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Drawing iOS 4 iPhone 2D Graphics with Quartz (Xcode 4)

28 bytes added, 20:02, 27 October 2016
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<table border="0" cellspacing="0" width="100%">
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<td width="20%">[[Detecting iOS 4 iPhone Touch Screen Gesture Motions (Xcode 4)|Previous]]<td align="center">[[iPhone iOS 4 Development Essentials Xcode 4 Edition|Table of Contents]]<td width="20%" align="right">[[An iOS 4 iPhone Graphics Drawing Tutorial using Quartz 2D (Xcode 4)|Next]]</td>
<tr>
<td width="20%">Detecting iOS 4 iPhone Touch Screen Gesture Motions (Xcode 4)<td align="center"><td width="20%" align="right">An iOS 4 iPhone Graphics Drawing Tutorial using Quartz 2D (Xcode 4)</td>
</table>
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== Points, Coordinates and Pixels ==
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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.
<googlehtmlet>BUY_IOS4XC4_BOTTOMios9_upgrade</googlehtmlet>
 
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<table border="0" cellspacing="0" width="100%">
<tr>
<td width="20%">[[Detecting iOS 4 iPhone Touch Screen Gesture Motions (Xcode 4)|Previous]]<td align="center">[[iPhone iOS 4 Development Essentials Xcode 4 Edition|Table of Contents]]<td width="20%" align="right">[[An iOS 4 iPhone Graphics Drawing Tutorial using Quartz 2D (Xcode 4)|Next]]</td>
<tr>
<td width="20%">Detecting iOS 4 iPhone Touch Screen Gesture Motions (Xcode 4<td align="center"><td width="20%" align="right">An iOS 4 iPhone Graphics Drawing Tutorial using Quartz 2D (Xcode 4)</td>
</table>