Triangle.java

/**
 * Copyright 2010 JogAmp Community. 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 JogAmp Community ``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 JogAmp Community 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 JogAmp Community.
 */
package com.jogamp.graph.geom;

import com.jogamp.opengl.math.VectorUtil;

import jogamp.graph.geom.plane.AffineTransform;

public class Triangle {
    private final Vertex[] vertices = new Vertex[3];
    private final boolean[] boundaryEdges = new boolean[3];
    private boolean[] boundaryVertices = null;
    private int id;

    public Triangle(final Vertex v1, final Vertex v2, final Vertex v3, final boolean[] boundaryVertices) {
        id = Integer.MAX_VALUE;
        vertices[0] = v1;
        vertices[1] = v2;
        vertices[2] = v3;
        this.boundaryVertices = boundaryVertices;
    }

    public Triangle(final Triangle src) {
        id = src.id;
        vertices[0] = src.vertices[0].clone();
        vertices[1] = src.vertices[1].clone();
        vertices[2] = src.vertices[2].clone();
        System.arraycopy(src.boundaryEdges, 0, boundaryEdges, 0, 3);
        boundaryVertices = new boolean[3];
        System.arraycopy(src.boundaryVertices, 0, boundaryVertices, 0, 3);
    }

    private Triangle(final int id, final boolean[] boundaryEdges, final boolean[] boundaryVertices){
        this.id = id;
        System.arraycopy(boundaryEdges, 0, this.boundaryEdges, 0, 3);
        this.boundaryVertices = new boolean[3];
        System.arraycopy(boundaryVertices, 0, this.boundaryVertices, 0, 3);
    }

    /**
     * Returns a transformed a clone of this instance using the given AffineTransform.
     */
    public Triangle transform(final AffineTransform t, final Vertex.Factory<? extends Vertex> vertexFactory) {
        final Triangle tri = new Triangle(id, boundaryEdges, boundaryVertices);
        tri.vertices[0] = t.transform(vertices[0], vertexFactory.create());
        tri.vertices[1] = t.transform(vertices[1], vertexFactory.create());
        tri.vertices[2] = t.transform(vertices[2], vertexFactory.create());
        return tri;
    }

    /**
     * Returns true if all vertices are on-curve, otherwise false.
     */
    public final boolean isOnCurve() {
        return vertices[0].isOnCurve() && vertices[1].isOnCurve() && vertices[2].isOnCurve();
    }

    /**
     * Returns true if all vertices are lines, i.e. zero tex-coord, otherwise false.
     */
    public final boolean isLine() {
        return VectorUtil.isVec2Zero(vertices[0].getTexCoord(), 0) &&
               VectorUtil.isVec2Zero(vertices[1].getTexCoord(), 0) &&
               VectorUtil.isVec2Zero(vertices[2].getTexCoord(), 0) ;
    }

    public int getId() {
        return id;
    }

    public void setId(final int id) {
        this.id = id;
    }

    /** Returns array of 3 vertices, denominating the triangle. */
    public Vertex[] getVertices() {
        return vertices;
    }

    public boolean isEdgesBoundary() {
        return boundaryEdges[0] || boundaryEdges[1] || boundaryEdges[2];
    }

    public boolean isVerticesBoundary() {
        return boundaryVertices[0] || boundaryVertices[1] || boundaryVertices[2];
    }

    public boolean[] getEdgeBoundary() {
        return boundaryEdges;
    }

    public boolean[] getVerticesBoundary() {
        return boundaryVertices;
    }

    public void setVerticesBoundary(final boolean[] boundaryVertices) {
        this.boundaryVertices = boundaryVertices;
    }

    @Override
    public String toString() {
        return "Tri ID: " + id + ", onCurve "+isOnCurve()+"\n\t" +
                            vertices[0]  + ", bound "+boundaryVertices[0]+"\n\t" +
                            vertices[1]  + ", bound "+boundaryVertices[1]+"\n\t" +
                            vertices[2]  + ", bound "+boundaryVertices[2];
    }
}