//从这开始是Debug代码，删掉不影响功能
//绘制四叉树节点的范围
void DrawField()
{
if (DontHaveChildren())
{
Vector3 upperRight = new Vector3(_field.right, _field.top, 0);
Vector3 lowerRight = new Vector3(_field.right, _field.bottom, 0);
Vector3 lowerLeft = new Vector3(_field.left, _field.bottom, 0);
Vector3 upperLeft = new Vector3(_field.left, _field.top, 0);
Debug.DrawLine(upperRight, lowerRight, Color.blue * 0.8f, 0);
Debug.DrawLine(lowerRight, lowerLeft, Color.blue * 0.8f, 0);
Debug.DrawLine(lowerLeft, upperLeft, Color.blue * 0.8f, 0);
Debug.DrawLine(upperLeft, upperRight, Color.blue * 0.8f, 0);
}
else
{
_upperRightChild.DrawField();
_lowerRightChild.DrawField();
_lowerLeftChild.DrawField();
_upperLeftChild.DrawField();
}
}
