On Aug 10, 12:40 am, bratliff <[email protected]> wrote:
> A son of a friend of mine is a Microsoft employee.  He has
> acknowledged several VML bugs in IE8 fixed in IE9 for future release.
> If it is just cosmetic, I am not too concerned.  Does it work in IE7 ?
>
yeah I just made a simple test case and it's a VML bug in IE6, IE7 and
IE8.  I haven't checked the IE9 preview yet.

Here's a 3 point polyline with the problem:
http://www.william-map.com/20100810/1/problem.htm

You can see something strange at the top, so if you make the line 75pt
wide, you can see strange loops:
http://www.william-map.com/20100810/1/exaggerated.htm

Which suggests the problem relates to the default "round" line capping
when there's a 180 degree change in heading:
http://www.william-map.com/20100810/1/fix_miter.htm

To workaround this you can put another vertex so at the turnaround
there's two angles less than 180:
http://www.william-map.com/20100810/1/workaround_round.htm

Here's a demonstration using the V3 polyline:
http://www.william-map.com/20100810/1/test.htm

...

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