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Let s take a look at the touch methods. First, in touchesBegan:withEvent:, we determine the point that the user is currently touching and store that value in lastPreviousPoint and lastCurrentPoint. Since this method is called when a gesture begins, we know there is no previous point to worry about, so we store the current point in both. We also reset the running line length count to 0. Then, in touchesMoved:withEvent:, we calculate the angle between the line from the current touch s previous position to its current position, and the line between the two points stored in the lastPreviousPoint and lastCurrentPoint instance variables. Once we have that angle, we check to see if it falls within our range of acceptable angles and check to make sure that the user s finger has traveled far enough before making that sharp turn. If both of those are true, we set the label to show that we ve identified a checkmark gesture. Next, we calculate the distance between the touch s position and its previous position, add that to lineLengthSoFar, and replace the values in lastPreviousPoint and lastCurrentPoint with the two points from the current touch so we ll have them next time through this method. Compile and run, and try out the gesture. When defining new gestures for your own applications, make sure you test them thoroughly, and if you can, have other people test them for you as well. You want to make sure that your gesture is easy for the user to do, but not so easy that it gets triggered unintentionally. You also need to make sure that you don t conflict with other gestures used in your application. A single gesture should not count, for example, as both a custom gesture and a pinch.

Listing 1-12. WebPartLibrary. vstemplate <VSTemplate Version= 2.0.0 Type= Project xmlns= http://schemas.microsoft.com/developer/vstemplate/2005 > <TemplateData> <Name>WebPart Library Project</Name> <Description>WebPart class library project </Description> <Icon Package= {FAE04EC1-301F-11d3-BF4B-00C04F79EFBC} ID= 4547 /> <ProjectType>CSharp</ProjectType> <SortOrder>20</SortOrder> <CreateNewFolder>false</CreateNewFolder> <DefaultName>ClassLibrary</DefaultName> <ProvideDefaultName>true</ProvideDefaultName> </TemplateData> <TemplateContent> <Project File= WebPartLibrary.csproj ReplaceParameters= true > <ProjectItem ReplaceParameters= true >Properties\AssemblyInfo.cs</ProjectItem> <ProjectItem ReplaceParameters= true >WebPart.cs</ProjectItem> </Project> </TemplateContent> <WizardExtension> <Assembly> Microsoft.Practices.RecipeFramework.VisualStudio, Version=1.0.60429.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a </Assembly> <FullClassName> Microsoft.Practices.RecipeFramework.VisualStudio.Templates.UnfoldTemplate </FullClassName> </WizardExtension> </VSTemplate> This XML is called a solution template. Solution templates are launched via the New command on the File menu.

- (void) setDopplerFactor:(ALfloat)doppler_factor { alDopplerFactor(doppler_factor); } - (ALfloat) dopplerFactor { return alGetFloat(AL_DOPPLER_FACTOR); } - (void) setSpeedOfSound:(ALfloat)speed_of_sound { alSpeedOfSound(speed_of_sound); } - (ALfloat) speedOfSound { return alGetFloat(AL_SPEED_OF_SOUND); }

Gar on Check, Please!

In OpenALSoundController.h, declare the interfaces or properties so they can be used publicly without warnings. No synthesize is necessary, since we explicitly implemented them.

The next file in the package is the WebPartLibrary.csproj file. This is a project template that contains a project description. The template creates (or unfolds) a new project in an existing solution. The project template will include references to other assemblies and will be responsible for creating any class files, the project file (.csproj), and the assembly.info file. The XML in Listing 1-13 needs to be added to the project template (WebPartLibrary.csproj) and contains code that can be used to create the web part library project: Listing 1-13. The Project Template <Project DefaultTargets= Build xmlns= http://schemas.microsoft.com/developer/msbuild/2003 > <PropertyGroup> <Configuration Condition= $(Configuration) == >Debug</Configuration> <Platform Condition= $(Platform) == >AnyCPU</Platform> <ProductVersion>8.0.30703</ProductVersion> <SchemaVersion>2.0</SchemaVersion> <ProjectGuid>$guid1$</ProjectGuid> <OutputType>Library</OutputType> <AppDesignerFolder>Properties</AppDesignerFolder> <RootNamespace>$safeprojectname$</RootNamespace> <AssemblyName>$safeprojectname$</AssemblyName> </PropertyGroup>

Well, you should now understand the mechanism the iPhone uses to tell your application about touches, taps, and gestures. You also know how to detect the most commonly used iPhone gestures and even got a taste of how you might go about defining your own custom gestures. The iPhone s interface relies on gestures for much of its ease of use, so you ll want to have these techniques at the ready for most of your iPhone development. When you re ready to move on, turn the page, and we ll tell you how to figure out where in the world you are using Core Location.

@property(nonatomic, assign) ALfloat dopplerFactor; @property(nonatomic, assign) ALfloat speedOfSound;

Finally, let s use our accessors in BBSceneController.m s init method after setDistanceModel. To start with, we will set the Doppler factor to 1.0 and the speed of sound to 343.3, which are the OpenAL defaults: