Java AWT（Applet）应用示例 - 持续更新

末蓝、 2022-04-06 09:09 206阅读 0赞

import java.awt.*;
    import java.awt.event.*;
    import java.applet.*;
    
    public class ArcTest extends Applet implements WindowListener{
       
    	ArcControls controls;
    
    	public static void main(String args[]){
       
    		Frame f = new Frame("ArcTest");
    		ArcTest arcTest = new ArcTest();
    
    		arcTest.init();
    		arcTest.start();
    
    		f.add("Center", arcTest);
    		f.setSize(300, 300);
    		f.addWindowListener(arcTest);
    
    		//f.show();
    		f.setVisible(true);
        }
    
    	//Override Applet Methods
    	@Override
    	public void init(){
       
    		setLayout(new BorderLayout());
    		ArcCanvas c = new ArcCanvas();
    		add("Center", c);
    		add("South", controls = new ArcControls(c));
    	}
    
    	@Override
    	public void start(){
       
    		controls.setEnabled(true);
    	}
    
    	@Override
    	public void stop(){
       
    		controls.setEnabled(false);
    	}
    
    	//Override WindowListener Methods
    	@Override
        public void windowActivated(WindowEvent e)//当窗口从非激活到激活状态时监视器调用该方法
        {
       
        }
    
        @Override
        public void windowClosed(WindowEvent e)//当窗口关闭时
        {
       
        }
    
        @Override
        public void windowClosing(WindowEvent e)//窗口正被关闭
        {
       
            // 退出
            System.exit(0);
        }
    
        @Override
        public void windowDeactivated(WindowEvent e)//激活到非激活状态
        {
       
        }
    
        @Override
        public void windowDeiconified(WindowEvent e)//当窗口撤销图标化时
        {
       
        }
    
        @Override
        public void windowIconified(WindowEvent e)//当窗口图标化时
        {
       
        }
    
        @Override
        public void windowOpened(WindowEvent e)//当窗口打开时
        {
       
        }
    }
    
    class ArcCanvas extends Canvas{
       
    	int startAngle = 0;
    	int endAngle = 45;
    	boolean filled = false;
    	Font font;
    
    	public void paint(Graphics g){
       
    		Rectangle r = getBounds();
    		int hlines = r.height / 10;
    		int vlines = r.width /10;
    
    		System.out.print("height = ");
    		System.out.println(r.height);
    		System.out.print("nwidth = ");
    		System.out.println(r.width);
    
    		g.setColor(Color.pink);
    
    		for (int i = 1; i <= hlines; i++){
       
    			g.drawLine(0, i*10, r.width, i*10);
    		}
    
    		for (int i = 1; i<= vlines; i++){
       
    			g.drawLine(i*10, 0, i*10, r.height);
    		}
    
    		g.setColor(Color.red);
    		if (filled){
       
    			g.fillArc(0, 0, r.width-1, r.height-1, startAngle, endAngle);
    		} else {
       
    			g.drawArc(0, 0, r.width-1, r.height-1, startAngle, endAngle);
    		}
    
    		g.setColor(Color.black);
    		g.setFont(font);
    		g.drawLine(0, r.height/2, r.width, r.height/2);
    		g.drawLine(r.width/2, 0, r.width/2, r.height);
    		g.drawLine(0, 0, r.width, r.height);
    		g.drawLine(r.width, 0, 0, r.height);
    
    		int sx = 10;
    		int sy = r.height - 28;
    		g.drawString("S = " + startAngle, sx, sy);
    		g.drawString("N = " + endAngle, sx, sy + 14);
    	}
    
    	public void redraw(boolean filled, int start, int end){
       
    		this.filled = filled;
    		this.startAngle = start;
    		this.endAngle = end;
    		repaint();
    	}
    }
    
    class ArcControls extends Panel implements ActionListener{
       
    	TextField s;
    	TextField e;
    	ArcCanvas canvas;
    
    	public ArcControls(ArcCanvas canvas){
       
    		Button b = null;
    		this.canvas = canvas;
    
    		add(s = new TextField("30", 4));
    		add(e = new TextField("90", 4));
    
    		b = new Button("Fill");
    		b.addActionListener(this);
    		add(b);
    
    		b = new Button("Draw");
    		b.addActionListener(this);
    		add(b);
    
    		canvas.redraw(true, 
    			         Integer.parseInt(s.getText().trim()),
    					 Integer.parseInt(e.getText().trim()));
    	}
    
    	@Override
    	public void actionPerformed(ActionEvent ev){
       
    		String label = ev.getActionCommand();
    		System.out.println(label);
    
    		canvas.redraw(label.equals("Fill"),
    		             Integer.parseInt(s.getText().trim()),
    					 Integer.parseInt(e.getText().trim()));
    	}
    }

javac -encoding UTF-8 -Xlint:deprecation ArcTest.java

jar cvf ArcTest.jar ArcControls.class ArcCanvas.class ArcTest.class

java ArcTest