c# GDI+绘制不同字体的字符串

一段字符串中可能既有汉字又有字母，对于汉字和字母分别采用不同的字体进行绘制直接po代码了

 Bitmap bmp = new Bitmap(iWidth, iHeight);
            Graphics g = Graphics.FromImage(bmp);
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
            g.FillRectangle(new SolidBrush(Color.FromArgb(0, 90, 169)), new Rectangle(0, 0, bmp.Width, bmp.Height));
            if (IFYY)
            {
                Font arial = new System.Drawing.Font("Arial", 46F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Pixel, ((byte)(134)));
                StringFormat test = StringFormat.GenericTypographic;
                SizeF size = g.MeasureString(strText, font, 1062, test);
                float fX = (1062 - size.Width) / 2 + 348;
                float fY = (58 - size.Height) / 2 + 960;
                float rowSpace = 0f;
                for (int i = 0; i < strText.Length; i++)
                {
                    string ss = strText[i].ToString();
                    if (ISLetter(strText[i]))
                    {
                        SizeF sf = g.MeasureString(ss, arial);
                        g.DrawString(ss, arial, brushWhite, fX, fY);
                        if (ss == " ")
                        {
                            fX += g.MeasureString(ss, arial).Width + rowSpace;
                        }
                        else
                        {
                            fX += g.MeasureString(ss, arial, 100, test).Width + rowSpace;
                        }
                        //g.DrawString(strText[i].ToString(), arial, brushWhite, rectF, format);
                    }
                    else
                    {
                        g.DrawString(ss, font, brushWhite, fX, fY);
                        fX += g.MeasureString(ss, font, 100, test).Width + rowSpace;
                    }
                    //fX += rowSpace;
                }
            }
            else
            {
                g.DrawString(strText, font, brushWhite, rectF, format);
            }
            
            //g.DrawString(strText, arial, brushWhite, rectF, format);
            g.Dispose();
            bmp.RotateFlip(RotateFlipType.Rotate180FlipX);
            return bmp;
        }

        private static bool ISLetter(char c)
        {
            bool letter = false;
            if (c > 127)
            {
                letter = false;
            }
            else
            {
                letter = true;
            }
            return letter;
        }

　需要注意的是：

       StringFormat test = StringFormat.GenericTypographic;
                SizeF size = g.MeasureString(strText, font, 1062, test);
Graphics.MeasureString()方法，一定要使用如图的形式，否则测算出来的字母宽度不精确