Calculate the distance between two points (2D, 3D)

Project scenario:

Reference: distance between two points

Calculate the distance between two points

Euclidean distance
(Euclidean distance), also known as Euclidean distance, is a commonly used distance definition, which is the real distance between two points in m-dimensional space.

---

solution:

坐标实体类

public class Point {
    
    
    public float x;
    public float y;
    public float z;

    public Point (float x, float y, float z) {
    
    
        this.x = x;
        this.y = y;
        this.z = z;
    }
}

计算方式

2d

/**
     * 计算所有2d点之间的距离.
     *
     * @param coordinates 所有坐标点.
     * @return 返回所有坐标点距离的值
     */
    public static double calculatePointsDistance(List<Point> coordinates) {
    
    
        if (coordinates.size() < 2) {
    
    
            return 0.0;
        }

        if (coordinates.size() == 2) {
    
    
            double powX = Math.pow((coordinates.get(0).x - coordinates.get(1).x), 2);
            double powY = Math.pow((coordinates.get(0).y - coordinates.get(1).y), 2);
            return Math.sqrt(powX + powY);
        }

        double distance = Math.sqrt(Math.pow((coordinates.get(0).x - coordinates.get(coordinates.size() - 1).x), 2)
                + Math.pow((coordinates.get(0).y - coordinates.get(coordinates.size() - 1).y), 2));
        for (int i = 0; i < coordinates.size() - 1; i++) {
    
    
            double powX = Math.pow((coordinates.get(i).x - coordinates.get(i + 1).x), 2);
            double powY = Math.pow((coordinates.get(i).y - coordinates.get(i + 1).y), 2);
            distance += Math.sqrt(powX + powY);
        }
        return distance;
    }

3D

/**
     * 计算所有3d点之间的距离.
     *
     * @param coordinates 所有坐标点.
     * @return 返回所有坐标点距离的值
     */
    public static double calculateTdPointDistance(List<Point> coordinates) {
    
    
        if (coordinates.size() < 2) {
    
    
            return 0.0;
        }
        if (coordinates.size() == 2) {
    
    
            double powX = Math.pow((coordinates.get(0).x - coordinates.get(1).x), 2);
            double powY = Math.pow((coordinates.get(0).y - coordinates.get(1).y), 2);
            double powZ = Math.pow((coordinates.get(0).z - coordinates.get(1).z), 2);
            return Math.sqrt(powX + powY + powZ);
        }
        double distance = Math.sqrt(Math.pow((coordinates.get(0).x - coordinates.get(coordinates.size() - 1).x), 2)
                + Math.pow((coordinates.get(0).y - coordinates.get(coordinates.size() - 1).y), 2)
                + Math.pow((coordinates.get(0).z - coordinates.get(coordinates.size() - 1).z), 2));
        for (int i = 0; i < coordinates.size() - 1; i++) {
    
    
            double powX = Math.pow((coordinates.get(i).x - coordinates.get(i + 1).x), 2);
            double powY = Math.pow((coordinates.get(i).y - coordinates.get(i + 1).y), 2);
            double powZ = Math.pow((coordinates.get(i).z - coordinates.get(i + 1).z), 2);
            distance += Math.sqrt(powX + powY + powZ);
        }
        return distance;
    }