🚀 go-pugleaf

>>>>> rich@MERL.COM writes:

> I have heard from one of my ex-graduate students that idraw has a
> "known bug" of the following description:

>       ...However, I no longer use
>       idraw, since it sometimes randomly displaces the objects in my figures,
>       so that they are no longer positioned on the grid points.

> (1) Is this a known bug?

Yes. It is not random exactly, it happens when you zoom in and zoom
out again. My guess is that it is results from round off errors in the
scale/translate/rotate transformations.

> (2) Has it been fixed in the most recent release?

I have been wondering about this myself. Since the Unidraw version of
idraw uses a model view concept, where view transforms are done on the
view only the bug should be gone (,... maybe...;-) 

A problem might be that changes to a zoomed view makes the results of
transformations with round-off error transmit to the model.

Don't know if this happens, I don't have a 3.0.1 version of idraw to
experiment with, had to clear my disc space to get room to experiment
with iv 3.1a & 3.1b and gcc

- Steinar