Re: gEDA-user: final modification

[Ethan Swint <eswint.ramu@xxxxxxxxxxx>]

He may mean to add a "negative" polygon, which removes copper present 
within the polygon, instead of a "positive" polygon, which fills areas 
within the polygon with copper.  The last polygon constructed has the 
final say over whether or not a given point has copper.  This is 
standard practice in mechanical CAD packages - which also provide 
several boolean operations to overlapping geometries - AND, OR, XOR, 
etc. - which then generate a consolidated geometrical object (in the 
case of an AND or OR) or multiple objects (in the case of an XOR). 

This would be a wonderful feature in PCB, but I'm sure it would take a 
fair effort in the generation of gerber files.

-Ethan

Duncan Drennan wrote:
>> And how do I remove copper ? I know how to add copper, but not how to
>> remove !
>>     
>
> I don't really understand what you mean. Do you mean delete lines and
> polygons? Just hold the pointer over what you want to delete and then
> press delete.
>
> If you want to delete whole selections, then select what you want to
> delete, type ":" and then "delete" and press enter. Alternatively
> select it, then press CTRL-x (cut to buffer) and the ESC.
>
>
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>
>   


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