applet1.java

是用java开发的一些程序原代码 是用java开发的一些程序原代码

package webpaint1;

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import com.borland.jbcl.layout.*;

public class Applet1 extends Applet {
  boolean isStandalone = false;
  BorderLayout borderLayout1 = new BorderLayout();
  Panel panel1 = new Panel();
  Button button1 = new Button();
  Button button2 = new Button();
  Button button3 = new Button();
  Button button4 = new Button();
  Label label1 = new Label();
  int startx,starty; //声明记录绘图起点的变量
  int userchoose=1; //声明记录用户图形选择的变量
  /**Get a parameter value*/
  public String getParameter(String key, String def) {
    return isStandalone ? System.getProperty(key, def) :
      (getParameter(key) != null ? getParameter(key) : def);
  }

  /**Construct the applet*/
  public Applet1() {
  }
  /**Initialize the applet*/
  public void init() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  /**Component initialization*/
  private void jbInit() throws Exception {
    this.setLayout(borderLayout1);
    button1.setLabel("直线");
    button1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button1_actionPerformed(e);
      }
    });
    button2.setLabel("圆形");
    button2.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button2_actionPerformed(e);
      }
    });
    button3.setLabel("矩形");
    button3.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button3_actionPerformed(e);
      }
    });
    button4.setLabel("圆角矩形");
    button4.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button4_actionPerformed(e);
      }
    });
    label1.setText("现在位置");
    this.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() {
      public void mouseMoved(MouseEvent e) {
        this_mouseMoved(e);
      }
    });
    this.addMouseListener(new java.awt.event.MouseAdapter() {
      public void mousePressed(MouseEvent e) {
        this_mousePressed(e);
      }
      public void mouseReleased(MouseEvent e) {
        this_mouseReleased(e);
      }
    });
    this.add(panel1, BorderLayout.NORTH);
    panel1.add(button1, null);
    panel1.add(button2, null);
    panel1.add(button3, null);
    panel1.add(button4, null);
    this.add(label1,  BorderLayout.SOUTH);
  }
  /**Get Applet information*/
  public String getAppletInfo() {
    return "Applet Information";
  }
  /**Get parameter info*/
  public String[][] getParameterInfo() {
    return null;
  }


  void this_mouseMoved(MouseEvent e) {
  //在标签组件上显示目前鼠标的位置
label1.setText("目前位置:"+e.getX()+","+e.getY());
  }

  void this_mousePressed(MouseEvent e) {
startx=e.getX();//记录单击鼠标时的鼠标指针x轴坐标位置
starty=e.getY();//记录单击鼠标时的鼠标指针y轴坐标位置
  }

//绘制圆形
  void this_mouseReleased(MouseEvent e) {
 Graphics mypaint=getGraphics();
switch (userchoose)
{
  case 1://画直线
        mypaint.drawLine(startx,starty,e.getX(),e.getY());
  break;
  case 2://画圆形
        mypaint.drawOval(startx,starty,e.getX()-startx,e.getY()-starty);
  break;
  case 3://画矩形
        mypaint.drawRect(startx,starty,e.getX()-startx,e.getY()-starty);
  break;
  case 4://画圆角矩形
        mypaint.drawRoundRect(startx,starty,e.getX()-startx,e.getY()-starty,20,20);
  break;
}
  }

  //直线按钮
  void button1_actionPerformed(ActionEvent e) {
userchoose=1;
  }
//圆形按钮
  void button2_actionPerformed(ActionEvent e) {
userchoose=2;
  }
//矩形按钮
  void button3_actionPerformed(ActionEvent e) {
userchoose=3;
  }
//圆角矩形按钮
  void button4_actionPerformed(ActionEvent e) {
userchoose=4;
  }
}