/* ===========================================================
* Orson Charts : a 3D chart library for the Java(tm) platform
* ===========================================================
*
* (C)opyright 2013-2016, by Object Refinery Limited. All rights reserved.
*
* http://www.object-refinery.com/orsoncharts/index.html
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* If you do not wish to be bound by the terms of the GPL, an alternative
* commercial license can be purchased. For details, please see visit the
* Orson Charts home page:
*
* http://www.object-refinery.com/orsoncharts/index.html
*
*/
package com.orsoncharts.data.function;
import com.orsoncharts.Range;
import com.orsoncharts.util.ArgChecks;
/**
* Utility methods related to {@link Function3D}.
*
* @since 1.1
*/
public class Function3DUtils {
private Function3DUtils() {
// no need to instantiate this
}
/**
* Returns the range of y-values in the function by sampling.
*
* @param f the function ({@code null} not permitted).
* @param xRange the x-range to sample ({@code null} not permitted).
* @param zRange the z-range to sample ({@code null} not permitted).
* @param xSamples the number of x-samples (must be at least 2).
* @param zSamples the number of z-samples (must be at least 2).
* @param ignoreNaN if {@code true}, any {@code NaN} values will
* be ignored.
*
* @return The range ({@code null} in the case that the function
* returns no valid values).
*/
public static Range findYRange(Function3D f, Range xRange, Range zRange,
int xSamples, int zSamples, boolean ignoreNaN) {
ArgChecks.nullNotPermitted(f, "f");
ArgChecks.nullNotPermitted(xRange, "xRange");
ArgChecks.nullNotPermitted(zRange, "zRange");
double min = Double.POSITIVE_INFINITY;
double max = Double.NEGATIVE_INFINITY;
for (int xIndex = 0; xIndex <= xSamples - 1; xIndex++) {
double fracX = xIndex / (xSamples - 1.0);
double x = xRange.value(fracX);
for (int zIndex = 0; zIndex <= zSamples - 1; zIndex++) {
double fracZ = zIndex / (zSamples - 1.0);
double z = zRange.value(fracZ);
double y = f.getValue(x, z);
if (Double.isNaN(y) && ignoreNaN) {
continue;
}
min = Math.min(y, min);
max = Math.max(y, max);
}
}
if (min <= max) {
return new Range(min, max);
}
return null;
}
}