[ptx] checkerboard behind preview?

[Pablo d'Angelo]

On Tue, 18 Nov 2003, Ed Halley wrote:

> 
> I was just about to see if I could tackle the background of the
> preview.  In keeping with many other image editing programs, I was
> thinking of a gray/gray checkerboard, instead of the current flat black.
> 
> I could make a boring 8x8 pixel checkerboard, but thought it would be
> nice if I could figure out the appropriate coordinates to make each
> check represent a given angle, say, 5 degrees FOV.  This could help the
> user judge what numbers to stuff into the yaw/pitch boxes, as well.

good idea!

you can render a background layer, based on PTools::Transform.
Create an Inverse transfrom from erect -> [pano output projection].
specify the right size for the pano projection (so that one pixel is in
5°deg steps on the erect) and calculate the output pixels.
Probably you have to adjust either the input or the output coordinated,
depending if you use Transform::transformImgCoord or Transform::transform

ciao
  Pablo
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