C#基于两种需求向图片添加水印

static void addWatermarkText(Graphics picture,int fontsize, string _watermarkText, string _watermarkPosition, int _width, int _height)
        {
            int[] sizes = new int[] {32, 14, 12, 10, 8, 6, 4 };
            Font crFont = null;
            SizeF crSize = new SizeF();

            crFont = new Font("微软雅黑", fontsize, FontStyle.Bold);
            crSize = picture.MeasureString(_watermarkText, crFont);

            float xpos = 0;
            float ypos = 0;
            Color color =Color.Firebrick;

            switch (_watermarkPosition)
            {
                case "WM_TOP_LEFT":
                    xpos = ((float)_width * (float).01) + (crSize.Width / 2);
                    ypos = (float)_height * (float).01;
                    break;
                case "WM_TOP_RIGHT":
                    xpos = ((float)_width * (float).99) - (crSize.Width / 2);
                    ypos = (float)_height * (float).01;
                    break;
                case "WM_BOTTOM_RIGHT":
                    xpos = ((float)_width * (float).99) - (crSize.Width / 2);
                    ypos = ((float)_height * (float).99) - crSize.Height;
                    break;
                case "WM_BOTTOM_LEFT":
                    xpos = ((float)_width * (float).01) + (crSize.Width / 2);
                    ypos = ((float)_height * (float).99) - crSize.Height;
                    break;
                
            }
            
            StringFormat StrFormat = new StringFormat();
            StrFormat.Alignment = StringAlignment.Center;
            SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(153, 0, 0, 0));//加阴影
            picture.DrawString(_watermarkText, crFont, semiTransBrush2, xpos + 1, ypos + 1, StrFormat);

            SolidBrush semiTransBrush = new SolidBrush(color);  //添加水印
            picture.DrawString(_watermarkText, crFont, semiTransBrush, xpos, ypos, StrFormat);

            semiTransBrush2.Dispose();
            semiTransBrush.Dispose();
        }

static void addWatermarkText(Graphics picture,string type, int fontsize, string _watermarkText)
        {
            //1、先画矩形
            RectangleF drawRect;
            Color color;
            if (type == "Top")
            {
                 drawRect = new RectangleF(73, 135, 450, 64);
                 color = Color.FromArgb(255, 255, 255);
            }
            else
            {
                 drawRect = new RectangleF(194, 245, 250, 39);
                 color = Color.FromArgb(244, 226, 38);
            }
            
            //2、在基于矩形画水印文字
            Font crFont = null;

            StringFormat StrFormat = new StringFormat();
            StrFormat.Alignment = StringAlignment.Center;

            crFont = new Font("微软雅黑", fontsize, FontStyle.Bold);
            SolidBrush semiTransBrush = new SolidBrush(color);  //添加水印
            picture.DrawString(_watermarkText, crFont, semiTransBrush, drawRect, StrFormat);

            semiTransBrush.Dispose();
        }