.NET/ASP.NET/C#/VB.NET PDF Document SDK

Another excellent resource is Ajax Patterns (ajaxpatternsorg), mentioned earlier Michael Mahemoff maintains Ajax Patterns, and although the updates may not be quite as frequent as Ajaxian, the site has impressive depth for such a new area Don t be dissuaded by the word Patterns in the title, the site has plenty of information on Ajax basics, frameworks, and common gotchas Ajax Matters (ajaxmatterscom/r/welcome) has a great collection of articles and books related to Ajax You ll find more than just references to the XMLHttpRequest object you ll find excellent resources on JavaScript and CSS as well Ajax Matters includes a blog, though it isn t updated frequently Another blog worth tracking is the appropriately named Ajax Blog (ajaxblogcom) This blog features a number of contributors and, as you would expect, covers a wide variety of topics in the Ajax space.

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Forms let myControls = [| (new Button() :> Control); (new TextBox() :> Control); (new Label() :> Control) |] An upcast also has the effect of automatically boxing any value type Value types are held in memory on the program stack, rather than on the managed heap Boxing means that the value is pushed onto the managed heap, so it can be passed around by reference The following example demonstrates a value being boxed: #light let boxedInt = (1 :> obj) A downcast changes a value s static type to one of its descendant types and thus recovers information hidden by an upcast Downcasting is dangerous since the compiler doesn t have any way to statically determine whether an instance of a type is compatible with one of its derived types This means you can get it wrong, and this will cause an invalid cast exception (System.

Panoramic photographs are made by merging many photographs together that have been taken while rotating a camera in one place. The camera used in this example is a Jazz Photo JDC-11, but many similar inexpensive digital cameras are available. You ll need to modify the holder and trigger design from the one shown in Figure 14-20 to suit the particular camera you have. The width of the camera field of view is about 50 degrees. It s important to allow plenty of overlap between images to make merging the photographs easier by only turning 35 degrees between photos. You also want to make sure that the pan is more than 360 degrees to allow some cropping on the ends.

InvalidCastException) to be issued at runtime Because of the inherent danger of downcasting, it is often preferred to replace it with pattern matching over NET types, as demonstrated in 3 Nevertheless, a downcast can be useful in some places, so a downcast operator, composed of a colon, question mark, and greater-than sign (: >), is available The next example demonstrates downcasting: #light open SystemWindowsForms let moreControls = [| (new Button() :> Control); (new TextBox() :> Control) |] let control = let temp = moreControls[0] tempText <- "Click Me!" temp.

Like Ajax Matters, it does a good job of discussing topics related to Ajax such as browser compatibility and tutorials Besides just using Google to search for information on Ajax, stopping by Google Labs (labsgooglecom) from time to time is advisable While not every application or feature Google Labs adds to its beta area is Ajax based, features such as Google Maps and Google Suggest certainly are primary reasons why Ajax is receiving so much attention these days Within a few days of Google deploying something really cool, chances are good someone will have it dissected It s worth keeping an eye on the good people at Adaptive Path (wwwadaptivepathcom) We owe the term Ajax to Jesse James Garrett, a founder of Adaptive Path; in addition, the company was a co-organizer, with O Reilly, of the Ajax Summit.

let button = let temp = (control : > Button) temp.DoubleClick.Add(fun e -> MessageBox.Show("Hello") |> ignore) temp It creates an array of two Windows control objects, upcasting them to their base class, Control. Then it binds the first control to the control identifier. It then downcasts this to its specific type, Button, before adding a handler to its DoubleClick event, an event not available on the Control class.

Figure 14-20. Panoramic camera mount The base of the RoboArm T-56 project from the original NXT kit has a turntable (see Figure 14-21) that makes a great platform for rotating a camera to take panoramic photographs, too. The turntable is geared down so much that it takes 168 full turns of the NXT motor for only one rotation of the turntable.