OpenCV学习08

//
//  main.cpp
//  Study08
//
//  Created by Sean on 16/2/23.
//  Copyright © 2016年 Sean. All rights reserved.
//

#include <iostream>
#include "highgui.h"

using namespace std;

int main(int argc, const char * argv[]) {
// insert code here...
cout << "Project Start..."<<endl;
//    int num(1) <-> int num = 1;
IplImage* in = cvLoadImage("/Users/sean/Pictures/11.png");
cvNamedWindow("Example08");
CvSize size = cvGetSize(in);
cvRectangle
(
in,
/*size.width是int型的，0.25是double型的，
(size.width*0.25)是double型，(int)(size.width*0.25)是int型，
但由于函数cvPoint( int x, int y )，即使输入double型的x、y也会强行被转换成int型
*/
cvPoint
(
(int)(size.width*0.25),
(int)(size.height*0.25)
),
cvPoint
(
(int)(size.width*0.75),
(int)(size.height*0.75)
),
CvScalar(255,255,255)
);
cvRectangleR(in, cvRect(size.width/2, size.height/2, 100, 100), CvScalar(0,0,0));
cvShowImage("Example08", in);
cvWaitKey(0);
cvReleaseImage(&in);
cvDestroyAllWindows();
return 0;
}