)



def onTimer(num):

        if num == DRAG_TIMER:

                #Move the object based on mouse movement

                line = viz.screentoworld(viz.mousepos())

                begin = line[:3]

                end = line[3:]

                dir = vizmat.Vector(end) - begin

                dir.normalize()

                dir *= dragObject.dist

                pos = vizmat.Vector(begin) + dir + dragObject.offset

                dragObject.translate(pos.get())



viz.callback(viz.TIMER_EVENT,onTimer)