洛阳网站推广方式,设计网名的软件,小米发布会时间,电子工程职业学院我想在JFrame中或者Frame中添加一张背景图片#xff0c;然后在这图片上画出会移动的小球#xff0c;怎么实现#xff1f;我的代码把添加背景图片去掉#xff0c;小球就正常运行了#xff0c;怎么修改啊#xff1f;希望各位大侠指教不胜感激#xff01;#xff01;…我想在JFrame中或者Frame中添加一张背景图片然后在这图片上画出会移动的小球怎么实现我的代码把添加背景图片去掉小球就正常运行了怎么修改啊希望各位大侠指教不胜感激import java.awt.*;import java.awt.event.*;import javax.swing.*;public class TestItem extends JFrame {JLabel jl;Bullet b new Bullet(80,80);public static void main(String[] args) {new TestItem().lauchFrame();}public void lauchFrame() {jl new JLabel();ImageIcon image new ImageIcon(Images\\mainBack.png);jl.setIcon(image);jl.setBounds(0, 0, image.getIconWidth(), image.getIconHeight());this.setTitle(坦克大战);this.setSize(246, 350);this.setVisible(true);this.getLayeredPane().add(jl, new Integer(Integer.MIN_VALUE));((JPanel)getContentPane()).setOpaque(false);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);this.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {System.exit(0);}});this.setBackground(Color.black);new Thread(new paintThread()).start();this.addKeyListener(new keyMonitor());}public void paint(Graphics g) {b.draw(g);}private class paintThread implements Runnable {public void run() {while(true) {repaint();try {Thread.sleep(80);} catch (Exception e) {e.printStackTrace();}}}}private class keyMonitor extends KeyAdapter {public void keyPressed(KeyEvent e) {b.keyPressed(e);}public void keyReleased(KeyEvent e) {b.keyReleased(e);}}}import java.awt.Color;import java.awt.Graphics;import java.awt.event.KeyEvent;public class Bullet {private int x;private int y;private static final int width 16;private static final int height 16;private static final int speed 8;Direction dir Direction.D;private boolean bU false,bR false,bD false,bL false;public Bullet(int x, int y) {this.x x;this.y y;}public int getX() {return x;}public void setX(int x) {this.x x;}public int getY() {return y;}public void setY(int y) {this.y y;}public void draw(Graphics g) {Color c g.getColor();g.setColor(Color.yellow);g.fillOval(x, y, width, height);g.setColor(c);move();}private void move() {switch(dir) {case U:y - speed;break;case R:x speed;break;case D:y speed;break;case L:x - speed;break;}}public void keyPressed(KeyEvent e) {switch(e.getKeyCode()) {case KeyEvent.VK_UP:bU true;break;case KeyEvent.VK_RIGHT:bR true;break;case KeyEvent.VK_DOWN:bD true;break;case KeyEvent.VK_LEFT:bL true;break;}licalDirection();}private void licalDirection() {if(bU !bR !bD !bL) {dir Direction.U;} else if(!bU bR !bD !bL) {dir Direction.R;} else if(!bU !bR bD !bL) {dir Direction.D;} else if(!bU !bR !bD bL) {dir Direction.L;}}public void keyReleased(KeyEvent e) {switch(e.getKeyCode()) {case KeyEvent.VK_UP:bU false;break;case KeyEvent.VK_RIGHT:bR false;break;case KeyEvent.VK_DOWN:bD false;break;case KeyEvent.VK_LEFT:bL false;break;}licalDirection();}}public enum Direction {U,R,D,L;}
