Here you can find the source of interpolate(long x1, long x2, double y1, double y2, long x)
public static double interpolate(long x1, long x2, double y1, double y2, long x)
//package com.java2s; /*//w w w .jav a 2s .co m * --------------- Kalypso-Header -------------------------------------------------------------------- * * This file is part of kalypso. Copyright (C) 2004, 2005 by: * * Technical University Hamburg-Harburg (TUHH) Institute of River and coastal engineering Denickestr. 22 21073 Hamburg, * Germany http://www.tuhh.de/wb * * and * * Bjoernsen Consulting Engineers (BCE) Maria Trost 3 56070 Koblenz, Germany http://www.bjoernsen.de * * This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General * Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more * details. * * You should have received a copy of the GNU Lesser 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 * * Contact: * * E-Mail: belger@bjoernsen.de schlienger@bjoernsen.de v.doemming@tuhh.de * * --------------------------------------------------------------------------------------------------- */ public class Main { /** * @return f(x) on line (x1,y1) (x2,y2) */ public static double interpolate(long x1, long x2, double y1, double y2, long x) { return y1 + (y2 - y1) * (((double) (x - x1)) / ((double) (x2 - x1))); } }