[Drawkit] Changing margins does not shift drawing objects

[Dick Applebaum]

Brad,

I assume by document, you mean the grid layer.

I agree with you-- everything should scale/reposition on a relative  
basis to the original size/position (just like in a photograph).

I don't know if this will help (or even if it is possible) but, from a  
logical standpoint couldn't you programatically:

1) group all the objects together including the document layer as just  
another object
2) convert this to a shape
3) resize the shape as desired
4) convert back to a group object
5) ungroup

Again, I don't know if DrawKit permits manipulation of the document  
layer in this way... if not, you could create a background object that  
serves as a document layer & manipulate is as above.

HTH

Dick


On Jul 8, 2008, at 9:14 AM, Brad Larson wrote:

> I just added the ability to resize the document workspace to our  
> drawing client, and in our application I wanted the margins to scale  
> as a percentage of the drawing working area.  I noticed that when  
> the margins changed, the objects within the drawing did not shift to  
> match, causing items that were drawn at the left edge of the working  
> area to fall off the drawing and into the margins.
>
> It seems like you'd want the objects to stay at their same relative  
> positions in the drawing, and be shifted appropriately by the  
> changing margins, but I'm not quite sure where in DrawKit you would  
> handle this.  DKDrawableObjects are drawn by specifying their  
> absolute Quartz position (using DKGrid's pointForGridLocation:),  
> which includes the margin origin in the initial placement  
> calculation.  You'd need to recalculate the Quartz positions of all  
> objects using the difference between the old and new margins to move  
> them properly.  DKObjectOwnerLayers might handle this, by responding  
> to the kDKDrawingWillChangeMargins and  kDKDrawingDidChangeMargins  
> notifications and adjusting all their internal objects to match.
>
> For now, I can do this manually, but it would be nice for this to be  
> handled internally.
>
> ______________________
> Brad Larson
> SonoPlot, Inc.
> 3030 Laura Lane, Suite 120
> Middleton, WI 53562
>
>
>
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