AutoPatientInfoRecorder/src/AntdUI/Lib/SVG/Clipping and Masking/SvgClipPath.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 AntdUI.Svg.Transforms;
using System.Drawing;
using System.Drawing.Drawing2D;

namespace AntdUI.Svg
{
    /// <summary>
    /// Defines a path that can be used by other <see cref="ISvgClipable"/> elements.
    /// </summary>
    public sealed class SvgClipPath : SvgElement
    {
        public override string ClassName { get => "clipPath"; }

        private bool _pathDirty = true;

        /// <summary>
        /// Specifies the coordinate system for the clipping path.
        /// </summary>
        [SvgAttribute("clipPathUnits")]
        public SvgCoordinateUnits ClipPathUnits { get; set; }

        /// <summary>
        /// Initializes a new instance of the <see cref="SvgClipPath"/> class.
        /// </summary>
        public SvgClipPath()
        {
            ClipPathUnits = SvgCoordinateUnits.Inherit;
        }

        private GraphicsPath cachedClipPath = null;

        /// <summary>
        /// Gets this <see cref="SvgClipPath"/>'s region to be used as a clipping region.
        /// </summary>
        /// <returns>A new <see cref="Region"/> containing the <see cref="Region"/> to be used for clipping.</returns>
        public Region GetClipRegion(SvgVisualElement owner)
        {
            if (cachedClipPath == null || _pathDirty)
            {
                cachedClipPath = new GraphicsPath();

                foreach (SvgElement element in Children)
                {
                    CombinePaths(cachedClipPath, element);
                }

                _pathDirty = false;
            }

            var result = cachedClipPath;
            if (ClipPathUnits == SvgCoordinateUnits.ObjectBoundingBox)
            {
                result = (GraphicsPath)cachedClipPath.Clone();
                using (var transform = new Matrix())
                {