Hi all, I've run into a problem while porting GerbView to GAL that doesn't have an obvious best solution to me, so I thought I would ask those with more knowledge of the GAL for ideas.
Gerber files rely on a fixed draw order. This becomes important when some draw objects in the file are negative, because they must "unpaint" things that appeared earlier in the file, but not things later in the file. My initial approach to the GAL port was to create a painter that paints each GERBER_DRAW_ITEM, and add all GERBER_DRAW_ITEMS to the VIEW upon file load. This works, as long as there aren't negative objects in the Gerber file. Since VIEW calls upon objects to be painted in an order that doesn't necessarily have anything to do with the order they were added to the VIEW (because of being stored in an R-Tree), negative objects don't properly mask positive ones. One solution would be to just add entire Gerber images to the VIEW instead of the draw objects within the images, and then the drawing code could draw all items at once and make sure to do it in the right order, but this seems like an ugly hack and I think it would bypass the off-screen object culling and possibly cause other problems / make some features harder to implement. Another would be to implement some sort of render order sorting inside VIEW, but I haven't looked in to that much yet, so I'm not sure how complicated it would be. Does anyone have suggestions for this problem? Thanks, Jon
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