会爬行的小乌龟

绝地灬酷狼 2021-09-30 01:54 285阅读 0赞

**一 代码**

import java.awt.*;
    import java.awt.event.*;
    public class DrawTurtle
    {
        private int x, y;
    
        public static void main(String[] args)
        {
            new DrawTurtle();
        }
    
        public DrawTurtle()
        {
            x = 100;
            y = 10;
            Frame frame = new Frame("DrawTurtle");
            DrawLittleTurtle turtle = new DrawLittleTurtle();
            frame.add(turtle);
            frame.setSize(500, 500);
            frame.setVisible(true);
            frame.addWindowListener(new WindowAdapter()
            {
                public void windowClosing(WindowEvent e)
                {
                    System.exit(0);
                }
            });
            turtle.requestFocus();
            turtle.addKeyListener(new KeyAdapter()
            {
                public void keyPressed(KeyEvent e)
                {
                    if (e.getKeyCode() == KeyEvent.VK_UP)
                    {
                        y -= 10;
                    }
                    if (e.getKeyCode() == KeyEvent.VK_LEFT)
                    {
                        x -= 10;
                    }
                    if (e.getKeyCode() == KeyEvent.VK_RIGHT)
                    {
                        x += 10;
                    }
                    if (e.getKeyCode() == KeyEvent.VK_DOWN)
                    {
                        y += 10;
                    }
                    turtle.repaint();
                }
            });
        }
    
        class DrawLittleTurtle extends Canvas
        {
            public void paint(Graphics g)
            {
                g.setColor(Color.YELLOW);               // 乌龟四条腿
                g.fillOval(x + 0, y + 40, 30, 30);
                g.fillOval(x + 90, y + 40, 30, 30);
                g.fillOval(x + 0, y + 110, 30, 30);
                g.fillOval(x + 90, y + 110, 30, 30);
                g.fillOval(x + 50, y + 130, 20, 50);    // 乌龟尾巴
                g.fillOval(x + 40, y + 0, 40, 70);      // 乌龟头
                g.setColor(Color.BLACK);
                g.fillOval(x + 50, y + 15, 5, 5);
                g.fillOval(x + 65, y + 15, 5, 5);
                g.setColor(Color.GREEN);                // 乌龟壳
                g.fillOval(x + 10, y + 30, 100, 120);
                g.setColor(Color.BLACK);
                g.drawLine(x + 24, y + 50, x + 40, y + 67);
                g.drawLine(x + 97, y + 50, x + 80, y + 67);
                g.drawLine(x + 24, y + 130, x + 40, y + 113);
                g.drawLine(x + 97, y + 130, x + 80, y + 113);
                g.drawLine(x + 40, y + 67, x + 80, y + 67);
                g.drawLine(x + 40, y + 113, x + 80, y + 113);
                g.drawLine(x + 10, y + 90, x + 110, y + 90);
                g.drawLine(x + 60, y + 30, x + 60, y + 150);
            }
        }
    }

**二 运行**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70][]

**三 改进版——使用了双缓冲技术**

import java.awt.*;
    import java.awt.event.*;
    public class DrawTurtle
    {
        private int x, y;
    
        public static void main(String[] args)
        {
            new DrawTurtle();
        }
    
        public DrawTurtle()
        {
            x = 100;
            y = 10;
            Frame frame = new Frame("DrawTurtle");
            DrawLittleTurtle turtle = new DrawLittleTurtle();
            frame.add(turtle);
            frame.setSize(500, 500);
            frame.setVisible(true);
            frame.addWindowListener(new WindowAdapter()
            {
                public void windowClosing(WindowEvent e)
                {
                    System.exit(0);
                }
            });
            turtle.requestFocus();
            turtle.addKeyListener(new KeyAdapter()
            {
                public void keyPressed(KeyEvent e)
                {
                    if (e.getKeyCode() == KeyEvent.VK_UP)
                    {
                        y -= 10;
                    }
                    if (e.getKeyCode() == KeyEvent.VK_LEFT)
                    {
                        x -= 10;
                    }
                    if (e.getKeyCode() == KeyEvent.VK_RIGHT)
                    {
                        x += 10;
                    }
                    if (e.getKeyCode() == KeyEvent.VK_DOWN)
                    {
                        y += 10;
                    }
                    turtle.repaint();
                }
            });
        }
    
        class DrawLittleTurtle extends Canvas
        {
            private Image image;
    
            public void paint(Graphics g)
            {
                drawBufferedImage();
                g.drawImage(image, 0, 0, this);
            }
    
            private void drawBufferedImage()
            {
                image = createImage(this.getWidth(), this.getHeight());
                Graphics g = image.getGraphics();
                g.setColor(Color.YELLOW);               // 乌龟四个腿
                g.fillOval(x + 0, y + 40, 30, 30);
                g.fillOval(x + 90, y + 40, 30, 30);
                g.fillOval(x + 0, y + 110, 30, 30);
                g.fillOval(x + 90, y + 110, 30, 30);
                g.fillOval(x + 50, y + 130, 20, 50);    // 乌龟尾巴
                g.fillOval(x + 40, y + 0, 40, 70);      // 乌龟头
                g.setColor(Color.BLACK);
                g.fillOval(x + 50, y + 15, 5, 5);
                g.fillOval(x + 65, y + 15, 5, 5);
                g.setColor(Color.GREEN);                // 乌龟壳
                g.fillOval(x + 10, y + 30, 100, 120);
                g.setColor(Color.BLACK);
                g.drawLine(x + 24, y + 50, x + 40, y + 67);
                g.drawLine(x + 97, y + 50, x + 80, y + 67);
                g.drawLine(x + 24, y + 130, x + 40, y + 113);
                g.drawLine(x + 97, y + 130, x + 80, y + 113);
                g.drawLine(x + 40, y + 67, x + 80, y + 67);
                g.drawLine(x + 40, y + 113, x + 80, y + 113);
                g.drawLine(x + 10, y + 90, x + 110, y + 90);
                g.drawLine(x + 60, y + 30, x + 60, y + 150);
            }
    
        }
    }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70]: /images/20210724/ba1ac46293ff43eab0e59e0f6aad1183.png