python opencv 根据鼠标进行相应操作

最新推荐文章于 2023-12-16 17:08:06 发布

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最新推荐文章于 2023-12-16 17:08:06 发布

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分类专栏： python 文章标签： opencv python

本文链接：https://blog.youkuaiyun.com/TingHW/article/details/84486943

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# 列出所有可用的事件，执行下面的代码：
import cv2
events = [i for i in dir(cv2) if 'EVENT' in i]#dir() 函数不带参数时，返回当前范围内的变量、方法和定义的类型列表；带参数时，返回参数的属性、方法列表。
print(events)

['EVENT_FLAG_ALTKEY', 'EVENT_FLAG_CTRLKEY', 'EVENT_FLAG_LBUTTON', 'EVENT_FLAG_MBUTTON', 'EVENT_FLAG_RBUTTON', 'EVENT_FLAG_SHIFTKEY', 'EVENT_LBUTTONDBLCLK', 'EVENT_LBUTTONDOWN', 'EVENT_LBUTTONUP', 'EVENT_MBUTTONDBLCLK', 'EVENT_MBUTTONDOWN', 'EVENT_MBUTTONUP', 'EVENT_MOUSEHWHEEL', 'EVENT_MOUSEMOVE', 'EVENT_MOUSEWHEEL', 'EVENT_RBUTTONDBLCLK', 'EVENT_RBUTTONDOWN', 'EVENT_RBUTTONUP']


# 双击的时候画一个圆
import cv2
import numpy as np

# mouse callback function
def draw_circle(event, x, y, flags, param):#参数一个不能少
    if event == cv2.EVENT_LBUTTONDBLCLK:#左键双击
        cv2.circle(img, (x, y), 100, (255, 0, 0), -1)

# Create a black image, a window and bind the function to window
img = np.zeros((512,512,3),np.uint8)
cv2.namedWindow('image')
cv2.setMouseCallback('image',draw_circle)
while(1):
    cv2.imshow('image',img)
    if cv2.waitKey(20) & 0xFF == 27:
        break
cv2.destroyAllWindows()

---------------------------------------------------------------------------

KeyboardInterrupt                         Traceback (most recent call last)

<ipython-input-1-447ad1ab3ad4> in <module>()
     15 while(1):
     16     cv2.imshow('image',img)
---> 17     if cv2.waitKey(20) & 0xFF == 27:
     18         break
     19 cv2.destroyAllWindows()


KeyboardInterrupt:


# 通过拖拽鼠标画矩形或者圆（由我们选择的模式决定）

import cv2
import numpy as np
    
drawing = False  # true if mouse is pressed
mode=True# if True, draw rectangle. Press 'm' to toggle to curve
ix, iy = -1, -1

# mouse callback function
def draw_circle(event, x, y, flags, param):
    global ix, iy, drawing, mode

    if event == cv2.EVENT_LBUTTONDOWN:
        drawing = True
        ix,iy = x,y
    elif event == cv2.EVENT_MOUSEMOVE:
        if drawing == True:
            if mode == True:
                cv2.rectangle(img, (ix, iy), (x, y),(0,255,0),-1)
            else:
                cv2.circle(img,(x,y),5,(0,0,255),-1)
    elif event == cv2.EVENT_LBUTTONUP:
        drawing = False
        if mode == True:
            cv2.rectangle(img,(ix,iy),(x,y),(0,255,0),-1)
        else:
            cv2.circle(img,(x,y),5,(0,0,255),-1)

            
img = np.zeros((512, 512, 3),np.uint8)
cv2.namedWindow('image')
cv2.setMouseCallback('image',draw_circle)

while(1):
    cv2.imshow('image',img)
    k = cv2.waitKey(1) & 0xFF
    if k == ord('m'):
        mode = not mode
    elif k == 27:
        break

cv2.destroyAllWindows()