OpenCV用C画线代码示例

#include <imgproc/imgproc_c.h>
#include <highgui/highgui_c.h>
#include <core/core_c.h>
//注意opencv要求格式为gbr，会导致红蓝颠倒
int gh_trace_draw_track(FrameData* pFrame)
{
    CvPoint p1;
    CvPoint p2;
    CvScalar color;
    CvSize size;
    if (!(pFrame->buffer.data))
    {
        return 0;
    }
    size.width = pFrame->size2d.width;
    size.height= pFrame->size2d.height;
    //根据不同格式，使用对应的大小
    IplImage* iplImage = cvCreateImageHeader(size, IPL_DEPTH_8U, SIZE_ARGB);
    cvSetData(iplImage, pFrame->buffer.data, size.width*SIZE_ARGB);
    p1.x = 0;
    p1.y = 0;
    p2.x = size.width;
    p2.y = size.height;
    color.val[0] = 0xFF;
    color.val[1] = 0;
    color.val[2] = 0xFF;
    color.val[3] = 0;
    //　可以用cvPoint(x1,y1)的写法
    cvLine(iplImage, p1, p2, color, 1, 8, 0);
    return 0;
}

cvRectangle(iplImage, cvPoint(x1,y1), cvPoint(x2,y2), color, CV_FILLED, 8, 0);