Topic: Viewport following other viewport

[Jeroen]

Would it be possible in AutoLisp/VisualLisp to create a routine which controls a viewport-follow in modelspace?
Let me explain:
The main viewport shows the complete drawing. A smaller viewport on top, shows the gird-numbers of this drawing. When I zoom in on the main viewport, the viewscale and position of the top-viewport changes and shows the grid-numbers of the drawing. When I pan, the top-viewport also pans. I want to use this to keep track of my position in a drawing when I zoom in in the main viewport and the gridnumbers are out of screen. They stay visible in the top viewport. (see attatchment for an example)
My guess, if it is possible, it has to be done with reactors, but I would like to know your thoughts...
I am open for suggestions and tips.

[Tharwat]

maybe the command call if you have the  Express tools installed vpsync

[Jeroen]

VPSYNC and ALIGNSPACE are helpfull, but they only work in paperspace...

[RolandOrzabal]

Similar to this :
  Pan in two MS viewports at the same time

[Jeroen]

Could it be that simple?
I am going to experiment with this. Thanks nod684 & tarwat.

[RolandOrzabal]

Thanks to Mircea for helping me on this

[CAB]

I don't think it will be that easy but close. The problem as I see it is that your focus (zoom center) in the top viewport is the horizontal center of the bubbles
and not the center of the viewport.

This code may be of some use to your as well:
http://www.theswamp.org/index.php?topic=18143.msg258985#msg258985

[Jeroen]

I tried to figure out the zoom-factor, but no result yet. Panning is 'easy'.