007-Opencv笔记-绘制形状与文字

#include "pch.h"
#include <opencv2/opencv.hpp>
#include <iostream>

using namespace std;
using namespace cv;
Mat bgImage;
const char* drawdemo_win = "root";
void MyLines();
void MyRectangle();
void MyEllipse();
void MyCircle();
void MyPolygon();
void RandomLineDemo();
//绘制形状与文字

int main(int argc, char** argv) {

    bgImage = Mat(600, 600, CV_8UC3, Scalar(255, 255, 255));

    imshow(drawdemo_win,bgImage);
    //MyLines();
    //MyRectangle();
    //MyEllipse();
    //MyCircle();
    //MyPolygon();
    //图片-文字-文本左下角-字体-尺寸-颜色-宽度-类型
    putText(bgImage, "Hello OpenCV", Point(300, 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;
}
//画线
void MyLines() {
    Point p1 = Point(20, 30);
    Point p2;
    p2.x = 400;
    p2.y = 400;
    Scalar color = Scalar(0, 0, 255);
    //参数1:图像,参数2,直线起点,参数3,直线颜色,参数4:线条粗细,参数5:线条种类 8/0 8邻线, 4 4邻线, CV_AA antialiased 线条, 参数6 坐标的小数点位数
    line(bgImage, p1, p2, color, 1, 16);
    line(bgImage, Point(20, 50), Point(400, 450), Scalar(0, 255, 0), 1, 4);
    line(bgImage, Point(20, 70), Point(400, 500), Scalar(255, 0, 0), 4, CV_AA);
    line(bgImage, Point(20,90), Point(400,550), Scalar(50,120,0), 1, CV_AA);

}
//矩形
void MyRectangle() {
    //参数一,参数二,
    Rect rect = Rect(200, 100, 300, 300);
    Scalar color = Scalar(255, 0, 0);
    rectangle(bgImage, rect, color, 2, 8);
}
//椭圆圆弧和椭圆扇形
void MyEllipse() {
    //图像-椭圆圆心-轴的长度-偏转的角度-圆弧起始角度-圆弧结束角度-圆弧颜色-线条粗细-线条类型-圆心坐标点和数轴的精度
    Scalar color = Scalar(0, 255, 0);
    Scalar color2 = Scalar(255, 255, 0);
    Scalar color3 = Scalar(0, 255, 255);
    ellipse(bgImage, Point(bgImage.cols / 2, bgImage.rows / 2), Size(bgImage.cols / 4, bgImage.rows / 8), 90, 0, 360, color, 2, 8);
    ellipse(bgImage, Point(bgImage.cols / 2, bgImage.rows / 2), Size(bgImage.cols / 4, bgImage.rows / 4), 90, 0, 360, color2, 2, 8);
    ellipse(bgImage, Point(bgImage.cols / 2, bgImage.rows / 2), Size(bgImage.cols / 4, bgImage.rows / 8), 0, 0, 270, color3, 2, 8);
}
//画圆
void MyCircle() {
    Scalar color = Scalar(0, 255, 255);
    Point center = Point(bgImage.cols / 2, bgImage.rows / 2);
    circle(bgImage, center, 150, color, 2, 8);
}
//多边形
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);
}
//随机线
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);
    }
}

效果1
效果2
效果3
效果4