I'm writing an NCSA image map editor. I've got an ImageMorph holding the image, and to it I add Morphs for each entry in the map file. Thus when you're editing the map you see polygons, rectangles, circles overlaid on the image. All nice and neat.

So I realised that you will want to know what region points to what URL, so I thought I'd use a balloon text. It was trivial to do this for EllipseMorphs and BorderedMorphs (for the circle & rect entries, respectively, of course). But I found that my polygonal regions don't work quite as nicely. Each ImageMapEntry has an #asMorph, and ImageMapPolygonEntry>>asMorph looks like this:

asMorph
	| p |
	p := PolygonMorph
		vertices: self points
		color: Color transparent
		borderWidth: 1
		borderColor: Color black.
	p setBalloonText: self targetUri asString.
	^ p.

When I hover the mouse within the region though I don't see the balloon text. It's only when I hover the mouse over the lines in the polygon (the borders of the region, if you like) that I see the balloon text.

Thus my question: How can I have the balloon text show up when the mouse hovers anywhere within the bounds of the polygon?

I've tried searching, and got as far as Morph>>handleMouseEnter: which calls HandMorph>>triggerBalloonFor:after - I thought perhaps PolygonMorph overrode something to make mouse hover balloon texts behave the way they do, but I couldn't find anything.

frank


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