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Inside Macintosh: Imaging With QuickDraw /

Chapter 3 - QuickDraw Drawing

This chapter describes routines common to both basic QuickDraw and Color QuickDraw that you can use to draw lines, rectangles, rounded rectangles, ovals, arcs, wedges, polygons, and regions, and to copy images from one graphics port to another. This chapter also describes the routines that you can use to perform calculations and other manipulations of these shapes--including comparing them and finding their unions and intersections, and moving, shrinking, and expanding them.

Read this chapter to learn how to draw on all models of Macintosh computers. All of the routines described in this chapter depend on your application to create a graphics port drawing environment as described in the previous chapter, "Basic QuickDraw." As noted in this chapter, many of these routines have additional capabilities when performed in the more sophisticated color drawing environments described in the next chapter in this book, "Color QuickDraw." However, if your application does not use color, or uses only a few colors, you may find it unnecessary to create the drawing environment described in the chapter "Color QuickDraw."

This chapter also describes how to copy a bit image from one onscreen graphics port to another onscreen graphics port. To prevent the choppiness that can occur when you build complex images onscreen, your application should use the drawing routines described in this chapter to create complex images in offscreen graphics worlds. Your application can then copy these images to onscreen graphics ports, as described in the chapter "Offscreen Graphics Worlds" in this book.

QuickDraw also supports the creation and manipulation of pictures and text. The chapter "Pictures" in this book describes the routines for drawing pictures. For information about drawing text, see the chapter "QuickDraw Text" in Inside Macintosh: Text.

This chapter describes how to

Chapter Contents
About QuickDraw Drawing
The Graphics Pen
Bit Patterns
Boolean Transfer Modes With 1-Bit Pixels
Lines and Shapes
Defining Lines and Shapes
Framing Shapes
Painting and Filling Shapes
Erasing Shapes
Inverting Shapes
Other Graphic Entities
The Eight Basic QuickDraw Colors
Drawing With QuickDraw
Drawing Lines
Drawing Rectangles
Drawing Ovals, Arcs, and Wedges
Drawing Regions and Polygons
Performing Calculations and Other Manipulations of Shapes
Copying Bits Between Graphics Ports
Customizing QuickDraw's Low-Level Routines
QuickDraw Drawing Reference
Data Structures
Managing the Graphics Pen
Changing the Background Bit Pattern
Drawing Lines
Creating and Managing Rectangles
Drawing Rectangles
Drawing Rounded Rectangles
Drawing Ovals
Drawing Arcs and Wedges
Creating and Managing Polygons
Drawing Polygons
Creating and Managing Regions
Drawing Regions
Scaling and Mapping Points, Rectangles, Polygons, and Regions
Calculating Black-and-White Fills
Copying Images
Drawing With the Eight-Color System
Determining Whether QuickDraw Has Finished Drawing
Getting Pattern Resources
Customizing QuickDraw Operations
The Pattern Resource
The Pattern List Resource
Summary of QuickDraw Drawing
Pascal Summary
Data Types
C Summary
Data Types
Assembly-Language Summary
Data Structures
Global Variables

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© Apple Computer, Inc.
7 JUL 1996