AutoPatientInfoRecorder/src/AntdUI/Lib/SVG/Paths/SvgArcSegment.cs

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// THIS FILE IS PART OF SVG PROJECT
// THE SVG PROJECT IS AN OPENSOURCE LIBRARY LICENSED UNDER THE MS-PL License.
// COPYRIGHT (C) svg-net. ALL RIGHTS RESERVED.
// GITHUB: https://github.com/svg-net/SVG

using System;
using System.Drawing;
using System.Drawing.Drawing2D;

namespace AntdUI.Svg.Pathing
{
    public sealed class SvgArcSegment : SvgPathSegment
    {
        private const double RadiansPerDegree = Math.PI / 180.0;
        private const double DoublePI = Math.PI * 2;

        public float RadiusX { get; set; }
        public float RadiusY { get; set; }

        public float Angle { get; set; }

        public SvgArcSweep Sweep { get; set; }
        public SvgArcSize Size { get; set; }

        public SvgArcSegment(PointF start, float radiusX, float radiusY, float angle, SvgArcSize size, SvgArcSweep sweep, PointF end)
            : base(start, end)
        {
            RadiusX = Math.Abs(radiusX);
            RadiusY = Math.Abs(radiusY);
            Angle = angle;
            Sweep = sweep;
            Size = size;
        }

        private static double CalculateVectorAngle(double ux, double uy, double vx, double vy)
        {
            double ta = Math.Atan2(uy, ux);
            double tb = Math.Atan2(vy, vx);

            if (tb >= ta) return tb - ta;

            return DoublePI - (ta - tb);
        }

        public override void AddToPath(GraphicsPath graphicsPath)
        {
            if (Start == End) return;
            if (RadiusX == 0.0f && RadiusY == 0.0f)
            {
                graphicsPath.AddLine(Start, End);
                return;
            }

            double sinPhi = Math.Sin(Angle * RadiansPerDegree);
            double cosPhi = Math.Cos(Angle * RadiansPerDegree);

            double x1dash = cosPhi * (Start.X - End.X) / 2.0 + sinPhi * (Start.Y - End.Y) / 2.0;
            double y1dash = -sinPhi * (Start.X - End.X) / 2.0 + cosPhi * (Start.Y - End.Y) / 2.0;

            double root;