opencv:鼠标事件

2019-11-11 01:24:23

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鼠标事件类型

CV_EVENT_MOUSEMOVE0CV_EVENT_LBUTTONDOWN1CV_EVENT_RBUTTONDOWN2CV_EVENT_MRUTTONDOWN3CV_EVENT_LBUTTONUP4CV_EVENT_RBUTTONUP5CV_EVENT_MBUTTONUP6CV_EVENT_LBUTTONDBLCLK7CV_EVENT_RBUTTONDBLCLK8CV_EVENT_MBUTTONDBLCLK9

鼠标事件标志

CV_EVENT_FLAG_LBUTTON1CV_EVENT_FLAG_RBUTTON2CV_EVENT_FLAG_MBUTTON3CV_EVENT_FLAG_CTRLKEY8CV_EVENT_FLAG_SHIFTKEY16CV_EVENT_FLAG_ALTKEY32

用鼠标画矩形

//鼠标事件注册void cvSetMouseCallback(const char* window_name,CvMouseCallback on_mouse,void* param = NULL);#include "cv.h"#include "highgui.h"//鼠标事件声明void my_mouse_callback(int event,int x,int y,int flags,void* param);//声明矩形CvRect box;//画矩形的标志变量bool drawing_box = false;//在图像上画一个矩形void draw_box(iplImage* img,CvRect rect){ cvRectangle(img,cvPoint(box.x,box.y),cvPoint(box.x+box.width,box.y+box.height),cvScalar(0xff,0x00,0x00));}int main(int argc,char** argv){ box = cvRect(-1,-1,0,0); IplImage* image = cvCreateImage(cvSize(200,200),IPL_DEPTH_8U,3); cvZero(image); IplImage* temp = cvCloneImage(image); cvNamedWindow("Example3_6",0); //注册鼠标事件 cvSetMouseCallback("Example3_6",my_mouse_callback,(void*)image); while (1) { cvCopyImage(image,temp); if (drawing_box) { draw_box(temp,box); } cvShowImage("Example3_6",temp); if (cvWaitKey(15) == 27) { break; } } cvReleaseImage(&image); cvReleaseImage(&temp); cvDestroyAllWindows();}void my_mouse_callback(int event,int x,int y,int flags,void* param){ IplImage* image = (IplImage*)param; switch (event) { case CV_EVENT_MOUSEMOVE: { if (drawing_box) { box.width = x - box.x; box.height = y - box.y; } } break; case CV_EVENT_LBUTTONDOWN: { drawing_box = true; box = cvRect(x,y,0,0); } break; case CV_EVENT_LBUTTONUP: { drawing_box = false; if (box.width < 0) { box.x +=box.width; box.width *= -1; } if (box.height <0) { box.y += box.height; box.height *= -1; } draw_box(image,box); } break; default: break; }}

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