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This function returns a formatted <div> tag. Its use is rather straightforward and basic, given that <div> tags are meant to be wrappers for HTML styles and layout or placeholders for JavaScript actions. div( class[string], text[string], attributes[array], escape[bool] ) class = null: The name of the class attribute for the tag. text = null: The text to appear inside the <div> element. attributes: Contains any HTML attributes to be included in the tag; arranged as keys named for the attribute and values to be assigned to the attribute. escape = false: If set to true, the contents of the text parameter will be escaped for HTML. Say I wanted to create a uniquely designed tab or page element to be displayed as a <div> element. The $html->div() function could be used thusly: < =$html->div('tab','Home'); > to output the following: <div class="tab">Home</div> If a passed variable contained the contents of the <div> tag, I could easily display the variable with slightly less code than if I were to use only HTML markup. The div() function as follows: < =$html->div('story',$story['Story']['contents']); > uses a few less characters than does this: <div class="story">< =$story['Story']['contents']; ></div> This function is generally used as a convenience wrapper for displaying <div> tags and allows you to stick with PHP instead of HTML if you choose.

When you render an image, you can also choose the format you want to use. JPEG offers the best color support and graphics, although it uses compression that can lose detail and make text look fuzzy. GIF (the standard used in the examples so far) is often a better choice for graphics containing text, but it doesn t offer good support for color. In .NET, every GIF uses a fixed palette with 256 generic colors. If you use a color that doesn t map to one of these presets, the color will be dithered, leading to a less-than-optimal graphic. However, the best format choice is PNG. PNG is an all-purpose format that always provides high quality by combining the lossless compression of GIFs with the rich color support of JPEGs. Unfortunately, browsers such as Internet Explorer often don t handle it correctly when you

return PNG content directly from a page Instead of seeing the picture content, you ll receive a message prompting you to download the picture content and open it in another program To sidestep this problem, you need to use the <img> tag approach shown in the previous example You need to be aware of two more quirks when using PNG First, some older browsers (including Netscape 4x) don t support PNG Second, you can t use the BitmapSave() method shown in earlier examples If you do, an error will occur (Technically, the problem is the Save() method requires a seekable stream a stream where the position can be changed at will That s because NET needs to be able to move back and forth through the picture content while it s being generated) The solution is easy to implement, if a little awkward.

Instead of saving directly to Response OutputStream, you can create a SystemIOMemoryStream object, which represents an in-memory buffer of data The MemoryStream is always seekable, so you can save the image to this object Once you ve performed this step, you can easily copy the data from the MemoryStream to the ResponseOutputStream The only disadvantage is that this technique requires more memory because the complete rendered content of the graphic needs to be held in memory at once However, the graphics you use in web pages generally aren t that large, so you probably won t observe any reduction in performance To implement this solution, start by importing the SystemIO namespace: Imports SystemIO Now you can replace the previous example with this modified code that saves the image in PNG format The changed lines are highlighted ' Get the user name If Request.

Figure 13-3. The Calendar plugin using the View action to render a calendar for January, 2025

QueryString("Name") Is Nothing Then ' No name was supplied ' Don't display anything Else Dim name As String = RequestQueryString("Name") ' Create an in-memory bitmap where you will draw the image Dim image As New Bitmap(300, 50) ' Get the graphics context for the bitmap Dim g As Graphics = GraphicsFromImage(image) gFillRectangle(BrushesLightYellow, 0, 0, 300, 50) gDrawRectangle(PensRed, 0, 0, 299, 49) ' Draw some text based on the query string Dim font As New Font("Alba Super", 20, FontStyleRegular) gDrawString(name, font, BrushesBlue, 10, 0) ResponseContentType = "image/png".

' Create the PNG in memory. Dim mem As New MemoryStream() image.Save(mem, System.Drawing.Imaging.ImageFormat.Png) ' Write the MemoryStream data to the output stream. mem.WriteTo(Response.OutputStream) g.Dispose() image.Dispose() End If