/*
* Copyright (c) 2013, Will Szumski
* Copyright (c) 2013, Doug Szumski
*
* This file is part of Cyclismo.
*
* Cyclismo 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.
*
* Cyclismo 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 Cyclismo. If not, see <http://www.gnu.org/licenses/>.
*/
package org.fluxoid.utils;
public class TrapezoidIntegrator {
Double lastY;
Double lastX;
double integral = 0;
public double add(double x, double y) {
if (lastY == null) {
lastY = y;
lastX = x;
return 0;
}
integral += 0.5 * (x - lastX) * (y + lastY);
lastY = y;
lastX = x;
return integral;
}
/**
* @return the integral
*/
public double getIntegral() {
return integral;
}
/**
* Adjust integral to a new value
*/
public void setIntegral(double newValue) {
integral = newValue;
}
/**
* @param args
*/
public static void main(String[] args) {
TrapezoidIntegrator I = new TrapezoidIntegrator();
for (int i = 0; i <= 100; i++) {
I.add(i, i);
}
System.out.println(I.getIntegral());
}
}