摇杆
DFJoyStick是完全用Flutter实现的Widget，默认是8方向的，可以设置背景图片和一些基本样式。
/// 摇杆
Positioned(
bottom: MediaQuery.of(context).padding.bottom + 30,
left: 30,
child: DFJoyStick(
//backgroundImage: "assets/images/ui/joystick.png",
//handleImage: "assets/images/ui/joystick_btn.png",
onChange: (double radians, String direction) {
_playerSprite?.play(action: DFAnimation.RUN, direction: direction, radians: radians);
},
onCancel: (direction) {
_playerSprite?.play(action: DFAnimation.IDLE, direction: direction);
},
),
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