Here you can find the source of interpolate(double x, double xLeft, double yLeft, double xRight, double yRight, double[] weights)

Parameter | Description |
---|---|

x | the X to generate the interpolated Y for |

xLeft | the X to the left |

yLeft | the Y to the left |

xRight | the X to the right |

yRight | the Y to the right |

weights | array of length 2 to store the weights in (left/right) |

public static double interpolate(double x, double xLeft, double yLeft, double xRight, double yRight, double[] weights)

//package com.java2s; /*/*from www .ja v a 2s .co m*/ * 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/>. */ public class Main { /** * Interpolates the Y value for a given X and the surrounding x/y pairs. * * @param x the X to generate the interpolated Y for * @param xLeft the X to the left * @param yLeft the Y to the left * @param xRight the X to the right * @param yRight the Y to the right * @param weights array of length 2 to store the weights in (left/right) * @return the interpolated Y */ public static double interpolate(double x, double xLeft, double yLeft, double xRight, double yRight, double[] weights) { double result; double[] w; w = weights(x, xLeft, xRight); weights[0] = w[0]; weights[1] = w[1]; result = yLeft * weights[0] + yRight * weights[1]; return result; } /** * Interpolates the Y value for a given X and the surrounding x/y pairs. * * @param x the X to generate the interpolated Y for * @param xLeft the X to the left * @param yLeft the Y to the left * @param xRight the X to the right * @param yRight the Y to the right * @return the interpolated Y */ public static double interpolate(double x, double xLeft, double yLeft, double xRight, double yRight) { return interpolate(x, xLeft, yLeft, xRight, yRight, new double[2]); } /** * Calculates the interpolation weights for the left and right X. * * @param x the X to calculate the interpolation weights * @param xLeft the X to the left * @param xRight the X to the right * @return the weights (left=0, right=1) */ public static double[] weights(double x, double xLeft, double xRight) { double[] result; double xdiff; double weightLeft; double weightRight; xdiff = xRight - xLeft; weightLeft = 1.0 - (x - xLeft) / xdiff; weightRight = 1.0 - (xRight - x) / xdiff; result = new double[] { weightLeft, weightRight }; return result; } }