ASP.NET Web PDF Document Viewer/Editor Control Library

Figure 14-21. Panoramic camera using T-56 base Pushing the camera shutter button requires running the motor forward only long enough to guarantee that the arm has made good contact with it. A short reversal is necessary to make sure the button is fully released. Then rotate the camera 35 degrees and wait a little while to make sure it isn t shaking to take the next photo. The NXT-G program is shown in Figure 14-22. If you are using the T-56 base, you ll need to rotate 16 full revolutions to get 35 degrees.

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It s worth keeping an eye on 37signals (www37signalscom), which is truly pushing the boundaries of the traditional Web applications..

#light open SystemWindowsForms let showForm (form : Form) = formShow() // PrintPreviewDialog is defined in the BCL and is // derived directly the Form class let myForm = new PrintPreviewDialog() showForm myForm When you try to compile the previous example, you will receive the following error: Progfs(11,10): error: FS0001: This expression has type PrintPreviewDialog but is here used with type Form One way to call a function with a rigid type annotation on a parameter is to use an explicit upcast at the place where the function is called in order to change the type to be the same as the type of the function s parameter.

You can use just about any photo-editing software to merge the 11 photos into one long panorama. For example, Figures 14-23 and 14-24 show how Microsoft Photo Editor was used. The first photo in the sequence is expanded to have ten times the left margin so that the other photos can be simply cut and pasted into place.

The following line of code changes the type of myForm to be the same as the type of the parameter of showForm: showForm (myForm :> Form) Although upcasting the argument to showForm is a solution, it s not a very pretty one, because it means littering client code with upcasts So, F# provides another type annotation, the derived type annotation, in which the type name is prefixed with a hash sign This has the effect of constraining an identifier to be of a type or any of its derived types This means you can rewrite the previous example as shown next to remove the need for explicit upcasts in calling code I think this is a huge benefit to anyone using the functions you define #light let showFormRevised (form : #Form) = form.

1. The authors have indeed done this and can verify it takes longer to actually download all the components than to get an application running. One author was told about a project that took four months using the latest in the lightweight Java stack that was rewritten with Ruby on Rails in four evenings (not days, evenings).

An example of a full 360-degree panorama is shown in Figure 14-25.

Show() // ThreadExceptionDialog is define in the BCL and is // directly derived type of the Form class let anotherForm = new ThreadExceptionDialog(new Exception()) showFormRevised anotherForm You can use this kind of type annotation to tidy up code that uses a lot of casting For example, as shown in the Casting section earlier in this chapter, a lot of casting is often needed when creating a collection with a common base type, and this can leave code looking a little bulkier than it should A good way to remove this repeated casting, as with any commonly repeated section of code, is to define a function that does it for you:.

Articles and tutorials continue to pop up weekly if not daily. While following some of the sites already listed will tip you off to most if not all of these works, it s worthwhile to peruse O Reilly (www.oreilly.com) and the Apple Developer Connection (developer.apple.com). Both sites have been used as resources for this book and provide timely information on a range of Ajax topics.

#light let myControls = [| (new Button() :> Control); (new TextBox() :> Control); (new Label() :> Control) |] let uc (c : #Control) = c :> Control let myConciseControls = [| uc (new Button()); uc (new TextBox()); uc (new Label()) |] This example shows two arrays of controls being defined. The first, myControls, explicitly upcasts every control; the second, myConciseControls, delegates this job to a function. Also, given that the bigger the array, the bigger the savings and that it is quite common for these arrays to get quite big when working with WinForms, this is a good technique to adopt.