import javax.swing.*;
import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.geom.Line2D;
import java.util.*;
/**
* Version:1.5
* 功能：画出10*10个方格
* 0 1 2 3 4 5 6 7 8 9
* 10 11
* ......................
* ....................99
* 在任意位置显示一个方格，并让键盘控制运动方向,连续运动
* 产生随机苹果，可以判断是否吃掉。
* 改动：用可变长数组来存放蛇身。
* 完成基本效果
*/
public class SnakeDemo5 {
private JFrame frame;
private int AppleDisplayFlag = 1; // 苹果是否显示标志位
private int UPFlag = 0;int DownFlag=0;int LeftFlag=0;int RightFlag=0;
private int SnakeHead = 2;
private int AppleIndex = 0;
private int numberOfRow = 20; // 改变每行的box数量
private int numberOfBox = numberOfRow * numberOfRow;
private int[] BoxDisplayFlag = new int[numberOfBox];// 刷新时遍历，根据flag选择是否显示对应的box
private Vector snakeBody = new Vector();
int snakeEndBuf = 0;
public static void main(String[] args) {
SnakeDemo5 snake = new SnakeDemo5();
snake.go();
}
private void go(){
frame = new JFrame();
MyDrawPanel myDrawPanel = new MyDrawPanel();
frame.addKeyListener(myDrawPanel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(myDrawPanel); // 把自己的画板加到frame框架中
frame.setSize(300, 300); // 框架窗口大小
frame.setVisible(true); // 最后把frame显示出来
snakeBody.add(SnakeHead);
snakeBody.add(1);
snakeBody.add(0);
for(int i=0; i<snakeBody.size();i++){ // 初始化，画板2号格子蛇头，snakeBody的0号元素。
BoxDisplayFlag[(int) snakeBody.get(i)] = 1;
}
AppleIndex = (int) (Math.random()*100);
while(true){
if(DownFlag == 1){
snakeEndBuf = (int) snakeBody.get(snakeBody.size()-1);
for(int i=snakeBody.size()-1; i>0; i--){ // 更新蛇身，前一个(显示位置)赋给后一个
snakeBody.set(i, snakeBody.get(i-1));
}
SnakeHead += numberOfRow;
snakeBody.set(0, SnakeHead); // 蛇头单独算
if(AppleIndex == SnakeHead){ // 吃了苹果
AppleIndex = (int) (Math.random()*100);
snakeBody.add(snakeEndBuf); // 把苹果加到蛇身尾部，蛇长+1(原尾部的蛇身已经前一个覆盖掉)
}
for(int i=0; i<BoxDisplayFlag.length; i++){BoxDisplayFlag[i]=0;} // 清零
for(int i=0; i<snakeBody.size(); i++){
BoxDisplayFlag[(int) snakeBody.get(i)]=1;
}
frame.repaint(); // 刷新
}
if(UPFlag == 1){
snakeEndBuf = (int) snakeBody.get(snakeBody.size()-1);
for(int i=snakeBody.size()-1; i>0; i--){
snakeBody.set(i, snakeBody.get(i-1));
}
SnakeHead -= numberOfRow;
snakeBody.set(0, SnakeHead);
if(AppleIndex == SnakeHead){ // 吃了苹果
AppleIndex = (int) (Math.random()*100);
snakeBody.add(snakeEndBuf);
}
for(int i=0; i<BoxDisplayFlag.length; i++){BoxDisplayFlag[i]=0;} // 清零
for(int i=0; i<snakeBody.size(); i++){
BoxDisplayFlag[(int) snakeBody.get(i)]=1;
}
frame.repaint(); // 刷新
}
if(LeftFlag == 1){
snakeEndBuf = (int) snakeBody.get(snakeBody.size()-1);
for(int i=snakeBody.size()-1; i>0; i--){
snakeBody.set(i, snakeBody.get(i-1));
}
SnakeHead -= 1;
snakeBody.set(0, SnakeHead);
if(AppleIndex == SnakeHead){ // 吃了苹果
AppleIndex = (int) (Math.random()*100);
snakeBody.add(snakeEndBuf);
}
for(int i=0; i<BoxDisplayFlag.length; i++){BoxDisplayFlag[i]=0;} // 清零
for(int i=0; i<snakeBody.size(); i++){
BoxDisplayFlag[(int) snakeBody.get(i)]=1;
}
frame.repaint(); // 刷新
}
if(RightFlag == 1){
snakeEndBuf = (int) snakeBody.get(snakeBody.size()-1);
for(int i=snakeBody.size()-1; i>0; i--){
snakeBody.set(i, snakeBody.get(i-1));
}
SnakeHead += 1;
snakeBody.set(0, SnakeHead);
if(AppleIndex == SnakeHead){ // 吃了苹果
AppleIndex = (int) (Math.random()*100);
snakeBody.add(snakeEndBuf);
}
for(int i=0; i<BoxDisplayFlag.length; i++){BoxDisplayFlag[i]=0;} // 清零
for(int i=0; i<snakeBody.size(); i++){
BoxDisplayFlag[(int) snakeBody.get(i)]=1;
}
frame.repaint(); // 刷新
}
try{
Thread.sleep(100); // 控制运行速度
}catch (Exception ex){};
}
}
/* 自己的画板panel */
class MyDrawPanel extends JPanel implements KeyListener {
double width = 0, height = 0;
public void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
double leftX = 0, topY = 0;
for(int i=0; i<numberOfRow; i++){
width = (double) getWidth()/numberOfRow;
height = (double) getHeight()/numberOfRow;
g2.draw(new Line2D.Double(leftX+i*width, topY, leftX+i*width,numberOfRow*height));// 竖
g2.draw(new Line2D.Double(leftX, topY+i*height,numberOfRow*width, topY+i*height));// 行
}
/* numberOfBox个Box，编号0-numberOfBox 查询需要显示的方格*/
for(int i=0; i<numberOfBox; i++){
if(BoxDisplayFlag[i] == 1){
width = (double) getWidth()/numberOfRow;
height = (double) getHeight()/numberOfRow;
topY =(double)(i / (numberOfRow)) * (double) getHeight() / numberOfRow;
leftX =(double)(i % (numberOfRow)) * (double) getWidth() / numberOfRow;
g2.fillRect((int)leftX,(int)topY,(int)width,(int)height);
}
}
if(AppleDisplayFlag == 1){ // 苹果可以显示
double topY_apple=0, leftX_apple=0;
width = (double) getWidth()/numberOfRow;
height = (double) getHeight()/numberOfRow;
topY_apple =(double)(AppleIndex / (numberOfRow)) * (double) getHeight() / numberOfRow;
leftX_apple =(double)(AppleIndex % (numberOfRow)) * (double) getWidth() / numberOfRow;
g2.fillRect((int)leftX_apple,(int)topY_apple,(int)width,(int)height);
System.out.println(AppleIndex);
}
}
@Override
public void keyTyped(KeyEvent e) {
}
@Override
public void keyPressed(KeyEvent e) {
// System.out.println("被按下"+ (char)e.getKeyCode()); // 测试
switch(e.getKeyCode())
{
case KeyEvent.VK_UP:
UPFlag =1;
DownFlag = 0;
LeftFlag = 0;
RightFlag = 0;
break;
case KeyEvent.VK_DOWN:
UPFlag =0;
DownFlag = 1;
LeftFlag = 0;
RightFlag = 0;
break;
case KeyEvent.VK_LEFT:
UPFlag =0;
DownFlag = 0;
LeftFlag = 1;
RightFlag = 0;
break;
case KeyEvent.VK_RIGHT:
UPFlag =0;
DownFlag = 0;
LeftFlag = 0;
RightFlag = 1;
break;
}
}
@Override
public void keyReleased(KeyEvent e) {
}
}
}
