转载请标注原文地址：https://www.cnblogs.com/nanyunan/p/13546143.html

一、测量方案

        public static SizeF MeasureString(string Text,Font f,StringFormat sf)
        {
            GraphicsPath path = new GraphicsPath();
            path.AddString(Text,f.FontFamily,(int)f.Style,f.Size,new PointF(0,0),sf);
            return path.GetBounds().Size;

        }

        public static SizeF MeasureString(string Text, Font f)
        {
            GraphicsPath path = new GraphicsPath();
            path.AddString(Text, f.FontFamily, (int)f.Style, f.Size, new PointF(0, 0), new StringFormat());
            return path.GetBounds().Size;

        }

        public static SizeF MeasureString(string Text, Font f, StringFormat sf,Rectangle rect)
        {
            GraphicsPath path = new GraphicsPath();
            path.AddString(Text, f.FontFamily, (int)f.Style, f.Size, rect, sf);
            return path.GetBounds().Size;

        }

        public static SizeF MeasureString(string Text, Font f, StringFormat sf, int Width)
        {
            GraphicsPath path = new GraphicsPath();
            path.AddString(Text, f.FontFamily, (int)f.Style, f.Size, new Rectangle(0, 0, Width, int.MaxValue), sf);
            return path.GetBounds().Size;
        }

        public static SizeF MeasureString(string Text, Font f,int Width)
        {
            GraphicsPath path = new GraphicsPath();
            path.AddString(Text, f.FontFamily, (int)f.Style, f.Size, new Rectangle(0, 0, Width, int.MaxValue), new StringFormat());
            return path.GetBounds().Size;
        }

二、计算填充空间的字体大小

        /// <summary>
        /// 自适应字体大小
        /// </summary>
        /// <param name="Text"></param>
        /// <param name="Width"></param>
        /// <param name="Height"></param>
        /// <param name="f"></param>
        /// <returns></returns>
        public static Font GetFont(string Text,float Width,float Height,Font f)
        {
            Font tmp = new Font(f.FontFamily, f.Size, f.Style, GraphicsUnit.Point);
            int count = 0;
            while (true)
            {
                var size = MeasureString(Text, tmp, (int)Width);
                var rw = Width / size.Width;
                var rh = Height / size.Height;
                var rmin = rw > rh ? rh : rw;
                if (Math.Abs(rmin - 1) < 0.01 || (count++)>10)
                {
                    return new Font(tmp.FontFamily, tmp.Size, tmp.Style, GraphicsUnit.Point);
                }
                var t = tmp;
                tmp = new Font(tmp.FontFamily, rmin*tmp.Size, tmp.Style, GraphicsUnit.Point);
                t.Dispose();
            }
            
            
        }

 

三、精确绘制

        public void Draw(Bitmap Canvas,string Text,Font f,int x,int y)
        {
            Graphics g = Graphics.FromImage(Canvas);
            StringFormat sf = new StringFormat();
            GraphicsPath Path = new GraphicsPath();
            Path.AddString(Text, f.FontFamily, (int)f.Style, f.Size, new PointF(0, 0), sf);
            var PathBounds = Path.GetBounds();//计算偏移
            var dx = x - PathBounds.X;
            var dy = y - PathBounds.Y;
            Path = new GraphicsPath();//重置
            Path.AddString(Text, f.FontFamily, (int)f.Style, f.Size, new PointF(dx,dy), sf);
            g.FillPath(Brushes.Black, Path);
            g.Dispose();
        }