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<googlehtmlet>BUY_IPADios9_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.
CGFloat components[] = {0.0, 0.0, 1.0, 0.5};
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<googlehtmlet>BUY_IPAD_BOTTOMios9_upgrade</googlehtmlet>
With both the colorspace and the components defined, the CGColorRef structure can be created:
<googlehtmlet>BUY_IPAD_BOTTOMios9_upgrade</googlehtmlet>
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