I'm running PhlatScript 0.923, Sketchup 7.1.6859 on a Snow Leopard Mac.

Neither the Center Line nor the Fold tool are working. It highlights the edges, but nothing happens when I click.

I looked at the CenterLineTool class and found the problem. It's on Line 50 of the CenterLineTool class, in the mouse handlers:
[pre] def onLButtonDown(flags, x, y, view)
added = false
if (((flags & 1) == 1) && (@ph.do_pick(x, y) > 0))
...
end
view.model.selection.clear if !added
end

The culprit is the check on the flags bitmask:
[pre](flags & 1) == 1[/pre]

This mask never AND's with 1, ever.

If I remove this conditional, the CenterLineTool works.

I cannot find any information on SketchUp's API documentation about the meaning of the bits in this mask, but what I could find is Ruby constants for modifier keys, ie ALT_MODIFIER_MASK.

I don't know what flags & 1 is trying to accomplish, but my guess to what's happening here is – for whatever unholy reason – the flag bitmasks are different on Mac vs Windows. I suspect that's why the Sketchup docs never explicitly define the bitmasks, but do provide constants.

Like I said, I don't know what flags & 1 does, but I suspect this bug could be fixed by replacing it with the appropriate constant for the modifier this code is testing for. Example:
if (flags & ALT_MODIFIER_MASK) && (@ph.do_pick(x, y) > 0)[/pre]

 

rschenk, looks like a discussion has started up on this problem, just in case you want to get in on it:
viewtopic.php?p=19285

 

Thanks you for sharing