This document discusses drawing and touch input in iPhone applications. It covers Quartz 2D drawing, how to draw basic shapes like lines, rectangles and paths, how to fill paths with color, and how to draw images. It also discusses touch events like touchesBegan, touchesEnded and touchesMoved, and how to get all current touches. The examples and exercises sections provide code snippets for working with these drawing and touch functions.

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iPhone Training
Lesson 3

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Contents
1 Drawing
2 Touch and input
4 Example 3
5 Exercise 3
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Drawing
 Quartz 2D
 Quartz 2D is a two dimensional graphics drawing engine that
makes up the bulk of the UIKit Core Graphics Framework.
 It is a C based application programming interface (API) and as
such is utilized primarily through calls to a range of C functions.
 Quartz 2D drawing typically takes place on a UIView object.
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Drawing
 Drawing a line
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Drawing
 Drawing a line
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Drawing
 Drawing paths
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Drawing
 Drawing paths
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Drawing
 Drawing Rectangle
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Drawing
 Drawing Rectangle
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Drawing
 Filling a path with a color
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Drawing
 Filling a path with a color
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Drawing
 Drawing an image into Graphic Context
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Drawing
 Filling a path with a color
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Touch and input
 Events
 touchesBegan:withEvent:
 touchesEnded:withEvent:
 touchesMoved:withEvent:
 Get all touches on the screen
 NSSet *allTouches = [event allTouches];
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Example 3
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Exercise 3
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