Coordinates change

[jincheker]

Hi, I try to make some program that could add on-the-fly objects by following the path of mouse movement.

I use code like this

PointBall = viz.add('ball.wrl')
PointBall.color(viz.RED)
PointBall.setPosition(e.x , e.y,2)

where variable "e" is obtained by left-button mouse event.

I also make PivotNavigate by mouse on, but disabled left-button function part.

The problem is: when I move the mouse on the screen, those generated objects do not follow the trajectory of the mouse cursor, there are some offset.

How can I neglect this, and if I zoom in or zoom out the screen, does this method still apply?

Thanks

[Jeff]

Try using the <window>.screenToWorld command. Is this what you're looking for?

import viz
import vizact
viz.go()

viz.link( viz.Mouse,viz.addTexQuad(viz.SCREEN,texture=viz.add('crosshair.png')) )

def addBall():
	
	ball = viz.addChild('ball.wrl',cache=viz.CACHE_CLONE)
	line = viz.MainWindow.screenToWorld(viz.mouse.getPosition())
	pos = vizmat.MoveAlongVector(line.begin,line.dir,10)
	ball.setPosition(pos)
	
vizact.onmousedown(viz.MOUSEBUTTON_LEFT,addBall)

viz.mouse(viz.OFF)

[jincheker]

Thanks Jeff, That works