movetest6.java

JAVA与EAI的结合,控制VRML场景中的物体,利用鼠标拖动物体.

import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import vrml.external.*;
import vrml.external.field.*;
import vrml.external.exception.*;


public class MoveTest6 extends Applet implements EventOutObserver{
  Browser theBrowser = null;
  float[] Posit = {0, 0, 0};
  boolean Active=false;
  float[] hitPoin=new float[3];
  public void init() {


      try {
        theBrowser = Browser.getBrowser(this);
        Node Locator = theBrowser.getNode("Tch1");
        EventOut OutLocator1 = Locator.getEventOut("hitPoint_changed");
        OutLocator1.advise(this, "hitPoint");
        EventOut OutLocator2 = Locator.getEventOut("isActive_changed");
        OutLocator2.advise(this, "isActive");

      }

      catch (Exception e) {
        System.out.println("实例获取失败！");
        try {
          Thread.sleep(200);
        }
        catch (InterruptedException eX) {

        }
      }
    }

  public void callback(EventOut event, double time, Object data) {

    if (data.toString()=="isActive") {
       Active=( (EventOutSFBool) event).getValue();
        }
    if ((data.toString()=="hitPoint")&&Active){
       Node Obj1 = theBrowser.getNode("Obj1");
       EventInSFVec3f trans1 = (EventInSFVec3f) Obj1.getEventIn(
        "set_translation");
       hitPoin = ( (EventOutSFVec3f) event).getValue();
       trans1.setValue(hitPoin);
     }
    }
}