As part of an app I'm writing, I need users to be able to manipulate a
drawing of a graph: Specifically, I have a bunch of circles ("nodes")
connected to each other by line segments ("edges"). Users can drag the
nodes around within a fixed area (this part works), but I need to stop them
from making the edges intersect each other (except where they meet at the
nodes).
I tried to do this using MovieClip.hitTest (each edge is its own MovieClip,
and I know the coordinates of all the nodes) but it didn't work. I am sure
there is a bug in my code, which I need to find.
Even if I fix it, however, the stupid algorithm that goes through every node
and checks if it hits any edge in the obvious (2 nested for loops) way is
horribly inefficient -- I probably need to do the math myself rather than
relying on hitTest. The number of nodes is user-configurable so even if I
get the stupid algorithm to work on my baby test case, I am worried that it
won't scale.
It occurred to me that possibly hitTest doesn't work to check whether a
point intersects with a clip that has strokes but no fills (ie my edges)...
Does hitTest use the pixels of strokes or does it only use the insides of
fills as the area it checks the test point against?
Millie Niss
[EMAIL PROTECTED]
http://www.sporkworld.org
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