[人工智能]2021-08-31 opencv练习题 使用轨迹栏创建颜色和画笔半径可调的Paint应用程序

opencv练习题 使用轨迹栏创建颜色和画笔半径可调的Paint应用程序

import cv2 as cv
import numpy as np
img = np.zeros((512,512,3),np.uint8)
cv.namedWindow('image')
def nothing(x):
    pass
def draw_circle(event,x,y,thick,param):
    global ix,iy,drawing,color,thickness
    if event == cv.EVENT_LBUTTONDOWN:
        drawing = True
        ix,iy = x,y
    elif event == cv.EVENT_MOUSEMOVE:
        if drawing == True:
            cv.circle(img,(x,y),thickness,color,-1,cv.LINE_AA)
    elif event == cv.EVENT_LBUTTONUP:
        drawing = False
        cv.circle(img,(x,y),thickness,color,-1,cv.LINE_AA)
cv.setMouseCallback('image',draw_circle,(0,0,255))        


cv.createTrackbar('Red','image',0,255,nothing)
cv.createTrackbar('Green','image',0,255,nothing)
cv.createTrackbar('Blue','image',0,255,nothing)
cv.createTrackbar('Thickness','image',1,10,nothing)
color = [0,0,0]
drawing = False
thickness = 5



while(1):
    cv.imshow('image',img)
    if cv.waitKey(1) & 0xFF == ord('q'):
        break
    r = cv.getTrackbarPos('Red','image')
    g = cv.getTrackbarPos('Green','image')
    b = cv.getTrackbarPos('Blue','image')
    thickness = cv.getTrackbarPos('Thickness','image')
    color = [b,g,r]

cv.destroyAllWindows()

刚开始学习python还有opencv，代码可以按照要求运行，不过还有修改的地方