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PerspectiveProjection.java
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PerspectiveProjection.java
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/*
* Copyright 2016 Martin Davis, Azavea
*
* 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;
public class PerspectiveProjection extends Projection {
private double height;
private double psinph0;
private double pcosph0;
private double p;
private double rp;
private double pn1;
private double pfact;
private double h;
private double cg;
private double sg;
private double sw;
private double cw;
private int mode;
private int tilt;
private final static double EPS10 = 1.e-10;
private final static int N_POLE = 0;
private final static int S_POLE = 1;
private final static int EQUIT = 2;
private final static int OBLIQ = 3;
public ProjCoordinate project(double lplam, double lpphi, ProjCoordinate xy) {
double coslam, cosphi, sinphi;
sinphi = Math.sin(lpphi);
cosphi = Math.cos(lpphi);
coslam = Math.cos(lplam);
switch (mode) {
case OBLIQ:
xy.y = psinph0 * sinphi + pcosph0 * cosphi * coslam;
break;
case EQUIT:
xy.y = cosphi * coslam;
break;
case S_POLE:
xy.y = - sinphi;
break;
case N_POLE:
xy.y = sinphi;
break;
}
// if (xy.y < rp)
// throw new ProjectionException("");
xy.y = pn1 / (p - xy.y);
xy.x = xy.y * cosphi * Math.sin(lplam);
switch (mode) {
case OBLIQ:
xy.y *= (pcosph0 * sinphi -
psinph0 * cosphi * coslam);
break;
case EQUIT:
xy.y *= sinphi;
break;
case N_POLE:
coslam = - coslam;
case S_POLE:
xy.y *= cosphi * coslam;
break;
}
if (tilt != 0) {
double yt, ba;
yt = xy.y * cg + xy.x * sg;
ba = 1. / (yt * sw * h + cw);
xy.x = (xy.x * cg - xy.y * sg) * cw * ba;
xy.y = yt * ba;
}
return xy;
}
public boolean hasInverse() {
return false;
}
/*FIXME
INVERSE(s_inverse); /* spheroid * /
double rh, cosz, sinz;
if (tilt) {
double bm, bq, yt;
yt = 1./(pn1 - xy.y * sw);
bm = pn1 * xy.x * yt;
bq = pn1 * xy.y * cw * yt;
xy.x = bm * cg + bq * sg;
xy.y = bq * cg - bm * sg;
}
rh = hypot(xy.x, xy.y);
if ((sinz = 1. - rh * rh * pfact) < 0.) I_ERROR;
sinz = (p - Math.sqrt(sinz)) / (pn1 / rh + rh / pn1);
cosz = sqrt(1. - sinz * sinz);
if (fabs(rh) <= EPS10) {
lp.lam = 0.;
lp.phi = phi0;
} else {
switch (mode) {
case OBLIQ:
lp.phi = Math.asin(cosz * sinph0 + xy.y * sinz * cosph0 / rh);
xy.y = (cosz - sinph0 * sin(lp.phi)) * rh;
xy.x *= sinz * cosph0;
break;
case EQUIT:
lp.phi = Math.asin(xy.y * sinz / rh);
xy.y = cosz * rh;
xy.x *= sinz;
break;
case N_POLE:
lp.phi = Math.asin(cosz);
xy.y = -xy.y;
break;
case S_POLE:
lp.phi = - Math.asin(cosz);
break;
}
lp.lam = Math.atan2(xy.x, xy.y);
}
return (lp);
}
*/
public void initialize() {
super.initialize();
mode = EQUIT;
height = a;
tilt = 0;
// if ((height = pj_param(params, "dh").f) <= 0.) E_ERROR(-30);
/*
if (fabs(fabs(phi0) - Math.HALFPI) < EPS10)
mode = phi0 < 0. ? S_POLE : N_POLE;
else if (fabs(phi0) < EPS10)
mode = EQUIT;
else {
mode = OBLIQ;
psinph0 = Math.sin(phi0);
pcosph0 = Math.cos(phi0);
}
*/
pn1 = height / a; /* normalize by radius */
p = 1. + pn1;
rp = 1. / p;
h = 1. / pn1;
pfact = (p + 1.) * h;
es = 0.;
}
/*FIXME
ENTRY0(nsper)
tilt = 0;
ENDENTRY(setup(P))
ENTRY0(tpers)
double omega, gamma;
omega = pj_param(params, "dtilt").f * DEG_TO_RAD;
gamma = pj_param(params, "dazi").f * DEG_TO_RAD;
tilt = 1;
cg = cos(gamma); sg = sin(gamma);
cw = cos(omega); sw = sin(omega);
ENDENTRY(setup(P))
*/
public String toString() {
return "Perspective";
}
}