【问题描述】JavaMe自带的字体只有三种：Font.SIZE_SMALL、Font.SIZE_MEDIA和Font.SIZE_LARGE，所谓的Font.SIZE_LARGE其实也不是很大。如果要绘制其他字号的字体该怎么办呢？运用低级界面Canvas绘制的点阵字是一个不错的选择。
【字模工具】
晓奇工作室
取模方式：从左到右从上到下，横向8点左高位
【分析】
所谓“点阵字”就是文字是由点阵构成的。点阵字有两个基本属性，那就是宽(width)和高(height)。先看一个例子：
图1 ASCII码取模
如图1所示，Asc5x8表示宽度为5，高度为8的点阵字集。一个char型的字符能表示8位。取模工具实际上是用二进制“1”，表示点阵的文字。用二进制的“0”，表示非文字的空白块。以Asc5x8的“！”为例进行讲解：
0x20,0x20,0x20,0x20,0x20,0x00,0x20,0x00, // -!-
对应的点阵为：
00100000
00100000
00100000
00100000
00100000
00000000
00100000
00000000
注意到，如果将“1”替换为像素点显示，而“0”替换为空白块。则刚好显示为一个“！”号。宽度为5，所以用一个字节表示就可以了。如果宽度超过一个字节，那么如何计算需要多少个字节才能表示宽度呢？原则是，宽度的表示必须为字节的倍数。如宽度为9，那么超过一个字节，所以用2个字节表示。
总结宽度所需字节计算公式如下：
n = (width-1)/8+1
Asc5x8中width即为5.
那么高度如何计算呢？高度其实不用进行计算，由取模软件完成了。
明白上述原理后，就很简单了。且看代码。
【代码清单】
[html] package com.token.view.components;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.game.GameCanvas;
public class CustomFont {
public final char font24x48[][] = // ASCII
{
{
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, // - -
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
},
{
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, // -!-
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x00,
0x00,0x78,0x00,0x00,0x78,0x00,0x00,0x78,
0x00,0x00,0x78,0x00,0x00,0x78,0x00,0x00,
0x78,0x00,0x00,0x78,0x00,0x00,0x78,0x00,
0x00,0x78,0x00,0x00,0x78,0x00,0x00,0x30,
0x00,0x00,0x30,0x00,0x00,0x30,0x00,0x00,
0x30,0x00,0x00,0x30,0x00,0x00,0x30,0x00,
0x00,0x30,0x00,0x00,0x30,0x00,0x00,0x30,
0x00,0x00,0x30,0x00,0x00,0x30,0x00,0x00,
0x30,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x70,0x00,0x00,0xF8,0x00,0x00,
0xF8,0x00,0x00,0xF8,0x00,0x00,0x70,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
},
{
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, // -"-
0x00,0x00,0xC0,0xC0,0x01,0xE1,0xE0,0x03,