PixelCalculator without creating an Overlay

temo · by **temo** » Fri Apr 18, 2008 7:16 pm

Hi...I was wondering if it was possible to create a PixelCalculator object without creating an Overlay.
I am just interested in finding out the xyCoordinates of two long/lat points, but don't want to draw anything.

I keep seeing people telling others to use the PixelCalculator class for xy, but i am not sure how to create one without creating an overlay.

Thanks.

temo · by **temo** » Sun Apr 27, 2008 3:11 am

i came up with rough estimate...the math is probably different from how the official calc does it (its off a little by what appears to be rounding)...anyways it seems sufficient to me and i figured other people may find it useful...also it probably only works in north america (northern/western hemisphere...lol)

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Using java Syntax Highlighting

 
        private void getPointXY(MapView map, Point p, int[] xy){
 
                Point mapCenter = map.getMapCenter();
 
                int mapWidth = map.getWidth();
 
                int longSpan = map.getLongitudeSpan();
 
                xy[0] = (int) (mapWidth*(p.getLongitudeE6()-mapCenter.getLongitudeE6()+longSpan/2.0)/longSpan);
 
                int mapHeight = map.getHeight();        
 
                int latSpan = map.getLatitudeSpan();
 
                xy[1] = (int) (mapHeight*(-p.getLatitudeE6()+mapCenter.getLatitudeE6()+latSpan/2.0)/latSpan);
 
        }
 
Parsed in 0.032 seconds,  using GeSHi 1.0.8.4

PixelCalculator without creating an Overlay

PixelCalculator without creating an Overlay

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