RE: [OpenMap Users] Box shape around OMCircle during selection

From: Alex Yeo <>
Date: Fri, 13 Oct 2006 11:49:42 +0800

Hi Don,

I have implemented the guides that were provided below, but I am not clear how to "modify your class to paint that OMRactangle in the paint() method" since OMRect does not provide/inherit any paint() method.

Thanks in advance.


-----Original Message-----
From: Don Dietrick []
Sent: 11 October 2006 00:00
To: Alex Yeo
Cc: openMap
Subject: Re: [OpenMap Users] Box shape around OMCircle during selection

Hi Alex,

You could extend OMCircle to create a class that, after generate
(Projection) is called, fetches the bounding box around the shape in
the OMGraphic, and creates an OMRectangle out of those parameters.
Note that the rectangle will be defined in pixel space. If you want
to have the rectangle defined in coordinate space, you could probably
take the pixel extents of the first rectangle, inverse project them
using the Projection object, and then create a lat/lon OMRectangle.
You'd have to call generate(Projection) on that rectangle, though,
and modify your class to paint that OMRactangle in the paint() method.

Hope this helps,


On Oct 10, 2006, at 4:08 AM, Alex Yeo wrote:

> Hi,
> I have created an OMGraphicList consisting of an OMCircle and an
> OMText. My intent is to create a box around the selected OMCircle
> (much like when an OMRaster graphic is selected) but not the OMText.
> Could anyone please provide a hint to how this is possible? Does it
> have anything to do with the createShape method in the OMGraphic
> class?
> Cheers.
> Alex

Don Dietrick,
BBN Technologies, Cambridge, MA

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Received on Thu Oct 12 2006 - 23:52:46 EDT

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