/*-
*******************************************************************************
* Copyright (c) 2011, 2014 Diamond Light Source Ltd.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Matthew Gerring - initial API and implementation and/or initial documentation
*******************************************************************************/
package uk.ac.diamond.scisoft.analysis.histogram.functions;
/**
*
*/
public class UserCustomFunction extends AbstractMapFunction {
double[] mapTable;
String funcname;
public UserCustomFunction(String funcname, int tableSize) {
mapTable = new double[tableSize];
this.funcname = funcname;
}
@Override
public String getMapFunctionName() {
return funcname;
}
public void setValues(double[] values) {
mapTable = values.clone();
}
public void setValue(int pos, double value) {
if (pos >= 0 && pos < mapTable.length)
mapTable[pos] = value;
}
@Override
public double mapFunction(double input) {
int lowMapEntry = (int)(input * mapTable.length);
int upMapEntry = (int)Math.ceil(input * mapTable.length);
if (upMapEntry > mapTable.length-1)
upMapEntry = mapTable.length-1;
double a = input * mapTable.length - lowMapEntry;
// linear interpolation
return mapTable[lowMapEntry] * (1.0 - a) + a * mapTable[upMapEntry];
}
}