Java: Fonts - Centering Text
To find the size of text
For graphical output it's sometimes necessary to know how much
vertical and horizontal space
text actually uses. To find the size of a font or
of a particular String, get a FontMetrics object with a call to
getFontMetrics on either a Component, Graphics, or Toolkit object.
See below.
Centering Text
From a FontMetrics object for the the current graphics context
(eg, the screen or printer) and the current font the width, height,
and other distances can be obtained.
// Find the size of string s in font f in the current Graphics context g.
FontMetrics fm = g.getFontMetrics(f);
java.awt.geom.Rectangle2D rect = fm.getStringBounds(s, g);
int textHeight = (int)(rect.getHeight());
int textWidth = (int)(rect.getWidth());
int panelHeight= this.getHeight();
int panelWidth = this.getWidth();
// Center text horizontally and vertically
int x = (panelWidth - textWidth) / 2;
int y = (panelHeight - textHeight) / 2 + fm.getAscent();
g.drawString(s, x, y); // Draw the string.
Obsolete Fonts and Methods
In Java 1.0 the following names were used: Courier instead of Monospaced,
Helvetica instead of SansSerif, and TimesRoman instead of Serif.
The Java 1.0 names are traditional type fonts for Latin characters,
but don't apply to other writing systems (eg, Chinese, Thai, etc).
The new names (Monospaced, SansSerif, Serif) should be used because
they can be applied to other writing systems.
Do not use the deprecated Toolkit getFontList() method.