opencv2.4.4
今天用cvFilllPoly()进行图像的绘制，其中遇到一些参数的问题，个人理解如下：
CVAPI(void) cvFillPoly( CvArr* img, CvPoint** pts, const int* npts,
int contours, CvScalar color,
int line_type CV_DEFAULT(8), int shift CV_DEFAULT(0) );
img：图像
pst：折线的顶点指针数组，即：每个图像数组首个坐标的地址
npts：多边形顶点个数数组，2-2个图像，4-第一个图像有4个顶点，3-第二个图像有3个顶点
contours：折线的线段数量，如第三个参数说明所示，我想画两个多边形，那这个参数就是2，如果想画4个多边形，这个参数就是4
color：多边形中的填充色
line_type ：组成多边形线段类型
shift：顶点坐标的小数点位数
个人觉得cvFillPoly的难点主要在于双指针和数组处，写了一个程序
方法三：
//画多边形
#include "cv.h"
#include "highgui.h"
#include "cxcore.h"
#include "stdio.h"
int main(void)
{
IplImage* image;
CvSize imagesize = cvSize(640,640);
CvPoint spoint1[3] = {{100,150},{430,240},{352,466}};
CvPoint spoint2[4] = {{440,300},{560,450},{318,600},{100,419}};
CvPoint* pts1[1] = {&spoint1[0]};
CvPoint* pts2[1] = {&spoint2[0]};
int npts1[1] = {3};
int npts2[1] = {4};
image = cvCreateImage(imagesize, IPL_DEPTH_8U, 3);
cvFillPoly(image, pts1, npts1, 1, CV_RGB(255,0,0),8,0);
cvFillPoly(image, pts2, npts2, 1, CV_RGB(0,0,255),8,0);
cvShowImage("image", image);
cvWaitKey(0);
}
方法二：
//画多边形
#include "cv.h"
#include "highgui.h"
#include "cxcore.h"
#include "stdio.h"
int main(void)
{
IplImage* image;
CvSize imagesize = cvSize(640,640);
CvPoint spoint1[3] = {{100,150},{430,240},{352,466}};
CvPoint spoint2[4] = {{440,300},{560,450},{318,600},{100,419}};
CvPoint* pts1[2] = {&spoint1[0],&spoint2[0]};
int npts1[2] = {3,4};
image = cvCreateImage(imagesize, IPL_DEPTH_8U, 3);
cvFillPoly(image, pts1, npts1, 2, CV_RGB(255,0,0),8,0);
cvShowImage("image", image);
cvWaitKey(0);
}
方法三：
//画多边形
/*#include "cv.h"
#include "highgui.h"
#include "cxcore.h"
#include "stdio.h"
int main(void)
{
IplImage* image;
CvSize imagesize = cvSize(640,640);
CvPoint spoint1[3] = {{100,150},{430,240},{352,466}};
CvPoint spoint2[4] = {{440,300},{560,450},{318,600},{100,419}};
CvPoint* pts1[1] = {&spoint1[0]};
CvPoint* pts2[1] = {&spoint2[0]};
int npts1[1] = {3};
int npts2[1] = {4};
image = cvCreateImage(imagesize, IPL_DEPTH_8U, 3);
cvFillPoly(image, pts1, npts1, 1, CV_RGB(255,0,0),8,0);
cvFillPoly(image, pts2, npts2, 1, CV_RGB(0,0,255),8,0);
cvShowImage("image", image);
cvWaitKey(0);
}*/
//画多边形
#include "cv.h"
#include "highgui.h"
#include "cxcore.h"
#include "stdio.h"
int main(void)
{
IplImage* image;
CvSize imagesize = cvSize(640,640);
CvPoint spoint1[7];
CvPoint* pts1[2] = {&spoint1[0],&spoint1[3]};
int npts1[2] = {3,4};
spoint1[0] = cvPoint(100,150);
spoint1[1] = cvPoint(430,240);
spoint1[2] = cvPoint(352,466);
spoint1[3] = cvPoint(440,300);
spoint1[4] = cvPoint(560,450);
spoint1[5] = cvPoint(318,600);
spoint1[6] = cvPoint(100,419);
image = cvCreateImage(imagesize, IPL_DEPTH_8U, 3);
cvFillPoly(image, pts1, npts1, 2, CV_RGB(255,0,0),8,0);
cvShowImage("image", image);
cvWaitKey(0);
}