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# اهداف | ||
* هندل کردن ایونت های موس | ||
* یادگیری تابع `cv.setMouseCallback()` | ||
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# یک نمونه ساده | ||
برنامه ای منویسیم که هنگام دوبار کلیک کردن یک دایره روی عکس بکشد | ||
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اول یک `callback function` برای موس ایجاد میکنیم که هنگامی که ایونت موس ایجاد میشود عمل میکند | ||
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ایونت موس هر چیزی مثل کلیک چپ و کلیک راست و .... میتواند باشد | ||
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یک مختصات `(x,y)` به ازای هر ایونت دریافت میکنیم | ||
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با داشتن این مختصات و تابع میتوانیم هرکاری بکنیم | ||
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یک نمونه ساده کد در مثال زیر آمده | ||
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```python | ||
import cv2 as cv | ||
events = [i for i in dir(cv) if 'EVENT' in i] | ||
print( events )``` | ||
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ساخت `callback function` یک قاعده ثابتی دارد که در همه جا قابل اجراست | ||
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یک نمونه کد : | ||
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```python | ||
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import numpy as np | ||
import cv2 as cv | ||
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# mouse callback function | ||
def draw_circle(event,x,y,flags,param): | ||
if event == cv.EVENT_LBUTTONDBLCLK: | ||
cv.circle(img,(x,y),100,(255,0,0),-1) | ||
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# Create a black image, a window and bind the function to window | ||
img = np.zeros((512,512,3), np.uint8) | ||
cv.namedWindow('image') | ||
cv.setMouseCallback('image',draw_circle) | ||
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while(1): | ||
cv.imshow('image',img) | ||
if cv.waitKey(20) & 0xFF == 27: | ||
break | ||
cv.destroyAllWindows() | ||
``` | ||
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اکنون میرویم سراغ یک کد پیچیده تر | ||
میخواهیم یک مستطیل یا دایره را روی حرکت موس رسم کنیم | ||
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```pyhton | ||
import numpy as np | ||
import cv2 as cv | ||
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 == cv.EVENT_LBUTTONDOWN: | ||
drawing = True | ||
ix,iy = x,y | ||
elif event == cv.EVENT_MOUSEMOVE: | ||
if drawing == True: | ||
if mode == True: | ||
cv.rectangle(img,(ix,iy),(x,y),(0,255,0),-1) | ||
else: | ||
cv.circle(img,(x,y),5,(0,0,255),-1) | ||
elif event == cv.EVENT_LBUTTONUP: | ||
drawing = False | ||
if mode == True: | ||
cv.rectangle(img,(ix,iy),(x,y),(0,255,0),-1) | ||
else: | ||
cv.circle(img,(x,y),5,(0,0,255),-1) | ||
``` | ||
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اکنون باید یک `callback function` و سیستمی برای تغییر حالت بین مستطیل و دایره ایجاد کنیم | ||
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```python | ||
img = np.zeros((512,512,3), np.uint8) | ||
cv.namedWindow('image') | ||
cv.setMouseCallback('image',draw_circle) | ||
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while(1): | ||
cv.imshow('image',img) | ||
k = cv.waitKey(1) & 0xFF | ||
if k == ord('m'): | ||
mode = not mode | ||
elif k == 27: | ||
break | ||
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cv.destroyAllWindows() | ||
``` |
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