snakethread.java

手机游戏贪吃蛇

import java.util.Random;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.game.GameCanvas;
public class SnakeThread extends GameCanvas implements Runnable{
	Graphics g;
	boolean isRun;
	SnakeImg img;
	Map map;
	int headX = 64;
	int headY = 64;
	int headMoveSign;
	int canpassSign;
	int bodyMoveSign;
	int changePointNum;
	int[] changePointX = new int[100];
	int[] changePointY = new int[100];
	int[] changePointSign = new int[100];
	long gamestarttime;
	long timeSinceStart;
	int x = 8;
	int y = 8;
	int tailX;
	int tailY;
	int foodX;
	int foodY;
	Random r = new Random();
	public SnakeThread() {
		super(true);
		g = getGraphics();
		img = new SnakeImg();
		map = new Map();
		start();
	}
	public void start(){
		isRun = true;
		Thread t = new Thread(this);
		t.start();
	}
	public void run() {
		setfood();
		map.mBackground.setCell(x, y-3, 1);
		map.mBackground.setCell(x, y-2, 1);
		map.mBackground.setCell(x, y-1, 1);
		while(isRun == true){
			gamestarttime = System.currentTimeMillis();
			paintAll();
			gameOver();
			if(timeSinceStart < 100){
				 try{
					 Thread.sleep(100 - timeSinceStart);
				 }catch(InterruptedException ie){}
			}
		}
		
	}
	public void paintAll(){
		g.setColor(220,220,220);
		g.fillRect(0, 0, 156, 156);
		g.setColor(255,255,255);
		g.fillRect(8, 8, 128, 128);
		map.mBackground.paint(g);
		img.headSprite.setPosition(headX, headY);
		img.headSprite.paint(g);
		bodyMove();
		headMove();
		img.foodSprite.paint(g);
		flushGraphics();
	}
	public void headMove(){
		if(headMoveSign == 0){
			headY = headY + 8;
			map.mBackground.setCell(headX/8, headY/8-1, 1);	
		}
		else if(headMoveSign == 1){
			headX = headX + 8;	
			map.mBackground.setCell(headX/8-1, headY/8, 1);
		}
		else if(headMoveSign == 2){
			headY = headY - 8;	
			map.mBackground.setCell(headX/8, headY/8+1, 1);
		}
		else if(headMoveSign == 3){
			headX = headX - 8;	
			map.mBackground.setCell(headX/8+1, headY/8, 1);
		}
		if(headY > 128){
			headY = 8;
		}
		else if(headY < 8){
			headY = 128;
		}
		else if(headX > 128){
			headX = 8;
		}
		else if(headX < 8){
			headX = 128;
		}
		int keyState = getKeyStates();
		if((keyState & DOWN_PRESSED) != 0){
			canpassSign = 0;
			if(headMoveSign - canpassSign != 2){
				headMoveSign = canpassSign;
				changePointX[changePointNum] = headX/8;
				changePointY[changePointNum] = headY/8;
				changePointSign[changePointNum] = canpassSign;
				changePointNum++;
			}
			
		}
		else if((keyState & RIGHT_PRESSED) != 0){
			canpassSign = 1;
			if(headMoveSign - canpassSign != 2){
				headMoveSign = canpassSign;
				changePointX[changePointNum] = headX/8;
				changePointY[changePointNum] = headY/8;
				changePointSign[changePointNum] = canpassSign;
				changePointNum++;
			}
			
		}
		else if((keyState & UP_PRESSED) != 0){
			canpassSign = 2;
			if(headMoveSign - canpassSign != -2){
				headMoveSign = canpassSign;
				changePointX[changePointNum] = headX/8;
				changePointY[changePointNum] = headY/8;
				changePointSign[changePointNum] = canpassSign;
				changePointNum++;
			}
			
		}
		else if((keyState & LEFT_PRESSED) != 0){
			canpassSign = 3;
			if(headMoveSign - canpassSign != -2){
				headMoveSign = canpassSign;
				changePointX[changePointNum] = headX/8;
				changePointY[changePointNum] = headY/8;
				changePointSign[changePointNum] = canpassSign;
				changePointNum++;
			}
			
		}
	}

	public void bodyMove(){
		if(bodyMoveSign == 0){
			if(img.headSprite.collidesWith(img.foodSprite, true)){
				setfood();
			}
			else{
				y++;
			}
			if(y>20){
				y=5;
			}
			map.mBackground.setCell(x, y-4, 0);
			if(x == changePointX[0] & y-4 == changePointY[0]){
				bodyMoveSign = changePointSign[0];
				for(int i = 0;i < changePointNum;i++){
					changePointX[i] = changePointX[i+1];
					changePointY[i] = changePointY[i+1];
					changePointSign[i] = changePointSign[i+1];
				}
				changePointNum--;
			}
			
		}
		else if(bodyMoveSign == 1){
			if(img.headSprite.collidesWith(img.foodSprite, true)){
				setfood();
			}
			else{
				x++;
			}
			if(x>16){
				x=1;
			}
			map.mBackground.setCell(x, y-4, 0);
			if(x == changePointX[0] & y-4 == changePointY[0]){
				bodyMoveSign = changePointSign[0];
				for(int i = 0;i < changePointNum;i++){
					changePointX[i] = changePointX[i+1];
					changePointY[i] = changePointY[i+1];
					changePointSign[i] = changePointSign[i+1];
				}
				changePointNum--;
			}
		}
		else if(bodyMoveSign == 2){
			if(img.headSprite.collidesWith(img.foodSprite, true)){
				setfood();
			}
			else{
				y--;
			}
			if(y<5){
				y=20;
			}
			map.mBackground.setCell(x, y-4, 0);
			if(x == changePointX[0] & y-4 == changePointY[0]){
				bodyMoveSign = changePointSign[0];
				for(int i = 0;i < changePointNum;i++){
					changePointX[i] = changePointX[i+1];
					changePointY[i] = changePointY[i+1];
					changePointSign[i] = changePointSign[i+1];
				}
				changePointNum--;
			}
		}
		else if(bodyMoveSign == 3){
			if(img.headSprite.collidesWith(img.foodSprite, true)){
				setfood();
			}
			else{
				x--;
			}
			if(x<1){
				x=16;
			}
			map.mBackground.setCell(x, y-4, 0);
			if(x == changePointX[0] & y-4 == changePointY[0]){
				bodyMoveSign = changePointSign[0];
				for(int i = 0;i < changePointNum;i++){
					changePointX[i] = changePointX[i+1];
					changePointY[i] = changePointY[i+1];
					changePointSign[i] = changePointSign[i+1];
				}
				changePointNum--;
			}
		}
	}
	public void setfood(){
		foodX = r.nextInt(16*8) + 8;
		foodY = r.nextInt(16*8) + 8;
		img.foodSprite.setPosition(foodX, foodY);
	}
	public void gameOver(){
		if(map.mBackground.getCell(headX/8, headY/8) == 1){
			isRun = false;
		}
	}
}