添加动态文本图像

我现在有这被显示给用户的图像，我想根据传入的两个参数动态文本添加到该图像。添加动态文本图像

我的问题是，当我一步通过代码，它似乎都工作正常，但是当我在下面的代码运行后在屏幕上看到图像时，它没有文本。

下面的代码我的当前设置：

public ActionResult GenerateImage(string savingAmount, string savingDest) 
    { 
     // Hardcoding values for testing purposes. 
     savingAmount = "25,000.00"; 
     savingDest = "Canada"; 


     PointF firstLocation = new PointF(10f, 10f); 
     PointF secondLocation = new PointF(10f, 50f); 


     Image imgBackground = Image.FromFile(Server.MapPath("~/assets/img/fb-share.jpg")); 

     int phWidth = imgBackground.Width; int phHeight = imgBackground.Height; 

     Bitmap bmBackground = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb); 

     bmBackground.SetResolution(72, 72); 

     Graphics grBackground = Graphics.FromImage(bmBackground); 

     Bitmap bmWatermark; 
     Graphics grWatermark; 

     bmWatermark = new Bitmap(bmBackground); 
     bmWatermark.SetResolution(imgBackground.HorizontalResolution, imgBackground.VerticalResolution); 

     grWatermark = Graphics.FromImage(bmWatermark); 

     grBackground.SmoothingMode = SmoothingMode.AntiAlias; 

     // Now add the dynamic text to image 
     using (Graphics graphics = Graphics.FromImage(imgBackground)) 
     { 
      using (Font arialFont = new Font("Arial", 10)) 
      { 
       grWatermark.DrawString(savingAmount, arialFont, Brushes.White, firstLocation); 
       grWatermark.DrawString(savingDest, arialFont, Brushes.White, secondLocation); 
      } 
     } 

     imgBackground.Save(Response.OutputStream, ImageFormat.Png); 

     Response.ContentType = "image/png"; 

     Response.Flush(); 
     Response.End(); 


     return null; 

    }

如前所述运行此代码后，我便看到在浏览器但文本在图像上显示的图像，任何人都可以看到/提示什么可能导致这个问题？

来源

2016-03-17 Code Ratchet

乍一看，代码看起来不错;它可以是__browser refresh__问题吗？你能检查文件系统中的结果吗？另外：__did__在__purpose__上从'jpg'改为'png'，对不对？ – TaW

@David是对的，你应该使用两个Graphics对象！（一个没有被处理！） – TaW

我觉得在代码中有很多图像可以用来描述代码的意图。

加载图像
对映像创建图形
绘制成图形和密切
图像输出到客户端

在代码示例：你想应该减少这种什么您提供的是在imgBackground上打开图形，然后绘制到之前打开的grWatermark图形中，以避免再次触摸图像。

public ActionResult GenerateImage(string savingAmount, string savingDest) 
{ 
    // Hardcoding values for testing purposes. 
    savingAmount = "25,000.00"; 
    savingDest = "Canada"; 

    PointF firstLocation = new PointF(10f, 10f); 
    PointF secondLocation = new PointF(10f, 50f); 

    Image imgBackground = Image.FromFile(Server.MapPath("~/assets/img/fb-share.jpg")); 
    using (Graphics graphics = Graphics.FromImage(imgBackground)) 
    { 
     using (Font arialFont = new Font("Arial", 10)) 
     { 
      graphics.DrawString(savingAmount, arialFont, Brushes.White, firstLocation); 
      graphics.DrawString(savingDest, arialFont, Brushes.White, secondLocation); 
     } 
    } 

    imgBackground.Save(Response.OutputStream, ImageFormat.Png); 

    Response.ContentType = "image/png"; 

    Response.Flush(); 
    Response.End(); 

    return null; 
}

来源

2016-03-17 06:33:26

添加动态文本图像

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