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pythonmathgeometryangle

Coordinates on image to clock time

I have an image and a set of coordinates on that image (x and y) and I need to somehow turn them into a clock time. Here's an image showing what I'm trying to do: example

So point B will become 3 o'clock (it'll be rounded) I have no idea where to start, so any help is appreciated!

Solution 
  • # 坐标夹角转换为时间
# 计算两点间的夹角
import math


def calc_angle(other, center=(320, 240)):
    x = center[0] - other[0]
    y = center[1] - other[1]
    z = math.sqrt(x * x + y * y)
    angle = round(math.asin(y / z) / math.pi * 180)
    return angle + 90


def angle_to_time(angle):
    second = angle * 120   # one angle = 120 seconds
    hour = second // 3600
    second %= 3600
    minute = second // 60
    second %= 60
    return hour, minute, second


print(angle_to_time(calc_angle((330, 240))))

(3, 0, 0)