box.cpp

opencv codes in C++ (linux and eclipse)

//opencv c++ code to create an image with a rectangle crossing vertical yellow 
//line from bottom corner to top corner

#include "cv.h" 
#include "highgui.h" 

int main()
{
 /* LINE */
 	int key;
	 

 
 	IplImage* img = cvCreateImage(cvSize(500,500), 8, 3);  /*create new image to display line and rectangle*/
 	CvPoint x1 = cvPoint(250,0); /*coordinates of the line */
 	CvPoint y1 = cvPoint (250,495);
 
 	CvScalar color = CV_RGB(255,255,0);  /*line color */
 
 	cvLine(img, x1,y1,color,20,CV_AA,0); /*line, CV_AA means Anti Aliasing*/
  	
 	for (int i = 100; i<=300; i++)
 	{
 		 CvPoint a1 = cvPoint(i,350-i);
 		 CvPoint b1 = cvPoint (i+100,450-i);
 		 cvRectangle( img, a1, b1, CV_RGB(204,255,255), CV_FILLED );
 		 cvNamedWindow("Line",1);
 		 cvShowImage("Line", img);
 		 key = cvWaitKey(3);
 		 cvSaveImage("Resultant-Line.jpg",img);
 		 cvRectangle( img, a1, b1, CV_RGB(0,0,0), CV_FILLED );
 		 cvLine(img, x1,y1,color,20,CV_AA,0); 
 		  
 		
 	} 
 
 	
  
    /* saving the image in a new file named ResultantLine,jpg */
 	cvSaveImage("ResultantLine.jpg",img); 
 	
 
	//wait for key to close the window
 	cvWaitKey(0);
 
 	/* destroy and release image*/
 	cvDestroyWindow( "Line" );
 	cvReleaseImage( &img);
 	return 0;
 
}