Variation4.java

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/*
    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.RandomFloat;
import ca.uqac.lif.synthia.random.RandomInteger;
import ca.uqac.lif.synthia.util.Choice;
import ca.uqac.lif.synthia.util.Constant;
import ca.uqac.lif.synthia.util.Tick;
import ca.uqac.lif.synthia.vector.HyperspherePicker;
import examples.util.Utilities;
 
/**
 * Generates two-dimensional points lying along an oblique line.
 * The points are generated by composing pickers as in the following diagram:
 * <p>
 * <img src="./doc-files/hypersphere/Variation4.png" alt="Diagram"> 
 * <p>
 * The angle for each point is fixed to 3&pi;/2, and the radius is picked
 * according to a normal distribution, resulting in points clustered close to
 * the origin.
 * 
 * @ingroup Examples
 */
public class Variation4 
{
    @SuppressWarnings("unchecked")
    public static void main(String[] args)
    {
        RandomInteger ri = new RandomInteger(0, 2).setSeed(42);
        Constant<Float> c1 = new Constant<Float>(1 / 6f);
        Tick radius = new Tick(ri, c1);
        RandomFloat rf = new RandomFloat().setSeed(42);
        Choice<Double> start = new Choice<Double>(rf)
                .add(0d, 0.25).add(Math.PI / 2, 0.25).add(Math.PI, 0.25).add(3 * Math.PI / 2, 0.25);
        Constant<Float> c2 = new Constant<Float>(1 / 6f);
        Tick angle = new Tick(start, c2);
        HyperspherePicker hp = new HyperspherePicker(radius, angle);
        for (int i = 0; i < 100; i++)
        {
            Utilities.print(System.out, hp.pick());
        }
    }
 
}