知识大全 C#中使用GDI 让网站新闻标题个性化

Posted 2022-07-17 知

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　　新华网上的今日头条的标题是用图片体现的这种头条我们一般的做法可能是使用Photoshop制作成图片保存上传这样需要浪费人力比较麻烦有没有更好的办法呢？

　　下面使用GDI+及C#代码完成自动实现的过程

　　老规矩先看看运行效果

　　下面是C#代码

　　// Text Image aspx// Text Image aspx csusing System; using System Data; using System Configuration; using System Collections; using System Web; using System Web Security; using System Web UI; using System Web UI WebControls; using System Web UI WebControls WebParts; using System Web UI HtmlControls; using System Drawing; using System Drawing Imaging; using System Drawing Drawing D; using System IO;

　　namespace BrawDraw Com Utilitypublic partial class Utility_Text Image : System Web UI Pageint _width = ; public int Widthgetreturn _width; set_width = value;

　　int _height = ; public int Heightgetreturn _height; set_height = value;

　　string _text = string Empty; public string Textgetreturn _text; set_text = value;

　　string _fontName = 宋体 ; public string FontNamegetreturn _fontName; set_fontName = value;

　　Color _fontColor = Color Black; public Color FontColorgetreturn _fontColor; set_fontColor = value;

　　Color _backgroundColor = Color White; public Color BackgroundColorgetreturn _backgroundColor; set_backgroundColor = value;

　　//华文新魏protected void Page_Load(object sender EventArgs e)if (Request QueryString[ w ] != null)trythis _width = int Parse(Request QueryString[ w ] Trim()); finally

　　if (Request QueryString[ h ] != null)trythis _height = int Parse(Request QueryString[ h ] Trim()); finally

　　if (Request QueryString[ text ] != null)this _text = Request QueryString[ text ] Trim(); else if (Request QueryString[ t ] != null)this _text = Request QueryString[ t ] Trim();

　　if (Request QueryString[ font ] != null)this _fontName = Request QueryString[ font ] Trim(); else if (Request QueryString[ f ] != null)this _fontName = Request QueryString[ f ] Trim(); if (this _fontName == 大黑 )this _fontName = 方正大黑简体 ; string colorString = Black ; if (Request QueryString[ color ] != null)colorString = Request QueryString[ color ] Trim(); else if (Request QueryString[ c ] != null)colorString = Request QueryString[ c ] Trim(); if (colorString StartsWith( _ ))colorString = # + colorString Remove( ); this _fontColor = ConvertColor(colorString);

　　string bgColorString = White ; if (Request QueryString[ bgcolor ] != null)bgColorString = Request QueryString[ bgcolor ] Trim(); else if (Request QueryString[ b ] != null)bgColorString = Request QueryString[ b ] Trim(); if (bgColorString StartsWith( _ ))bgColorString = # + bgColorString Remove( );

　　this _backgroundColor = ConvertColor(bgColorString);

　　if (!IsPostBack)CreateImage(this Text this Width this Height this FontName this FontColor this

　　BackgroundColor);

　　//根据验证字符串生成最终图象public void CreateImage(string text int width int height string fontName Color

　　fontColor Color backgroundColor)Bitmap theBitmap = new Bitmap(width height); Graphics theGraphics = Graphics FromImage(theBitmap); theGraphics InterpolationMode = System Drawing Drawing D InterpolationMode HighQualityBicubic; theGraphics CompositingQuality = System Drawing Drawing D CompositingQuality HighQuality; theGraphics SmoothingMode = System Drawing Drawing D SmoothingMode HighQuality; theGraphics TextRenderingHint = System Drawing Text TextRenderingHint AntiAlias; // 背景theGraphics Clear(backgroundColor);

　　GraphicsPath gp = new GraphicsPath(); FontFamily fontFamily; tryfontFamily = new FontFamily(fontName); catch (Exception exc)fontFamily = new FontFamily( 宋体 ); StringFormat format = new StringFormat(); format Alignment = StringAlignment Near; format LineAlignment = StringAlignment Center;

　　gp AddString(text fontFamily f new Point( ) format); RectangleF rectF = gp GetBounds(); float scaleX = width * f / rectF Width; float scaleY = height * f / rectF Height; float offsetX = rectF X * scaleX; float offsetY = rectF Y * scaleY; System Drawing Drawing D Matrix matrix = new Matrix(scaleX scaleY

　　 offsetX offsetY); gp Transform(matrix); Brush newBrush = new SolidBrush(fontColor); theGraphics FillPath(newBrush gp); //theGraphics DrawRectangle(Pens Black width height );

　　if (gp != null) gp Dispose();

　　// 将生成的图片发回客户端MemoryStream ms = new MemoryStream(); theBitmap Save(ms ImageFormat Png);

　　Response ClearContent(); //需要输出图象信息要修改HTTP头 Response ContentType = image/Png ; Response BinaryWrite(ms ToArray()); theGraphics Dispose(); theBitmap Dispose(); Response End();

　　private Color ConvertColor(string colorString)Array knownColors = System Enum GetValues(typeof(KnownColor)); foreach (object colorName in knownColors)if (colorString ToLower() == colorName ToString() ToLower())return Color FromName(colorString);

　　if (colorString StartsWith( # ))return ColorTranslator FromHtml(colorString);

　　tryint color argb = int Parse(colorString); return Color FromArgb(color argb); finally

　　return Color Black;

　　调用方法

　　BrawDraw Com在线生成个性化标题(其中text后面传入要显示的文字 w或width参数设置图片宽度 h或height设置图片高度 f或font设置字体 c或color设置标题的颜色 )

　　OK 大功告成

　　如果你是使用静态网页你可以使用Javascript方式嵌入

　　显示效果图

　　或许你的服务器上没有安装你设置的字体（关于如何取得服务器上已安装字体列表详见这篇）比如下面代码

　　正常的显示应该是这样

　　如果没有此字体显示出来的效果就是这样

　　原因在于我在下面代码中设置了没有该字体时则会执行至catch (Exception exc)块内

　　这里使用了一般带中文操作系统的服务器上都会自动安装的宋体字作为默认字体

　　tryfontFamily = new FontFamily(fontName); catch (Exception exc)fontFamily = new FontFamily( 宋体 );

还需要更完善？我想你可以使用Cache 以提高服务器的效率或者是如果你需要生成静态新闻页面那么你可以在生成静态页面前自动调用WebService将图片保存下来然后在静态页面中直接调用此新闻标题图片 cha138/Article/program/net/201311/12703