Snake补充可移动代码
Yard添加。。。
import java.awt.Color;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class Yard extends Frame {
public static final int ROWS = 30;
public static final int COLS = 30;
public static final int BLOCK_SIZE = 15;
Snake s = new Snake();
public void launch() {
this.setLocation(300,300);
this.setSize(COLS*BLOCK_SIZE,ROWS*BLOCK_SIZE);
this.setVisible(true);
addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
new Thread(new paintTread()).start(); //线程
}
Image offScreenImage = null;;//双缓冲取消闪烁
public static void main(String[] args) {
new Yard().launch();
}
@Override
public void paint(Graphics g) {
Color c = g.getColor();
g.setColor(Color.GRAY);
g.fillRect(0, 0, COLS*BLOCK_SIZE, ROWS*BLOCK_SIZE);
g.setColor(Color.DARK_GRAY);
for(int i=1;i<ROWS;i++) {
g.drawLine(0, BLOCK_SIZE*i, COLS*BLOCK_SIZE, BLOCK_SIZE*i);
}
for(int i=1;i<COLS;i++) {
g.drawLine(BLOCK_SIZE*i, 0, BLOCK_SIZE*i, ROWS*BLOCK_SIZE);
}
g.setColor(c);
s.draw(g);
}
@Override
public void update(Graphics g) { //update
if(offScreenImage == null) {
offScreenImage = this.createImage(COLS*BLOCK_SIZE,ROWS*BLOCK_SIZE);
}
Graphics gOff = offScreenImage.getGraphics();
paint(gOff);
g.drawImage(offScreenImage, 0, 0, null);
}
private class paintTread implements Runnable { //线程
@Override
public void run() {
while(true) {
repaint();
try {
Thread.sleep(50);
} catch(InterruptedException e) {
e.printStackTrace();
}
}
}
}
private class KeyMonitor extends KeyAdapter {
@Override
public void keyPressed(KeyEvent e) {
s.KeyPressed(e);
}
}
}
Snake添加。。。。
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.KeyEvent;
public class Snake {
private Node head = null;
private Node tail = null;
private int size = 0;
private Node n = new Node(20,5,Dir.L);
public Snake() {
head = n;
tail = n;
size = 1;
}
public void addToTail() {
Node node = null;
switch (tail.dir) {
case L:
node = new Node(tail.row,tail.col+1,tail.dir);
break;
case U:
node = new Node(tail.row+1,tail.col,tail.dir);
break;
case R:
node = new Node(tail.row,tail.col-1,tail.dir);
break;
case D:
node = new Node(tail.row-1,tail.col,tail.dir);
break;
}
tail.next = node;
node.prev = tail;
tail = node;
size ++;
}
public void addToHead() {
Node node = null;
switch(head.dir) {
case L:
node = new Node(head.row,head.col-1,head.dir);
break;
case U:
node = new Node(head.row-1,head.col,head.dir);
break;
case R:
node = new Node(head.row,head.col+1,head.dir);
break;
case D:
node = new Node(head.row+1,head.col,head.dir);
break;
}
node.next = head;
head.prev = node;
head = node;
size++;
}
public void draw(Graphics g) {
if(size <= 0) return ;
move(); ///
for(Node n = head; n != null; n = n.next) {
n.draw(g);
}
}
private void move() { //
addToHead();
deleteFromTail();
}
private void deleteFromTail() { //
if(size == 0) return ;
tail = tail.prev;
tail.next = null;
}
public class Node {
int w = Yard.BLOCK_SIZE;
int h = Yard.BLOCK_SIZE;
int row,col;
Dir dir = Dir.L;
Node next = null;
Node prev = null; //
Node(int row, int col, Dir dir) {
this.row = row;
this.col = col;
this.dir = dir;
}
void draw(Graphics g) {
Color c = g.getColor();
g.setColor(Color.BLACK);
g.fillRect(Yard.BLOCK_SIZE*col, Yard.BLOCK_SIZE*row, w, h);
g.setColor(c);
}
}
public void KeyPressed(KeyEvent e) { //键盘控制
int key = e.getKeyCode();
switch (key) {
case KeyEvent.VK_LEFT:
head.dir = Dir.L;
break;
case KeyEvent.VK_UP:
head.dir = Dir.U;
break;
case KeyEvent.VK_RIGHT:
head.dir = Dir.R;
break;
case KeyEvent.VK_DOWN:
head.dir = Dir.D;
break;
}
}
}
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