[Drawkit] zoom to bounding box

[Michael Caron]

Hi Graham,

I've been looking through the DrawKit code to figure out how to zoom  
to a bounding box, or perhaps crop the drawing to the bounding box of  
the drawable objects.

There's the DKDrawableObject class method,

+ (NSRect) unionOfBoundsOfDrawablesInArray:(NSArray*) array;

and the scrollToRect:(NSRect)r method on DKDrawing, but I haven't  
found anything that would zoom to a box. Glad to add it, but being new  
to the framework I don't want to do something that's already done in a  
different way.

For a use case, consider a bounding box on a group of objects with top  
left corner at (110, 130) and bottom right corner at (300, 390). so  
everything to the left of 110 on the x-axis and everything above 130  
on the y axis (in a flipped coordinate system), is blank. I'd like to  
zoom to the bounding box so that the drawing itself is not resized,  
but the scale is set appropriately so the object collection is nicely  
centered in the view.

Any tips?


Michael
------------------------------------------------
michael.r.caron at gmail.com
http://techrad.wordpress.com
http://mrcaron.wordpress.com

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