MIDP Programming - Java 2 Micro Edition Application Development - page 59

For drawing text, lcdui provides the method drawString() . In addition to the basic
drawString() method, several variants let you draw partial strings or single characters. (Details
about the additional methods can be found in the lcdui API documentation.) The simple
drawString() method takes four parameters: The character string to be displayed, the x and y
coordinates, and an integer determining the horizontal and vertical alignment of the text. The alignment
parameter lets you position the text relative to any of the four corners of its invisible surrounding box.
Additionally, the text can be aligned to the text baseline and the horizontal center. The sum or logical
or ( | ) of a constant for horizontal alignment ( LEFT , RIGHT , and HCENTER ) and constants for vertical
alignment ( TOP , BOTTOM , and BASELINE ) determine the actual alignment. Figure 3.12 shows the
anchor points for the valid constant combinations.
Figure 3.12. Valid combinations of the alignment constants and the corresponding
anchor points.
The following example illustrates the usage of the drawString() method. By choosing the anchor
point correspondingly, the text is displayed relative to the upper-left and lower-right corner of the
screen without overlapping the screen border:
import javax.microedition.lcdui.*;
class TextDemoCanvas extends Canvas {
public void paint (Graphics g) {
g.setGrayScale (255);
g.fillRect (0, 0, getWidth(), getHeight());
g.setGrayScale (0);
g.drawString ("Top/Left", 0, 0, Graphics.TOP |
Graphics.LEFT);
g.drawString ("Baseline/Center", getWidth() / 2, getHeight()
/ 2,
Graphics.HCENTER | Graphics.BASELINE);
g.drawString ("Bottom/Right", getWidth(), getHeight(),
Graphics.BOTTOM | Graphics.RIGHT);
}
}
Figure 3.13 shows the output of the TextDemo example.
Figure 3.13. Output of the TextDemo example.