import cv2
cameracapture = cv2.videocapture(0)
# ------------------------獲取滑鼠指令------------------------
clicked = false
def onmouse(event, x, y, flags, param):
global clicked
if event == cv2.event_lbuttonup: # 滑鼠左鍵鬆開
clicked = true
cv2.namedwindow("mywindow", cv2.window_autosize) # 可以省略
cv2.setmousecallback("mywindow", onmouse)
# cv2.setmousecallback()是等待獲取滑鼠輸入
# cv2.waitkey()是等待獲取鍵盤輸入，單位毫秒，返回值為：-1(沒有鍵盤按下)，ascii碼(鍵盤按下)
print("showing camera feed. click window or press any key to stop")
success, frame = cameracapture.read()
frame = cv2.flip(frame, 1) # 左右映象，上下映象(1和-1)
while success and cv2.waitkey(1) == -1 and not clicked: # 可以讀幀，延遲1ms若鍵盤無指令則繼續下一幀操作，滑鼠無指令
cv2.imshow("mywindow", frame)
success, frame = cameracapture.read()
frame = cv2.flip(frame, 1)
cv2.destroyallwindows()
cameracapture.release()
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