opencv 绘制形状与文字

#include <opencv2/opencv.hpp>
#include <iostream>

using namespace std;
using namespace cv;

Mat bgImage;
const char* drawdemo_win = "draw shapes and text demo";
void MyLines();
void MyRectangle();
void MyEllipse();
void MyCircle();
void MyPolygon();
void RandomLineDemo();

int main(int argc, char** argv) {
    bgImage = imread("D:/vcprojects/images/test.jpg");
    if (!bgImage.data) {
        printf("could not load image...\n");
        return -1;
    }

    printf("version:%s\n", CV_VERSION);


    MyLines();
    MyRectangle();
    MyEllipse();
    MyCircle();
    MyPolygon();

    putText(bgImage, "Hello OpenCV", 
            Point(100, 300), 
            CV_FONT_HERSHEY_COMPLEX, 
            1.0, Scalar(12, 23, 200), 3, 8);

    namedWindow(drawdemo_win, CV_WINDOW_AUTOSIZE);
    imshow(drawdemo_win, bgImage);

    RandomLineDemo();

    waitKey(0);
    return 0;
}

void MyLines() {
    Point p1 = Point(20, 30);
    Point p2;
    p2.x = 400;
    p2.y = 400;
    Scalar color = Scalar(0, 0, 255);
    line(bgImage, p1, p2, color, 1, LINE_AA);
}

void MyRectangle() {
    Rect rect = Rect(200, 100, 300, 300);
    Scalar color = Scalar(255, 0, 0);
    rectangle(bgImage, rect, color, 2, LINE_8);
}

void MyEllipse() {
    Scalar color = Scalar(0, 255, 0);

    ellipse(bgImage,
        Point(bgImage.cols / 2, bgImage.rows / 2), 
        Size(bgImage.cols / 4, bgImage.rows / 8), 
        90, 0, 360, color, 2, LINE_8);

}

void MyCircle() {
    Scalar color = Scalar(0, 255, 255);
    Point center = Point(bgImage.cols / 2, bgImage.rows / 2);
    circle(bgImage, center, 150, color, 2, 8);
}

void MyPolygon() {
    Point pts[1][5];
    pts[0][0] = Point(100, 100);
    pts[0][1] = Point(100, 200);
    pts[0][2] = Point(200, 200);
    pts[0][3] = Point(200, 100);
    pts[0][4] = Point(100, 100);

    const Point* ppts[] = { pts[0] };
    int npt[] = { 5 };
    Scalar color = Scalar(255, 12, 255);

    fillPoly(bgImage, ppts, npt, 1, color, 8);
}

void RandomLineDemo() {
    RNG rng(12345);
    Point pt1;
    Point pt2;
    Mat bg = Mat::zeros(bgImage.size(), bgImage.type());
    namedWindow("random line demo", CV_WINDOW_AUTOSIZE);
    for (int i = 0; i < 100000; i++) {
        pt1.x = rng.uniform(0, bgImage.cols);
        pt2.x = rng.uniform(0, bgImage.cols);
        pt1.y = rng.uniform(0, bgImage.rows);
        pt2.y = rng.uniform(0, bgImage.rows);
        Scalar color = Scalar(rng.uniform(0, 255), rng.uniform(0, 255), rng.uniform(0, 255));
        if (waitKey(50) > 0) {
            break;
        }
        line(bg, pt1, pt2, color, 1, 8);
        imshow("random line demo", bg);
    }
}