June 2013
Beginner
1007 pages
33h 32m
English
Content preview from Learning Java, 4th Edition
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The Big Picture
The classes you’ll use for drawing come from six packages:
java.awt, java.awt.color,
java.awt.font, java.awt.geom, java.awt.image, and
java.awt.print.
Collectively, these classes make up most of the 2D API and cover the
drawing of shapes, text, and images. Figure 20-1 shows a bird’s-eye view of these
classes. There’s much more in the 2D API than we can cover in two
chapters. For a full treatment, see Jonathan Knudsen’s Java 2D
Graphics (O’Reilly).
An instance of java.awt.Graphics2D is called a
graphics context. It represents a drawing
surface—such as a component’s display area, a page on a printer, or an
offscreen image buffer. A graphics context provides methods for drawing
three kinds of graphics objects: shapes, text, and images. Graphics2D is called a graphics context because
it also holds contextual information about the drawing area. This
information includes the drawing area’s clipping region, painting color,
transfer mode, text font, and geometric transformation. If you consider the drawing
area to be a painter’s canvas, you might think of a graphics context as an
easel that holds a set of tools and marks off the work area.
Figure 20-1. Graphics classes of the 2D API
There are four ways to acquire a Graphics2D object. The following list describes
them in order from the most common to the least:
- From AWT or Swing as the result of a painting request on a component ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.