Re: [OpenMap Users] question on drawing an OMCircle over a possibly same colored map region

From: George Uecker <george.uecker_at_dot21rts.com>
Date: Thu, 03 Mar 2005 12:49:11 -0500

Hi Adam,

Have you considered using a semi-transparent fill color?
Semi-transparent colors have an additive effect when stacked, such that
  if you have multiple circles overlaying each other or background areas
of the same color, the intersecting parts will simply be a more opaque
(or more intense) color.

You could also use a different, fully opaque edge color to help
differentiate the circles from the background. Attached is an example
of what I mean, although in this example the background color(s) and the
shape colors are a bit different.

HTH,

George

Adam Russell wrote:
> I have a potential problem in drawing an OMCircle over certain regions
> of a map. There is the potential that part or all of the OMCircle will
> be on top of a region colored with the same color. Ideally what I'd like
> to do is be able to determine the underlying color and then change that
> part of the circle's circumference but this sounds pretty much
> impossible to do given the openmap api as I understand it. Any advice?
> The location of the OMCircles and the same colored regions varies and
> cannot be predicted in any way.
> I'd appreciate any advice that anyone may be able to offer on this.
> Best Regards,
> Adam
>
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Received on Thu Mar 03 2005 - 12:57:01 EST