//
// FlowSphericalCoordinateSystem.java
//
/*
VisAD system for interactive analysis and visualization of numerical
data. Copyright (C) 1996 - 2017 Bill Hibbard, Curtis Rueden, Tom
Rink, Dave Glowacki, Steve Emmerson, Tom Whittaker, Don Murray, and
Tommy Jasmin.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA
*/
package visad;
/**
FlowSphericalCoordinateSystem is the VisAD CoordinateSystem class
for (Elevation, Azimuth, Radial) with a Cartesian Reference,
with Elevation and Azimuth in degrees and Radial in meters
per second. Note Elevation and Azimuth are direction that
wind is from.<P>
*/
public class FlowSphericalCoordinateSystem extends CoordinateSystem {
private static Unit[] coordinate_system_units =
{CommonUnit.degree, CommonUnit.degree, CommonUnit.meterPerSecond};
/** construct a CoordinateSystem for (elevation, azimuth,
radial) relative to a 3-D Cartesian reference;
this constructor supplies units =
{CommonUnit.Degree, CommonUnit.Degree, CommonUnit.meterPerSecond}
to the super constructor, in order to ensure Unit compatibility
with its use of trigonometric functions */
public FlowSphericalCoordinateSystem(RealTupleType reference)
throws VisADException {
super(reference, coordinate_system_units);
}
/** trusted constructor for initializers */
FlowSphericalCoordinateSystem(RealTupleType reference, boolean b) {
super(reference, coordinate_system_units, b);
}
public double[][] toReference(double[][] tuples) throws VisADException {
if (tuples == null || tuples.length != 3) {
throw new CoordinateSystemException("FlowSphericalCoordinateSystem." +
"toReference: tuples wrong dimension");
}
int len = tuples[0].length;
double[][] value = new double[3][len];
for (int i=0; i<len ;i++) {
if (tuples[2][i] < 0.0) {
value[0][i] = Double.NaN;
value[1][i] = Double.NaN;
value[2][i] = Double.NaN;
}
else {
double coslat = Math.cos(Data.DEGREES_TO_RADIANS * tuples[0][i]);
double sinlat = Math.sin(Data.DEGREES_TO_RADIANS * tuples[0][i]);
double coslon = Math.cos(Data.DEGREES_TO_RADIANS * tuples[1][i]);
double sinlon = Math.sin(Data.DEGREES_TO_RADIANS * tuples[1][i]);
value[0][i] = -tuples[2][i] * sinlon * coslat;
value[1][i] = -tuples[2][i] * coslon * coslat;
value[2][i] = -tuples[2][i] * sinlat;
}
}
return value;
}
public double[][] fromReference(double[][] tuples) throws VisADException {
if (tuples == null || tuples.length != 3) {
throw new CoordinateSystemException("FlowSphericalCoordinateSystem." +
"fromReference: tuples wrong dimension");
}
int len = tuples[0].length;
double[][] value = new double[3][len];
for (int i=0; i<len ;i++) {
value[2][i] = Math.sqrt(tuples[0][i] * tuples[0][i] +
tuples[1][i] * tuples[1][i] +
tuples[2][i] * tuples[2][i]);
value[0][i] =
Data.RADIANS_TO_DEGREES * Math.asin(-tuples[2][i] / value[2][i]);
value[1][i] =
Data.RADIANS_TO_DEGREES * Math.atan2(-tuples[0][i], -tuples[1][i]);
if (value[1][i] < 0.0) value[1][i] += 360.0;
}
return value;
}
public float[][] toReference(float[][] tuples) throws VisADException {
if (tuples == null || tuples.length != 3) {
throw new CoordinateSystemException("FlowSphericalCoordinateSystem." +
"toReference: tuples wrong dimension");
}
int len = tuples[0].length;
float[][] value = new float[3][len];
for (int i=0; i<len ;i++) {
if (tuples[2][i] < 0.0) {
value[0][i] = Float.NaN;
value[1][i] = Float.NaN;
value[2][i] = Float.NaN;
}
else {
float coslat = (float) Math.cos(Data.DEGREES_TO_RADIANS * tuples[0][i]);
float sinlat = (float) Math.sin(Data.DEGREES_TO_RADIANS * tuples[0][i]);
float coslon = (float) Math.cos(Data.DEGREES_TO_RADIANS * tuples[1][i]);
float sinlon = (float) Math.sin(Data.DEGREES_TO_RADIANS * tuples[1][i]);
value[0][i] = -tuples[2][i] * sinlon * coslat;
value[1][i] = -tuples[2][i] * coslon * coslat;
value[2][i] = -tuples[2][i] * sinlat;
}
}
return value;
}
public float[][] fromReference(float[][] tuples) throws VisADException {
if (tuples == null || tuples.length != 3) {
throw new CoordinateSystemException("FlowSphericalCoordinateSystem." +
"fromReference: tuples wrong dimension");
}
int len = tuples[0].length;
float[][] value = new float[3][len];
for (int i=0; i<len ;i++) {
value[2][i] = (float) Math.sqrt(tuples[0][i] * tuples[0][i] +
tuples[1][i] * tuples[1][i] +
tuples[2][i] * tuples[2][i]);
value[0][i] = (float)
(Data.RADIANS_TO_DEGREES * Math.asin(-tuples[2][i] / value[2][i]));
value[1][i] = (float)
(Data.RADIANS_TO_DEGREES * Math.atan2(-tuples[0][i], -tuples[1][i]));
if (value[1][i] < 0.0f) value[1][i] += 360.0f;
}
return value;
}
public boolean equals(Object cs) {
return (cs instanceof FlowSphericalCoordinateSystem);
}
}