OpenCV ペイントツールとしてのマウス

マウスクリックすると円を書くサンプル

マウスクリックで円

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import cv2 import numpy as np   # mouse callback function def draw_circle(event,x,y,flags,param):     if event == cv2.EVENT_LBUTTONDBLCLK:         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()

マウスで選択した長方形を塗りつぶすサンプル

長方形

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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()

マウスのイベント一覧を見る方法

タイトル

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import cv2 events = [i for i in dir(cv2) if 'EVENT' in i] print( events)

実行結果

タイトル

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>>> 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'] >>>