AutoPatientInfoRecorder/src/AntdUI/Lib/SVG/Text/SvgFontDefn.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.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;

namespace AntdUI.Svg
{
    public class SvgFontDefn : IFontDefn
    {
        private SvgFont _font;
        private float _emScale;
        private float _ppi;
        private float _size;
        private Dictionary<string, SvgGlyph> _glyphs;
        private Dictionary<string, SvgKern> _kerning;

        public float Size
        {
            get { return _size; }
        }

        public float SizeInPoints
        {
            get { return _size * 72.0f / _ppi; }
        }

        public SvgFontDefn(SvgFont font, float size, float ppi)
        {
            _font = font;
            _size = size;
            _ppi = ppi;
            var face = _font.Children.OfType<SvgFontFace>().First();
            _emScale = _size / face.UnitsPerEm;
        }

        public float Ascent(ISvgRenderer renderer)
        {
            float ascent = _font.Descendants().OfType<SvgFontFace>().First().Ascent;
            float baselineOffset = SizeInPoints * (_emScale / _size) * ascent;
            return SvgDocument.Ppi / 72f * baselineOffset;
        }

        public IList<System.Drawing.RectangleF> MeasureCharacters(ISvgRenderer renderer, string text)
        {
            var result = new List<RectangleF>();
            using (var path = GetPath(renderer, text, result, false)) { }
            return result;
        }

        public System.Drawing.SizeF MeasureString(ISvgRenderer renderer, string text)
        {
            var result = new List<RectangleF>();
            using (var path = GetPath(renderer, text, result, true)) { }
            var nonEmpty = result.Where(r => r != RectangleF.Empty);
            if (!nonEmpty.Any()) return SizeF.Empty;