Variation3.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.AffineTransform.AffineTransformFloat;
import ca.uqac.lif.synthia.random.RandomFloat;
import ca.uqac.lif.synthia.util.Choice;
import ca.uqac.lif.synthia.util.Freeze;
import ca.uqac.lif.synthia.vector.HyperspherePicker;
import examples.util.Utilities;
 
/**
 * Generates two-dimensional points producing a spiral pattern.
 * The points are generated by composing pickers as in the following diagram:
 * <p>
 * <img src="./doc-files/hypersphere/Variation3.png" alt="Diagram"> 
 * <p>
 * This variation shows the use of the {@link Tick} picker. The radius of the
 * first point is either 0 or 1, and each successive radius increments by a
 * fixed amount of &pi;/6. On its side, the starting angle is randomly selected
 * between four values, and each successive angle is incremented by a fixed
 * amount of &pi;/6. This results in a spiral pattern with slight variations.
 * 
 * @ingroup Examples
 */
public class Variation3 
{
 
    @SuppressWarnings("unchecked")
    public static void main(String[] args)
    {
        RandomFloat r_float1 = new RandomFloat().setSeed(42);
        RandomFloat r_float2 = new RandomFloat().setSeed(40);
        AffineTransformFloat af = new AffineTransformFloat(r_float1, 2, 1);
        Freeze<Float> radius = new Freeze<Float>(af);
        Choice<Double> angle = new Choice<Double>(r_float2)
                .add(0d, 0.25).add(Math.PI / 2, 0.25).add(Math.PI, 0.25).add(3 * Math.PI / 2, 0.25);
        HyperspherePicker hp = new HyperspherePicker(radius, angle);
        for (int i = 0; i < 100; i++)
        {
            Utilities.print(System.out, hp.pick());
        }
    }
 
}