Re: gEDA-user: Changing grids in pcb

[Steven Michalske <smichalske@xxxxxxxxx>]

On Jun 29, 2009, at 6:28 PM, DJ Delorie wrote:

>
>> Wouldn't you just use set grid with the -+ for increment and process
>> units?
>
> No.  If you had a list of grid settings you used, then +- means
> stepping through the list, not arithmetic changes.  Consider my grid
> choices:
>
>    {  "0.1 mil" checked=gridsize,10 SetUnits(mil) SetValue(Grid,10)}
>    {  "1 mil"   checked=gridsize,100 SetUnits(mil) SetValue(Grid, 
> 100) an={"G1" "<Keys>g1"}}
>    {  "5 mil"   checked=gridsize,500 SetUnits(mil) SetValue(Grid, 
> 500) an={"G2" "<Keys>g2"}}
>    {  "6.25 mil" checked=gridsize,625 SetUnits(mil) SetValue(Grid, 
> 625) an={"G3" "<Keys>g3"}}
>    { "10 mil"   checked=gridsize,1000 SetUnits(mil) SetValue(Grid, 
> 1000) an={"G4" "<Keys>g4"}}
>    { "12.5 mil" checked=gridsize,1250 SetUnits(mil) SetValue(Grid, 
> 1250) an={"G5" "<Keys>g5"}}
>    { "25 mil"   checked=gridsize,2500 SetUnits(mil) SetValue(Grid, 
> 2500) an={"G6" "<Keys>g6"}}
>    {" 50 mil"   checked=gridsize,5000 SetUnits(mil) SetValue(Grid, 
> 5000) an={"G7" "<Keys>g7"}}
>    {"100 mil"   checked=gridsize,10000 SetUnits(mil) SetValue(Grid, 
> 10000) an={"G8" "<Keys>g8"}}
>
> There's no math that will get you through that list reliably.
>
> Plus, the other problem is changing the mapped actions according to
> the inch/mm setting.
>

I Must have not been clear,  I did not mean to do math to set grid  
sizes,  but only to add one action that uses our standard  +/- value,  
unit  notation,
as described at the beginning of Appendix F

not to have three new actions.

But i think i see where your coming from, up is the next larger and  
down is the next smaller grid size in the list, I had read up/down as  
increment/decrement




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