淘宝短链接生成器（淘宝链接封面图多大）

这个东西我已经用了有段时间了，从开始写文章就在用这个，主要原因还是因为我比较懒。懒得去寻找图片，同时又怕万一惹来版权争议。。。

跟我所有的文章的封面图一样，一个纯色背景加上文字自动生成一个指定大小的图片。

代码实现也比较简单，如果有兴趣的话，可以自己扩展，比如自定义背景图，自定义水印等。

实现功能：

利用C做一个简单的封面图片生成器

开发环境：

开发工具： Visual Studio 2013

.NET Framework版本：4.5

实现代码：

privatevoidImg_Load(objectsender, EventArgs e){ init(); }privatevoidbtnBg_Click(objectsender, EventArgs e){ ColorDialog cd =newColorDialog();if(cd.ShowDialog() == DialogResult.OK) { panelBgColor.BackColor = cd.Color; } }privatevoidbtnFontColor1_Click(objectsender, EventArgs e){ ColorDialog cd =newColorDialog();if(cd.ShowDialog() == DialogResult.OK) { panelFontColor1.BackColor = cd.Color; } }privatevoidbtnFontColor2_Click(objectsender, EventArgs e){ ColorDialog cd =newColorDialog();if(cd.ShowDialog() == DialogResult.OK) { panelFontColor2.BackColor = cd.Color; } }privatevoidbtnFont_Click(objectsender, EventArgs e){ FontDialog fd =newFontDialog(); fd.Font = txtFont.Font;if(fd.ShowDialog() == DialogResult.OK) { txtFont.Font = fd.Font; } }privatevoidbtnPre_Click(objectsender, EventArgs e){if(string.IsNullOrWhiteSpace(txtWord.Text)) { MessageBox.Show("请先设置文字","提示");return; } MemoryStream stream =newMemoryStream(CreateIamge(txtWord.Text)); pictureBox1.Image = Image.FromStream(stream,true); }privatevoidbtnSave_Click(objectsender, EventArgs e){if(pictureBox1.Image ==null) { MessageBox.Show("请先预览","提示");return; } SaveFileDialog sfd =newSaveFileDialog(); sfd.SupportMultiDottedExtensions =true; sfd.Filter ="PNG格式|*.png|JPG格式|*.jpg"; sfd.AddExtension =true;if(sfd.ShowDialog() == DialogResult.OK) { EncoderParameters myEncoderParameters =newEncoderParameters(1); myEncoderParameters.Param[0] =newEncoderParameter(Encoder.Quality,100L); pictureBox1.Image.Save(sfd.FileName, GetEncoderInfo("image/png"), myEncoderParameters); } }privatevoidinit(){ Font font =newFont("华文行楷",36, FontStyle.Bold); txtFont.Font = font; panelFontColor1.BackColor = ColorTranslator.FromHtml("ff0080ff"); panelFontColor2.BackColor = ColorTranslator.FromHtml("ffff80c0"); }publicbyte[]CreateIamge(stringstr){intw = Convert.ToInt32(txtWidth.Text);inth = Convert.ToInt32(txtHeight.Text);//渐变画笔LinearGradientBrush brush =newLinearGradientBrush(newRectangle(0,0, w, h), panelFontColor1.BackColor, panelFontColor2.BackColor,25f,true); Bitmap image =newBitmap(w, h); Graphics g = Graphics.FromImage(image);//设置高质量插值法g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;//设置高质量,低速度呈现平滑程度g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;//消除锯齿g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;//填充背景色g.FillRectangle(newSolidBrush(panelBgColor.BackColor),newRectangle(0,0, w, h));//设置文本呈现方式g.TextRenderingHint = TextRenderingHint.ClearTypeGridFit;//获取文字大小SizeF sf = g.MeasureString(str, txtFont.Font); g.DrawString(str, txtFont.Font, brush, (w - sf.Width) /2, (h - sf.Height) /2); MemoryStream stream =newMemoryStream();//高质量保存EncoderParameters myEncoderParameters =newEncoderParameters(1); myEncoderParameters.Param[0] =newEncoderParameter(Encoder.Quality,100L); image.Save(stream, GetEncoderInfo("image/png"), myEncoderParameters);byte[] buffer = stream.ToArray(); g.Dispose(); image.Dispose();returnbuffer; }privatestaticImageCodecInfoGetEncoderInfo(String mimeType){intj; ImageCodecInfo[] encoders; encoders = ImageCodecInfo.GetImageEncoders();for(j =0; j < encoders.Length; ++j) {if(encoders[j].MimeType == mimeType)returnencoders[j]; }returnnull; }

实现效果：

由简入繁，拿来即用

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