我正在做一个正交平铺地图 Java 游戏,当我的船移动到 x 和 y 边界时,按下方向键它会停止移动(如预期的那样),但是如果我继续按下键,我的角色就会离开屏幕。
这是我正在使用的代码:
@Override
public boolean keyDown(int keycode) {
ship = world.getShip();
switch(keycode){
case Keys.W:
if (ship.getPosition().y<28.5f){
ship.getVelocity().y = 1;}
else {
ship.getVelocity().y = 0;
}
break;
case Keys.S:
if (ship.getPosition().y1){
ship.getVelocity().y = -1;}
else {
ship.getVelocity().y = 0;
}
break;
case Keys.A:
if (ship.getPosition().x0)
ship.getVelocity().x = -1.5f;
else{
ship.getVelocity().x = 0;
}
break;
case Keys.D:
if (ship.getPosition().x<39){
ship.getVelocity().x = 1;
}
else{
ship.getVelocity().x = 0;
}
break;
default:
break;
}
return true;
}
@Override
public boolean keyUp(int keycode) {
ship = world.getShip();
switch(keycode){
case Keys.W:
if(ship.getVelocity().y == 1)
ship.getVelocity().y = 0;
break;
case Keys.S:
if(ship.getVelocity().y == -1)
ship.getVelocity().y = 0;
break;
case Keys.A:
if(ship.getVelocity().x == -1.5f)
ship.getVelocity().x = 0;
break;
case Keys.D:
if(ship.getVelocity().x == 1)
ship.getVelocity().x = 0;
break;
default:
break;
}
return true;
}
如果按键一直被按下,我应该怎么做才能让我的船保持在屏幕上?