opencv学习笔记(六)：使用opencv画线、矩形、椭圆、多边形线、多边形体等

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1、在MFC中我们经常会画线、矩形、椭圆、多边形等几何结构，opencv为我们提供了已经封装好的函数来实现该功能，而且简单方便。下面提供一下例子，是Opencv安装以后自带的小程序，学习完现在的程序你可以学会以下知识：（1）生成随机数，使用RNG类（2）画线（3）画矩形（4）画椭圆（5）画圆（6)输出文字、文本(7)如果不熟悉Opencv的还能学会point结构体的使用，Scalar结构使用。具体可以看下面的小例子。在vs2010下运行一下就会明白了！#include"stdafx.h"#include"opencv2/core/core.hpp"#include"opencv2/highgui/

2、highgui.hpp"#includeusingnamespacecv;voidhelp(){ printf("ThisprogramdemonstratesOpenCVdrawingandtextoutputfunctions."  "Usage:"  " ./drawing");}staticScalarrandomColor(RNG&rng){ inticolor=(unsigned)rng; returnScalar(icolor&255,(icolor>>8)&255,(icolor>>16)&255);}intmain(){ help(); ch

3、arwndname[]="DrawingDemo"; constintNUMBER=100; constintDELAY=5; intlineType=CV_AA;//changeitto8toseenon-antialiasedgraphics inti,width=1000,height=700; intx1=-width/2,x2=width*3/2,y1=-height/2,y2=height*3/2; RNGrng(0xFFFFFFFF); Matimage=Mat::zeros(height,width,CV_8UC3); imshow(wndname,image); waitKe

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5、StateenterprisesMinister,ShenmufuguSARmissions,DirectorofNingxiaCountypartyCommitteeSecretaryandrecorderoftheCountypartyCommitteeSecretary,Ministersand for(i=0;i

6、line(image,pt1,pt2,randomColor(rng),rng.uniform(1,10),lineType);  imshow(wndname,image);  if(waitKey(DELAY)>=0)   return0; } for(i=0;i

7、,10);  rectangle(image,pt1,pt2,randomColor(rng),MAX(thickness,-1),lineType);  imshow(wndname,image);  if(waitKey(DELAY)>=0)   return0; } for(i=0;i