Java Reference
In-Depth Information
Method
Description
FontMetrics
methods
public int
getAscent()
Returns the ascent of a font in points.
public int
getDescent()
Returns the descent of a font in points.
public int
getLeading()
Returns the leading of a font in points.
public int
getHeight()
Returns the height of a font in points.
Graphics
methods for getting a
Font
's
FontMetrics
public
FontMetrics getFontMetrics()
Returns the
FontMetrics
object for the current drawing
Font
.
public
FontMetrics getFontMetrics(Font f)
Returns the
FontMetrics
object for the specified
Font
argument.
Fig. 13.14
|
FontMetrics
and
Graphics
methods for obtaining font metrics.
1
// Fig. 13.15: MetricsJPanel.java
2
// FontMetrics and Graphics methods useful for obtaining font metrics.
3
import
java.awt.Font;
4
5
import
java.awt.FontMetrics;
import
java.awt.Graphics;
6
import
javax.swing.JPanel;
7
8
public
class
MetricsJPanel
extends
JPanel
9
{
10
// display font metrics
11
@Override
12
public
void
paintComponent(Graphics g)
13
{
14
super
.paintComponent(g);
15
16
g.setFont(
new
Font(
"SansSerif"
,
Font.BOLD
,
12
));
17
FontMetrics metrics = g.getFontMetrics();
g.getFont()
metrics.getAscent()
metrics.getDescent()
metrics.getHeight()
metrics.getLeading()
18
g.drawString(
"Current font: "
+
,
10
,
30
);
19
g.drawString(
"Ascent: "
+
,
10
,
45
);
20
g.drawString(
"Descent: "
+
,
10
,
60
);
21
g.drawString(
"Height: "
+
,
10
,
75
);
22
g.drawString(
"Leading: "
+
,
10
,
90
);
23
24
Font font =
new
Font(
"Serif"
,
Font.ITALIC
,
14
);
25
metrics = g.getFontMetrics(font);
26
g.setFont(font);
27
g.drawString(
"Current font: "
+ font,
10
,
120
);
28
g.drawString(
"Ascent: "
+
metrics.getAscent()
metrics.getDescent()
metrics.getHeight()
metrics.getLeading()
,
10
,
135
);
29
g.drawString(
"Descent: "
+
,
10
,
150
);
30
g.drawString(
"Height: "
+
,
10
,
165
);
31
g.drawString(
"Leading: "
+
,
10
,
180
);
32
}
33
}
// end class MetricsJPanel
Fig. 13.15
|
FontMetrics
and
Graphics
methods useful for obtaining font metrics.
