skidmark.java

来自「Java 3D API, 一套完整的3d引擎」· Java 代码 · 共 53 行

import com.threed.jpct.*;
import java.io.*;

/**
 * A skidmark is something the car produces while driving around
 */
public class SkidMark extends AbstractEntity {

   private final static Object3D SKIDMARK;

   static {
      /**
      * Load all the textures required by this entity and initialize
      * a "blue print" for skidmarks.
      */
      Texture skidmark=new Texture("textures"+File.separatorChar+"skidmark.jpg");
      TextureManager.getInstance().addTexture("skidmark", skidmark);
      SKIDMARK=Primitives.getPlane(1, 8);
      SKIDMARK.rotateX((float) Math.PI/2f);
      SKIDMARK.rotateMesh();
      SKIDMARK.setTranslationMatrix(new Matrix());
      SKIDMARK.setTexture("skidmark");
      SKIDMARK.getMesh().compress();
      SKIDMARK.build();
   }

   /**
    * Creates a new skidmark
    */
   public SkidMark() {
      super(SKIDMARK);
      setVisibility(false);
      setTransparency(1);
   }


   /**
    * Places a skidmark. The skidmark has the same direction as the car.
    */
   public void place(int pos, Car car, SimpleVector sPos) {
      sPos=new SimpleVector(sPos);
      setRotationMatrix(car.getRotationMatrix().cloneMatrix());
      SimpleVector yAxis=getYAxis();
      SimpleVector xAxis=getXAxis();
      xAxis.scalarMul(pos*8);
      yAxis.scalarMul(4f*1.95f);
      sPos.add(xAxis);
      sPos.add(yAxis);
      setOrigin(sPos);
      setVisibility(true);
   }
}