动态生成图片。类似验证码

liuleiyu121520 2011-03-23 01:00:58

HtmlTable table_House = new HtmlTable();
if (feild!=null)
{
table_House.Style.Add("width", "100%");
table_House.Style.Add("cellpadding", "0px");
table_House.Style.Add("cellpadding", "0px");
for (int i = 0; i < Fieldhouse.Length; i++)
{

HtmlTableRow tr = new HtmlTableRow();

HtmlTableCell tdName = new HtmlTableCell();
tdName.InnerText = Fieldhouse[i].fieldName;
tdName.Style.Add("text-align", "center");
tdName.Style.Add("width", "50%");
tdName.Style.Add("border-bottom", "solid 2px #E5E5E5");
tdName.Style.Add("border-right", "solid 2px #E5E5E5");
HtmlTableCell tdValue = new HtmlTableCell();
tdValue.InnerText = Fieldhouse[i].fieldValue;
tdValue.Style.Add("text-align", "center");
tdValue.Style.Add("width", "50%");
tdValue.Style.Add("border-bottom", "solid 2px #E5E5E5");
tr.Cells.Add(tdName);
tr.Cells.Add(tdValue);
table_House.Rows.Add(tr);

}
}
int heigth=feild.Length*20;
System.Drawing.Bitmap img = new System.Drawing.Bitmap(heigth, 790);
using (System.Drawing.Graphics g =System.Drawing.Graphics.FromImage(img))
{
g.Clear(System.Drawing.Color.White);

}

我动态生成了一个表格并且绑定了数据。也生成了一个图片。我想把这个表格写入到这个图片（img）中。并显示到页面上。哪位大哥能教教

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le616 2011-03-23

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1.动态的生成图片（生成xy坐标），可参考生成曲线图，饼图，柱状图。
参考
asp.net的生成曲线图的过程
2.使用第三方控件。WebChart ,ZedGraph
参考
WebChart
ZedGraph

liuleiyu121520 2011-03-23

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[Quote=引用 8 楼 le616 的回复:]
表格写入到这个图片（img）中？？？
还是图片显示在表格中。。。
[/Quote]
就是把表格的数据以及边框什么的都写入到动态生成的那个img中。然后显示在页面上

le616 2011-03-23

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表格写入到这个图片（img）中？？？
还是图片显示在表格中。。。

liuleiyu121520 2011-03-23

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那个field数组中有两个字段。就是要画到图片上是2列多行。行是根据数组的长度而定的

liuleiyu121520 2011-03-23

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[Quote=引用 1 楼 wxr0323 的回复:]
C# code
//定义图像的大小，生成图像的实例
Img = new Bitmap(100, 25);

g = Graphics.FromImage(Img);//从Img对象生成新的Graphics对象

g.Clear(Color.White);//背景设为白色

for (int i = 0; i < ……
[/Quote]
那个是数组。哪有substring方法

liuleiyu121520 2011-03-23

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大哥们。我要动态生成额。全部都要动态生成。麻烦教教小弟啦

子夜__ 2011-03-23

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[Quote=引用 3 楼 fengyarongaa 的回复:]

C# code
/// <summary>
/// 文字水印
/// </summary>
/// <param name="imgPath">服务器图片相对路径</param>
/// <param name="filename">保存文件名</param>
/// <param name="watermarkT……
[/Quote]
水印怎么都整上了。

ycproc 2011-03-23

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/// <summary>

        /// 文字水印

        /// </summary>

        /// <param name="imgPath">服务器图片相对路径</param>

        /// <param name="filename">保存文件名</param>

        /// <param name="watermarkText">水印文字</param>

        /// <param name="watermarkStatus">图片水印位置 0=不使用 1=左上 2=中上 3=右上 4=左中  9=右下</param>

        /// <param name="quality">附加水印图片质量,0-100</param>

        /// <param name="fontname">字体</param>

        /// <param name="fontsize">字体大小</param>

        public static void AddImageSignText(string imgPath, string filename, string watermarkText, int watermarkStatus, int quality, string fontname, int fontsize)

        {

            byte[] _ImageBytes = File.ReadAllBytes(HttpContext.Current.Server.MapPath(imgPath));

            Image img = Image.FromStream(new System.IO.MemoryStream(_ImageBytes));

            filename = HttpContext.Current.Server.MapPath(filename);



            Graphics g = Graphics.FromImage(img);

            Font drawFont = new Font(fontname, fontsize, FontStyle.Regular, GraphicsUnit.Pixel);

            SizeF crSize;

            crSize = g.MeasureString(watermarkText, drawFont);



            float xpos = 0;

            float ypos = 0;



            switch (watermarkStatus)

            {

                case 1:

                    xpos = (float)img.Width * (float).01;

                    ypos = (float)img.Height * (float).01;

                    break;

                case 2:

                    xpos = ((float)img.Width * (float).50) - (crSize.Width / 2);

                    ypos = (float)img.Height * (float).01;

                    break;

                case 3:

                    xpos = ((float)img.Width * (float).99) - crSize.Width;

                    ypos = (float)img.Height * (float).01;

                    break;

                case 4:

                    xpos = (float)img.Width * (float).01;

                    ypos = ((float)img.Height * (float).50) - (crSize.Height / 2);

                    break;

                case 5:

                    xpos = ((float)img.Width * (float).50) - (crSize.Width / 2);

                    ypos = ((float)img.Height * (float).50) - (crSize.Height / 2);

                    break;

                case 6:

                    xpos = ((float)img.Width * (float).99) - crSize.Width;

                    ypos = ((float)img.Height * (float).50) - (crSize.Height / 2);

                    break;

                case 7:

                    xpos = (float)img.Width * (float).01;

                    ypos = ((float)img.Height * (float).99) - crSize.Height;

                    break;

                case 8:

                    xpos = ((float)img.Width * (float).50) - (crSize.Width / 2);

                    ypos = ((float)img.Height * (float).99) - crSize.Height;

                    break;

                case 9:

                    xpos = ((float)img.Width * (float).99) - crSize.Width;

                    ypos = ((float)img.Height * (float).99) - crSize.Height;

                    break;

            }



            g.DrawString(watermarkText, drawFont, new SolidBrush(Color.White), xpos + 1, ypos + 1);

            g.DrawString(watermarkText, drawFont, new SolidBrush(Color.Black), xpos, ypos);



            ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();

            ImageCodecInfo ici = null;

            foreach (ImageCodecInfo codec in codecs)

            {

                if (codec.MimeType.IndexOf("jpeg") > -1)

                    ici = codec;

            }

            EncoderParameters encoderParams = new EncoderParameters();

            long[] qualityParam = new long[1];

            if (quality < 0 || quality > 100)

                quality = 80;



            qualityParam[0] = quality;



            EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qualityParam);

            encoderParams.Param[0] = encoderParam;



            if (ici != null)

                img.Save(filename, ici, encoderParams);

            else

                img.Save(filename);



            g.Dispose();

            img.Dispose();

        }

    }

ycproc 2011-03-23

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    public class ImageWaterMark

    {

        /// <summary>

        /// 图片水印

        /// </summary>

        /// <param name="imgPath">服务器图片相对路径</param>

        /// <param name="filename">保存文件名</param>

        /// <param name="watermarkFilename">水印文件相对路径</param>

        /// <param name="watermarkStatus">图片水印位置 0=不使用 1=左上 2=中上 3=右上 4=左中  9=右下</param>

        /// <param name="quality">附加水印图片质量,0-100</param>

        /// <param name="watermarkTransparency">水印的透明度 1--10 10为不透明</param>

        public static void AddImageSignPic(string imgPath, string filename, string watermarkFilename, int watermarkStatus, int quality, int watermarkTransparency)

        {

            byte[] _ImageBytes = File.ReadAllBytes(HttpContext.Current.Server.MapPath(imgPath));

            Image img = Image.FromStream(new System.IO.MemoryStream(_ImageBytes));

            filename = HttpContext.Current.Server.MapPath(filename);



            if (watermarkFilename.StartsWith("/") == false)

                watermarkFilename = "/" + watermarkFilename;

            watermarkFilename = HttpContext.Current.Server.MapPath(watermarkFilename);

            if (!File.Exists(watermarkFilename))

                return;

            Graphics g = Graphics.FromImage(img);

            //设置高质量插值法

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

            //设置高质量,低速度呈现平滑程度

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

            Image watermark = new Bitmap(watermarkFilename);



            if (watermark.Height >= img.Height || watermark.Width >= img.Width)

                return;



            ImageAttributes imageAttributes = new ImageAttributes();

            ColorMap colorMap = new ColorMap();



            colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);

            colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);

            ColorMap[] remapTable = { colorMap };



            imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);



            float transparency = 0.5F;

            if (watermarkTransparency >= 1 && watermarkTransparency <= 10)

                transparency = (watermarkTransparency / 10.0F);





            float[][] colorMatrixElements = {

												new float[] {1.0f,  0.0f,  0.0f,  0.0f, 0.0f},

												new float[] {0.0f,  1.0f,  0.0f,  0.0f, 0.0f},

												new float[] {0.0f,  0.0f,  1.0f,  0.0f, 0.0f},

												new float[] {0.0f,  0.0f,  0.0f,  transparency, 0.0f},

												new float[] {0.0f,  0.0f,  0.0f,  0.0f, 1.0f}

											};



            ColorMatrix colorMatrix = new ColorMatrix(colorMatrixElements);



            imageAttributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);



            int xpos = 0;

            int ypos = 0;



            switch (watermarkStatus)

            {

                case 1:

                    xpos = (int)(img.Width * (float).01);

                    ypos = (int)(img.Height * (float).01);

                    break;

                case 2:

                    xpos = (int)((img.Width * (float).50) - (watermark.Width / 2));

                    ypos = (int)(img.Height * (float).01);

                    break;

                case 3:

                    xpos = (int)((img.Width * (float).99) - (watermark.Width));

                    ypos = (int)(img.Height * (float).01);

                    break;

                case 4:

                    xpos = (int)(img.Width * (float).01);

                    ypos = (int)((img.Height * (float).50) - (watermark.Height / 2));

                    break;

                case 5:

                    xpos = (int)((img.Width * (float).50) - (watermark.Width / 2));

                    ypos = (int)((img.Height * (float).50) - (watermark.Height / 2));

                    break;

                case 6:

                    xpos = (int)((img.Width * (float).99) - (watermark.Width));

                    ypos = (int)((img.Height * (float).50) - (watermark.Height / 2));

                    break;

                case 7:

                    xpos = (int)(img.Width * (float).01);

                    ypos = (int)((img.Height * (float).99) - watermark.Height);

                    break;

                case 8:

                    xpos = (int)((img.Width * (float).50) - (watermark.Width / 2));

                    ypos = (int)((img.Height * (float).99) - watermark.Height);

                    break;

                case 9:

                    xpos = (int)((img.Width * (float).99) - (watermark.Width));

                    ypos = (int)((img.Height * (float).99) - watermark.Height);

                    break;

            }



            g.DrawImage(watermark, new Rectangle(xpos, ypos, watermark.Width, watermark.Height), 0, 0, watermark.Width, watermark.Height, GraphicsUnit.Pixel, imageAttributes);



            ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();

            ImageCodecInfo ici = null;

            foreach (ImageCodecInfo codec in codecs)

            {

                if (codec.MimeType.IndexOf("jpeg") > -1)

                    ici = codec;

            }

            EncoderParameters encoderParams = new EncoderParameters();

            long[] qualityParam = new long[1];

            if (quality < 0 || quality > 100)

                quality = 80;



            qualityParam[0] = quality;



            EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qualityParam);

            encoderParams.Param[0] = encoderParam;



            if (ici != null)

                img.Save(filename, ici, encoderParams);

            else

                img.Save(filename);



            g.Dispose();

            img.Dispose();

            watermark.Dispose();

            imageAttributes.Dispose();

        }

子夜__ 2011-03-23

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 //定义图像的大小，生成图像的实例

        Img = new Bitmap(100, 25);



        g = Graphics.FromImage(Img);//从Img对象生成新的Graphics对象  



        g.Clear(Color.White);//背景设为白色



        for (int i = 0; i < VNum.Length; i++)

        {

            int cindex = random.Next(7);

            int findex = random.Next(5);

            Font f = new System.Drawing.Font(fonts[findex], 14, System.Drawing.FontStyle.Bold);

            Brush b = new System.Drawing.SolidBrush(c[cindex]);

            int ii = 4;

         

            g.DrawString(VNum.Substring(i, 1), f, b, 3 + (i * 20), ii);

        }

        ms = new MemoryStream();//生成内存流对象

        Img.Save(ms, ImageFormat.Jpeg);//将此图像以jpg图像文件的格式保存到流中



        //回收资源

        g.Dispose();

        Img.Dispose();