Re: gEDA-user: pcb program

[Seb James <seb@xxxxxxxxxxxx>]

On Thu, 2007-03-08 at 16:19 -0800, Harry Eaton wrote:
> I noticed the problem is occuring during an extremely
> high zoom in. pcb used to have code to clip the zoomed
> lines to the screen in order to prevent integer
> overflow. With the advent of hid that was removed and
> now zooming in runs the risk of overflow with its
> unlimited zoom capability.
> 
> It's very severe with rats because all rats seem to be
> being drawn, even those that should not be visible at
> all - thus virtually all of them are overflowing.

So a possible workaround would be to get myself a 64 bit computer?

> First recommendation is don't zoom in so close with
> rats on.
> 
> Second thing is we should fix the drawing so that it
> only draws the visible rats. I thought it already did
> that.
>
> Third is it's time to put proper clipping into the hid
> drawing routines.

Sounds like DJ has done some/all of this work now, though it doesn't
seem to be available currently to anonymous sourceforge cvs users.

> Interesting polygons are the only structures being
> properly clipped at the moment.
> 
> The polygon clipping is "slow" when the polygons have
> many thousands of verticies. I'll be improving this
> situation this spring by (a) reducing a circle's
> vertice count to 20 from 36 (this is still more than
> many commercial packages). (b) cacheing the "diced"
> polygons used for rendering and (c) Modifying the file
> format to store the clipped polygon data so that file
> loading is fast if the clip information is saved.




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