openCV內置畫圖函數以及畫虛線函數的實現

話不多說，直接上代碼：

#include <QCoreApplication>

#include <cv.h>

#include <highgui.h>

#include <QDebug>

#include <stdio.h>

void  drawDashRect(CvArr* img,int linelength,int dashlength,CvRect* blob,CvScalar color,int thickness);

int main(int argc, char *argv[])

{

    QCoreApplication a(argc, argv);

    IplImage* cat = cvLoadImage("D:/Pictures/cat.jpg");

    IplImage* dog = cvLoadImage("D:/Pictures/dog.jpg");

    if((cat == NULL) || (dog == NULL))

        return 1;

    qDebug() << "cat-> width = " << cat->width;

    qDebug() << "cat-> height = " <<cat->height;

    qDebug() << "dog-> width = " << dog->width;

    qDebug() << "dog-> height = " <<dog->height;

    printf("cat->widthstep = %d\n",cat->widthStep);

    printf("cat->nChannels = %d\n",cat->nChannels);

    printf("cat->depth = %d\n", cat->depth);

    printf("cat->origin = %d\n",cat->origin);

    printf("cat->dataOrder = %d\n",cat->dataOrder);

    printf("dog->widthstep = %d\n",dog->widthStep);

    printf("dog->nChannels = %d\n",dog->nChannels);

    printf("dog->depth = %d\n", dog->depth);

    printf("dog->origin = %d\n",dog->origin);

    printf("dog->dataOrder = %d\n",dog->dataOrder);

    CvRect rect1, rect2;

    //rect1 = cvScalar(100, 100, 100, 100);

    rect1.x = 300;

    rect1.y = 100;

    rect1.width = 250;

    rect1.height = 250;

    rect2.x = 400;

    rect2.y = 400;

    rect2.width = 250;

    rect2.height = 250;

    double alpha = 0.1;

    double beta = 1 - alpha;

    double gamma = 0.0;

    cvSetImageROI(cat, rect1);

    cvSetImageROI(dog, rect2);

    cvAddWeighted(cat, alpha, dog, beta, gamma, cat);

    cvResetImageROI(cat);

    //在圖上畫個矩形框

    cvRectangle(cat, cvPoint(5, 10), cvPoint(30, 40), cvScalar(201, 102, 62), 3, 4, 0 );

    //在圖上畫個橢圓(法1：直接法)

    cvEllipse(cat, cvPoint(200, 200),cvSize(84, 36),45,0,360,cvScalar(0x00, 0x00, 0xff), 3);

    //在圖上畫個橢圓(法2：外接矩形法)

    CvBox2D box;

    box.center = cvPoint2D32f(400, 200);

    box.angle = 45;

    box.size = cvSize2D32f(100, 50);

    cvEllipseBox(cat,box,cvScalar(0x00, 0xff, 0x00), 3);

    //在圖上畫個圓

    cvCircle(cat, cvPoint(300, 300),50, cvScalar(0xff, 0x00, 0x00),3);

    //在圖上打印文本

    CvFont font1;

    cvInitFont(&font1,CV_FONT_HERSHEY_SCRIPT_SIMPLEX,1,1,1,1);

    cvPutText(cat, "Hello Cat 2222",cvPoint(200, 200),&font1,cvScalar(0xff,0x00,0x00));

    //畫虛線矩形框。。。外部函數實現！！！

    CvRect rect11 = cvRect(100,200,200,100);

    drawDashRect(cat,1,2,&rect11,CV_RGB(255,0,0),1);

    cvNamedWindow("Alpha_beta", 1);

    cvMoveWindow("Alpha_beta", 500, 500);

    cvShowImage("Alpha_beta", cat);

    cvWaitKey(0);

    return a.exec();

}

void  drawDashRect(CvArr* img,int linelength,int dashlength,CvRect* blob,CvScalar color,int thickness)

{

    int w=cvRound(blob->width);//width，對一個double型的數進行四捨五入，並返回一個整型數

    int h=cvRound(blob->height);//height

    int tl_x=cvRound(blob->x);//top left x

    int tl_y=cvRound(blob->y);//top  left y

    int totallength=dashlength+linelength;

    int nCountX=w/totallength;//

    int nCountY=h/totallength;//

    CvPoint start,end;//start and end point of each dash

    //draw the horizontal lines

    start.y=tl_y;

    start.x=tl_x;

    end.x=tl_x;

    end.y=tl_y;

    for (int i=0;i<nCountX;i++)

    {

        end.x=tl_x+(i+1)*totallength-dashlength;//draw top dash line

        end.y=tl_y;

        start.x=tl_x+i*totallength;

        start.y=tl_y;

        cvLine(img,start,end,color,thickness);

    }

    for (int i=0;i<nCountX;i++)

    {

        start.x=tl_x+i*totallength;

        start.y=tl_y+h;

        end.x=tl_x+(i+1)*totallength-dashlength;//draw bottom dash line

        end.y=tl_y+h;

        cvLine(img,start,end,color,thickness);

    }

    for (int i=0;i<nCountY;i++)

    {

        start.x=tl_x;

        start.y=tl_y+i*totallength;

        end.y=tl_y+(i+1)*totallength-dashlength;//draw left dash line

        end.x=tl_x;

        cvLine(img,start,end,color,thickness);

    }

    for (int i=0;i<nCountY;i++)

    {

        start.x=tl_x+w;

        start.y=tl_y+i*totallength;

        end.y=tl_y+(i+1)*totallength-dashlength;//draw right dash line

        end.x=tl_x+w;

        cvLine(img,start,end,color,thickness);

    }

}