javacoursedesign.java

java版话土工具 可以话好几种图形圆,长方行,

package kao;


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

public class javacoursedesign extends Frame implements ActionListener,TextListener{

         String des[]={"红色","蓝色","绿色","灰色","黑色"};                 //设置字体
         Color c[]={Color.red,Color.blue,Color.green,Color.gray,Color.black};     
         String wds[]={"华文彩云","华文行楷","隶书","方正舒体","幼圆"};
         String ziti="宋体";
         String s="";
         int daxiao=45;
         String sz[]={"20","30","40","50","60"};
         int star;
         private int orginx;private int orginy;private int x,y;
         protected int lastx=0,lasty=0;
         Label hint1;
         Label hint2;
         Label hint3;
         Color scolor=Color.black;  //初始颜色
         TextField shuru;
         Button triangular;
         Button rect;                //按钮
         Button circle;
         Button clear;
         Button line;
         private Image offscreens; //双缓冲用的Image
         private Graphics og;    //双缓冲用的Graphics
         public javacoursedesign(){
             Menu file = new Menu("file"); //创建菜单
             Menu help = new Menu("help");
             MenuBar menubar = new MenuBar();
             setMenuBar(menubar);
             menubar.add(file);
             menubar.add(help);
             MenuItem save = new MenuItem("save");
             MenuItem open = new MenuItem("open");
             MenuItem  del=new MenuItem("清除");
             file.add(save); //添加菜单至容器
             file.add(open);
             file.addSeparator();
             file.add(del);            
             this.addWindowListener(new WindowAdapter() { //添加关闭窗口动作
                 public void windowClosing(WindowEvent e) {
                     Frame frm = (Frame) (e.getSource());
                     frm.dispose();
                 }
             });
             triangular = new Button("三角型");
             rect = new Button("矩形");
             circle = new Button("圆形");
             clear = new Button("清除");
             line=new Button("直线");
             hint1 = new Label("字体");
             hint2 = new Label("颜色");
             hint3 = new Label("大小");
             Choice font = new Choice();                               //创建下拉菜单,并把相应数组元素添加至里
             for (int i = 0; i < wds.length; i++) {
                 font.add(wds[i]);
             }
              Choice color = new Choice();
             for (int i = 0; i < des.length; i++) {
                 color.add(des[i]);
             }

            Choice size = new Choice();
             for (int i = 0; i < sz.length; i++) {
                 size.add(sz[i]);
             }
             setLayout(new BorderLayout());            //才用flowLayout布局
             Panel p2=new Panel();
             shuru=new TextField(25);
             Panel p1 = new Panel();                     //创建面板
             p1.setLayout(new GridLayout(1, 10));
             p1.add(rect);
             p1.add(circle);
             p1.add(line);
             p1.add(triangular);
             p1.add(clear);
             p1.add(hint1);
             p1.add(font);
             p1.add(hint2);
             p1.add(color);
             p1.add(hint3);
             p1.add(size);
             this.add("North",p1);
             p2.add(shuru);
             this.add("South",p2);             
             shuru.addTextListener(this);shuru.addActionListener(this);         //为文本框注册事件监听者
             rect.addActionListener(new ActionListener()               //为按钮注册事件监听者
              {
                 public void actionPerformed(ActionEvent e)
              {
                 star=1;
              }
              });
              circle.addActionListener(new ActionListener()
             {
                public void actionPerformed(ActionEvent e)
             {
                star=2;
             }
             });
             line.addActionListener(new ActionListener()
             {
                 public void actionPerformed(ActionEvent e)
                 {
                     star = 3;
                 }
             });
             clear.addActionListener(new ActionListener()
             {
                 public void actionPerformed(ActionEvent e) {
                     star = 4;
                 }
             });
             triangular.addActionListener(new ActionListener()
             {
                 public void actionPerformed(ActionEvent e)
                 {
                     star = 5;
                 }
             });
             font.addItemListener(new ItemListener(){                          //处理下拉菜单事件
                public void itemStateChanged(ItemEvent e) {                   
                   Choice temp=(Choice)e.getItemSelectable();    
                    for(int i=0;i<wds.length;i++){                            //处理字体改变
                      if(temp.getSelectedIndex()==i){
                        ziti=wds[i];
                        break;
                    }
                   }
                }
              });
             color.addItemListener(new ItemListener(){
                public void itemStateChanged(ItemEvent e) {                   
                   Choice temp=(Choice)e.getItemSelectable();    
                    for(int i=0;i<wds.length;i++){                            //处理字体改变
                      if(temp.getSelectedIndex()==i){
                        scolor=c[i];
                        break;
                    }
                   }
                }
              });
            size.addItemListener(new ItemListener(){
                public void itemStateChanged(ItemEvent e) {                
                   Choice temp=(Choice)e.getItemSelectable();    
                    for(int i=0;i<wds.length;i++){                            //处理字体改变
                      if(temp.getSelectedIndex()==i){
                        daxiao=Integer.parseInt(sz[i]);
                        break;
                    }
                   }
                }
              });
             del.addActionListener(this);

             this.addMouseMotionListener(new MouseMotionAdapter() {
                 public void mouseDragged(MouseEvent e) {

                     x = e.getX();
                     y = e.getY();
                     repaint();

                 }

             });           
             this.addMouseListener(new MouseAdapter() {
                 public void mousePressed(MouseEvent e) {
                     orginx = e.getX();
                     orginy = e.getY();
                     Graphics g=getGraphics();
                     Font myfont=new Font(ziti,Font.BOLD,daxiao);       //创建字体对象的一个实例
                     g.setFont(myfont);                                   //确定使用的字体
                     g.setColor(scolor);
                     g.drawString(s,orginx,orginy);
                 }
                 public void mouseReleased(MouseEvent arg0) {
                        
						switch(star){                            //将图像保存到双缓冲区
                            case 1:
                                og.setColor(scolor);
                                og.drawRect(Math.min(orginx,x),Math.min(orginy,y),Math.abs(x-orginx),Math.abs(y-orginy));
                                break;
                            case 2:
                                og.setColor(scolor);
                                og.drawOval(Math.min(orginx,x),Math.min(orginy,y),Math.abs(x-orginx),Math.abs(y-orginy));
                                break;
                            case 3:
                                og.setColor(scolor);
                                og.drawLine(orginx,orginy,x,y);
                                break;
                            case 4:
                            	
                                og.setColor(Color.white);
                                og.fillRect(Math.min(orginx,x),Math.min(orginy,y),Math.abs(x-orginx),Math.abs(y-orginy));
                                break;
                            case 5:
                            	og.setColor(Color.white);
                            	og.drawLine((int)((x+orginx)/2),Math.min(y,orginy),Math.max(x,orginx),Math.max(y,orginy)); 
                                og.drawLine(Math.max(x,orginx),Math.max(y,orginy),Math.min(x,orginx),Math.max(y,orginy)); 
                                og.drawLine(Math.min(x,orginx),Math.max(y,orginy),(int)((x+orginx)/2),Math.min(y,orginy)); 
                        }

                    }

                });
           this.setSize(780,450);
           this.setVisible(true);
           offscreens=createImage(getSize().width,getSize().height);          //创建与面板同样大小的缓冲区
           og=offscreens.getGraphics();
     }
        public void textValueChanged(TextEvent e){                            //为文本框加入事件
            if(e.getSource()==shuru){
                 s=" "+shuru.getText();
          }
        }   
         public void paint(Graphics g){
            super.paint(g);
            g.drawImage(offscreens,0,0,this);         
            switch(star){                                         //对应SWITCH方法双缓冲画不同的图形
               case 1:
                g.setColor(scolor);
                g.drawRect(Math.min(orginx,x),Math.min(orginy,y),Math.abs(x-orginx),Math.abs(y-orginy));
                break;
               case 2:
                g.setColor(scolor);
                g.drawOval(Math.min(orginx,x),Math.min(orginy,y),Math.abs(x-orginx),Math.abs(y-orginy));
                break;
              case 3:
                  g.setColor(scolor);
                  g.drawLine(orginx,orginy,x,y);
                  break;
              case 4:
                  g.setColor(Color.white);
                  g.fillRect(Math.min(orginx,x),Math.min(orginy,y),Math.abs(x-orginx),Math.abs(y-orginy));
                  break;
              case 5:
            	  g.setColor(Color.white);
            	  g.drawLine((int)((x+orginx)/2),Math.min(y,orginy),Math.max(x,orginx),Math.max(y,orginy)); 
                  g.drawLine(Math.max(x,orginx),Math.max(y,orginy),Math.min(x,orginx),Math.max(y,orginy)); 
                  g.drawLine(Math.min(x,orginx),Math.max(y,orginy),(int)((x+orginx)/2),Math.min(y,orginy)); 
             }

        }
        public void actionPerformed(ActionEvent e){                               //为菜单中的清除项添加事件
                 Graphics g=this.getGraphics();
                 if(e.getActionCommand()=="清除"){
                     g.setColor(Color.white);
                     og.setColor(Color.white);
                     og.fillRect(0,0,this.getSize().width,this.getSize().height);
                     g.fillRect(0,0,this.getSize().width,this.getSize().height);
                 }
        }
         public static void main(String[] args){
            new javacoursedesign();
            
        }
}