Opencv 任意区域选中

一：响应WM_SetCursor消息，改变鼠标形状

参考资料：http://blog.csdn.net/shuilan0066/article/details/6691438

主要函数：

SetCursor(LoadCursor(NULL,IDC_ARROW)); 

SetCursor(LoadImage(NULL,"res//XiangPi.ico",IMAGE_ICON,20,20,LR_LOADFROMFILE)); 

GetCursorPos(pointPos)：该函数获取的是屏幕坐标

二：实时获取鼠标坐标

参考资料：http://blog.csdn.net/quarryman/article/details/8450387

主要部分：容器使用，增加，删除元素

#include <cv.h>
#include <highgui.h>
#include <stdio.h>
#include <vector>
#include <fstream>
using namespace std;


#define max(a,b)            (((a) > (b)) ? (a) : (b))
#define min(a,b)            (((a) < (b)) ? (a) : (b))


//注意参数是有符号短整型，该函数的作用是使i限定为[a,b]区间内
int bound(short i,short a,short b)
{
return min(max(i,min(a,b)),max(a,b));
}


CvScalar getInverseColor(CvScalar c)
{
CvScalar s;
for(int i=0;i<=2;++i)
{
s.val[i]=255-c.val[i];
}
return s;
}


IplImage* src=0;
IplImage* dst=0;
int n=0;
vector<CvPoint> points;


void on_mouse( int event, int x, int y, int flags, void* ustc)
{
CvPoint pt;
CvPoint tmp_pt = {-1,-1};
CvFont font;
cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX, 0.4, 0.4, 0, 1, CV_AA);
char temp[16];
CvSize text_size;
int baseline;


CvScalar clrPoint=cvScalar(255,0,0,0);
CvScalar clrText=cvScalar(255, 255, 255, 0);


if( event == CV_EVENT_MOUSEMOVE )
{
cvCopy(dst,src);


x=bound(x,0,src->width-1);
y=bound(y,0,src->height-1);
pt = cvPoint(x,y);
cvCircle( src, pt, 2,clrPoint ,CV_FILLED, CV_AA, 0 );


sprintf(temp,"%d (%d,%d)",n+1,x,y);
cvGetTextSize(temp,&font,&text_size,&baseline);
tmp_pt.x = bound(pt.x,0,src->width-text_size.width);
tmp_pt.y = bound(pt.y,text_size.height+baseline,src->height-1-baseline);
cvPutText(src,temp, tmp_pt, &font, clrText);


cvShowImage( "src", src );
} 
else if( event == CV_EVENT_LBUTTONDOWN)
{
pt = cvPoint(x,y);
points.push_back(pt); n++;
cvCircle( src, pt, 2, clrPoint ,CV_FILLED, CV_AA, 0 );


sprintf(temp,"%d (%d,%d)",n,x,y);
cvGetTextSize(temp,&font,&text_size,&baseline);
tmp_pt.x = bound(pt.x,0,src->width-text_size.width);
tmp_pt.y = bound(pt.y,text_size.height+baseline,src->height-1-baseline);
cvPutText(src,temp, tmp_pt, &font, clrText);


cvCopy(src,dst);
cvShowImage( "src", src );
} 
else if( event == CV_EVENT_RBUTTONDOWN )
{
if(!points.empty())
{
cvCopy(dst,src);


pt=points.back();
points.pop_back(); 
cvCircle( src, pt, 2, getInverseColor(clrPoint),CV_FILLED, CV_AA, 0 );


sprintf(temp,"%d (%d,%d)",n,pt.x,pt.y); --n;
cvGetTextSize(temp,&font,&text_size,&baseline);
tmp_pt.x = bound(pt.x,0,src->width-text_size.width);
tmp_pt.y = bound(pt.y,text_size.height+baseline,src->height-1-baseline);
cvPutText(src,temp, tmp_pt, &font, getInverseColor(clrText));


cvCopy(src,dst);
cvShowImage( "src", src );
}
}
}


int main()
{
src=cvLoadImage("lena.jpg",1);
dst=cvCloneImage(src);


cvNamedWindow("src",1);
cvSetMouseCallback( "src", on_mouse, 0 );

cvShowImage("src",src);
cvWaitKey(0); 
cvDestroyAllWindows();
cvReleaseImage(&src);
cvReleaseImage(&dst);


ofstream file("sample.txt");
if(!file)
{
cout << "open file error!";
return 1;
}
vector<CvPoint>::iterator it=points.begin();
for(;it!=points.end();++it)
{
file<< it->x<<','<<it->y<<endl;
}
file<<endl;
file.close();


return 0;
}