1) Updated to use ARC and modern Objective-C syntax (including use of properties and autosynthesis). 2) Refactored drawing code into ASCSquiggle. 3) Converted document-based application to a window-based application. 4) Updated *.nib to *.xib 5) Updated comments, and also reformatted some of the comments. 6) Added logical pragma marks to separate different parts of the code. 7) Each class now has ASC (Apple Sample Code) prefixes.

Bug fix: modified SquiggleView to override -isOpaque; changed -initWithCoder to assign self.

Demonstrates many Cocoa fundamentals in a Document-based Application featuring custom drawing and event-handling.