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

25 bytes added, 20:02, 27 October 2016
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<googlehtmlet>BUY_IOS4XC4ios9_upgrade</googlehtmlet>
== Points, Coordinates and Pixels ==
<googlehtmlet>ADSDAQBOX_FLOWadsdaqbox_flow</googlehtmlet>
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>
 
<htmlet>ezoicbottom</htmlet>
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<table border="0" cellspacing="0" width="100%">