Points vs Pixels in iOS

In the previous tutorial we had to deal with a number of different resolutions in order to be able to develop a universal app. This raised some questions on the forum about how to handle this. I have expanded on that answer and stuck it up on the Codea Tutorial site at http://codeatuts.blogspot.com.au/

From iOS 4, dimensions are measured in “points” instead of pixels. All coordinate values and distances are specified using points, which are floating-point values. The measurable size of a point varies from device to device and is largely irrelevant. The main thing to understand about points is that they provide a fixed frame of reference for drawing…

You can read the rest of the tutorial at http://codeatuts.blogspot.com.au/2012/11/interlude-13-pixels-vs-points-in-ios.html