Java Reference
In-Depth Information
Figure 6.8
This diagram shows a portion of the
java.awt.geom
package hierarchy.
The
java.awt.Shape
interface is implemented by the non-abstract classes
(rectangles) and abstract classes (parallelograms). Each of the abstract “2D” classes
contains nested non-abstract
Float
and
Double
subclasses as shown here only for
Line2D
.
The ellipse drawn fits inside a rectangle with upper left corner at (x, y)
(25.0,
25.0) and with width 100.0 and height 100.0. Since this rectangle is really a
square (width
=
=
=
100.0), the ellipse is a circle.
This may seem a lot of work but remember that for simple one pixel wide
primitives you can still use the simpler
Graphics
methods. Also, some settings,
such as the
RenderingHints
, are normally set just once at the start of your
paintComponent()
method.
height
6.8.3 Drawing demo
The following subclass of
JPanel
illustrates some of the techniques discussed
above. The
Graphics2D
object is cast from the
Graphics
object. Anti-aliasing
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