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make Lagrange projection extendable

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actually this atan2 was really bizzare in the first place.  I must have seen the arctangent of a fraction in some book somewhere and just assumed it was supposed to be fully signed.
This commit is contained in:
Justin Kunimune 2024-11-02 17:31:53 -04:00
parent cfa0455218
commit 43fce57533
1 changed files with 1 additions and 3 deletions
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4
src/maps/Lenticular.java
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@ -229,12 +229,10 @@ public class Lenticular {
public double[] inverse(double x, double y) {
double r2 = x*x + y*y;
if (r2 > 1)
return null;
double th = 2*y/(1 + r2);
double t = pow((1 + th)/(1 - th), 2);
double lat = asin((t - 1)/(t + 1));
double lon = 2*atan2(2*x, 1 - r2);
double lon = 2*atan(2*x/(1 - r2)) + ((r2 > 1) ? 2*PI*signum(x) : 0);
return new double[] {lat, lon};
}
};