It seems like OpenMap is defining ellipses differently than you are.
The OpenMap parameters for OMEllipse are the same as for the Java
Ellipse2D object, with the OMEllipse major and minor axis corresponding
to the Ellipse2D width and height.
I think you would get accurate results by setting the your major axis
value to the OMEllipse minor axis (h), your minor axis value to the
OMEllipse major axis (w) and then setting the rotation angle.
- Don
Davidian wrote:
>> If your major axis had the larger value, it looks right to me.
>
> The major axis will always be the larger value as per the definition of
> major axis.
>
>> The rotation is performed around the center point.
>
> Yes, I understand that.
>
>>> It looks like OpenMap's default way of drawing an OMEllipse (i.e., with a
>>> rotation angle of 0.0) is to place the major axis (longer) along the
>>> east/west plane, and the minor axis along the north/south plane.
>
>> Yes.
>
> This is the part that gets me. I'm not sure why, but I thought the
> convention was that the major axis would run north/south by default (i.e.,
> if no rotation angle was applied). Now it seems as if there is no
> convention, which doesn't seem possible.
>
>> What happens if you swap your axis values when you create the OMEllipse?
>
> I'm sure the ellipse would appear correct, visually anyway. My problem is,
> everything is off by 90 degrees when I use the OMEllipse class. I was just
> wondering if anyone has ever brought this up before.
>
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Received on Wed May 28 2008 - 15:45:06 EDT