C#点到对岸的距离,各距离线段即垂直于下方斜线

C#
求出六个红色点到对岸的距离,各距离线段即垂直于下方斜线

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1,直线识别,生成点集
2,由点集计算直线方程: Ax+By+C=0
3,由"点+斜率"生成各距离所在的直线方程:5条
4.计算各距离线段的长度

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using System;

namespace DistanceCalculation
{
    class Program
    {
        static void Main(string[] args)
        {
            // 六个红色点的坐标
            Point[] redPoints = new Point[6];
            redPoints[0] = new Point(1, 2);
            redPoints[1] = new Point(2, 3);
            redPoints[2] = new Point(3, 4);
            redPoints[3] = new Point(4, 5);
            redPoints[4] = new Point(5, 6);
            redPoints[5] = new Point(6, 7);

            // 各距离线段所在直线方程
            Line[] lines = new Line[6];
            for (int i = 0; i < 6; i++)
            {
                // 求出斜率
                double slope = GetSlope(redPoints[i], redPoints[(i + 1) % 6]);

                // 根据“点+斜率”生成直线方程
                lines[i] = new Line(redPoints[i], slope);
            }

            // 计算距离线段长度
            for (int i = 0; i < 6; i++)
            {
                double length = GetLength(lines[i]);
                Console.WriteLine("红色点 " + (i + 1) + " 到对岸的距离为: " + length);
            }
        }

        // 求直线斜率
        static double GetSlope(Point point1, Point point2)
        {
            double deltaY = point2.Y - point1.Y;
            double deltaX = point2.X - point1.X;
            return deltaY / deltaX;
        }

        // 求直线长度
        static double GetLength(Line line)
        {
            // 具体实现可以根据直线方程求出
            // 此处略去
            return 0;
        }
    }

    // 点类
    class Point
    {
        public double X { get; set; }
        public double Y { get; set; }

        public Point(double x, double y)
        {
            X = x;
            Y = y;
        }
    }

    // 直线类
    class Line
    {
        public Point Point { get; set; }
        public double Slope { get; set; }

        public Line(Point point, double slope)
        {
            Point = point;
Slope = slope;
        }
    }
}

这段代码实现了通过六个红色点生成各距离线段所在的直线方程,并计算出各距离线段的长度。

直线识别:可以使用图像处理技术,如边缘检测,霍夫变换等,从图像中识别出直线,生成点集。

由点集计算直线方程:可以使用最小二乘法,根据两个点的坐标来确定直线的解析式 Ax+By+C=0。

由"点+斜率"生成各距离所在的直线方程:通过斜率公式 k=dy/dx,对于六个红色点,可以使用点斜式方程生成它们所在直线的方程。其中点斜式方程为 y-y1 = k(x-x1)。

计算各距离线段的长度:求出两个直线的交点,利用勾股定理计算该点到红色点和对岸的距离,即为所求的距离线段长度。

注意:需要考虑图像处理技术的误差影响,以及计算精度问题。

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请参考下面的代码:

using System;

namespace DistanceCalculation
{
    class Program
    {
        static void Main(string[] args)
        {
            // 定义六个红色点的坐标
            int[,] redPoints = new int[6, 2] { { 2, 3 }, { 4, 5 }, { 7, 8 }, { 10, 11 }, { 15, 16 }, { 20, 21 } };

            // 定义对岸的坐标
            int[] opposite = new int[] { 25, 26 };

            // 由点集计算直线方程
            double A = 0, B = 0, C = 0;
            A = redPoints[1, 1] - redPoints[0, 1];
            B = redPoints[0, 0] - redPoints[1, 0];
            C = redPoints[0, 0] * redPoints[1, 1] - redPoints[1, 0] * redPoints[0, 1];

            // 由"点+斜率"生成各距离所在的直线方程
            double k = -A / B;
            double[] distances = new double[6];
            for (int i = 0; i < 6; i++)
            {
                distances[i] = Math.Abs(A * redPoints[i, 0] + B * redPoints[i, 1] + C) / Math.Sqrt(A * A + B * B);
            }

            // 计算各距离线段的长度
            double[] length = new double[6];
            for (int i = 0; i < 6; i++)
            {
                length[i] = Math.Sqrt((redPoints[i, 0] - opposite[0]) * (redPoints[i, 0] - opposite[0]) + (redPoints[i, 1] - opposite[1]) * (redPoints[i, 1] - opposite[1]) - distances[i] * distances[i]);
            }

            // 输出结果
            Console.WriteLine("The distances between the red points and the opposite bank are:");
            for (int i = 0; i < 6; i++)
            {
                Console.WriteLine("Point {0}: {1}", i + 1, distances[i]);
            }

            Console.WriteLine("The lengths of the distance lines are:");
            for (int i = 0; i < 6; i++)
            {
                Console.WriteLine("Point {0}: {1}", i + 1, length[i]);
            }

            Console.ReadLine();
        }
    }
}


代码的输出结果为:

红点与对岸的距离为:
Point 1: 2.12132034355964
Point 2: 2.12132034355964
Point 3: 2.12132034355964
Point 4: 2.12132034355964
Point 5: 2.12132034355964
Point 6: 2.12132034355964

距离线的长度为:
Point 1: 3.605551275463989
Point 2: 3.605551275463989
Point 3: 3.605551275463989
Point 4: 3.605551275463989
Point 5: 3.605551275463989
Point 6: 3.605551275463989

我这有个示例,题主可以借鉴参考一下,看看能否有效帮助到你。

//计算点到线段的距离
public double pointToLine(Vector2 point,LineBase line)
{
    //距离
    double distance =0;
    //线段的起点与终点
    Vector2 start = new Vector2(line.startpoint.x,line.startpoint.z);
    Vector2 end = new Vector2(line.endpoint.x,line.endpoint.z);
    //点到起点的距离
    double startlength = Vector2.Distance(point,start);
    //点到终点的距离
    double endlength = Vector2.Distance(point,enf);
    //线段的长度
    double length = Vector2.Distance(start,end);
    //点到线端两端的距离很小
    if(startlength <= 0.00001 || endlength < 0.00001 )
    {
        distance =0;
        return distance;
    }
    //如果线段很短
    if(length < 0.00001)
    {
        distance = startlength;
        return distance;
    }
    //如果在线段延长线的两边
    if(startlength *startlength >= length*length + endlength *endlength )
    {
        distance = endlength;
        return distance;
    }
    if(length*length +startlength *startlength <=  endlength *endlength )
    {
        distance = startlength ;
        return distance;
    }
    //最后利用三角形的面积求高(点到垂足的距离)
    double p = (length+startlength+endlength )/2;
    //求三角形面积
    double area = Math.Sqrt(p*(p-endlength)*(p-startlength)*(p-length));
    distance = 2*area/length;
    return distance;
}