会爬行的小乌龟

最新推荐文章于 2022-03-22 20:25:14 发布

chengqiuming

最新推荐文章于 2022-03-22 20:25:14 发布

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分类专栏： java 文章标签： Java

本文链接：https://blog.youkuaiyun.com/chengqiuming/article/details/96738968

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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

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);
        }

    }
}