[Python知识库]python围绕点旋转

#点p_x, p_y 围绕center_x, center_y顺时针旋转angle度

import cv2
import math
import numpy as np
import os

def get_degree(p1, p0):
    aaa = math.degrees(math.atan2((p1[1] - p0[1]), (p1[0] - p0[0])))
    if aaa < 0:
        aaa = 360 + aaa
    aaa = (aaa + 90)
    if aaa > 360:
        aaa = aaa - 360
    return aaa

def rotate_image(box_points, angle, scale=1.):
    c_x=box_points[0][0]
    c_y=box_points[0][1]
    rot_mat = cv2.getRotationMatrix2D((c_x, c_y), angle, scale)

    rot_move = np.dot(rot_mat, np.array([0, 0, 0]))

    rot_mat[0, 2] += rot_move[0]
    rot_mat[1, 2] += rot_move[1]
    new_box_points = []
    for point in box_points:
        new_points = []
        p_x, p_y = point[2],point[3]
        point1 = np.dot(rot_mat, np.array([p_x, p_y, 1]))
        new_points.append((point1))
        new_box_points.append(new_points)

    return ne

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