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our iPhone has the ability to determine where in the world it is using a framework called Core Location. There are actually three technologies that Core Location can leverage to do this: GPS, cell tower triangulation, and Wi-Fi Positioning Service (WPS). GPS is the most accurate of the three but is not available on first-generation iPhones. GPS reads microwave signals from multiple satellites to determine the current location. Cell tower triangulation determines the current location by doing a calculation based on the locations of the cell towers in the phone s range. Cell tower triangulation can be fairly accurate in cities and other areas with a high cell tower density but becomes less accurate in areas where there is a greater distance between towers. The last option, WPS, uses the IP address from iPhone s Wi-Fi connection to make a guess at your location by referencing a large database of known service providers and the areas they service. WPS is imprecise and can be off by many miles. All three methods put a noticeable drain on iPhone s battery, so keep that in mind when using Core Location. Your application shouldn t poll for location any more often than is absolutely necessary. When using Core Location, you have the option of specifying a desired accuracy. By carefully specifying the absolute minimum accuracy level you need, you can prevent unnecessary battery drain. The technologies that Core Location depends on are hidden from your application. We don t tell Core Location whether to use GPS, triangulation, or WPS.

<PropertyGroup Condition= $(Configuration)|$(Platform) == Debug|AnyCPU > <DebugSymbols>true</DebugSymbols> <DebugType>full</DebugType> <Optimize>false</Optimize> <OutputPath>\inetpub\wwwroot\bin\</OutputPath> <DefineConstants>DEBUG;TRACE</DefineConstants> <ErrorReport>prompt</ErrorReport> <WarningLevel>4</WarningLevel> </PropertyGroup> <PropertyGroup Condition= $(Configuration)|$(Platform) == Release|AnyCPU > <DebugType>pdbonly</DebugType> <Optimize>true</Optimize> <OutputPath>\inetpub\wwwroot\bin\</OutputPath> <DefineConstants>TRACE</DefineConstants> <ErrorReport>prompt</ErrorReport> <WarningLevel>4</WarningLevel> </PropertyGroup> <ItemGroup> <Reference Include= System /> <Reference Include= System.Data /> <Reference Include= System.Xml /> <Reference Include= System.Web /> <Reference Include= Microsoft.SharePoint /> </ItemGroup> <ItemGroup> <Compile Include= WebPart.cs /> <Compile Include= Properties\AssemblyInfo.cs /> </ItemGroup> <Import Project= $(MSBuildBinPath)\Microsoft.CSHARP.Targets /> </Project>

[[OpenALSoundController sharedSoundController] setDopplerFactor:1.0]; [[OpenALSoundController sharedSoundController] setSpeedOfSound:343.3];

We just tell it how accurate we would like it to be, and it will decide which technologies give it the best chance to fulfill your request.

As it turns out, I like how all our default values work for this instructional example. I think these values are strong enough that you can easily notice the Doppler effect being applied, but not too strong that everything becomes incomprehensible. But I encourage you to play with these parameters to see how they manipulate the effect.

The provider needs to keep track of the parameters a consumer is interested in. To be able to do this, we add a property called Parameters to the provider. The implementation of the property holding the list of property descriptors that the consumer is interested in is shown in the next code fragment: private PropertyDescriptorCollection _objParameters; public PropertyDescriptorCollection Parameters { get { return _objParameters; } set { _objParameters = value; } } A parameters provider web part always needs to implement a SetConsumerSchema() method that allows a consumer to express its interest in a set of parameters provided by the provider. The implementation of this method is shown in the next code fragment: public void SetConsumerSchema( System.ComponentModel.PropertyDescriptorCollection schema) { Parameters = schema; } Every parameters provider web part needs to implement a method called GetParametersData(). This method will contain a reference to the parameters consumer web part after a connection is made. This allows the provider to communicate with the consumer. The GetParametersData() method needs to check the Parameters property to determine that the set of parameters it returns to the consumer is indeed of interest to the consumer. If a parameter needs to be returned to the client, it is added to a state bag object. The next code fragment shows the implementation for the GetParametersData() method. public void GetParametersData(ParametersCallback callback) { StateBag objParameters = new StateBag(); foreach (PropertyDescriptor objProperty in Parameters) { switch (objProperty.Name) { case ColumnA : objParameters.Add( ColumnA , ColumnA); break; case ColumnB : objParameters.Add( ColumnB , ColumnB); break; default: throw new Exception( ParametersProvider: Unknown parameter name ); } } callback.Invoke(objParameters); } This concludes the implementation for the parameters provider web part. The complete code can be found in Listing 5-17.

The Core Location API is actually fairly easy to work with. The main class we ll work with is CLLocationManager, usually referred to as the Location Manager. In order to interact with Core Location, we need to create an instance of the Location Manager, like this:

I saved this effect for last because I wanted to make sure you could clearly hear all the effects we applied in the prior steps. Distance attenuation is simply making sounds become more silent as they move farther away. It is a big-sounding phrase for a very simple concept.