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Java example source code file (RandomCirclePointGenerator.java)
The RandomCirclePointGenerator.java Java example source code/* * 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 * * http://www.apache.org/licenses/LICENSE-2.0 * * 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. */ package org.apache.commons.math3.fitting.leastsquares; import org.apache.commons.math3.random.RandomGenerator; import org.apache.commons.math3.random.Well44497b; import org.apache.commons.math3.util.MathUtils; import org.apache.commons.math3.util.FastMath; import org.apache.commons.math3.distribution.RealDistribution; import org.apache.commons.math3.distribution.UniformRealDistribution; import org.apache.commons.math3.distribution.NormalDistribution; import org.apache.commons.math3.geometry.euclidean.twod.Vector2D; /** * Factory for generating a cloud of points that approximate a circle. */ public class RandomCirclePointGenerator { /** RNG for the x-coordinate of the center. */ private final RealDistribution cX; /** RNG for the y-coordinate of the center. */ private final RealDistribution cY; /** RNG for the parametric position of the point. */ private final RealDistribution tP; /** Radius of the circle. */ private final double radius; /** * @param x Abscissa of the circle center. * @param y Ordinate of the circle center. * @param radius Radius of the circle. * @param xSigma Error on the x-coordinate of the circumference points. * @param ySigma Error on the y-coordinate of the circumference points. * @param seed RNG seed. */ public RandomCirclePointGenerator(double x, double y, double radius, double xSigma, double ySigma, long seed) { final RandomGenerator rng = new Well44497b(seed); this.radius = radius; cX = new NormalDistribution(rng, x, xSigma, NormalDistribution.DEFAULT_INVERSE_ABSOLUTE_ACCURACY); cY = new NormalDistribution(rng, y, ySigma, NormalDistribution.DEFAULT_INVERSE_ABSOLUTE_ACCURACY); tP = new UniformRealDistribution(rng, 0, MathUtils.TWO_PI); } /** * Point generator. * * @param n Number of points to create. * @return the cloud of {@code n} points. */ public Vector2D[] generate(int n) { final Vector2D[] cloud = new Vector2D[n]; for (int i = 0; i < n; i++) { cloud[i] = create(); } return cloud; } /** * Create one point. * * @return a point. */ private Vector2D create() { final double t = tP.sample(); final double pX = cX.sample() + radius * FastMath.cos(t); final double pY = cY.sample() + radius * FastMath.sin(t); return new Vector2D(pX, pY); } } Other Java examples (source code examples)Here is a short list of links related to this Java RandomCirclePointGenerator.java source code file: |
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