/*
Copyright 2006 Jerry Huxtable
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/*
* This file was semi-automatically converted from the public-domain USGS PROJ source.
*
* Bernhard Jenny, 23 September 2010: changed name to Hatano Asymmetrical, added
* isEqualArea
*/
package com.jhlabs.map.proj;
import java.awt.geom.*;
import com.jhlabs.map.*;
public class HatanoProjection extends Projection {
private final static int NITER = 20;
private final static double EPS = 1e-7;
private final static double ONETOL = 1.000001;
private final static double CN = 2.67595;
private final static double CS = 2.43763;
private final static double RCN = 0.37369906014686373063;
private final static double RCS = 0.41023453108141924738;
private final static double FYCN = 1.75859;
private final static double FYCS = 1.93052;
private final static double RYCN = 0.56863737426006061674;
private final static double RYCS = 0.51799515156538134803;
private final static double FXC = 0.85;
private final static double RXC = 1.17647058823529411764;
public Point2D.Double project(double lplam, double lpphi, Point2D.Double out) {
double th1, c;
int i;
c = Math.sin(lpphi) * (lpphi < 0. ? CS : CN);
for (i = NITER; i > 0; --i) {
lpphi -= th1 = (lpphi + Math.sin(lpphi) - c) / (1. + Math.cos(lpphi));
if (Math.abs(th1) < EPS) {
break;
}
}
out.x = FXC * lplam * Math.cos(lpphi *= .5);
out.y = Math.sin(lpphi) * (lpphi < 0. ? FYCS : FYCN);
return out;
}
public Point2D.Double projectInverse(double xyx, double xyy, Point2D.Double out) {
double th;
th = xyy * (xyy < 0. ? RYCS : RYCN);
if (Math.abs(th) > 1.) {
if (Math.abs(th) > ONETOL) {
throw new ProjectionException("I");
} else {
th = th > 0. ? MapMath.HALFPI : -MapMath.HALFPI;
}
} else {
th = Math.asin(th);
}
out.x = RXC * xyx / Math.cos(th);
th += th;
out.y = (th + Math.sin(th)) * (xyy < 0. ? RCS : RCN);
if (Math.abs(out.y) > 1.) {
if (Math.abs(out.y) > ONETOL) {
throw new ProjectionException("I");
} else {
out.y = out.y > 0. ? MapMath.HALFPI : -MapMath.HALFPI;
}
} else {
out.y = Math.asin(out.y);
}
return out;
}
public boolean hasInverse() {
return true;
}
public boolean isEqualArea() {
return true;
}
public String toString() {
return "Hatano Asymmetrical";
}
}