[英]Diagonal movement of a sprite
如何实现对精灵的对角移动? 我创建了一个可移动的精灵(一个矩形),它在四个方向上移动。
为了使矩形设置动画,使用了计时器对象和动作执行方法。 我在keyPressed和keyReleased方法中实现了以下代码,以便在四个方向上移动它。
public void keyPressed(KeyEvent arg0){
int c=arg0.getKeyCode();
if(c==KeyEvent.VK_LEFT){
velx=-4;
vely=0;
}
else if(c==KeyEvent.VK_RIGHT){
velx=4;
vely=0;
}
else if(c==KeyEvent.VK_UP){
velx=0;
vely=-4;
}
else if(c==KeyEvent.VK_DOWN){
velx=0;
vely=4;
}
}
public void keyReleased(KeyEvent arg0){
velx=0;
vely=0;
}
以下是基于您上次评论的代码:
// Set of currently pressed keys
private final Set<Integer> pressed = new TreeSet<Integer>();
@Override
public void keyPressed(KeyEvent arg0) {
int c = arg0.getKeyCode();
pressed.add(c);
if (pressed.size() > 1) {
Integer[] array = pressed.toArray(new Integer[] {});
if (array[0] == KeyEvent.VK_LEFT && array[1] == KeyEvent.VK_UP) {
velx = -4;
vely = -4;
} else if (array[0] == KeyEvent.VK_UP && array[1] == KeyEvent.VK_RIGHT) {
velx = 4;
vely = 4;
} else if (array[0] == KeyEvent.VK_RIGHT && array[1] == KeyEvent.VK_DOWN) {
velx = 4;
vely = -4;
} else if (array[0] == KeyEvent.VK_LEFT && array[1] == KeyEvent.VK_DOWN) {
velx = -4;
vely = 4;
}
} else {
if (c == KeyEvent.VK_LEFT) {
velx = -4;
vely = 0;
} else if (c == KeyEvent.VK_RIGHT) {
velx = 4;
vely = 0;
} else if (c == KeyEvent.VK_UP) {
velx = 0;
vely = -4;
} else if (c == KeyEvent.VK_DOWN) {
velx = 0;
vely = 4;
}
}
}
@Override
public void keyReleased(KeyEvent arg0) {
velx = 0;
vely = 0;
pressed.remove(Integer.valueOf(arg0.getKeyCode()));
}
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