Here you can find the source of interpolate(Long t, Long t1, Double m1, Long t2, Double m2)
public static Double interpolate(Long t, Long t1, Double m1, Long t2, Double m2)
//package com.java2s; /**/*from w w w . ja v a 2s. c o m*/ * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * <p/> * http://www.apache.org/licenses/LICENSE-2.0 * <p/> * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ public class Main { public static Double interpolate(Long t, Long t1, Double m1, Long t2, Double m2) { //Linear Interpolation : y = y0 + (y1 - y0) * ((x - x0) / (x1 - x0)) if (m1 == null && m2 == null) { return null; } if (m1 == null) return m2; if (m2 == null) return m1; if (t1 == null || t2 == null) return null; double slope = (m2 - m1) / (t2 - t1); return m1 + slope * (t - t1); } }