public void initialize() {
double t;
super.initialize();
if (Math.abs((t = Math.abs(projectionLatitude)) - ProjectionMath.HALFPI) < EPS10)
mode = projectionLatitude < 0. ? SOUTH_POLE : NORTH_POLE;
else mode = t > EPS10 ? OBLIQUE : EQUATOR;
trueScaleLatitude = Math.abs(trueScaleLatitude);
if (!spherical) {
double X;
switch (mode) {
case NORTH_POLE:
case SOUTH_POLE:
if (Math.abs(trueScaleLatitude - ProjectionMath.HALFPI) < EPS10)
akm1 = 2. * scaleFactor / Math.sqrt(Math.pow(1 + e, 1 + e) * Math.pow(1 - e, 1 - e));
else {
akm1 =
Math.cos(trueScaleLatitude)
/ ProjectionMath.tsfn(trueScaleLatitude, t = Math.sin(trueScaleLatitude), e);
t *= e;
akm1 /= Math.sqrt(1. - t * t);
}
break;
case EQUATOR:
akm1 = 2. * scaleFactor;
break;
case OBLIQUE:
t = Math.sin(projectionLatitude);
X = 2. * Math.atan(ssfn(projectionLatitude, t, e)) - ProjectionMath.HALFPI;
t *= e;
akm1 = 2. * scaleFactor * Math.cos(projectionLatitude) / Math.sqrt(1. - t * t);
sinphi0 = Math.sin(X);
cosphi0 = Math.cos(X);
break;
}
} else {
switch (mode) {
case OBLIQUE:
sinphi0 = Math.sin(projectionLatitude);
cosphi0 = Math.cos(projectionLatitude);
case EQUATOR:
akm1 = 2. * scaleFactor;
break;
case SOUTH_POLE:
case NORTH_POLE:
akm1 =
Math.abs(trueScaleLatitude - ProjectionMath.HALFPI) >= EPS10
? Math.cos(trueScaleLatitude)
/ Math.tan(ProjectionMath.QUARTERPI - .5 * trueScaleLatitude)
: 2. * scaleFactor;
break;
}
}
}
public ProjCoordinate project(double lplam, double lpphi, ProjCoordinate xy) {
if (spherical) {
xy.x = Math.asin(Math.cos(lpphi) * Math.sin(lplam));
xy.y = Math.atan2(Math.tan(lpphi), Math.cos(lplam)) - projectionLatitude;
} else {
xy.y = ProjectionMath.mlfn(lpphi, n = Math.sin(lpphi), c = Math.cos(lpphi), en);
n = 1. / Math.sqrt(1. - es * n * n);
tn = Math.tan(lpphi);
t = tn * tn;
a1 = lplam * c;
c *= es * c / (1 - es);
a2 = a1 * a1;
xy.x = n * a1 * (1. - a2 * t * (C1 - (8. - t + 8. * c) * a2 * C2));
xy.y -= m0 - n * tn * a2 * (.5 + (5. - t + 6. * c) * a2 * C3);
}
return xy;
}
public ProjCoordinate projectInverse(double xyx, double xyy, ProjCoordinate out) {
if (spherical) {
out.y = Math.asin(Math.sin(dd = xyy + projectionLatitude) * Math.cos(xyx));
out.x = Math.atan2(Math.tan(xyx), Math.cos(dd));
} else {
double ph1;
ph1 = ProjectionMath.inv_mlfn(m0 + xyy, es, en);
tn = Math.tan(ph1);
t = tn * tn;
n = Math.sin(ph1);
r = 1. / (1. - es * n * n);
n = Math.sqrt(r);
r *= (1. - es) * n;
dd = xyx / n;
d2 = dd * dd;
out.y = ph1 - (n * tn / r) * d2 * (.5 - (1. + 3. * t) * d2 * C3);
out.x = dd * (1. + t * d2 * (-C4 + (1. + 3. * t) * d2 * C5)) / Math.cos(ph1);
}
return out;
}
