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

namespace AntdUI.Svg
{
    public class GdiFontDefn : IFontDefn
    {
        private Font _font;

        public float Size
        {
            get { return _font.Size; }
        }
        public float SizeInPoints
        {
            get { return _font.SizeInPoints; }
        }

        public GdiFontDefn(Font font)
        {
            _font = font;
        }

        public void AddStringToPath(ISvgRenderer renderer, GraphicsPath path, string text, PointF location)
        {
            path.AddString(text, _font.FontFamily, (int)_font.Style, _font.Size, location, StringFormat.GenericTypographic);
        }

        //Baseline calculation to match http://bobpowell.net/formattingtext.aspx
        public float Ascent(ISvgRenderer renderer)
        {
            var ff = _font.FontFamily;
            float ascent = ff.GetCellAscent(_font.Style);
            float baselineOffset = _font.SizeInPoints / ff.GetEmHeight(_font.Style) * ascent;
            return SvgDocument.Ppi / 72f * baselineOffset;
        }

        public IList<RectangleF> MeasureCharacters(ISvgRenderer renderer, string text)
        {
            var g = GetGraphics(renderer);
            var regions = new List<RectangleF>();
            StringFormat format;
            for (int s = 0; s <= (text.Length - 1) / 32; s++)
            {
                format = StringFormat.GenericTypographic;
                format.FormatFlags |= StringFormatFlags.MeasureTrailingSpaces;
                format.SetMeasurableCharacterRanges((from r in Enumerable.Range(32 * s, Math.Min(32, text.Length - 32 * s))
                                                     select new CharacterRange(r, 1)).ToArray());
                regions.AddRange(from r in g.MeasureCharacterRanges(text, _font, new Rectangle(0, 0, 1000, 1000), format)
                                 select r.GetBounds(g));
            }
            return regions;