Re: Getting the middle of an object to snap to grid - how?

[Arv Evans <arvid evans gmail com>]

Hello

One reason for having resistors, and other electronic components, snap to the grid is to make it easy to snap a connecting line or component to the end of that resistor.  For this reason it makes more sense for the resistor ends to snap to the grid than to have it's center snap to the grid.  One exception is when making a variable resistor using American drawing method where an arrowed line connects to the side of a resistor at mid-point.  In this case one has to live with the arrowed tap line snapping to the center point, or make the grid field fine enough that the arrowed line can snap to a point along one side of the resistor's zig-zag line.

       

Arv K7HKL
_._


On 12/28/2010 03:05 PM, Michael Ross wrote:

If I place a resistor, and then a zig zag line, then I move an end of the zzline near an end point of the resistor the resistor get a red outline indicating there is a connection between the "grips,"  if I let the line go while the red outline is present then when I move the resistor the line tracks it.  If I move the line the resistor does not track the line.

The four extents for the resistor symbol snap to the grid.  If you want the center of the resistor to snap exactly just so to the grid, you will have to size the grid so that when you place a corner the leg of the resistor is on a grid line.  

Sorry you don't like this functionality, but it makes sense to me, the grid is essentially arbitrary so there is no particular reason why the symbols should be constrained to it.   If you really need it to be just so then you can control the size and shape of the symbol and grid to produce the result you are after.  I prefer the more general solution that is implemented where any symbol of any size has connection points to which a line will glom onto it and move with the symbol.

If you can make a good case for the function you want, then perhaps the developers will be able to implement it.  or you can implement it yourself.  This is free open source software so you can learn to program it to do as you wish.

On Tue, Dec 28, 2010 at 4:49 PM, Chris G <cl isbd net> wrote:

I'm finding some of the component objects in dia (like the resistor
objects) very annoying to use because the centre of the the object
doesn't snap to grid.

I.e. if you get a resistor and shrink it to be fairly small then it's
the top edge of the resistor that snaps to the grid which is quite
useless when you have circuit wired on the grid as you can't connect the
wires to the resistor.

Is there any way to change the resistor (and other object's) properties
so that the centre of the object snaps to the grid?

--
Chris Green
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