Re: logic problem

[Dov Grobgeld <dov imagic weizmann ac il>]

Check out the libgnomecanvas. It has a concept of a world coordinate
system that is mapped to the widget, just like in your problem. On
the canvas you can place various canvas items, among them rectangles,
which is what you need for your problem. You can then change the zoom
factor in callbacks.

Regards,
Dov

On Mon, Mar 31, 2003 at 01:43:37PM -0600, Billy Patton wrote:
> I only get to work on gtk for a few hours a week.
> Here's my problem.
> 
> My test data consists of rectangles.
> I need to scale this data to make it larger and smaller
> and to pan around.
> 
> So, to the data I apply a scale. starting scale is to make
> all data fit within the screen.
> I apply a shiftX and a shiftY, for panning.
> 
> To each coord I apply a scale,shiftX/Y
> 
> The Y value has to be inverted to the 0,0 is in left lower corner.
> 
> 
> I'm using gtk2.0.6 on a solaris 7 box, with gcc 2.8.1
> 
> I have the following functions to assist me with
> gc2wc  -> graphics to world coords
> wc2gc  -> world to graphics coords
> 
> 
> Any assistance with the logic would be appreciated :)
> 
> Any source examples would be helpful.
> I'm not a student, I'm a perl person by trade :)
> 
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