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Symbian3/PDK/Source/GUID-E3AC8F3E-9D5C-5E7D-9760-023B77C7C8A8.dita
author Dominic Pinkman <Dominic.Pinkman@Nokia.com>
Fri, 22 Jan 2010 18:26:19 +0000
changeset 1 25a17d01db0c
child 3 46218c8b8afa
permissions -rw-r--r--
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
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25a17d01db0c Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License
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"Eclipse Public License v1.0" which accompanies this distribution,
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors:
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-E3AC8F3E-9D5C-5E7D-9760-023B77C7C8A8" xml:lang="en"><title>Drawing and Graphics Contexts</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>The GDI API provides functions for drawing and filling various shapes (points, lines, polylines, arcs, rectangles, polygons, ellipses, rounded rectangles and pie slices), for drawing text, and for drawing bitmaps. Each drawing operation has a number of settings that affect its function—pen style, fill style, typeface, etc. Instead of passing these settings as parameters to every drawing function, the GDI API has the concept of a <b>graphics context</b> (<b>GC</b>) in which drawing functions are performed. The <codeph>CGraphicsContext</codeph> class is used to hold these settings and to provide all of the graphics functionality. </p> <p>The normal way of performing a drawing operation is therefore: </p> <ol id="GUID-B0F3020B-15C8-5A1E-AA44-9F2CB48A47A2"><li id="GUID-FC43F3A2-AD58-5F89-AD1B-82779741E965"><p>Set up a graphics context to hold the settings. </p> </li> <li id="GUID-0362DF4A-587A-587B-B4CB-689AF11E133D"><p>Call the graphics function of that context to perform the operation. </p> </li> </ol> <p>Graphics contexts are provided by graphics device objects that represents the medium being drawn to. The abstract base class for graphics device objects is <codeph>CGraphicsDevice</codeph>. </p> </conbody><related-links><link href="GUID-1C3455BE-2082-504D-9157-88D8C72B1B80.dita"><linktext>Graphics Device Interface
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  Concepts</linktext> </link> </related-links></concept>
MCL/sftools/depl/docscontent