【WiEngine 游戏引擎】基础（3）给游戏增加虚拟摇杆

WiEngine中自带了一个虚拟摇杆的实现--VirtualJoystick类

在Wiengine中给游戏添加虚拟摇杆非常方便，下面是具体实现代码：

public class VirtualButtonLayer extends Layer implements IVirtualJoystickCallback
{
private static final int	CENTER		= -1;
private static final int	NORTH		= 0;
private static final int	NORTH_EAST	= 1;
private static final int	EAST		= 2;
private static final int	SOUTH_EAST	= 3;
private static final int	SOUTH		= 4;
private static final int	SOUTH_WEST	= 5;
private static final int	WEST		= 6;
private static final int	NORTH_WEST	= 7;
// 当前的方向
private int					mDir;
private Label				mLabel;

public VirtualButtonLayer()
{
mDir = CENTER;
// 创建一个虚拟摇杆
Sprite bg = Sprite.make(R.drawable.joystick_bg);
bg.setDither(true);
Sprite rocker = Sprite.make(R.drawable.joystick_rocker);
VirtualJoystick vj = VirtualJoystick.make(bg, rocker);
vj.setAnchor(0, 0);
vj.setEventStyle(VirtualJoystick.VJS_NINE_DIRECTIONS);// 设置为9个方向
vj.setPosition(DP(20), DP(20));
vj.setCallback(this);
addChild(vj);

WYSize s = Director.getInstance().getWindowSize();
// 添加一个Label，参数依次为 String 文字 ，float 字体大小
mLabel = Label.make("当前方向：", 20);
mLabel.setPosition(s.width / 2, s.height / 2);
addChild(mLabel);
}

private float DP(float v)
{
return ResolutionIndependent.resolveDp(v);
}

@Override
public void onVJDirectionChanged(int vjPointer, int newDirection)
{
switch (newDirection)
{
case VirtualJoystick.VJD_CENTER:
mDir = CENTER;
break;
case VirtualJoystick.VJD_NORTH:
mDir = NORTH;
break;
case VirtualJoystick.VJD_NORTH_EAST:
mDir = NORTH_EAST;
break;
case VirtualJoystick.VJD_EAST:
mDir = EAST;
break;
case VirtualJoystick.VJD_SOUTH_EAST:
mDir = SOUTH_EAST;
break;
case VirtualJoystick.VJD_SOUTH:
mDir = SOUTH;
break;
case VirtualJoystick.VJD_SOUTH_WEST:
mDir = SOUTH_WEST;
break;
case VirtualJoystick.VJD_WEST:
mDir = WEST;
break;
case VirtualJoystick.VJD_NORTH_WEST:
mDir = NORTH_WEST;
break;
}
mLabel.setText("当前方向：" + mDir);
}

@Override
public void onVJNavigationEnded(int vjPointer)
{
}

@Override
public void onVJNavigationStarted(int vjPointer)
{
}
}

通过setEventStyle()设置摇杆类型，摇杆的类型有3个：



上面用到的Label也是nodes的子类，可以直接添加到Layer中。

最后是效果图：



转载请注明出处：http://blog.csdn.net/Vestigge