python-3.x - 我们如何在python中以圆周运动旋转图像

Question

我们如何以圆周运动旋转图像，例如在python中向任意方向自由旋转。可能吗？如果是，那我该怎么办？谢谢!

我尝试过，我使用opencv库在单击鼠标时将图像旋转1度。
但这还没有解决。它旋转缓慢，每旋转1度需要点击一下。

这是该代码

 import cv2 as cv
 #import numpy as np

 DEF_ANGLE = 0

 def click_to_rotate(event,x,y,flags,param):
 global DEF_ANGLE,DEF_ANGLE1
 if event == cv.EVENT_FLAG_LBUTTON:
    DEF_ANGLE += 1


 elif event == cv.EVENT_FLAG_RBUTTON:
    DEF_ANGLE -= 1


 cv.namedWindow('window')
 img = cv.imread('4.2.04.tiff')    #put any image here with path
 cv.setMouseCallback('window',click_to_rotate)



 while(True):
 num_rows, num_cols = img.shape[:2]
 rotation_matrix = 
 cv.getRotationMatrix2D((num_cols/2,num_rows/2),DEF_ANGLE,1) 
 img_rotation = cv.warpAffine(img, rotation_matrix, (num_cols, num_rows))
 cv.imshow('window',img_rotation)
 k = cv.waitKey(1) & 0xFF
 if k == 27:
     break

 cv.destroyAllWindows()

Answer 1

我有一个您期望的工作演示:

import cv2 as cv

DEF_ANGLE = 0
pressed_left = False
pressed_right = False

def click_to_rotate(event, x, y, flags, param):
    global DEF_ANGLE, DEF_ANGLE1, pressed_left, pressed_right

    if event == cv.EVENT_LBUTTONDOWN:
        pressed_left = True
        DEF_ANGLE += 1

    elif event == cv.EVENT_MOUSEMOVE:
        #print('x,y',x,y)
        if(pressed_left):
            DEF_ANGLE += 1 

    if event == cv.EVENT_RBUTTONDOWN:
        pressed_right = True
        DEF_ANGLE -= 1

    elif event == cv.EVENT_MOUSEMOVE:
        #print('x,y',x,y)
        if(pressed_right):
            DEF_ANGLE -= 1 

    elif event == cv.EVENT_LBUTTONUP:
        pressed_left = False

    elif event == cv.EVENT_RBUTTONUP:
        pressed_right = False

cv.namedWindow('window')
path = 'C:/Users/selwyn77/Desktop/'
img = cv.imread(path + 'ch.jpg')
img = cv2.resize(img, (0, 0), fx = 0.1, fy = 0.1) 
cv.setMouseCallback('window', click_to_rotate)

while(True):
    num_rows, num_cols = img.shape[:2]
    rotation_matrix = cv.getRotationMatrix2D((num_cols/2, num_rows/2), DEF_ANGLE, 1)
    img_rotation = cv.warpAffine(img, rotation_matrix, (num_cols, num_rows))
    cv.imshow('window', img_rotation)
    k = cv.waitKey(1) & 0xFF
    if k == 27:
        break

cv.destroyAllWindows()

我分别使用两个全局变量进行左右旋转。