import java.awt.*;
import java.awt.event.*;
public class TankClient
extends Frame {
public static final int GAME_WIDTH=800;
public static final int GAME_HEIGHT=600;
Tank myTank =new Tank(50,50);
Image offScreenImage
= null;
myTank.draw(g);//理解一下面向对象
}
if(offScreenImage == null) {
offScreenImage = this.createImage(GAME_WIDTH, GAME_WIDTH);
}
Graphics gOffScreen
= offScreenImage.
getGraphics();
Color c
= gOffScreen.
getColor();
gOffScreen.
setColor(Color.
GREEN);
gOffScreen.fillRect(0, 0, GAME_WIDTH, GAME_WIDTH);
gOffScreen.setColor(c);
paint(gOffScreen);
g.drawImage(offScreenImage, 0, 0, null);
}
public void lauchFrame() {
this.setLocation(400, 300);
this.setSize(GAME_WIDTH, GAME_WIDTH);
this.setTitle("TankWar");
}
});
this.setResizable(false);
this.
setBackground(Color.
GREEN);
this.addKeyListener(new KeyMonitor());
setVisible(true);
new Thread(new PaintThread
()).
start();
}
public static void main
(String[] args
) {
TankClient tc = new TankClient();
tc.lauchFrame();
}
private class PaintThread
implements Runnable {
public void run() {
while(true) {
repaint();
try {
e.printStackTrace();
}
}
}
}
{
myTank.keyPressed(e);
}
}
}
import java.awt.*;
import java.awt.event.*;
public class Tank {
public static final int XSPEED =5;
public static final int YSPEED =5;
private int x,y;
private boolean bL=false,bU=false,bR=false,bD=false;
enum Direction{L,LU,U,RU,R,RD,D,LD,STOP};
private Direction dir=Direction.STOP;
public Tank(int x, int y) {
this.x = x;
this.y = y;
}
{
g.fillOval(x, y, 30, 30);
g.setColor(c);
move();
}
void move()
{
switch(dir) {
case L:
x -= XSPEED;
break;
case LU:
x -= XSPEED;
y -= YSPEED;
break;
case U:
y -= YSPEED;
break;
case RU:
x += XSPEED;
y -= YSPEED;
break;
case R:
x += XSPEED;
break;
case RD:
x += XSPEED;
y += YSPEED;
break;
case D:
y += YSPEED;
break;
case LD:
x -= XSPEED;
y += YSPEED;
break;
case STOP:
break;
}
}
{
int key=e.getKeyCode();
// if(key==KeyEvent.VK_RIGHT)
// {
// x +=5;
// }
switch(key)
{
bL=true;
break;
bU=true;
break;
bR=true;
break;
bD=true;
break;
}
locateDirection() ;
}
void locateDirection()
{
if(bL && !bU && !bR && !bD) dir = Direction.L;
else if(bL && bU && !bR && !bD) dir = Direction.LU;
else if(!bL && bU && !bR && !bD) dir = Direction.U;
else if(!bL && bU && bR && !bD) dir = Direction.RU;
else if(!bL && !bU && bR && !bD) dir = Direction.R;
else if(!bL && !bU && bR && bD) dir = Direction.RD;
else if(!bL && !bU && !bR && bD) dir = Direction.D;
else if(bL && !bU && !bR && bD) dir = Direction.LD;
else if(!bL && !bU && !bR && !bD) dir = Direction.STOP;
}
}