author | Dominic Pinkman <dominic.pinkman@nokia.com> |
Tue, 20 Jul 2010 12:00:49 +0100 | |
changeset 13 | 48780e181b38 |
parent 8 | ae94777fff8f |
permissions | -rw-r--r-- |
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ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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<?xml version="1.0" encoding="utf-8"?> |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
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<!-- This component and the accompanying materials are made available under the terms of the License |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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"Eclipse Public License v1.0" which accompanies this distribution, |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
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<!-- Initial Contributors: |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
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Nokia Corporation - initial contribution. |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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Contributors: |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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--> |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
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<!DOCTYPE concept |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
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<concept xml:lang="en" id="GUID-A5693758-495B-598E-A514-24C48D459BB6"><title>Drawing Arcs and Ellipses</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>This topic provides examples that demonstrate how to draw ellipses and arcs. The first draws the whole ellipse; the second, one section of the ellipse; and in the third, the other section of the ellipse is drawn (also illustrating construction lines and points). It also shows how to draw two pie slices making an ellipse. </p> <p>The code assumes that the ellipse and arc examples all use a common pre-defined rectangle: </p> <codeblock id="GUID-E2CBAA84-72BA-5E97-97F9-52AEB00C6E5C" xml:space="preserve">... |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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TRect ellipseRect=Rect(); // for arcs and ellipse |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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ellipseRect.Shrink(10,10); // set size so inside the border rectangle |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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...</codeblock> <p>The arc and pie slice examples use two construction points as arguments: </p> <codeblock id="GUID-A701FA54-8AB4-5622-9DCC-4BF6B55C8C8F" xml:space="preserve">... |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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TPoint screenCenterPoint=rect.Center(); // the center of the screen |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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|
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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// set up a pair of construction points for arc and pie slice drawing |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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TPoint constructionPoint1(15,15); // outside the construction ellipse |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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TPoint constructionPoint2(200,150); // inside the construction ellipse |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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...</codeblock> <p>The center point is drawn in the second arc example to clarify arc construction. </p> <section><title>How to draw an ellipse</title> <p>You can use <codeph>DrawEllipse()</codeph> to draw an ellipse. </p> <codeblock id="GUID-076DE9D4-9F7F-56E7-8A13-AA546C8672E2" xml:space="preserve">... |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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// draw an ellipse centered in the rectangle |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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gc.DrawEllipse(ellipseRect); |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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...</codeblock> </section> <section><title>How to draw an arc</title> <p>An arc is drawn as a portion of an ellipse. As well as the ellipse rectangle, the call must specify the two points: the first defines one end of a line from the geometric center of the ellipse; the point of intersection between this line and the ellipse defines the start point of the arc. The second specified point acts in the same way for the end of the arc. </p> <fig id="GUID-ED34ADD7-004F-5BE6-822F-B5592E4F1A9A"><title> |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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Arc construction |
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48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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</title> <image href="GUID-6A5D0445-5D53-5293-A501-136203C80BEE_d0e207299_href.png" placement="inline"/></fig> <p>The example code here shows how an arc is drawn in an anti-clockwise direction using <codeph>constructionPoint1</codeph> and <codeph>constructionPoint2</codeph> as the start to the end points. </p> <codeblock id="GUID-956A154F-EE60-5286-97BA-B05ABBA2C949" xml:space="preserve">... |
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ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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// draw an arc centered in the rectangle |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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gc.DrawArc(ellipseRect,constructionPoint1,constructionPoint2); |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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...</codeblock> <p>You can reverse the pair of construction point arguments to draw the other half of the ellipse. The construction points and screen center are also drawn, with dotted construction lines: </p> <codeblock id="GUID-CAB960B4-66DC-5996-9D2E-094B0171BFB5" xml:space="preserve">... |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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// draw an arc centered in the rectangle |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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// that is the other portion of the ellipse |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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gc.DrawArc(ellipseRect,constructionPoint2,constructionPoint1); |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
diff
changeset
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|
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
diff
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// draw construction lines and points |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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gc.SetPenStyle(CGraphicsContext::EDottedPen); |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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gc.MoveTo(constructionPoint1); |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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gc.DrawLineTo(screenCenterPoint); |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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gc.DrawLineTo(constructionPoint2); |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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gc.SetPenSize(penSizeBold); |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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gc.Plot(constructionPoint1); |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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gc.Plot(constructionPoint2); |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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gc.Plot(screenCenterPoint); |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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...</codeblock> </section> <section><title>Drawing pie slices</title> <p>The example code here shows how two pie slices are drawn. A pie slice is the area bounded by: </p> <p>an arc as used above </p> <p>the straight line from the start point from the geometric center of the ellipse </p> <p>the straight line from the end point from the geometric center of the ellipse </p> <fig id="GUID-71C67896-8B38-5D1E-B34A-0425CF135915"><title> |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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Pie slice construction |
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Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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</title> <image href="GUID-20B364FB-FC12-5EF1-B0EC-1A845693EFFD_d0e207340_href.png" placement="inline"/></fig> <p>Solid and patterned brush styles are used to fill the portions of the elliptical disc. </p> <ol id="GUID-8A734874-8E67-5ABF-9C65-308B136D25D4"><li id="GUID-31A563CE-3043-5713-9FBA-A42C6902F544"><p>Use <codeph>SetBrushStyle()</codeph> to set the brush style to solid. </p> </li> <li id="GUID-0F8D5C04-DD38-5B8A-9BAA-B2E9F9C53C1E"><p>Use <codeph>SetBrushColour()</codeph> to set the brush color to black. </p> </li> <li id="GUID-6EDBBFE4-640C-5E40-8AFE-8B0E99F843A3"><p>Use <codeph>DrawPie()</codeph> to draw a pie slice. </p> </li> <li id="GUID-5ADA6FF4-D9B8-5624-AE74-8C58FF06B624"><p>Use <codeph>SetBrushStyle()</codeph> to set the patterned brush style. </p> </li> <li id="GUID-FA09E650-1E1E-5565-8329-41490F77A974"><p>Use <codeph>DrawPie()</codeph> and reverse the pair of construction point arguments so that the two pie slices together form a whole ellipse. </p> </li> </ol> <codeblock id="GUID-79463D92-F260-52BD-BF5B-5917365E9C19" xml:space="preserve">... |
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ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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// draw a pie slice centered in the rectangle |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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gc.SetBrushStyle(CGraphicsContext::ESolidBrush); |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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gc.SetBrushColor(black); |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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gc.DrawPie(ellipseRect,constructionPoint1,constructionPoint2); |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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|
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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// draw the other portion of the elliptical disc |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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gc.SetBrushStyle(CGraphicsContext::EVerticalHatchBrush); |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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gc.DrawPie(ellipseRect,constructionPoint2,constructionPoint1); |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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...</codeblock> </section> </conbody><related-links><link href="GUID-55C8C429-1BEC-5A58-94EC-DA1E51F62867.dita"><linktext>Drawing |
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to a Graphics Context Tutorials</linktext> </link> <link href="GUID-E3AC8F3E-9D5C-5E7D-9760-023B77C7C8A8.dita"><linktext>Drawing and Graphics Contexts</linktext> </link> </related-links></concept> |