【OpenCV】OpenCV的图像绘制功能

qqq.cpp : Defines the entry point for the console application.

#include "stdafx.h"

//功能：展示OpenCV的图像绘制功能
#include "cv.h"
#include "highgui.h"
#include <stdlib.h>
#include <stdio.h>
#define NUMBER 100
#define DELAY 5
char wndname[] = "Drawing Demo";
CvScalar random_color(CvRNG* rng) //函数 cvRNG 初始化随机数生成器并返回其状态，RNG 随机数生成器
{
int icolor = cvRandInt(rng); //函数 cvRandInt 返回均匀分布的随机 32-bit 无符号整型值并更新 RNG 状态
return CV_RGB(icolor&255, (icolor>>8)&255, (icolor>>16)&255); //创建 一个色彩值
}
int main( int argc, char** argv )
{
int line_type = CV_AA; // change it to 8 to see non-antialiased graphics
int i;
CvPoint pt1,pt2; //基于二维整形坐标轴的点
double angle;
CvSize sz;
int width = 1000;
int height = 700;
int width3 = width*3;
int height3 = height*3;
CvSize text_size;
int ymin = 0;
//Load the source image
IplImage* image = cvCreateImage( cvSize(width,height), 8, 3 );
IplImage* image2;
cvNamedWindow(wndname, 1 );
cvZero( image ); //#define cvZero cvSetZero   void cvSetZero( CvArr* arr ); arr 要被清空数组
cvShowImage(wndname,image);
CvRNG rng;
rng = cvRNG((unsigned)-1);
CvPoint ptt[6];
CvPoint* pt[2];
pt[0] = &(ptt[0]);
pt[1] = &(ptt[3]);
int arr[2];
arr[0] = 3;
arr[1] = 3;

for (i = 0; i< NUMBER; i++)
{
pt1.x=cvRandInt(&rng) % width3 - width;
pt1.y=cvRandInt(&rng) % height3 - height;
pt2.x=cvRandInt(&rng) % width3 - width;
pt2.y=cvRandInt(&rng) % height3 - height;
cvLine( image, pt1, pt2, random_color(&rng), cvRandInt(&rng)%10, line_type, 0 );//绘制连接两个点的线段
cvShowImage(wndname,image);
cvWaitKey(DELAY);
}
CvFont font;

for (i = 0; i< NUMBER; i++)
{
pt1.x=cvRandInt(&rng) % width3 - width;
pt1.y=cvRandInt(&rng) % height3 - height;
pt2.x=cvRandInt(&rng) % width3 - width;
pt2.y=cvRandInt(&rng) % height3 - height;
cvRectangle( image,pt1, pt2, random_color(&rng), cvRandInt(&rng)%10-1, line_type, 0 );//绘制简单、指定粗细或者带填充的 矩形
cvShowImage(wndname,image);
cvWaitKey(DELAY);
}
for (i = 0; i< NUMBER; i++)
{
pt1.x=cvRandInt(&rng) % width3 - width;
pt1.y=cvRandInt(&rng) % height3 - height;
sz.width =cvRandInt(&rng)%200;
sz.height=cvRandInt(&rng)%200;
angle = (cvRandInt(&rng)%1000)*0.180;
cvEllipse( image, pt1, sz, angle, angle - 100, angle + 200,random_color(&rng), cvRandInt(&rng)%10-1, line_type, 0 );//函数cvEllipse用来绘制或者填充一个简单的椭圆弧或椭圆扇形
cvShowImage(wndname,image);
cvWaitKey(DELAY);
}
for (i = 0; i< NUMBER; i++)
{
pt[0][0].x=cvRandInt(&rng) % width3 - width;
pt[0][0].y=cvRandInt(&rng) % height3 - height;
pt[0][1].x=cvRandInt(&rng) % width3 - width;
pt[0][1].y=cvRandInt(&rng) % height3 - height;
pt[0][2].x=cvRandInt(&rng) % width3 - width;
pt[0][2].y=cvRandInt(&rng) % height3 - height;
pt[1][0].x=cvRandInt(&rng) % width3 - width;
pt[1][0].y=cvRandInt(&rng) % height3 - height;
pt[1][1].x=cvRandInt(&rng) % width3 - width;
pt[1][1].y=cvRandInt(&rng) % height3 - height;
pt[1][2].x=cvRandInt(&rng) % width3 - width;
pt[1][2].y=cvRandInt(&rng) % height3 - height;
cvPolyLine( image, pt, arr, 2, 1, random_color(&rng), cvRandInt(&rng)%10, line_type, 0 );//函数cvPolyLine 绘制一个简单的或多样的多角曲线
cvShowImage(wndname,image);
cvWaitKey(DELAY);
}
for (i = 0; i< NUMBER; i++)
{
pt[0][0].x=cvRandInt(&rng) % width3 - width;
pt[0][0].y=cvRandInt(&rng) % height3 - height;
pt[0][1].x=cvRandInt(&rng) % width3 - width;
pt[0][1].y=cvRandInt(&rng) % height3 - height;
pt[0][2].x=cvRandInt(&rng) % width3 - width;
pt[0][2].y=cvRandInt(&rng) % height3 - height;
pt[1][0].x=cvRandInt(&rng) % width3 - width;
pt[1][0].y=cvRandInt(&rng) % height3 - height;
pt[1][1].x=cvRandInt(&rng) % width3 - width;
pt[1][1].y=cvRandInt(&rng) % height3 - height;
pt[1][2].x=cvRandInt(&rng) % width3 - width;
pt[1][2].y=cvRandInt(&rng) % height3 - height;
cvFillPoly( image, pt, arr, 2, random_color(&rng), line_type, 0 );//函数cvFillPoly用于一个单独被多变形轮廓所限定的区域内进行填充
cvShowImage(wndname,image);
cvWaitKey(DELAY);
}
for (i = 0; i< NUMBER; i++)
{
pt1.x=cvRandInt(&rng) % width3 - width;
pt1.y=cvRandInt(&rng) % height3 - height;
cvCircle( image, pt1, cvRandInt(&rng)%300, random_color(&rng),
cvRandInt(&rng)%10-1, line_type, 0 );//函数cvCircle绘制或填充一个给定圆心和半径的圆
cvShowImage(wndname,image);
cvWaitKey(DELAY);
}
for (i = 1; i< NUMBER; i++)
{
pt1.x=cvRandInt(&rng) % width3 - width;
pt1.y=cvRandInt(&rng) % height3 - height;
cvInitFont( &font, cvRandInt(&rng) % 8,
(cvRandInt(&rng)%100)*0.05+0.1,
(cvRandInt(&rng)%100)*0.05+0.1,
(cvRandInt(&rng)%5)*0.1, cvRound(cvRandInt(&rng)%10),line_type );//字体结构初始化。函数 cvRound, cvFloor, cvCeil 用一种舍入方法将输入浮点数转换成整数。 cvRound 返回和参数最接近的整数值
cvPutText( image, "Northeast Petroleum University!", pt1, &font, random_color(&rng));//在图像中加入文本
cvShowImage(wndname,image);
cvWaitKey(DELAY);
}
cvInitFont( &font, CV_FONT_HERSHEY_COMPLEX, 3, 3, 0.0, 5, line_type );
cvGetTextSize( "Opencv forever!", &font, &text_size, &ymin );//设置字符串文本的宽度和高度
pt1.x = (width - text_size.width)/2;
pt1.y = (height + text_size.height)/2;
image2 = cvCloneImage(image);
for( i = 0; i < 255; i++ )
{
cvSubS( image2, cvScalarAll(i), image, 0 );//函数 cvSubS 从原数组的每个元素中减去一个数量
cvPutText( image, "shentuhongfeng    forever!", pt1, &font, CV_RGB(255,i,i));
cvShowImage(wndname,image);
cvWaitKey(DELAY);
}
//Wait for a key stroke; the same function arranges events processing
cvWaitKey(0);
cvReleaseImage(&image);
cvReleaseImage(&image2);
cvDestroyWindow(wndname);
return 0;
}