Opencv_08_Point&&Scalar&circle&rectangle&ellipse&line

最新推荐文章于 2024-07-30 14:38:14 发布

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最新推荐文章于 2024-07-30 14:38:14 发布

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本文介绍使用OpenCV进行基本图形绘制的方法，包括直线、矩形、椭圆、圆形及多边形等，并通过随机线条演示展示绘图效果。

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

using namespace std;
using namespace cv;

/*
cv::Point与cv::Scalar
1)Point表示2D平面上的一个点x,y
Point p;
p.x=10;
p.y=8;
or
p=Point(10,8);
2)Scalar表示四个元素的向量
Scalar(a,b,c); a=blue,b=green,c=red表示RGB三个通道
*/

void My_Line();
void My_Rectangle();
void My_Ellipse();
void My_Circle();
void My_Ploygon();
void RandomLinedemo();
const char* drawdemo_win = "draw shapes and test demo";
Mat bgImage;

int main(int argc, char** argv)
{
   string filepath1 = "D:/Learning/Opecv/1.jpg";
   //string filepath2 = "D:/Learning/Opecv/2.jpg";
   //Mat src1, src2, dst;
   bgImage = imread(filepath1);
   //src2 = imread(filepath2);

   if (!bgImage.data)
   {
       cout << "could not load image!!!" << endl;
       return -1;
   }

   //My_Line();
   //My_Rectangle();
   //My_Ellipse();
   //My_Circle();
   //My_Ploygon();

//putText(bgImage, "Hello OpenCV", Point(300, 300), CV_FONT_BLACK, 1.0, Scalar(12, 255, 200), 1, 8);

   char input_image[] = "input_image";
   namedWindow(input_image, CV_WINDOW_AUTOSIZE);
   imshow(input_image, bgImage);

RandomLinedemo();
waitKey(0);

return 0;
}

void My_Line()
{
   Point p1 = Point(20, 30);
   Point p2;
   p2.x = 300;
   p2.y = 300;

Scalar color = Scalar(0, 0, 255);
line(bgImage, p1, p2, color, 1, LINE_AA); //LINE_AA->反锯齿

}

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

void My_Ellipse()
{
Scalar color = Scalar(0, 255, 0);
ellipse(bgImage, Point(bgImage.cols / 2, bgImage.rows / 2), Size(bgImage.cols / 4, bgImage.rows / 8), 90, 0, 630, color, 2, LINE_4);

}

void My_Circle()
{
   Scalar color = Scalar(0, 255, 255);
   Point center = Point(bgImage.cols / 2, bgImage.rows / 2);
   circle(bgImage, center, 50, color, 1, LINE_4);
}

void My_Ploygon()
{
   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 < 10000; 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);
   }
}