box.java

来自「java 3d game jme 工程开发源代码」· Java 代码 · 共 173 行

/*
 * Copyright (c) 2003-2009 jMonkeyEngine
 * All rights reserved.
 *
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// $Id: Box.java 4091 2009-01-21 19:01:20Z joshua.j.ellen $
package com.jme.scene.shape;

import java.nio.FloatBuffer;

import com.jme.math.Vector3f;
import com.jme.scene.TexCoords;
import com.jme.util.geom.BufferUtils;

/**
 * A box with solid (filled) faces.
 * 
 * @author Mark Powell
 * @version $Revision: 4091 $, $Date: 2009-01-22 03:01:20 +0800 (星期四, 22 一月 2009) $
 */
public class Box extends AbstractBox {
    
    private static final int[] GEOMETRY_INDICES_DATA = {
         2,  1,  0,  3,  2,  0, // back
         6,  5,  4,  7,  6,  4, // right
        10,  9,  8, 11, 10,  8, // front
        14, 13, 12, 15, 14, 12, // left
        18, 17, 16, 19, 18, 16, // top
        22, 21, 20, 23, 22, 20  // bottom
    };

    private static final float[] GEOMETRY_NORMALS_DATA = {
        0,  0, -1,  0,  0, -1,  0,  0, -1,  0,  0, -1, // back
        1,  0,  0,  1,  0,  0,  1,  0,  0,  1,  0,  0, // right
        0,  0,  1,  0,  0,  1,  0,  0,  1,  0,  0,  1, // front
       -1,  0,  0, -1,  0,  0, -1,  0,  0, -1,  0,  0, // left
        0,  1,  0,  0,  1,  0,  0,  1,  0,  0,  1,  0, // top
        0, -1,  0,  0, -1,  0,  0, -1,  0,  0, -1,  0  // bottom
    };

    private static final float[] GEOMETRY_TEXTURE_DATA = {
        1, 0, 0, 0, 0, 1, 1, 1, // back
        1, 0, 0, 0, 0, 1, 1, 1, // right
        1, 0, 0, 0, 0, 1, 1, 1, // front
        1, 0, 0, 0, 0, 1, 1, 1, // left
        1, 0, 0, 0, 0, 1, 1, 1, // top
        1, 0, 0, 0, 0, 1, 1, 1  // bottom
    };

    private static final long serialVersionUID = 1L;

    public Box() {
        this(null);
    }

    /**
     * Creates a new box.
     * <p>
     * Center and vertices information must be supplied later.
     * 
     * @param name the name of the box.
     */
    public Box(String name) {
        super(name);
    }

    /**
     * Creates a new box.
     * <p>
     * The box has the given center and extends in the out from the center by
     * the given amount in <em>each</em> direction. So, for example, a box
     * with extent of 0.5 would be the unit cube.
     * 
     * @param name the name of the box.
     * @param center the center of the box.
     * @param x the size of the box along the x axis, in both directions.
     * @param y the size of the box along the y axis, in both directions.
     * @param z the size of the box along the z axis, in both directions.
     */
    public Box(String name, Vector3f center, float x, float y, float z) {
        super(name);
        updateGeometry(center, x, y, z);
    }

    /**
     * Constructor instantiates a new <code>Box</code> object.
     * <p>
     * The minimum and maximum point are provided, these two points define the
     * shape and size of the box but not it’s orientation or position. You should
     * use the {@link #setLocalTranslation()} and {@link #setLocalRotation()}
     * methods to define those properties.
     * 
     * @param name the name of the box.
     * @param min the minimum point that defines the box.
     * @param max the maximum point that defines the box.
     */
    public Box(String name, Vector3f min, Vector3f max) {
        super(name);
        updateGeometry(min, max);
    }

    /**
     * Creates a clone of this box.
     * <p>
     * The cloned box will have ‘_clone’ appended to it’s name, but all other
     * properties will be the same as this box.
     */
    public Box clone() {
        return new Box(getName() + "_clone", center.clone(), xExtent, yExtent, zExtent);
    }

    protected void duUpdateGeometryIndices() {
        if (getIndexBuffer() == null) {
            setIndexBuffer(BufferUtils.createIntBuffer(GEOMETRY_INDICES_DATA));
        }
    }

    protected void duUpdateGeometryNormals() {
        if (getNormalBuffer() == null) {
            setNormalBuffer(BufferUtils.createVector3Buffer(24));
            getNormalBuffer().put(GEOMETRY_NORMALS_DATA);
        }
    }

    protected void duUpdateGeometryTextures() {
        if (getTextureCoords().get(0) == null) {
            getTextureCoords().set(0, new TexCoords(BufferUtils.createVector2Buffer(24)));
            FloatBuffer tex = getTextureCoords().get(0).coords;
            tex.put(GEOMETRY_TEXTURE_DATA);
        }
    }

    protected void duUpdateGeometryVertices() {
        setVertexBuffer(BufferUtils.createVector3Buffer(getVertexBuffer(), 24));
        setVertexCount(24);
        Vector3f[] v = computeVertices();
        getVertexBuffer().put(new float[] {
                v[0].x, v[0].y, v[0].z, v[1].x, v[1].y, v[1].z, v[2].x, v[2].y, v[2].z, v[3].x, v[3].y, v[3].z, // back
                v[1].x, v[1].y, v[1].z, v[4].x, v[4].y, v[4].z, v[6].x, v[6].y, v[6].z, v[2].x, v[2].y, v[2].z, // right
                v[4].x, v[4].y, v[4].z, v[5].x, v[5].y, v[5].z, v[7].x, v[7].y, v[7].z, v[6].x, v[6].y, v[6].z, // front
                v[5].x, v[5].y, v[5].z, v[0].x, v[0].y, v[0].z, v[3].x, v[3].y, v[3].z, v[7].x, v[7].y, v[7].z, // left
                v[2].x, v[2].y, v[2].z, v[6].x, v[6].y, v[6].z, v[7].x, v[7].y, v[7].z, v[3].x, v[3].y, v[3].z, // top
                v[0].x, v[0].y, v[0].z, v[5].x, v[5].y, v[5].z, v[4].x, v[4].y, v[4].z, v[1].x, v[1].y, v[1].z  // bottom
        });
    }

}