1 <?xml version="1.0" encoding="utf-8"?>

     2 <!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->

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     4 "Eclipse Public License v1.0" which accompanies this distribution, 

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     7     Nokia Corporation - initial contribution.

     8 Contributors: 

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    10 <!DOCTYPE concept

    11   PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

    12 <concept id="GUID-F6E83530-3F8E-5930-8C6C-4D58B675E67A" xml:lang="en"><title>Digitizer

    13 Driver Technology</title><shortdesc>Describes how screen coordinates work with the Digitizer Driver.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

    14 <p>The digitizer hardware provides coordinate values that are digitized raw

    15 voltage values. These values are not the same as screen coordinates, which

    16 are based on pixel positions. The digitizer converts the raw values into screen

    17 coordinates and vice-versa. </p>

    18 <p>Screen coordinates always have their origin at the top left hand corner

    19 of the screen, but the digitizer has no such constraint - its origin, orientation

    20 and scaling are generally different from the screen coordinate system. This

    21 means that the digitizer needs to be calibrated so that digitizer coordinates

    22 can be translated to screen coordinates. </p>

    23 </conbody></concept>