--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/SDK/Source/GUID-64AC6F53-A9A5-46FD-BCC6-4A9BD8D4DB5C.dita	Wed Mar 31 11:11:55 2010 +0100
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+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License 
+"Eclipse Public License v1.0" which accompanies this distribution, 
+and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
+<!-- Initial Contributors:
+    Nokia Corporation - initial contribution.
+Contributors: 
+-->
+<!DOCTYPE task
+  PUBLIC "-//OASIS//DTD DITA Task//EN" "task.dtd">
+<task id="GUID-64AC6F53-A9A5-46FD-BCC6-4A9BD8D4DB5C" xml:lang="en"><title>Compensating
+Sensor Data for Display Orientation</title><shortdesc>You can use the sensor data compensator APIs to correct the display
+and device orientation data.</shortdesc><prolog><metadata><keywords/></metadata></prolog><taskbody>
+<prereq id="GUID-A7AAEFBD-92F7-4143-AF04-CB7604C63B12"><p>Before you begin
+using the sensor data compensator APIs, you must do the following:</p><ol>
+<li id="GUID-A2F385CE-1902-42DB-91F0-6359174BD31B"><p>Open a Sensor Channel
+for communication. For details, see <xref href="GUID-4B709839-8EEF-4AD2-9868-9AF0176B1E5B.dita#GUID-4B709839-8EEF-4AD2-9868-9AF0176B1E5B/GUID-30E6033F-E316-4BDB-AF22-2369463DF709">Using
+Sensor Channels APIs</xref></p></li>
+<li id="GUID-D7CC2C9C-ADA4-4C20-9F83-1D194778D1A9"><p>Implement the data listener
+interface. For details see, <xref href="GUID-BA0D9DA9-3B54-4964-A4D6-9ADA4DEB7231.dita">Receiving
+Data from Sensors</xref></p></li>
+<li id="GUID-34B18C12-F93C-4509-8E6F-4A0C2998ADB7"><p>Register as a listener
+with any of the sensor types using an instance of <parmname>CSensrvChannel</parmname>.</p></li>
+<li id="GUID-527FEDAB-FAF3-4A8B-BF58-D300C0DC04E8"><p>Ensure that the data
+received from the sensor channel is not already compensated using the <xref href="GUID-22DC917F-D833-3531-AB2D-A6E2D52EF844.dita#GUID-22DC917F-D833-3531-AB2D-A6E2D52EF844/GUID-1E9D960B-23C4-30DF-A184-7E978AC9AC1B"><apiname>CSensrvChannel::GetPropertyL()</apiname></xref> function,
+as shown in the following example:</p><codeblock xml:space="preserve">// 'iChannel' contains an open channel
+TSensrvProperty property;
+TRAPD( err, iChannel-&gt;GetPropertyL( KSensrvPropIdChannelDataCompensation, KSensrvItemIndexNone, property ) );
+if ( err == KErrNone &amp;&amp; property.PropertyType() == ESensrvIntProperty )
+     {
+     // Channel data is compensated, check the compensation type
+     TInt compensationType;
+     property.GetValue( compensationType );
+     // 'compensationType' contains now a value from TSensorCompensationType enumeration declared in sensordatacompensationtypes.h
+     }
+else
+     {
+     // Channel data is not compensated
+     }</codeblock><p>For more information, see <xref href="GUID-83630B57-D842-4B60-8AF0-D2965251DE29.dita">Retrieving
+channel properties</xref> .</p></li>
+</ol>           </prereq>
+<context id="GUID-02653FE0-162F-46A1-A4BC-7DD48350432B">       <p>The sensor
+data compensator APIs allows you to compensate sensor data values, based on:</p><ul>
+<li><p>Display Orientation, when the display is changed from portrait to landscape.</p></li>
+<li><p>Device Orientation, when the keyboard is opened, resulting in the display
+being set at an angle to the keyboard. For example, N97.</p></li>
+</ul>     </context>
+<steps id="GUID-4DD07DEC-6017-4237-BE46-1D69E5FBD744-GENID-1-8-1-9-1-1-6-1-5-1-4-1-3-3">
+<step id="GUID-9A69E5AD-E938-4092-A8C2-CB65C37C8962-GENID-1-8-1-9-1-1-6-1-5-1-4-1-3-3-1"><cmd>Create an instance
+of <parmname>CSensorDataCompensator</parmname>.</cmd>
+<stepxmp><codeblock xml:space="preserve">iCompensator = CSensorDataCompensator::NewL(TSensrvAccelerometerAxisData::KDataTypeId,ESensorCompensateDeviceAndUIOrientation);</codeblock></stepxmp>
+</step>
+<step id="GUID-AE833279-71EA-43FC-AB2E-E4CFAF277A02"><cmd>Use the <xref href="GUID-D32C68EB-AB82-3C2D-98F1-280401FD1763.dita#GUID-D32C68EB-AB82-3C2D-98F1-280401FD1763/GUID-A400CB98-7D89-323F-92A8-EE5D581BEFA4"><apiname>CSensorDataCompensator::Compensate()</apiname></xref> function
+to correct the sensor data received from the following channel types and related
+classes:</cmd>
+<info><table id="GUID-1726B6BF-D170-4769-8E98-21BA6318E95F">
+<tgroup cols="2"><colspec colname="col1"/><colspec colname="col2"/>
+<thead>
+<row>
+<entry>Sensor Channel Type</entry>
+<entry>Data Class</entry>
+</row>
+</thead>
+<tbody>
+<row>
+<entry>Accelerometer axis data</entry>
+<entry><codeph>TSensrvAccelerometerAxisData</codeph></entry>
+</row>
+<row>
+<entry>Magnetometer axis data</entry>
+<entry><codeph>TSensrvMagnetometerAxisData</codeph></entry>
+</row>
+<row>
+<entry>Accelerometer double-tap</entry>
+<entry><codeph>TSensrvTappingData</codeph></entry>
+</row>
+</tbody>
+</tgroup>
+</table></info>
+</step>
+</steps>
+<example><title>Example</title><p>The following example illustrates the usage
+of sensor data compensator APIs to correct axis data received from accelerometer
+sensor.</p><codeblock xml:space="preserve">#include &lt;sensordatacompensator.h&gt; // link against sensordatacompensator.lib
+
+void CMyClass::ConstructL()
+
+   {
+   // iSensorChannel already instantiated and registered
+   if ( !AlreadyCompensated() )
+          {
+          iCompensator = CSensorDataCompensator::NewL( 
+          TSensrvAccelerometerAxisData::KDataTypeId, 
+           ESensorCompensateDeviceAndUIOrientation );
+          }
+   }
+
+CMyClass::~CMyClass()
+
+   {
+   delete iCompensator;
+   }
+
+void CMyClass::DataReceived( CSensrvChannel&amp; aChannel,
+
+                            TInt /*aCount*/, 
+                            TInt /*aDataLost*/ )
+   {
+    
+   TPckgBuf  &lt;TSensrvAccelerometerAxisData&gt; dataBuf;
+   iSensorChannel -&gt; GetData( dataBuf );
+
+   if ( iCompensator )
+       {
+       if ( iCompensator-&gt;Compensate( dataBuf ) == KErrNone )
+           {
+           // Now use the compensated data.
+           }
+       }</codeblock></example>
+<postreq id="GUID-F834E8DF-C906-43E9-B49B-9B0ACB116E9B"><p>End the session
+with the sensor channel using the <xref href="GUID-22DC917F-D833-3531-AB2D-A6E2D52EF844.dita#GUID-22DC917F-D833-3531-AB2D-A6E2D52EF844/GUID-0B8F50A6-2CA1-316A-82AB-AA026005E810"><apiname>CSensrvChannel::CloseChannel()</apiname></xref> function.</p></postreq>
+</taskbody></task>
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