Re: [femm] Re: Grid alignment in reopened files

[David Meeker <dmeeker@xxxxxxxx>]

dartagnan1212 wrote:

> Hello Keith,
>
> Perhaps I'm still missing something here. I created the files
> without changing the defaults, except to specify a centimeter scale. 
> A new project starts with the default set to inches, but when I open
> a saved file, the cm. scale is preserved. All seems fine and dandy
> except the grid's relationship to my points is not preserved. For
> example, on the one I rechecked last night, the grid looked like I
> was zoomed way in, but the drawing was full screen, like I was zoomed
> normal.
>
> Is is just me? Does this not happen to you when you save and reopen
> projects?
>
> Thanks,
>
> Bill
When the program is first started or when Files|New is selected, the 
program defaults to the grid size specified in the Preferences. 

View and grid setting are not saved as part of a data file. When a file 
is opened from disk, the view is zoomed and centered so that the entire 
geometry is displayed on the screen with the biggest possible 
resolution. The grid size is then picked to be the "most appropriate" 
power of 10 relative to the dimensions of the part being displayed. For 
example, if your geometry were contained in a 1" by 1" square, the grid 
size would be selected as 0.1"

There is no offset to the grid points. If we use g to represent the 
grid spacing, grid points would be located at (i*g,j*g) where i and j 
are any integers.

The default Preference for grid spacing is 0.25". I'd guess that you 
just need to specify 0.25" as the grid spacing after you open a new 
file. Either that, or select the grid setting so that the points 
defined by (i*g,j*g) coincide with your geometry (if you are lucky 
enough to have a geometry which is that regular).

Dave.
--
David Meeker
email: dmeeker@xxxxxxxx
www: http://femm.berlios.de/dmeeker