void Update()
{
switch (slingShotState)
{
case SlingShotState.Idle:
InitializeBird();
SetSlingShotLineRenderersActive(true); //重新显示皮筋
SetTrajectoryLineRenderersActive(true); //重新显示弹道线
DisPlaySlingshotLineRenderers();
if (Input.GetMouseButtonDown(0))
{
Vector3 location = Camera.main.ScreenToWorldPoint(Input.mousePosition); //将屏幕位置转为坐标位置
if (BirdToThrow.GetComponent <CircleCollider2D>() == Physics2D.OverlapPoint(location)) //鼠标是否点在鸟上
{
slingShotState = SlingShotState.UserPulling;
}
}
break;
case SlingShotState.UserPulling: //小鸟位置跟随鼠标移动
DisPlaySlingshotLineRenderers();
if (Input.GetMouseButton(0))
{
Vector3 location = Camera.main.ScreenToWorldPoint(Input.mousePosition);
location.z = 0;
//皮筋拉伸限度；
if (Vector3.Distance(location, SlingshotMiddleVector) > BirdDistance)
{
Vector3 maxPosition = (location - SlingshotMiddleVector).normalized * BirdDistance + SlingshotMiddleVector;
BirdToThrow.transform.position = maxPosition;
}
else
{
BirdToThrow.transform.position = location;
}
float distance = Vector3.Distance(SlingshotMiddleVector, BirdWaitPosition.position);
DisplayTrajectoryLineRenderer2(distance);
}
else //鼠标弹起
{
SetTrajectoryLineRenderersActive(false);
TimeThrow = Time.time; //设定起始时间
float distance = Vector3.Distance(SlingshotMiddleVector, BirdToThrow.transform.position);
if (distance > 1)
{
SetSlingShotLineRenderersActive(false); //隐藏皮筋
slingShotState = SlingShotState.BirdFlying; //设置小鸟处于发射状态
ThrowBird(distance);
}
else
{
//GoKit回归
BirdToThrow.transform.positionTo(distance / 10, BirdWaitPosition.transform.position)
.setOnCompleteHandler((x) => { //设置一个处理器
x.complete();
x.destroy();
InitializeBird();
}); //拉姆达 表达式
}
}
break;
}
}
/***
* 初始化小鸟位置
* */
void InitializeBird()
{
BirdToThrow.transform.position = BirdWaitPosition.position;
slingShotState = SlingShotState.Idle;
}
