Variation1.java

Go to the documentation of this file.

/*
    Synthia, a data structure generator
    Copyright (C) 2019-2021 Laboratoire d'informatique formelle
    Université du Québec à Chicoutimi, Canada
 
    This program 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 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 Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package examples.hypersphere;
 
import ca.uqac.lif.synthia.random.AffineTransform.AffineTransformFloat;
import ca.uqac.lif.synthia.random.RandomFloat;
import ca.uqac.lif.synthia.random.RandomInteger;
import ca.uqac.lif.synthia.vector.HyperspherePicker;
import examples.util.Utilities;
 
/**
 * Generates two-dimensional points lying along two concentric circles.
 * The points are generated by composing pickers as in the following diagram:
 * <p>
 * <img src="./doc-files/hypersphere/Variation1.png" alt="Diagram"> 
 * <p>
 * For each point, a radius of either 1 or 2 is selected. A random floating
 * point <i>x</i> between 0 and 1 is also selected, to which the affine
 * transform 2&pi;<i>x</i>+0 is then applied. The end result is that each
 * point lies at any angle between 0 and 2&pi; on the circle of radius 1 or 2.
 * The two plots at the bottom represent the possible values one could
 * obtain by starting from a different random seed.
 * 
 * @ingroup Examples
 */
public class Variation1 
{
 
    @SuppressWarnings("unchecked")
    public static void main(String[] args)
    {
        RandomInteger radius = new RandomInteger(1, 3);
        RandomFloat r_float = new RandomFloat().setSeed(42);
        AffineTransformFloat angle = new AffineTransformFloat(r_float, 2 * Math.PI, 0);
        HyperspherePicker hp = new HyperspherePicker(radius, angle);
        for (int i = 0; i < 100; i++)
        {
            Utilities.print(System.out, hp.pick());
        }
    }
 
}