【OpenCV】功能:展示OpenCV的图像绘制功能

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//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 5char 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 graphicsint i;CvPoint pt1,pt2; //基于二维整形坐标轴的点double angle;CvSize sz;   //矩形框大小,以像素为精度CvPoint ptt[6];CvPoint* pt[2];int arr[2];CvFont font;CvRNG rng;int width = 1000, height = 700;int width3 = width*3, height3 = height*3;CvSize text_size;int ymin = 0;Load the source imageIplImage* 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);rng = cvRNG((unsigned)-1);pt[0] = &(ptt[0]);pt[1] = &(ptt[3]);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);}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 processingcvWaitKey(0);cvReleaseImage(&image);cvReleaseImage(&image2);cvDestroyWindow(wndname);return 0;}

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