Draw Line on Image using OpenCV

OpenCV provides functionality for drawing geometric shapes such as line, rectangle, circle, etc.

The line function can be used to draw a line between two points by specifying x and y coordinates for each of them.

import cv2
import numpy as np

img = np.zeros((100, 300, 3), dtype=np.uint8)

x1, y1 = 100, 20
x2, y2 = 200, 70
cv2.line(img, (x1, y1), (x2, y2), (0, 255, 0), 2)

cv2.imshow('Image', img)
cv2.waitKey(0)
cv2.destroyAllWindows()

#include <opencv2/opencv.hpp>

using namespace cv;

int main()
{
    Mat img = Mat::zeros(100, 300, CV_8UC3);

    int x1 = 100, y1 = 20;
    int x2 = 200, y2 = 70;
    line(img, Point(x1, y1), Point(x2, y2), Scalar(0, 255, 0), 2);

    imshow("Image", img);
    waitKey(0);
    destroyAllWindows();

    return 0;
}

package app;

import org.opencv.core.*;
import org.opencv.highgui.HighGui;
import org.opencv.imgproc.Imgproc;

public class Main
{
    static { System.loadLibrary(Core.NATIVE_LIBRARY_NAME); }

    public static void main(String[] args)
    {
        Mat img = Mat.zeros(100, 300, CvType.CV_8UC3);

        int x1 = 100, y1 = 20;
        int x2 = 200, y2 = 70;
        Imgproc.line(img, new Point(x1, y1), new Point(x2, y2), new Scalar(0, 255, 0), 2);

        HighGui.imshow("Image", img);
        HighGui.waitKey(0);
        HighGui.destroyAllWindows();

        System.exit(0);
    }
}

Result: