Re: [Plplot-devel] New cgm driver

[Andrew R. <ar...@ge...>]

>These test results did indicate some colour problems. For example for the
>5th page of x08c there were lots of error messages about:
>
>Problem setting cmap1 in CGM driver
>Problem setting cmap0 in CGM driver.
>
>Also, the gray shading on the 3D shaded plot result seems to be more
>non-uniform (more missing triangles) than usual.  I assume it has something
>to do with the large number of different grey scales in this example.

Actually, I think it has to do with the fact there is no "black" background
yet.

>Andrew, will you try x08c -dev cgm -fam on your system to see if you get the
>same errors for the fifth page?

Yes, I am still to look into that. The PNG driver also trips those errors
for what it is worth, but silently. I don't think it effects the results
though.

>I also noticed background colour problems.

The problem stems from the fact that with CGM files, there is no background
colour as such. It is sort of treated like plotter in effect. Whatever the
background colour on the default viewer is will be the background colour.
There is work-around for this I believe will fix the problem. Basically you
have to put a rectangle of the desired background colour down before you
start any drawing. I will add that feature in my next update.