opencv_python学习笔记五

7把鼠标当画笔

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2016/11/14 9:42
# @Author  : Retacn
# @Site    : 处理鼠标事件
# @File    : mouseDraw.py
# @Software: PyCharm

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

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2016/11/14 9:42
# @Author  : Retacn
# @Site    : 处理鼠标事件,双击画圆
# @File    : mouseDraw.py
# @Software: PyCharm

import cv2
import numpy as np

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

#鼠标事件回调函数
def draw_circle(event,x,y,flags,param):
    if event==cv2.EVENT_LBUTTONDBLCLK:
        cv2.circle(img,(x,y),100,(255,0,0),-1)

#创建图像与窗口
#将窗口和回调函数邦定
img=np.zeros((512,512,3),np.uint8)
cv2.namedWindow("Mouse_draw")
cv2.setMouseCallback("Mouse_draw",draw_circle)

while(1):
    cv2.imshow("Mouse_draw",img)
    if cv2.waitKey(20)&0xFF==27:
        break;
cv2.destroyAllWindows()

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2016/11/14 9:55
# @Author  : Retacn
# @Site    : 根据选择在拖动时画矩形或是画圆
# @File    : mouseDraw2.py
# @Software: PyCharm
import cv2
import numpy as np

# 当鼠标按下的为true
drawing = False
# 如果mode为true绘制矩形,按下m 绘制曲线
mode = True
lx, ly = -1, -1


# 回调函数
def draw_circle(event, x, y, flags, param):
    global lx, ly, drawing, mode
    # 当按下左健时返回起始位置坐标
    if event == cv2.EVENT_LBUTTONDOWN:
        drawing = True
        lx, ly = x, y
    # 当左健按下并移动是绘制图形,event(移动),flag(是否按下)
    elif event == cv2.EVENT_MOUSEMOVE and flags == cv2.EVENT_FLAG_LBUTTON:
        if drawing == True:
            if mode == True:
                cv2.rectangle(img, (lx, ly), (x, y), (0, 255, 0), -1)
            else:
                # 绘制圆
                cv2.circle(img, (x, y), 3, (0, 0, 255), -1)
    # 当鼠标放开停止
    elif event == cv2.EVENT_LBUTTONUP:
        drawing = False


img = np.zeros((512, 512, 3), np.uint8)
cv2.namedWindow("Mouse_draw2")
cv2.setMouseCallback('Mouse_draw2', draw_circle)
while (1):
    cv2.imshow('Mouse_draw2', img)
    k = cv2.waitKey(1) & 0xFF
    if k == ord('m'):
        mode = not mode
    elif k == 27:
        break