Don - I found the problem: looks like I was calculating an incorrect
mouse-click location :( So it appears that the code I posted here was
OK. I guess inverse() works fine.
Greg
> Don
>
> I wasn't aware what the scale limit was (I knew it had one). It
> could
> be the problem - I will check. It should have put me in the
> southwestern US area, near San Diego, but as you can see it is
> jumping to the southern hemisphere somewhere around
> Venezuela/Columbia.
>
> Will try the scale correction and post the results - Thanks!
> GB
>
>
> > Hi Greg,
> >
> > For me, that height and width for a screen won't allow that scale
>
> > (the scale gets limited to 1:210,474,240, if you try to zoom out
>
> > further, the projection won't allow it because the whole earth is
>
> > covered at the limit), but the coordinates for that mouse
> position
> >
> > seem to be on target. What were you expecting?
> >
> > - Don
> >
> >
> > On Feb 10, 2006, at 11:08 PM, Greg Bulla wrote:
> >
> > > HI - I'm trying to obtain a lat/lon position from screen
> > coordinates,
> > > but the return values are way off from what I'm expecting. I'm
> > using
> > > the Mercator projection.
> > >
> > > Below is a code snippet. I'm passing in the following values:
> > x=459
> > > y=319 centerLat=33.2 centerLon=-116.0 projectionType=mercator
> > > width=620 height=438 scale=1.0E9
> > >
> > > It is returning lat=-20.562952 and new lon=-32.1875.
> > >
> > > Perhaps the inverse method doesn't work the way I expected.
> Any
> > > ideas? Thanks,
> > >
> > > Greg
> > >
> > > ------------------------------
> > >
> > > private LatLonPoint getLatLonFromScreenCoordinates(int x, int
> y,
> > > double centerLat, double centerLon, String projectionType, int
> > width,
> > > int height, float scale)
> > > {
> > > LatLonPoint centerLatLonPoint = new LatLonPoint(centerLat,
> > > centerLon);
> > > Projection projection = null;
> > >
> > > if (projectionType.equalsIgnoreCase("Mercator"))
> > > {
> > > projection = new Mercator(centerLatLonPoint, scale,
> width,
> > > height);
> > > return projection.inverse(x, y);
> > > }
> > > .
> > > .
> > > .
> > >
> > > -----------------------
> > >
> > > --
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>
> > > openmap-users"]
> >
> >
>
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Received on Mon Feb 13 2006 - 13:22:58 EST