engine/src/core/com/jme3/scene/shape/Quad.java

/*
 * Copyright (c) 2009-2010 jMonkeyEngine
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * 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.
 *
 * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
 *   may be used to endorse or promote products derived from this software
 *   without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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 THE COPYRIGHT OWNER 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
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 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.jme3.scene.shape;

import com.jme3.scene.Mesh;
import com.jme3.scene.VertexBuffer.Type;

/**
 * <code>Quad</code> represents a rectangular plane in space
 * defined by 4 vertices. The quad's lower-left side is contained
 * at the local space origin (0, 0, 0), while the upper-right
 * side is located at the width/height coordinates (width, height, 0).
 * 
 * @author Kirill Vainer
 */
public class Quad extends Mesh {

    private float width;
    private float height;

    /**
     * Serialization only. Do not use.
     */
    public Quad(){
    }

    /**
     * Create a quad with the given width and height. The quad
     * is always created in the XY plane.
     * 
     * @param width The X extent or width
     * @param height The Y extent or width
     */
    public Quad(float width, float height){
        updateGeometry(width, height);
    }

    /**
     * Create a quad with the given width and height. The quad
     * is always created in the XY plane.
     * 
     * @param width The X extent or width
     * @param height The Y extent or width
     * @param flipCoords If true, the texture coordinates will be flipped
     * along the Y axis.
     */
    public Quad(float width, float height, boolean flipCoords){
        updateGeometry(width, height, flipCoords);
    }

    public float getHeight() {
        return height;
    }

    public float getWidth() {
        return width;
    }

    public void updateGeometry(float width, float height){
        updateGeometry(width, height, false);
    }

    public void updateGeometry(float width, float height, boolean flipCoords) {
        this.width = width;
        this.height = height;
        setBuffer(Type.Position, 3, new float[]{0,      0,      0,
                                                width,  0,      0,
                                                width,  height, 0,
                                                0,      height, 0
                                                });
        

        if (flipCoords){
            setBuffer(Type.TexCoord, 2, new float[]{0, 1,
                                                    1, 1,
                                                    1, 0,
                                                    0, 0});
        }else{
            setBuffer(Type.TexCoord, 2, new float[]{0, 0,
                                                    1, 0,
                                                    1, 1,
                                                    0, 1});
        }
        setBuffer(Type.Normal, 3, new float[]{0, 0, 1,
                                              0, 0, 1,
                                              0, 0, 1,
                                              0, 0, 1});
        if (height < 0){
            setBuffer(Type.Index, 3, new short[]{0, 2, 1,
                                                 0, 3, 2});
        }else{
            setBuffer(Type.Index, 3, new short[]{0, 1, 2,
                                                 0, 2, 3});
        }
        
        updateBound();
    }


}