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You can see that we ve defined a minimum angle of 50 degrees and a maximum angle of 135 degrees This is a pretty broad range, and depending on your needs, you might decide to restrict the angle We experimented a bit with this and found that our practice checkmark gestures fell into a fairly broad range, which is why we chose a relatively large tolerance here We were somewhat sloppy with our checkmark gestures, and so we expect that at least some of our users will be as well Next, we define an outlet to a label that we ll use to inform the user when we ve detected a checkmark gesture We also declare three variables, lastPreviousPoint, lastCurrentPoint, and lineLengthSoFar Each time we re notified of a touch, we re given the previous touch point and the current touch point Those two points define a line segment.

Another great resource is the Blogcast Repository (http://blogcastrepository.com). A blogcast is simply a recorded video and audio session that demonstrates, teaches, or informs on a specific subject. This site is full of useful blogcasts on many subjects including SMS. At the time of this writing, there were 28 blogcasts in the SMS section alone (http://blogcastrepository.com/blogcasts/ 37/sms/default.aspx). You will need to register in order to view the blogcasts. Registration is free, and is free of spam. Once registered, you can browse the blogcast catalog and view any blogcasts that you desire. It s a great learning resource, and a great resource to share what you have learned.

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The next touch adds another segment We store the previous touch s previous and current points in lastPreviousPoint and lastCurrentPoint, which gives us the previous line segment We can then compare that line segment to the current touch s line segment Comparing these two line segments can tell us if we re still drawing a single line or if there s a sharp enough angle between the two segments that we re actually drawing a checkmark Remember, every UITouch object knows its current position in the view, as well as its previous position in the view In order to compare angles, however, we need to know the line that the previous two points made, so we need to store the current and previous points from the last time the user touched the screen.

Figure 16-2. The Data Connection Wizard Enter the URL for your site, such as http://omega5/pm, and click the Next button. In the next dialog box, choose the option to customize an existing list, and select the Tasks list, as shown in Figure 16-3.

We ll use these two variables to store those two values each time this method gets called, so that we have the ability to compare the current line to the previous line and check the angle..

Even though you have the complete set of project files at your disposal, we think you ll get more out of the book if you create each project by hand instead of simply running the ver sion you downloaded. The biggest reason for this is the familiarity and expertise you ll gain in working with the various tools we use throughout the book if you roll your own projects. There s just no substitute for actually clicking and dragging out buttons and sliders and scrolling through source code to make changes as we move from one version of a program to another. That said, our first project is in the 02 Hello World folder. If you ll be creating your own proj ects, create a new 02 Hello World folder and follow along. Launch Xcode, which is located in /Developer/Applications. If this is your first time using Xcode, don t worry; we ll walk you through the process of creating a new project. If you re already an old hand, just skim ahead. When you first launch Xcode, you ll be presented with a welcome screen like the one shown in Figure 2 1. The welcome screen contains useful links to iPhone and Mac OS X technical documentation, tutorial videos, news, sample code, and lots more. All of this information is available on Apple s developer web site and within Xcode s documentation browser, so if you d rather not see this screen in the future, just uncheck the Show at Launch checkbox before closing it. If you feel like poking through the information here for a few minutes, by all means, go right ahead. When you re done, close the window, and we ll proceed.

AppDeploy.com (http://www.appdeploy.com) is the Internet resource to go to when you need to script or repackage an application for distribution. Among other points of interest at the site is a massive library of applications, sorted by application name and vendor name. For each application listed, you ll find a community-based thread discussing the best practices, links, scripts, and challenges met/overcome with working with the application in regard to installation scripting/repackaging.

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