Cocoa’s NSImage Class
by Michael Mahoney, Simson Garfinkel
Building Cocoa Applications: A Step by Step Guide
- Building Cocoa Applications: A Step-by-Step Guide
- Preface
- I. Cocoa Overview
- 1. Understanding theAqua Interface
- What Makes Mac OS X So Special?
- A Quick Look at the Mac OS X User Interface
- Basic Principles of the Aqua Interface
- The Mouse and Cursor
- Window Types and Behavior
- Menus and the Menu Bar
- The Dock
- Controls
- The Finder
- Configuring Your Desktop, Step by Step
- Menu Guidelines and Keyboard Equivalents
- Working with the Filesystem,Step by Step
- Summary
- Exercises
- References
- 2. Tools for Developing Cocoa Applications
- 3. Creating a Simple Application with Interface Builder
- 4. An Objective-C ApplicationWithout Interface Builder
- The Tiny.m Program
- An Introduction to Objective-C
- Objects and Classes
- Methods and Messaging
- The id Data Type
- A Simple Class Example
- Creating and Initializing Objects
- The @interface Directive
- The #import Directive
- Destroying Objects
- The @implementation Directive
- The +alloc Method and the NSObject Root Class
- NSString, NSMutableString, and NSLog
- autorelease and the NSAutoreleasePool Class
- Tiny.m Revisited
- Summary
- Exercises
- References
- 1. Understanding theAqua Interface
- II. Calculator: Building a Simple Application
- 5. Building a Project: A Four-Function Calculator
- Getting Started: Building the Calculator Project
- Building the Calculator’s User Interface
- Building the Calculator’s Controller Class
- Customizing Buttons and Making Connections
- Compiling and Running a Program
- Compiler Error Messages
- The enterDigit: Action Method
- Adding the Four Calculator Functions
- Adding the Unary Minus Function to the Controller Class
- The Files in a Project
- Summary
- Exercises
- 6. Nibs and Icons
- 7. Delegation and Resizing
- 8. Events and Responders
- 9. Darwin and the Window Server
- 5. Building a Project: A Four-Function Calculator
- III. MathPaper: A Multiple-Document, Multiprocess Application
- 10. MathPaper and Cocoa’sDocument-Based Architecture
- 11. Tasks, Pipes, and NSTextView
- 12. Rich Text Format and NSText
- 13. Saving, Loading, and Printing
- 14. Drawing with Quartz
- 15. Drawing in a Rectangle: More Fun with Cocoa Views
- IV. GraphPaper: A Multithreaded, Mouse-Tracking Application
- 16. GraphPaper: A Multithreaded Application with a Display List
- GraphPaper’s Design
- Working with Multiple Threads
- Building the GraphPaper Application
- Changes to the Evaluator Back End
- Building GraphPaper’s Interface
- The GraphView Class Interface File
- The GraphView Class Implementation File
- The initWithFrame: Method
- Implementing the Display List
- Scaling the GraphView and the drawRect: Method
- The Data Stuffer Methods
- Stopping a Running Graph
- The Graph Displayer
- The Segment Class
- Testing GraphPaper
- Extending the Display List
- Summary
- Exercises
- References
- 17. Color
- Colors and Color Objects
- Adding Color to GraphPaper
- Creating a Preferences Panel
- The Controller Class
- Creating the Preferences Nib, Panel, and PrefController
- PrefController Class Implementation
- ColorGraphView
- The ColorGraphView Class Implementation
- Setting the Colors
- Setting the Initial Color
- The GraphView, Segment, and Label Classes
- Testing GraphPaper’s Color
- Summary
- Exercises
- 18. Tracking the Mouse
- 19. Zooming and Saving Graphics Files
- 20. Pasteboards, Services, Modal Sessions, and Drag-and-Drop
- 21. Preferences and Defaults
- 16. GraphPaper: A Multithreaded Application with a Display List
- A. Cocoa Resources
- Index
- Colophon
In the previous example, we used an NSImageView object to display an image in our About box. The NSImageView class actually calls on another class, NSImage, to do its work. NSImage is the workhorse class for all images within the Cocoa development environment.
Cocoa uses objects of the NSImage class to display practically any kind of image on the screen. In Cocoa Version 10.1, the NSImage class could handle all the following types of images, and more:
Portable Document Format (PDF)
Tagged Image File Format (TIFF)
Windows Bitmap Format (BMP)
Graphics Interchange Format (GIF)
Joint Photographic Experts Group format ( JPEG)
Macintosh Picture format (PICT)
Untagged (raw) bitmap data
The NSImage class can also be extended on the fly by other programs that “register” themselves as filter services .[18] Because your programs will use the NSImage class, they too will be able to read images in any of these formats — without any additional work on your part.
[18] We’ll discuss Cocoa services in Chapter 20, but we won’t implement a filter service. For more information on filter services, please consult the NSImage documentation.
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