package hirondelle.starfield.projection; /** Half-sky projection, equal areas. <P>This is the projection used in the 1979 paper by McKinley and Doherty, where the projection was not referred to with a specific name. */ final class MckinleyProjection implements Projection { @Override public Coords project(double aThetaprime, double aPhi, double aScale, Coords aCenter) { Coords result = new Coords(); double r = Math.sqrt(1-Math.cos(aThetaprime)); double deltax = aScale * r * Math.cos(aPhi); double deltay = aScale * r * Math.sin(aPhi); result.X = aCenter.X + deltax; result.Y = aCenter.Y + deltay; return result; } }