python opencv实现简易画图板_Python

python opencv实现简易画图板

2020-08-28 00:02AnimateX Python

这篇文章主要为大家详细介绍了python opencv实现简易画图板，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

python-opencv实现简易画图板，供大家参考，具体内容如下

									# -*- coding: utf-8 -*-

									"""

									Created on Sat May 19 17:34:54 2018

									@author: xxx

									"""

									import cv2 as cv

									import numpy as np

									def nothing(x):

									  pass

									# 当鼠标按下时变为 True

									drawing = False

									# 如果 mode 为 True 绘制矩形。按下 'm' 变成绘制曲线

									mode = True

									ix, iy = -1, -1

									#创建回调函数

									def draw_circle(event, x, y, flags, param):

									  r = cv.getTrackbarPos('R', 'image')

									  g = cv.getTrackbarPos('G', 'image')

									  b = cv.getTrackbarPos('B', 'image')

									  color = (b, g, r)

									  global ix, iy, drawing, mode

									  # 当按下左键是返回起始位置坐标

									  if event == cv.EVENT_LBUTTONDOWN:

									    drawing = True

									    ix, iy = x, y

									#    当鼠标左键按下并移动是绘制图形。event 可以查看移动, flag 查看是否按下

									  elif event == cv.EVENT_MOUSEMOVE and flags == cv.EVENT_FLAG_LBUTTON:

									    if drawing == True:

									      if mode == True:

									        cv.rectangle(img, (ix, iy), (x, y), color, -1)

									      else:

									        # 绘制圆圈，小圆点连在一起就成了线，3代表画笔的粗细

									        cv.circle(img, (ix, iy), 3, color, -1)

									        # 下面注释的代码是起始点为圆心，起点到终点为半径

									#        r = int(np.sqrt((x - ix)**2 + (y - iy)**2))

									#        cv.circle(img, (x, y), r, (0, 0, 255), -1)

									#    当鼠标松开停止绘画

									  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)

									#创建一幅黑色图形

									img = np.zeros((512, 512, 3), np.uint8)

									cv.namedWindow('image')

									cv.createTrackbar('R', 'image', 0, 255, nothing)

									cv.createTrackbar('G', 'image', 0, 255, nothing)

									cv.createTrackbar('B', 'image', 0, 255, nothing)

									cv.setMouseCallback('image', draw_circle)

									while(1):

									  cv.imshow('image', img)

									  k = cv.waitKey(1)&0xFF

									  if k == ord('m'):

									    mode = not mode

									  elif k==27:

									    break

									cv.destroyAllWindow()