学步园

给图片加水印好玩的事,不过也不好玩就是麻烦啊.调了不少次,别的不说了上代码吧

    private void WaterMakeString(string sourceFile, string targetFile, string waterString, int postion, int border, float opacity, bool deleteSource, int scale)
    {
        if (opacity < 0 || opacity > 1)
            throw new Exception("透明度的值应该在0~1之间的float型数值");
        System.Drawing.Image SourceImage = System.Drawing.Image.FromFile(sourceFile);

        //System.Drawing.Image WaterImage = (System.Drawing.Image)CreateCheckCodeImage(waterString);
        Bitmap OutPut = new Bitmap(SourceImage);
        Graphics GImage = Graphics.FromImage(OutPut);

        #region 得到字的长宽
        Font drawFont = new Font(FontFamily.GenericSansSerif, 10, FontStyle.Regular, GraphicsUnit.Pixel);
        SizeF crSize;
        crSize = GImage.MeasureString( waterString,drawFont);
        #region
        string w = crSize.Width.ToString();
        string h = crSize.Height.ToString();

        #region 按比例计算水印图片大小
        int width = (int)crSize.Width, height = (int)crSize.Height;
        //if (scale > 0)
        //{
        //    float floatScale = (float)scale / 100;
        //    width = (int)((float)SourceImage.Width * floatScale);
        //    float zoomScale = (float)width / (float)WaterImage.Width;
        //    height = (int)(zoomScale * (float)WaterImage.Height);
        //    if (height > (float)SourceImage.Height * floatScale)
        //    {
        //        zoomScale = (float)SourceImage.Height * floatScale / (float)WaterImage.Height;
        //        width = (int)(zoomScale * (float)WaterImage.Width);
        //        height = (int)((float)SourceImage.Height * floatScale);
        //    }

        //    if (width <= 0 && height < 0)
        //    {
        //        width = SourceImage.Width;
        //        height = SourceImage.Height;
        //    }
        //}
        #endregion

        #region 设置位置
        int IntX = 0;
        int IntY = 0;
        if (border < 0)
            border = 8;
        if (postion == 1)
        {
            IntX = border;
            IntY = border;
        }
        else if (postion == 2)
        {
            IntX = (SourceImage.Width - width) / 2;
            IntY = border;
        }
        else if (postion == 3)
        {
            IntX = (SourceImage.Width - width) - border;
            IntY = border;
        }
        else if (postion == 4)
        {
            IntX = border;
            IntY = (SourceImage.Height - height) / 2;
        }
        else if (postion == 5)
        {
            IntX = (SourceImage.Width - width) / 2;
            IntY = (SourceImage.Height - height) / 2;
        }
        else if (postion == 6)
        {
            IntX = (SourceImage.Width - width) - border;
            IntY = (SourceImage.Height - height) / 2;
        }
        else if (postion == 7)
        {
            IntX = border;
            IntY = (SourceImage.Height - height) - border;
        }
        else if (postion == 8)
        {
            IntX = (SourceImage.Width - width) / 2;
            IntY = (SourceImage.Height - height) - border;
        }
        else if (postion == 9)
        {
            IntX = (SourceImage.Width - width) - border;
            IntY = (SourceImage.Height - height) - border;
        }
        else
        {
            IntX = (SourceImage.Width - width) - 10;
            IntY = (SourceImage.Height - height) - 10;
        }
        #endregion

        float[][] nArray ={ new float[] {1, 0, 0, 0, 0},
        new float[] {0, 1, 0, 0, 0},
        new float[] {0, 0, 1, 0, 0},
        new float[] {0, 0, 0, opacity, 0},
        new float[] {0, 0, 0, 0, 1}};
        ColorMatrix matrix = new ColorMatrix(nArray);
        ImageAttributes attributes = new ImageAttributes();
        attributes.SetColorMatrix(matrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);

        //GImage.CompositingQuality = CompositingQuality.HighQuality;
        //GImage.DrawImage(WaterImage, new Rectangle(IntX, IntY, width, height), 0, 0, WaterImage.Width, WaterImage.Height, GraphicsUnit.Pixel, attributes);

        GImage.CompositingQuality = CompositingQuality.HighQuality;

         StringFormat drawFormat = new StringFormat();
         drawFormat.FormatFlags = StringFormatFlags.DirectionVertical;

         GImage.DrawString(waterString, drawFont, new SolidBrush(Color.Black), new Rectangle(IntX, IntY, width, height));

        ImageFormat ImgFormat = GetImageFormat(Path.GetExtension(sourceFile));
        SourceImage.Dispose();
        OutPut.Save(targetFile, ImgFormat);
        GImage.Dispose();
        OutPut.Dispose();
        //WaterImage.Dispose();

        if (deleteSource)
            File.Delete(sourceFile);

    }