rotate 4 points(x,y) of a polygon with respect to a center coordinate

label_box_coordinate_rotation.ipynb

from shapely.geometry import Point, LineString
import numpy as np
from PIL import Image
from shapely import affinity
import matplotlib.pyplot as plt
# from shapely.figures import SIZE, set_limits, plot_coords, plot_bounds, plot_line_issimple

import math


def rotate_box(angle, canvas_cord, landmark_cord):

    W, H = canvas_cord

    a = Point(landmark_cord)

    canvas_center_cord = Point(W/2, H/2)

    upper_left_cord = Point(0,0)
    lower_left_cord = Point(0, H)

    ve = 2
    if angle > 90:
        ve = 2 + angle // 90
        angle = angle % 90

    p = math.pow(-1, ve)
    angle = angle*p

    new_upper_left_cord = affinity.rotate(upper_left_cord, angle, origin=canvas_center_cord)
    new_lower_left_cord = affinity.rotate(lower_left_cord, angle, origin=canvas_center_cord)

    shift_x = new_lower_left_cord.x
    shift_y = new_upper_left_cord.y




    current_center_cord = Point(canvas_center_cord.x - (shift_x),
                                canvas_center_cord.y - (shift_y) )

    return current_center_cord

for i in range(0,365,5):
    c = rotate_box(i, (200, 100), (50, 50))
    print('{}\t{}\t{}\n'.format(i, c.x,c.y))