python鼠标点击事件

一、画矩形框

import cv2global img
global point1, point2
def on_mouse(event, x, y, flags, param):global img, point1, point2img2 = img.copy()if event == cv2.EVENT_LBUTTONDOWN:         #左键点击point1 = (x,y)cv2.circle(img2, point1, 10, (0,255,0), 5)cv2.imshow('image', img2)elif event == cv2.EVENT_MOUSEMOVE and (flags & cv2.EVENT_FLAG_LBUTTON):               #按住左键拖曳cv2.rectangle(img2, point1, (x,y), (255,0,0), 5)cv2.imshow('image', img2)elif event == cv2.EVENT_LBUTTONUP:         #左键释放point2 = (x,y)cv2.rectangle(img2, point1, point2, (0,0,255), 5) cv2.imshow('image', img2)min_x = min(point1[0],point2[0])     min_y = min(point1[1],point2[1])width = abs(point1[0] - point2[0])height = abs(point1[1] -point2[1])cut_img = img[min_y:min_y+height, min_x:min_x+width]cv2.imwrite('lena3.jpg', cut_img)def main():global imgimg = cv2.imread('lena.jpg')cv2.namedWindow('image')cv2.setMouseCallback('image', on_mouse)cv2.imshow('image', img)cv2.waitKey(0)if __name__ == '__main__':main()

二、画线

import osimport cv2
import mathglobal img
global point1, point2def calculate_distance(pt1, pt2):x1, y1 = pt1x2, y2 = pt2dist = math.sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2)return distdef on_mouse(event, x, y, flags, param):global img, point1, point2img2 = img.copy()if event == cv2.EVENT_LBUTTONDOWN:  # 左键点击point1 = (x, y)cv2.circle(img2, point1, 10, (0, 255, 0), 2)cv2.imshow('image', img2)elif event == cv2.EVENT_MOUSEMOVE and (flags & cv2.EVENT_FLAG_LBUTTON):  # 按住左键拖曳cv2.line(img2, point1, (x, y), (255, 0, 0), 2)cv2.imshow('image', img2)elif event == cv2.EVENT_LBUTTONUP:  # 左键释放point2 = (x, y)cv2.line(img2, point1, point2, (0, 0, 255), 2)cv2.imshow('image', img2)distance = calculate_distance(point1, point2)font = cv2.FONT_HERSHEY_SIMPLEXcv2.putText(img2, f'{int(distance)}', (point2[0]+2, point2[1]+2), font, 1.2, (255, 255, 255), 2)cv2.imshow('image', img2)img = img2def main():global img, base_nameimg_path = r"D:\work\data\ellipse_fitting\ori_resize\label_viz0.png"img_name = os.path.split(img_path)[-1]base_name = os.path.splitext(img_name)[0]save_name = base_name + '_gt.jpg'save_dir = r'D:\work\data\ellipse_fitting\gt_axis'os.makedirs(save_dir, exist_ok=True)img = cv2.imread(img_path)cv2.namedWindow('image')cv2.setMouseCallback('image', on_mouse)cv2.imshow('image', img)if cv2.waitKey(0) & 0xFF == ord('s'):cv2.imwrite(os.path.join(save_dir, save_name), img)print('save img:{}'.format(os.path.join(save_dir, save_name)))if __name__ == '__main__':main()

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python鼠标点击事件

一、画矩形框

二、画线

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