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| package snack;
import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.util.Random;
public class GamePanel extends JPanel implements KeyListener, ActionListener {
int length; int[] snakeX = new int[600]; int[] snakeY = new int[500]; String fx = "R"; boolean isStart = false; boolean isFail = false;
int foodx; int foody; Random random = new Random();
Timer timer = new Timer(100, this);
int score;
public GamePanel(){ init(); this.setFocusable(true); this.addKeyListener(this); timer.start(); }
public void init(){ length = 3; snakeX[0] = 100; snakeY[0] = 125; snakeX[1] = 75; snakeY[1] = 125; snakeX[2] = 50; snakeY[2] = 125;
foodx = 25 + 25 * random.nextInt(34); foody = 125 + 25 * random.nextInt(25);
score = 0; }
@Override protected void paintComponent(Graphics g) { super.paintComponent(g); this.setBackground(Color.white); Data.header.paintIcon(this,g,25,10); g.fillRect(25,125,850,625);
if (fx.equals("R")){ Data.right.paintIcon(this,g,snakeX[0],snakeY[0]); }else if (fx.equals("L")){ Data.left.paintIcon(this,g,snakeX[0],snakeY[0]); }else if (fx.equals("U")){ Data.up.paintIcon(this,g,snakeX[0],snakeY[0]); }else if (fx.equals("D")){ Data.down.paintIcon(this,g,snakeX[0],snakeY[0]); } for (int i = 1; i < length; i++) { Data.body.paintIcon(this,g,snakeX[i],snakeY[i]); }
if (isStart==false){ g.setColor(Color.white); g.setFont(new Font("微软雅黑",Font.BOLD,40)); g.drawString("按下空格开始游戏!",300,300); }
Data.food.paintIcon(this,g,foodx,foody);
g.setColor(Color.white); g.setFont(new Font("微软雅黑",Font.BOLD,18)); g.drawString("长度: " + length,750,35); g.drawString("分数: " + score,750,50);
if(isFail){ g.setColor(Color.RED); g.setFont(new Font("微软雅黑",Font.BOLD,40)); g.drawString("失败, 按下空格重新开始",200,300); } }
@Override public void keyPressed(KeyEvent e) { int keyCode = e.getKeyCode();
if (keyCode==KeyEvent.VK_SPACE){ if (isFail){ isFail = false; init(); }else { isStart = !isStart; } repaint(); }
if (keyCode==KeyEvent.VK_LEFT){ fx = "L"; }else if (keyCode==KeyEvent.VK_RIGHT){ fx = "R"; }else if (keyCode==KeyEvent.VK_UP){ fx = "U"; }else if (keyCode==KeyEvent.VK_DOWN){ fx = "D"; }
}
@Override public void keyReleased(KeyEvent e) {
}
@Override public void keyTyped(KeyEvent e) {
}
@Override public void actionPerformed(ActionEvent e) { if (isStart && isFail==false) { for (int i = length - 1; i > 0; i--) { snakeX[i] = snakeX[i - 1]; snakeY[i] = snakeY[i - 1]; } if (fx.equals("R")) { snakeX[0] = snakeX[0] + 25; if (snakeX[0] > 850) snakeX[0] = 25; } else if (fx.equals("L")) { snakeX[0] = snakeX[0] - 25; if (snakeX[0] < 25) snakeX[0] = 850; } else if (fx.equals("U")) { snakeY[0] = snakeY[0] - 25; if (snakeY[0] < 125) snakeY[0] = 725; } else if (fx.equals("D")) { snakeY[0] = snakeY[0] + 25; if (snakeY[0] > 725) snakeY[0] = 125; }
if (snakeX[0]==foodx && snakeY[0]==foody){ length++; foodx = 25 + 25 * random.nextInt(34); foody = 125 + 25 * random.nextInt(25); }
for (int i = 1; i < length; i++) { if (snakeX[i]==snakeX[0] && snakeY[i]==snakeY[0] ){ isFail = true; } }
repaint(); } timer.start(); } }
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