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add 'project' utility function to project to double array

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This commit is contained in:
Hannes Janetzek 2013-05-30 10:04:45 +02:00
parent e957b178ad
commit 5ab4ce50af
1 changed files with 8 additions and 0 deletions
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8
src/org/oscim/core/MercatorProjection.java
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@ -103,6 +103,14 @@ public final class MercatorProjection {
return reuse; return reuse;
} }
public static void project(GeoPoint p, double[] out, int pos) {
out[pos * 2] = ((p.longitudeE6 / 1E6) + 180.0) / 360.0;
double sinLatitude = Math.sin((p.latitudeE6 / 1E6) * (Math.PI / 180.0));
out[pos * 2 +1] = 0.5 - Math.log((1.0 + sinLatitude) / (1.0 - sinLatitude)) / (4.0 * Math.PI);
}
/** /**
* @param latitude * @param latitude
* the latitude value which should be checked. * the latitude value which should be checked.