OpenCV有很多函数可以绘制各种形状，如直线、矩形、圆形等。
该arrowedLine函数通过为每个点指定 x 和 y 坐标来绘制一条从第一个点指向第二个点的箭头线。
import cv2
import numpy as np
img = np.zeros((100, 300, 3), dtype=np.uint8)
x1, y1 = 100, 20
x2, y2 = 200, 70
color = (0, 255, 0)
thickness = 2
cv2.arrowedLine(img, (x1, y1), (x2, y2), color, thickness)
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;
Scalar color(0, 255, 0);
int thickness = 2;
arrowedLine(img, Point(x1, y1), Point(x2, y2), color, thickness);
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;
Scalar color = new Scalar(0, 255, 0);
int thickness = 2;
Imgproc.arrowedLine(img, new Point(x1, y1), new Point(x2, y2), color, thickness);
HighGui.imshow("Image", img);
HighGui.waitKey(0);
HighGui.destroyAllWindows();
System.exit(0);
}
}结果：
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