draw.java

Jbuilder100个例子 都是经典例子 对大家学习Jbuilder非常有帮助

package line;

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class draw extends Applet {
  Point spoint;
  Point points[];
  int nump;
  boolean drawing = false;
  boolean isStandalone = false;
  /**Get a parameter value*/
  public String getParameter(String key, String def) {
    return isStandalone ? System.getProperty(key, def) :
      (getParameter(key) != null ? getParameter(key) : def);
  }
  public void init(){
     spoint=new Point(0,0);
     points=new Point[1000];
     nump=0;
     drawing=false;
  }
  public boolean handleEvent(Event e){
     switch(e.id){
        case Event.MOUSE_DOWN :
               drawing=true;
               spoint.x=e.x;
               spoint.y=e.y;
            return true;
        case Event.MOUSE_MOVE :
            if((drawing)&&(nump<1000)){
                  points[nump]=new Point(e.x,e.y);
                  ++nump;
                  repaint();
             }
             return true;
         default:
              return false;
      }
  }
  public void paint(Graphics g){
     int oldx=spoint.x;
     int oldy=spoint.y;
     for(int x=0;x<nump;++x){
         g.drawLine(oldx,oldy,points[x].x,points[x].y);
         oldx=points[x].x;
         oldy=points[x].y;
      }
   }
  /**Construct the applet*/
  public draw() {
  }
  /**Initialize the applet*/

  /**Component initialization*/
  private void jbInit() throws Exception {
  }
  /**Get Applet information*/
  public String getAppletInfo() {
    return "Applet Information";
  }
  /**Get parameter info*/
  public String[][] getParameterInfo() {
    return null;
  }
}