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Let s write a simple Pygame script to display all the events that are generated. Listing 3-2 uses pygame.event.wait() to wait for a single event. As soon as it gets one, it turns it into a string with str and adds it to a list. The rest of the code displays the new event along with as many previous events as it can fit on the screen. It uses the font module to display text (which we will discuss later).

<configuration> <system.web> <httpHandlers> <add path="hello.aspx" verb="*" type="Strangelights.HttpHandlers.SimpleHandler" validate="true"/> </httpHandlers> </system.web> </configuration> Executing SimpleHandler produces the web page shown in Figure 8-11.

At first, this work area may seem counterproductive because of the increased noise level and perceived distractions. This is a common fear, but don t give in to it. Adjustment to the noise level is very quick (hours to a few days), and any perceived distractions will quickly disappear.

Tip If you change the fill color in Listing 3-2 to (0,0,0) and the color of the font to (0, 255, 0), it will look a

Figure 8-11. The resulting web page when the SimpleHandler is executed This technique is unsatisfactory for creating web pages because it requires that you mix HTML tags t into your F# code. It does have some advantages, though. You can use this technique to put together documents other than HTML documents; for example, you can use it to dynamically create images on the server. The following example shows an IHttpHandler that generates a JPEG image of a pie shape. The amount of pie shown is determined by the angle value that that is passed in on the query string. Making this example work requires that you add a reference to System.Drawing.dll: namespace Strangelights.HttpHandlers open System.Drawing open System.Drawing.Imaging open System.Web

Code reviews are a good thing. They provide a learning experience for all individuals involved and create consistency throughout the project. The issue with code reviews is that they take a significant amount of time and are often skipped in order to meet deadlines. Paired programming makes code reviews an everyday activity. In addition, when a development issue or uncertainty comes up, instead of a developer taking significant time trying to solve the problem on his own, his pair jumps in to give him ideas and support. This helps developers resolve their problem much more quickly. Lastly, with paired programming, developers have someone else to keep them focused on the task at hand keeping the system as simple as possible.

// a class that will render a picture for a http request type PictureHandler() = interface IHttpHandler with // tell the ASP.NET runtime if the handler can be reused member x.IsReusable = false // The method that will be called when processing a // HTTP request and render a picture member x.ProcessRequest(c : HttpContext) = // create a new bitmap let bitmap = new Bitmap(200, 200) // create a graphics object for the bitmap let graphics = Graphics.FromImage(bitmap) // a brush to provide the color let brush = new SolidBrush(Color.Red) // get the angle to draw let x = int(c.Request.QueryString.Get("angle")) // draw the pie to bitmap graphics.FillPie(brush, 10, 10, 180, 180, 0, x) // save the bitmap to the output stream bitmap.Save(c.Response.OutputStream, ImageFormat.Gif) Again, you still need to register this type in the web.config file; the required configuration looks like this: <configuration> <system.web> <httpHandlers> <add path="pic.aspx" verb="*" type="Strangelights.HttpHandlers.PictureHandler" validate="true"/> </httpHandlers> </system.web> </configuration> Executing this code produces the image in shown in Figure 8-12. In this case, I passed in an angle of 200.

little like Matrix-style code. You may have to use your imagination a little!

Figure 8-12. Using an IHttpHandler to dynamically generate a picture Although this is a great technique for spicing up web sites, but you should be careful when using it. Generating images can be processor intensive, especially if the images are large or complicated. This can lead to web sites that do not scale up to the required number of concurrent users; therefore, if you do use this technique, ensure you profile your code correctly.