displayboundingbox.java

Java 3D Game SDK.老外做的.

/*
 * SimpleBox.java
 */

package org.java3dgamesdk.graphics.util;

import javax.media.j3d.*;
import javax.vecmath.*;

import com.sun.j3d.utils.geometry.*;

import org.java3dgamesdk.graphics.*;

/**
 *
 * @author  Norbert Nopper
 */
public class DisplayBoundingBox extends Model3D {
    
    /**
     * Class variable for the red color.
     */
    final public static Color3f RED = new Color3f(1.0f, 0.0f, 0.0f);
    
    /**
     * Class variable for the green color.
     */
    final public static Color3f GREEN = new Color3f(0.0f, 1.0f, 0.0f);

    /**
     * Class variable for the blue color.
     */
    final public static Color3f BLUE = new Color3f(0.0f, 0.0f, 1.0f);
    
    final public static int MODEL_FASTEST = 0;
    final public static int MODEL_NICEST = 1;
    final public static int MODEL_SHADE_FLAT = 2;
    final public static int MODEL_SHADE_GOURAUD = 3;
        
    final public static int TRANS_NONE = 0;
    final public static int TRANS_FASTEST = 1;
    final public static int TRANS_NICEST = 2;
    final public static int TRANS_SCREEN_DOOR = 3;
    final public static int TRANS_BLENDED = 4;    
    
    private Box box;

    public DisplayBoundingBox(BoundingBox boundingBox) {
        Point3d lower = new Point3d();
        Point3d upper = new Point3d();
        boundingBox.getLower(lower);
        boundingBox.getUpper(upper);
        
        Appearance appearance = new Appearance();
        appearance.setColoringAttributes(new ColoringAttributes(GREEN, MODEL_FASTEST));
        appearance.setTransparencyAttributes(new TransparencyAttributes(TRANS_FASTEST, 0.9f));

        box = new Box((float)(upper.x-lower.x)/2.0f, (float)(upper.y-lower.y)/2.0f, (float)(upper.z-lower.z)/2.0f, appearance);
                
        x = (upper.x+lower.x)/2.0f;
        y = (upper.y+lower.y)/2.0f;
        z = (upper.z+lower.z)/2.0f;            
    }
        
    public void changeColor(Color3f color) {
        Appearance appearance = box.getAppearance();
        ColoringAttributes attributes = appearance.getColoringAttributes();
        attributes.setColor(color);
        appearance.setColoringAttributes(attributes);
        box.setAppearance(appearance);
    }
        
    /**
     * Nothing needs to be updated.
     *
     * @param time the passed time in milliseconds
     */
    protected void updateModel(long time) {
        // do nothing        
    }
    
    /**
     * Render the line.
     *
     * @param gc3D the graphics contect 3D to render on
     */    
    protected void drawModel(GraphicsContext3D gc3D) {        
        gc3D.setAppearance(box.getAppearance());

        for(int i = 0; i <6; i++)
            gc3D.draw(box.getShape(i));
    }
    
}