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GeoTrellis is an open source geographic data processing engine for high performance applications.

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/*
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.
 */
package org.osgeo.proj4j.proj;

import org.osgeo.proj4j.ProjCoordinate;
import org.osgeo.proj4j.ProjectionException;
import org.osgeo.proj4j.util.ProjectionMath;

public class BonneProjection extends Projection {
	private double phi1;
	private double cphi1;
	private double am1;
	private double m1;
	private double[] en;

	public ProjCoordinate project(double lplam, double lpphi, ProjCoordinate out) {
		if (spherical) {
			double E, rh;

			rh = cphi1 + phi1 - lpphi;
			if (Math.abs(rh) > EPS10) {
				out.x = rh * Math.sin(E = lplam * Math.cos(lpphi) / rh);
				out.y = cphi1 - rh * Math.cos(E);
			} else
				out.x = out.y = 0.;
		} else {
			double rh, E, c;

			rh = am1 + m1 - ProjectionMath.mlfn(lpphi, E = Math.sin(lpphi), c = Math.cos(lpphi), en);
			E = c * lplam / (rh * Math.sqrt(1. - es * E * E));
			out.x = rh * Math.sin(E);
			out.y = am1 - rh * Math.cos(E);
		}
		return out;
	}

	public ProjCoordinate projectInverse(double xyx, double xyy, ProjCoordinate out) {
		if (spherical) {
			double rh;

			rh = ProjectionMath.distance(xyx, out.y = cphi1 - xyy);
			out.y = cphi1 + phi1 - rh;
			if (Math.abs(out.y) > ProjectionMath.HALFPI) throw new ProjectionException("I");
			if (Math.abs(Math.abs(out.y) - ProjectionMath.HALFPI) <= EPS10)
				out.x = 0.;
			else
				out.x = rh * Math.atan2(xyx, xyy) / Math.cos(out.y);
		} else {
			double s, rh;

			rh = ProjectionMath.distance(xyx, out.y = am1 - xyy);
			out.y = ProjectionMath.inv_mlfn(am1 + m1 - rh, es, en);
			if ((s = Math.abs(out.y)) < ProjectionMath.HALFPI) {
				s = Math.sin(out.y);
				out.x = rh * Math.atan2(xyx, xyy) *
				   Math.sqrt(1. - es * s * s) / Math.cos(out.y);
			} else if (Math.abs(s - ProjectionMath.HALFPI) <= EPS10)
				out.x = 0.;
			else throw new ProjectionException("I");
		}
		return out;
	}

	/**
	 * Returns true if this projection is equal area
	 */
	public boolean isEqualArea() {
		return true;
	}

	public boolean hasInverse() {
		return true;
	}

	public void initialize() {
		super.initialize();

		double c;

//		phi1 = pj_param(params, "rlat_1").f;
		phi1 = ProjectionMath.HALFPI;
		if (Math.abs(phi1) < EPS10)
			throw new ProjectionException("-23");
		if (!spherical) {
			en = ProjectionMath.enfn(es);
			m1 = ProjectionMath.mlfn(phi1, am1 = Math.sin(phi1),
				c = Math.cos(phi1), en);
			am1 = c / (Math.sqrt(1. - es * am1 * am1) * am1);
		} else {
			if (Math.abs(phi1) + EPS10 >= ProjectionMath.HALFPI)
				cphi1 = 0.;
			else
				cphi1 = 1. / Math.tan(phi1);
		}
	}

	public String toString() {
		return "Bonne";
	}

}