https://www.techotopia.com/index.php?action=history&feed=atom&title=Drawing_iPhone_2D_Graphics_with_Quartz Drawing iPhone 2D Graphics with Quartz - Revision history 2026-05-12T14:32:46Z Revision history for this page on the wiki MediaWiki 1.26.2 https://www.techotopia.com/index.php?title=Drawing_iPhone_2D_Graphics_with_Quartz&diff=30033&oldid=prev Neil: Text replacement - "<table border="0" cellspacing="0">" to "<table border="0" cellspacing="0" width="100%">" 2016-10-27T19:59:53Z <p>Text replacement - &quot;&lt;table border=&quot;0&quot; cellspacing=&quot;0&quot;&gt;&quot; to &quot;&lt;table border=&quot;0&quot; cellspacing=&quot;0&quot; width=&quot;100%&quot;&gt;&quot;</p> <table class='diff diff-contentalign-left'> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr style='vertical-align: top;' lang='en'> <td colspan='2' style="background-color: white; color:black; text-align: center;">← Older revision</td> <td colspan='2' style="background-color: white; 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border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>&lt;tr&gt;</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>&lt;td width=&quot;20%&quot;&gt;[[Detecting iPhone Touch Screen Gesture Motions|Previous]]&lt;td align=&quot;center&quot;&gt;[[iPhone App Development Essentials|Table of Contents]]&lt;td width=&quot;20%&quot; align=&quot;right&quot;&gt;[[An iPhone Graphics Drawing Tutorial using Quartz 2D|Next]]&lt;/td&gt;</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>&lt;td width=&quot;20%&quot;&gt;[[Detecting iPhone Touch Screen Gesture Motions|Previous]]&lt;td align=&quot;center&quot;&gt;[[iPhone App Development Essentials|Table of Contents]]&lt;td width=&quot;20%&quot; 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font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>&lt;<del class="diffchange diffchange-inline">google</del>&gt;<del class="diffchange diffchange-inline">BUY_IOS3_BOTTOM</del>&lt;/<del class="diffchange diffchange-inline">google</del>&gt;</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>&lt;<ins class="diffchange diffchange-inline">htmlet</ins>&gt;<ins class="diffchange diffchange-inline">ios9_upgrade</ins>&lt;/<ins class="diffchange diffchange-inline">htmlet</ins>&gt;</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; 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font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>&lt;<ins class="diffchange diffchange-inline">htmlet</ins>&gt;<ins class="diffchange diffchange-inline">ios9_upgrade</ins>&lt;/<ins class="diffchange diffchange-inline">htmlet</ins>&gt;</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr> </table> Neil https://www.techotopia.com/index.php?title=Drawing_iPhone_2D_Graphics_with_Quartz&diff=20615&oldid=prev Neil: Text replacement - "<google>ADSDAQBOX_FLOW</google>" to "<htmlet>adsdaqbox_flow</htmlet>" 2016-02-01T18:05:07Z <p>Text replacement - &quot;&lt;google&gt;ADSDAQBOX_FLOW&lt;/google&gt;&quot; to &quot;&lt;htmlet&gt;adsdaqbox_flow&lt;/htmlet&gt;&quot;</p> <table class='diff diff-contentalign-left'> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr style='vertical-align: top;' lang='en'> <td colspan='2' style="background-color: white; color:black; text-align: center;">← Older revision</td> <td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 18:05, 1 February 2016</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l26" >Line 26:</td> <td colspan="2" class="diff-lineno">Line 26:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Points, Coordinates and Pixels ==</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Points, Coordinates and Pixels ==</div></td></tr> <tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>&lt;<del class="diffchange diffchange-inline">google</del>&gt;<del class="diffchange diffchange-inline">ADSDAQBOX_FLOW</del>&lt;/<del class="diffchange diffchange-inline">google</del>&gt;</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>&lt;<ins class="diffchange diffchange-inline">htmlet</ins>&gt;<ins class="diffchange diffchange-inline">adsdaqbox_flow</ins>&lt;/<ins class="diffchange diffchange-inline">htmlet</ins>&gt;</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The Quartz 2D API functions work on the basis of points. These are essentially the x and y coordinates of a two dimensional coordinate system on the device screen with 0, 0 representing the top left hand corner of the display. These coordinates are stored in the form of CGFloat variables. &#160;</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The Quartz 2D API functions work on the basis of points. These are essentially the x and y coordinates of a two dimensional coordinate system on the device screen with 0, 0 representing the top left hand corner of the display. These coordinates are stored in the form of CGFloat variables. &#160;</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr> </table> Neil  
The ability to draw two dimensional graphics on the iPhone is provided as part of the Core Graphics Framework in the form of the Quartz 2D API. Quartz on the iPhone is the same implementation as that provided with Mac OS X and provides a set of C functions designed to enable the drawing of 2D graphics in the form of images, lines and shapes together with range of fill patterns and gradients.
 
The ability to draw two dimensional graphics on the iPhone is provided as part of the Core Graphics Framework in the form of the Quartz 2D API. Quartz on the iPhone is the same implementation as that provided with Mac OS X and provides a set of C functions designed to enable the drawing of 2D graphics in the form of images, lines and shapes together with range of fill patterns and gradients.
   Exception encountered, of type "Error"
[cf30be8b] /index.php?action=history&feed=atom&title=Drawing_iPhone_2D_Graphics_with_Quartz Error from line 434 of /var/www/techotopia/includes/diff/DairikiDiff.php: Call to undefined function each()
Backtrace:
#0 /var/www/techotopia/includes/diff/DairikiDiff.php(544): DiffEngine->diag()
#1 /var/www/techotopia/includes/diff/DairikiDiff.php(344): DiffEngine->compareSeq()
#2 /var/www/techotopia/includes/diff/DairikiDiff.php(227): DiffEngine->diffLocal()
#3 /var/www/techotopia/includes/diff/DairikiDiff.php(721): DiffEngine->diff()
#4 /var/www/techotopia/includes/diff/DairikiDiff.php(859): Diff->__construct()
#5 /var/www/techotopia/includes/diff/DairikiDiff.php(980): MappedDiff->__construct()
#6 /var/www/techotopia/includes/diff/TableDiffFormatter.php(194): WordLevelDiff->__construct()
#7 /var/www/techotopia/includes/diff/DiffFormatter.php(140): TableDiffFormatter->changed()
#8 /var/www/techotopia/includes/diff/DiffFormatter.php(82): DiffFormatter->block()
#9 /var/www/techotopia/includes/diff/DifferenceEngine.php(881): DiffFormatter->format()
#10 /var/www/techotopia/includes/diff/DifferenceEngine.php(797): DifferenceEngine->generateTextDiffBody()
#11 /var/www/techotopia/includes/diff/DifferenceEngine.php(728): DifferenceEngine->generateContentDiffBody()
#12 /var/www/techotopia/includes/diff/DifferenceEngine.php(662): DifferenceEngine->getDiffBody()
#13 /var/www/techotopia/includes/FeedUtils.php(155): DifferenceEngine->getDiff()
#14 /var/www/techotopia/includes/actions/HistoryAction.php(325): FeedUtils::formatDiffRow()
#15 /var/www/techotopia/includes/actions/HistoryAction.php(290): HistoryAction->feedItem()
#16 /var/www/techotopia/includes/actions/HistoryAction.php(130): HistoryAction->feed()
#17 /var/www/techotopia/includes/actions/FormlessAction.php(43): HistoryAction->onView()
#18 /var/www/techotopia/includes/MediaWiki.php(490): FormlessAction->show()
#19 /var/www/techotopia/includes/MediaWiki.php(287): MediaWiki->performAction()
#20 /var/www/techotopia/includes/MediaWiki.php(714): MediaWiki->performRequest()
#21 /var/www/techotopia/includes/MediaWiki.php(508): MediaWiki->main()
#22 /var/www/techotopia/index.php(41): MediaWiki->run()
#23 {main}