Java入门贪吃蛇小游戏.zip

package com.zcz.view; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import javax.swing.JPanel; import com.zcz.model.DirectEnum; import com.zcz.model.GameLogic; import com.zcz.model.Location; import com.zcz.model.SnakeBodyPoint; import com.zcz.utils.ThreadUtils; /** * The game panel. * * @author zhangchizhan * @since 2020/12/8 */ public class GamePanel extends JPanel implements Runnable, KeyListener { private static final long serialVersionUID = 629752198065812670L; GameLogic gameLogic; int panelWidth, panelHeight; int pointWidth, pointHeight; boolean gameIsRunning; boolean showGameOverLabel; int moveSpeed; boolean speedWaitToChange; public GamePanel(int panelWidth, int panelHeight, int horizontalGrids, int verticalGrids) { super(); this.moveSpeed = 1; this.speedWaitToChange = false; this.gameIsRunning = false; this.showGameOverLabel = false; this.panelWidth = panelWidth; this.panelHeight = panelHeight; this.pointWidth = (int)(panelWidth / horizontalGrids); this.pointHeight = (int)(panelHeight / verticalGrids); this.gameLogic = new GameLogic(horizontalGrids, verticalGrids); gameLogic.init(); } @Override public void run() { gameIsRunning = true; while (gameIsRunning) { // Check whether the game is over. if (gameLogic.checkIfGameOver()) { gameIsRunning = false; showGameOverLabel = true; break; } // Expand snake body if its head can attach the next point or step the snake body. if (gameLogic.checkCanExpand()) { gameLogic.expandBody(); gameLogic.genDefaultNextPoint(); } else { gameLogic.stepSnakeBody(); } // Repaint the screen. This function will automatically call function "paint()". repaint(); ThreadUtils.sleep((long)(300 / moveSpeed)); } // Show game over screen. The game over label will keep twinkling. while (true) { repaint(); this.showGameOverLabel = !this.showGameOverLabel; ThreadUtils.sleep(500); } } public void paint(Graphics g) { super.paint(g); drawBackground(g); if (gameIsRunning) { drawSnake(g); } else { drawGameOver(g); } } private void drawBackground(Graphics g) { g.setColor(new Color(238, 232, 170)); g.fillRect(0, 0, panelWidth, panelHeight); } private void drawSnake(Graphics g) { // Draw snake body. g.setColor(Color.GREEN); for(SnakeBodyPoint sbp : gameLogic.getSnakeBodyPoints()) { drawPoint(g, sbp.getLocation()); } // Draw the next point. g.setColor(Color.RED); drawPoint(g, gameLogic.getNextPoint().getLocation()); } private void drawPoint(Graphics g, Location loc) { g.fill3DRect( loc.width * pointWidth, loc.height * pointHeight, pointWidth, pointHeight, false ); } private void drawGameOver(Graphics g) { if (showGameOverLabel) { // Show game over label. g.setColor(new Color(255, 20, 147)); g.setFont(new Font("Times New Roman", Font.BOLD, 50)); g.drawString("GAME OVER!", 250, 380); } g.setColor(Color.BLACK); g.setFont(new Font("Times New Roman", Font.BOLD, 20)); g.drawString("Press any key to exit...", 300, 500); } @Override public void keyPressed(KeyEvent arg0) { if (!gameIsRunning) return; boolean directChanges = false; SnakeBodyPoint head = gameLogic.getSnakeHead(); DirectEnum headLastMoveDirect = head.getLastMoveDirection(); if(arg0.getKeyCode() == KeyEvent.VK_UP && headLastMoveDirect != DirectEnum.DOWN) { // up head.setDirection(DirectEnum.UP); directChanges = true; } else if(arg0.getKeyCode() == KeyEvent.VK_DOWN && headLastMoveDirect != DirectEnum.UP) { // down head.setDirection(DirectEnum.DOWN); directChanges = true; } else if(arg0.getKeyCode() == KeyEvent.VK_LEFT && headLastMoveDirect != DirectEnum.RIGHT) { // left head.setDirection(DirectEnum.LEFT); directChanges = true; } else if(arg0.getKeyCode() == KeyEvent.VK_RIGHT && headLastMoveDirect != DirectEnum.LEFT) { // right head.setDirection(DirectEnum.RIGHT); directChanges = true; } if (directChanges) { if (speedWaitToChange) { moveSpeed = 3; } else { speedWaitToChange = true; } } } @Override public void keyReleased(KeyEvent arg0) { moveSpeed = 1; speedWaitToChange = false; } @Override public void keyTyped(KeyEvent arg0) { if (!gameIsRunning) { System.exit(0); } else { keyPressed(arg0); keyReleased(arg0); } } }