//lz-2016.07.18 根据鼠标点的位置，将这个Transfrom显示在屏幕的中合适的位置，不超出屏幕
public static void SetTransInScreenByMousePos(this Transform trans, InScreenOffsetMode offsetMode = InScreenOffsetMode.OffsetBounds)
{
Vector3 mousePos = Input.mousePosition;
mousePos = new Vector3(mousePos.x - Screen.width / 2, mousePos.y - Screen.height / 2, trans.localPosition.z);
Vector2 pos = GetPosInScreenByPos(trans, mousePos, offsetMode);
trans.localPosition = new Vector3(pos.x, pos.y, trans.localPosition.z);
}
//lz-2016.07.18 根据Trans的Bounds和ToPos来计算出合适的位置
public static Vector2 GetPosInScreenByPos(this Transform trans, Vector3 toPos, InScreenOffsetMode offsetMode)
{
Bounds wndBounds = NGUIMath.CalculateRelativeWidgetBounds(trans);
//优先计算右下角方向
float screenWidthHalf = Screen.width / 2;
float screenHeightHalf = Screen.height / 2;
float toPosLimitX = toPos.x + wndBounds.size.x;
float toPosLimitY = toPos.y - wndBounds.size.y;
switch (offsetMode)
{
case InScreenOffsetMode.OffsetBounds:
if (toPosLimitX < -screenWidthHalf)
{
toPos.x += wndBounds.size.x;
}
else if (toPosLimitX > screenWidthHalf)
{
toPos.x -= wndBounds.size.x;
}
if (toPosLimitY < -screenHeightHalf)
{
toPos.y += wndBounds.size.y;
}
else if (toPosLimitY > screenHeightHalf)
{
toPos.y -= wndBounds.size.y;
}
break;
case InScreenOffsetMode.OffsetLimit:
toPos.x = Mathf.Clamp(toPosLimitX, -screenWidthHalf, screenWidthHalf);
toPos.y = Mathf.Clamp(toPosLimitY, -screenHeightHalf, screenHeightHalf);
break;
}
return(toPos);
}