Hello, all!
I'm working on an app that uses circles emanating from points of
interest to show "coverage" for the areas. When two coverage circles
overlap, their opacities combine to occlude the underlying map even
more. For example, let's say I'm using an opacity of 0.25 to draw red
circles. If they overlap a fair amount (such as in a Venn Diagram),
then eventually there's an area at which these circles all intersect
that ends up with an opacity of what seems to be approaching 1.0 (I'm
left with opaque red at this intersection). This is sub-optimal for me,
since I need the map to remain visible beneath the circles.
Is there any way to draw polygons, rectangles, and circles without this
alpha-combining functionality? What I'm attempting to do is to draw all
shapes without borders so that when they are drawn, the resulting shape
has an opacity of 0.25 *throughout* instead of varying opacity.
Interestingly enough, it seems that this is what v2 seemed to do by
default - I've taken a screenshot of a an example of what I'm trying to
do. Note, this is in v2, but my target is v3 -
http://img23.imageshack.us/i/screenshot20110504at655.png/ . Notice how
the intersection of the two red circles is not darker than the
non-intersected portions.
How can this be done in v3? My best guess is to draw the shapes with an
opacity of 1.0 and then change the opacity of the entire overlay to be
0.25, thereby yielding the result I'm looking for. However, I don't
know how to do this... Also, could there be a better way?
Thanks so much, everyone! :)
-Rich
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