Toroid.java

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/*
 * Cylinder.java
 *
 * Copyright 2014-2014 Michael Hoffer info@michaelhoffer.de. All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY Michael Hoffer info@michaelhoffer.de "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL Michael Hoffer info@michaelhoffer.de OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * The views and conclusions contained in the software and documentation are
 * those of the authors and should not be interpreted as representing official
 * policies, either expressed or implied, of Michael Hoffer
 * info@michaelhoffer.de.
 */
package eu.mihosoft.vrl.v3d;
 
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
 
public class Toroid extends Primitive {
 
    private final PropertyStorage properties = new PropertyStorage();
    List<Polygon> polys;
    public Toroid(double innerRadius, double OuterRadius) {
        this(innerRadius,OuterRadius,20,16);
    }
    public Toroid(double innerRadius, double OuterRadius, int numSlices, int facets) {
        if (innerRadius < 0)
            throw new RuntimeException("Inner radious must be positive");
        if (innerRadius >= OuterRadius)
            throw new RuntimeException("Outer radius must be larger than inner radius");
        double crossSecRad = OuterRadius - innerRadius;
        ArrayList<Vertex> vertices = new ArrayList<>();
        double f = facets;
 
        for (int i = 0; i < facets; i++) {
            double index = i;
            double rad = index / f * 2 * Math.PI;
            double a = Math.cos(rad) * crossSecRad;
            double b = Math.sin(rad) * crossSecRad;
            vertices.add(new Vertex(new Vector3d(a,b), new Vector3d(-1, 0,0)));
        }
        Polygon poly = new Polygon(vertices, properties);
        ArrayList<Polygon> slices = new ArrayList<Polygon>();
 
        for (int i = 0; i < numSlices; i++) {
            double angle = 360.0 / ((double) numSlices) * ((double) i);
            slices.add(poly.transformed(new Transform().movex(innerRadius+crossSecRad).roty(angle)));
        }
        List<Polygon> newPolygons = new ArrayList<>();
        for (int j = 0; j < slices.size(); j++) {
            int next = j + 1;
            if (next == slices.size())
                next = 0;
            // println "Extruding "+i+" to "+next
            Polygon polygon1=slices.get(j);
            Polygon polygon2=slices.get(next);
            if (polygon1.vertices.size() != polygon2.vertices.size()) {
                throw new RuntimeException("These polygons do not match");
            }
    
            int numvertices = polygon1.vertices.size();
            for (int i = 0; i < numvertices; i++) {
    
                int nexti = (i + 1) % numvertices;
    
                Vector3d bottomV1 = polygon1.vertices.get(i).pos;
                Vector3d topV1 = polygon2.vertices.get(i).pos;
                Vector3d bottomV2 = polygon1.vertices.get(nexti).pos;
                Vector3d topV2 = polygon2.vertices.get(nexti).pos;
    
                List<Vector3d> pPoints = Arrays.asList(bottomV2, topV2, topV1, bottomV1);
    
                newPolygons.add(Polygon.fromPoints(pPoints, polygon1.getStorage()));
    
            }
    
            polygon2 = polygon2.flipped();
    
        }
        polys = newPolygons;
    }
 
    /*
     * (non-Javadoc)
     * 
     * @see eu.mihosoft.vrl.v3d.Primitive#toPolygons()
     */
    @Override
    public List<Polygon> toPolygons() {
        return polys;
    }
 
    /*
     * (non-Javadoc)
     * 
     * @see eu.mihosoft.vrl.v3d.Primitive#getProperties()
     */
    @Override
    public PropertyStorage getProperties() {
        return properties;
    }
 
}