Re: [unrev-II] More TouchGraph2

From: Alex Shapiro (
Date: Mon Sep 10 2001 - 22:55:55 PDT

  • Next message: Bernard Vatant: "[unrev-II] Tr: [ontoweb-language-sig] Comparison of semantic markup languages"

    >Looking at the tgLivingThing gif, one can begin to make the case that
    >Bernard did earlier: rollover popup of edge properties. That's tricky,
    >particularly with the curved edges -- will be tricky (methinks) to figure
    >out the bounding box for mouse detection. Worth a try, however.

    Nah-hah, that's the cool part. Curved edges do not pause a problem, and
    you know why? Because in terms of real coordinates, the edges are not
    curved. They just appear curved because they are warped by lenses.

    A formula for computing the distance from point (P) to a line (L) is
    simple, and it is also simple to find the point where a perpendicular line
    from P to L would cross L. So now, the only tricky part is converting back
    to visual coordinates, and determining when P is close enough to <P
    intersect L> to warrant an edge over trigger.

    Neat huh? And I guess that this feature can be implemented right now. For
    some reason, before, I thought that it would have to wait for edges to
    belong to nodes, rather then be out on their own. The other cool thing, is
    that once edges have mouse-over sensing, then one can implement all kinds
    of interfaces to manipulate them.... Drag from an edge to a node to switch
    endpoint? A scrollbar to change edge tension? Lots of things.


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