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A graphics engine for educational purposes.
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package org.amcgala.framework.shape;

/*
 * Copyright 2011 Cologne University of Applied Sciences Licensed under the
 * Educational Community License, Version 2.0 (the "License"); you may not use
 * this file except in compliance with the License. You may obtain a copy of the
 * License at
 *
 * http://www.osedu.org/licenses/ECL-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

import com.google.common.base.Objects;
import org.amcgala.framework.math.Vector3d;
import org.amcgala.framework.renderer.Renderer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static com.google.common.base.Preconditions.checkNotNull;

/**
 * Polygonobjekt fuer die Koerperdarstellung im 3D Raum
 *
 * @author Steffen Troester
 * @author Robert Giacinto
 */
public class Polygon extends AbstractShape {

    private static final Logger log = LoggerFactory.getLogger(Polygon.class.getName());
    private Line line1;
    private Line line2;
    private Line line3;
    private Line line4;
    private Vector3d norm;


    private Polygon() {
    }

    /**
     * Ein 3d Polygon, das durch 3 Vektoren und seine Norm definiert ist.
     * @param v1 der erste Vektor
     * @param v2 der zweite Vektor
     * @param v3 der dritte Vektor
     * @param norm der Normalenvektor
     */
    public Polygon(Vector3d v1, Vector3d v2, Vector3d v3, Vector3d norm) {
        // TODO Die Vektoren sollten auch außerhalb der Linien verfügbar sein. Sie werden für die Berechnung der Bounding Boxes benötigt.
        checkNotNull(v1);
        checkNotNull(v2);
        checkNotNull(v3);
        checkNotNull(norm);
        line1 = new Line(v1, v2);
        line2 = new Line(v2, v3);
        line3 = new Line(v3, v1);
        this.norm = norm;
    }

    public Polygon(Vector3d v1, Vector3d v2, Vector3d v3, Vector3d norm, String label) {
        this(v1, v2, v3, norm);
        this.label = label;
    }

    public Polygon(Vector3d v1, Vector3d v2, Vector3d v3, Vector3d v4,
                   Vector3d norm) {
        checkNotNull(v1);
        checkNotNull(v2);
        checkNotNull(v3);
        checkNotNull(v4);
        checkNotNull(norm);
        line1 = new Line(v1, v2);
        line2 = new Line(v2, v3);
        line3 = new Line(v3, v4);
        line4 = new Line(v4, v1);
        this.norm = norm;
    }

    public Polygon(Vector3d v1, Vector3d v2, Vector3d v3, Vector3d v4,
                   Vector3d norm, String label) {
        this(v1, v2, v3, v4, norm);
        this.label = label;
    }

    @Override
    public void render(Renderer renderer) {

        // TODO das muss irgendwie ausgelagert werden und sollte nicht Teil des Shapes sein.
        if (renderer.getCamera().getDirection().dot(this.norm) < 0) {
            return;
        }

        // rendering
        if (line1 != null && line2 != null && line3 != null) {
            line1.render(renderer);
            line2.render(renderer);
            line3.render(renderer);
            if (line4 != null) {
                line4.render(renderer);
            }
        }
    }

    @Override
    public String toString() {
        return Objects.toStringHelper(getClass()).add("line1", line1).add("line2", line2).add("line3", line3).add("line4", line4).toString();
    }
}