AutoWeight/EC.Utils/Helper/WaterMarkHelper.cs

using System;
using System.Drawing;

namespace ImageClient
{
	public class WaterMarkHelper
	{
		/// <summary>
		/// 添加水印
		/// </summary>
		/// <param name="imgPath">原图片地址</param>
		/// <param name="sImgPath">水印图片地址</param>
		/// <returns>resMsg[0] 成功,失败 </returns>
		public static string[] AddWaterMark(string imgPath, string sImgPath, string text, string color, int fontSize, int left, int top)
		{
			string[] resMsg = new[] { "成功", sImgPath };
			using (Image image = Image.FromFile(imgPath))
			{
				try
				{
					Bitmap bitmap = new Bitmap(image);

					int width = bitmap.Width, height = bitmap.Height;

					Graphics g = Graphics.FromImage(bitmap);

					g.DrawImage(bitmap, 0, 0);

					g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

					g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

					g.DrawImage(image, new Rectangle(0, 0, width, height), 0, 0, width, height, GraphicsUnit.Pixel);

					Font crFont = new Font("微软雅黑", fontSize, FontStyle.Bold);
					SizeF crSize = new SizeF();
					crSize = g.MeasureString(text, crFont);

					//背景位置(去掉了. 如果想用可以自己调一调 位置.)
					//graphics.FillRectangle(new SolidBrush(Color.FromArgb(200, 255, 255, 255)), (width - crSize.Width) / 2, (height - crSize.Height) / 2, crSize.Width, crSize.Height);

					//SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(120, 0, 0, 0));
					SolidBrush semiTransBrush = new SolidBrush(ColorTranslator.FromHtml(color));

					//将原点移动 到图片中点
					g.TranslateTransform(left, top);
					//以原点为中心 转 -45度
					// g.RotateTransform(-45);

					g.DrawString(text, crFont, semiTransBrush, new PointF(0, 0));

					//保存文件
					bitmap.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg);
				}
				catch (Exception e)
				{
					resMsg[0] = "失败";
					resMsg[1] = e.Message;
				}
			}

			return resMsg;
		}
	}
}