Java Reference
In-Depth Information
public class RectangleComponent extends JComponent
{
public void paintComponent(Graphics g)
{
// Recover Graphics2D
Graphics2D g2 = (Graphics2D) g
;
. . .
}
}
Now you are ready to draw shapes. The
draw
method of the
Graphics2D
class can
draw shapes, such as rectangles, ellipses, line segments, polygons, and arcs. Here we
draw a rectangle:
public class RectangleComponent extends JComponent
{
public void paintComponent(Graphics g)
{
. . .
Rectangle box = new Rectangle(5, 10, 20,
30);
g2.draw
(box);
. . .
}
}
Following is the source code for the
RectangleComponent
class. Note that the
paintComponent
method of the
RectangleComponent
class draws two
rectangles.
As you can see from the
import
statements, the
Graphics
and
Graphics2D
classes are part of the
java.awt
package.
ch02/rectangles/RectangleComponent.java
1
import
java.awt.Graphics;
2
import
java.awt.Graphics2D;
3
import
java.awt.Rectangle;
4
import
javax.swing.JComponent;
5
6 /**
7
A component that draws two rectangles.
