为什么椭圆不能正确响应用户输入？我希望 asdw 控制 Player1 和箭头键来控制 Player2。
课堂机器人
//imports
...
public class Robot extends JComponent{
public Color color = null;
public int direction = 360;
public int xPos = 100;
public int yPos = 100;
public int xVel = 10;
public int yVel = 10;
Robot(){
}
public int getXpos(){
return xPos;
}
public void setXpos(int x){
this.xPos = x;
}
public int getYpos(){
return yPos;
}
public void setYpos(int y){
this.yPos = y;
}
// Same thing for getXvel, setXvel, getYvel, and setYvel
public void move(){
switch(this.direction){
case 0:
this.yPos -= this.yVel;
break;
case 90:
this.xPos+= this.xVel;
break;
case 180:
this.yPos += this.xVel;
break;
case 270:
this.xPos -= this.xVel;
break;
default:
System.out.println("hi");
break;
}
}
}
类 Player1 和 Player2
public class Player1 extends Robot{
Player1(){
xPos = 300;
yPos = 300;
xVel = 10;
yVel = 10;
direction = 0;
Color = Color.WHITE;
}
public void paintComponent(Graphics g){
Graphics2D g2 = (Graphics2D)g;
Ellipse2D.Double ball = new Ellipse2D.Double(xPos, yPos, 100, 100);
g2.setPaint(Color);
g2.draw(ball);
g2.fill(ball);
}
}
// Class Player2 is the same exact copy. The xPos = 500; yPos = 500; xVel = 10; yVel = 10;
类 KeyController
public class KeyController implements KeyListener{
Player1 player1 = new Player1();
Player2 player2 = new Player2();
KeyController(){
}
public void keyPressed(KeyEvent e) {
// Player 1 Left
if(e.getKeyCode() == KeyEvent.VK_A){
player1.setDirection(270);
}
// Player 1 Down
if(e.getKeyCode() == KeyEvent.VK_S){
player1.setDirection(180);
}
...
if(e.getKeyCode() == KeyEvent.VK_LEFT){
player2.setDirection(270);
}
...
}
public void keyReleased(KeyEvent e) {
}
public void keyTyped(KeyEvent e) {
}
}
主要课程：太空游戏
public class SpaceGame extends JFrame implements Runnable{
Player1 player1 = new Player1();
Player2 player2 = new Player2();
KeyController key = new KeyController();
Thread animator;
int delay = 1000;
int frame = 0;
public static final int DEFAULT_WIDTH = 1280;
public static final int DEFAULT_HEIGHT = 740;
SpaceGame(){
// Making the frame
animator = new Thread(this);
animator.start();
setTitle("Game");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
setBackground(Color.GREEN);
addKeyListener(key);
add(player1);
add(player2);
}
public void run(){
while (animator != null)
{
repaint();
player1.move();
player1.setDirection(360); // 360 does nothing
player2.move();
player2.setDirection(360); // 360 does nothing
try
{
Thread.sleep(delay);
}
catch (InterruptedException e)
{
break;
}
frame++;
System.out.println(frame);
}
}
public void paint(Graphics g){
Graphics2D g2 = (Graphics2D)g;
super.paintComponents(g);
player1.paintComponent(g2);
player2.paintComponent(g2);
}
public static void main(String[] args) {
SpaceGame game = new SpaceGame();
game.setVisible(true);
}
}