Where is the upper-left corner?

[xiaoshuguo750]

Hi!
Where is the upper-left corner?

Does four vertex of pos Rectangular have a law,?such as clockwise, counterclockwise, I think these will affect the results of the function!
function:
def bboxes_to_grasps(bboxes):
box = tf.unstack(bboxes, axis=1)
x = (box[0] + (box[4] - box[0])/2) * 0.35
y = (box[1] + (box[5] - box[1])/2) * 0.47
tan = (box[3] -box[1]) / (box[2] -box[0]) *0.47/0.35
h = tf.sqrt(tf.pow((box[2] -box[0])*0.35, 2) + tf.pow((box[3] -box[1])*0.47, 2))
w = tf.sqrt(tf.pow((box[6] -box[0])*0.35, 2) + tf.pow((box[7] -box[1])*0.47, 2))
return x, y, tan, h, w

When the grab rectangle is tilted to the left or to the right, how does the upper left corner of the rectangle behave according to the above calculation formula?
抓取矩形朝左倾斜或朝右倾斜时，如果按照上述计算公式，矩形的左上角是怎么规定的呢？