CentralizedControl/HandyControl/HandyControl_Shared/Tools/Extension/GeometryExtension.cs

using System;
using System.Windows;
using System.Windows.Media;
using HandyControl.Expression.Drawing;

namespace HandyControl.Tools.Extension;

public static class GeometryExtension
{
    /// <summary>
    ///     获取路径总长度
    /// </summary>
    /// <param name="geometry"></param>
    /// <returns></returns>
    public static double GetTotalLength(this Geometry geometry)
    {
        if (geometry == null) return 0;

        var pathGeometry = PathGeometry.CreateFromGeometry(geometry);
        pathGeometry.GetPointAtFractionLength(1e-4, out var point, out _);
        var length = (pathGeometry.Figures[0].StartPoint - point).Length * 1e+4;

        return length;
    }

    /// <summary>
    ///     获取路径总长度
    /// </summary>
    /// <param name="geometry"></param>
    /// <param name="size"></param>
    /// <param name="strokeThickness"></param>
    /// <returns></returns>
    public static double GetTotalLength(this Geometry geometry, Size size, double strokeThickness = 1)
    {
        if (geometry == null) return 0;

        if (MathHelper.IsVerySmall(size.Width) || MathHelper.IsVerySmall(size.Height)) return 0;

        var length = GetTotalLength(geometry);
        var sw = geometry.Bounds.Width / size.Width;
        var sh = geometry.Bounds.Height / size.Height;
        var min = Math.Min(sw, sh);

        if (MathHelper.IsVerySmall(min) || MathHelper.IsVerySmall(strokeThickness)) return 0;

        length /= min;
        return length / strokeThickness;
    }
}