自拍偷在线精品自拍偷,亚洲欧美中文日韩v在线观看不卡

JavaMe開發(fā)：低級(jí)界面繪圖之點(diǎn)陣字

作者：tandesir
開發(fā) 后端
JavaMe自帶的字體只有三種：Font.SIZE_SMALL、Font.SIZE_MEDIA和Font.SIZE_LARGE，所謂的Font.SIZE_LARGE其實(shí)也不是很大。如果要繪制其他字號(hào)的字體該怎么辦呢？運(yùn)用低級(jí)界面Canvas繪制的點(diǎn)陣字是一個(gè)不錯(cuò)的選擇。

【問題描述】JavaMe自帶的字體只有三種：Font.SIZE_SMALL、Font.SIZE_MEDIA和Font.SIZE_LARGE，所謂的Font.SIZE_LARGE其實(shí)也不是很大。如果要繪制其他字號(hào)的字體該怎么辦呢？運(yùn)用低級(jí)界面Canvas繪制的點(diǎn)陣字是一個(gè)不錯(cuò)的選擇。

【字模工具】

曉奇工作室

取模方式：從左到右從上到下，橫向8點(diǎn)左高位

【分析】

所謂“點(diǎn)陣字”就是文字是由點(diǎn)陣構(gòu)成的。點(diǎn)陣字有兩個(gè)基本屬性，那就是寬(width)和高(height)。先看一個(gè)例子：

 

如圖1所示，Asc5x8表示寬度為5，高度為8的點(diǎn)陣字集。一個(gè)char型的字符能表示8位。取模工具實(shí)際上是用二進(jìn)制“1”，表示點(diǎn)陣的文字。用二進(jìn)制的“0”，表示非文字的空白塊。以Asc5x8的“！”為例進(jìn)行講解：

0x20,0x20,0x20,0x20,0x20,0x00,0x20,0x00, // -!-

對(duì)應(yīng)的點(diǎn)陣為：

00100000

00100000

00100000

00100000

00100000

00000000

00100000

00000000

注意到，如果將“1”替換為像素點(diǎn)顯示，而“0”替換為空白塊。則剛好顯示為一個(gè)“！”號(hào)。寬度為5，所以用一個(gè)字節(jié)表示就可以了。如果寬度超過一個(gè)字節(jié)，那么如何計(jì)算需要多少個(gè)字節(jié)才能表示寬度呢？原則是，寬度的表示必須為字節(jié)的倍數(shù)。如寬度為9，那么超過一個(gè)字節(jié)，所以用2個(gè)字節(jié)表示。

總結(jié)寬度所需字節(jié)計(jì)算公式如下：

n = (width-1)/8+1

Asc5x8中width即為5.

那么高度如何計(jì)算呢？高度其實(shí)不用進(jìn)行計(jì)算，由取模軟件完成了。

明白上述原理后，就很簡(jiǎn)單了。且看代碼。

 

【代碼清單】

  1. package com.token.view.components;  
  2.  
  3. import javax.microedition.lcdui.Graphics;  
  4. import javax.microedition.lcdui.game.GameCanvas;  
  5.  
  6. public class CustomFont {  
  7.       
  8.     public final char font24x48[][] =           // ASCII  
  9.     {  
  10.         {  
  11.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  // - -  
  12.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  13.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  14.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  15.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  16.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  17.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  18.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  19.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  20.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  21.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  22.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  23.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  24.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  25.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  26.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  27.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  28.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 
  29.         },  
  30.  
  31.         {  
  32.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  // -!-  
  33.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  34.             0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x00,  
  35.             0x00,0x78,0x00,0x00,0x78,0x00,0x00,0x78,  
  36.             0x00,0x00,0x78,0x00,0x00,0x78,0x00,0x00,  
  37.             0x78,0x00,0x00,0x78,0x00,0x00,0x78,0x00,  
  38.             0x00,0x78,0x00,0x00,0x78,0x00,0x00,0x30,  
  39.             0x00,0x00,0x30,0x00,0x00,0x30,0x00,0x00,  
  40.             0x30,0x00,0x00,0x30,0x00,0x00,0x30,0x00,  
  41.             0x00,0x30,0x00,0x00,0x30,0x00,0x00,0x30,  
  42.             0x00,0x00,0x30,0x00,0x00,0x30,0x00,0x00,  
  43.             0x30,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  44.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  45.             0x00,0x00,0x70,0x00,0x00,0xF8,0x00,0x00,  
  46.             0xF8,0x00,0x00,0xF8,0x00,0x00,0x70,0x00,  
  47.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  48.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  49.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 
  50.         },  
  51.  
  52.         {  
  53.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  // -"-  
  54.             0x00,0x00,0xC0,0xC0,0x01,0xE1,0xE0,0x03,  
  55.             0xE3,0xE0,0x03,0xC3,0xC0,0x07,0x87,0x80,  
  56.             0x07,0x07,0x00,0x0E,0x0E,0x00,0x0C,0x0C,  
  57.             0x00,0x18,0x18,0x00,0x10,0x10,0x00,0x20,  
  58.             0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  59.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  60.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  61.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  62.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  63.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  64.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  65.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  66.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  67.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  68.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  69.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  70.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 
  71.         },  
  72.           
  73.         ...  
  74.  
  75.         {  
  76.             0x07,0x80,0x00,0x1F,0xC0,0x00,0x10,0xE0,  // --  
  77.             0x04,0x20,0x70,0x04,0x20,0x38,0x08,0x40,  
  78.             0x1C,0x08,0x40,0x0F,0x10,0x00,0x07,0xF0,  
  79.             0x00,0x03,0xC0,0x00,0x00,0x00,0x00,0x00,  
  80.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  81.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  82.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  83.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  84.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  85.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  86.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  87.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  88.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  89.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  90.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  91.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  92.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,  
  93.             0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 
  94.         }  
  95.         };  
  96.               
  97.     public CustomFont()  
  98.     {  
  99.           
  100.     }  
  101.       
  102.     public void drawmat(GameCanvas canvas, Graphics g, char mat[], int w, int h, int x, int y, int color)  
  103.     {  
  104.         int i,j,k,n;  
  105.           
  106.         n = (w-1)/8+1;  
  107.         for(j=0; j<h; j++)  
  108.         {  
  109.             for(i=0; i<n; i++)  
  110.             {  
  111.                 for(k=0; k<8; k++)  
  112.                 {  
  113.                     if (!((mat[j * n + i] & (0x80 >> k)) == 0)) /* 測(cè)試為1的位則顯示 */    
  114.                              {     
  115.                         g.setColor(color);     
  116.                                     g.drawLine(x + i * 8 + k, y + j, x + i * 8 + k, y + j);     
  117.                                 }     
  118.  
  119.                 }  
  120.             }  
  121.         }  
  122.     }  
  123.  
  124. }  

n就是表示整個(gè)寬度需要的字節(jié)數(shù)，由于寬度為24，故需要3個(gè)字節(jié)表示。j記錄縱向（高度）位置。代碼的處理，就是通過一個(gè)畫線函數(shù)進(jìn)行的。每次以字節(jié)為單位(變量k處理)，對(duì)“1”進(jìn)行檢測(cè)，檢測(cè)到1后，記錄k的位置。

 

【調(diào)用方法】

CustomFont主要用于GameCanvas派生的類。在繼承GameCanvas的類中：

(1)聲明對(duì)象

  1. private CustomFont cf; 

(2) 初始化對(duì)象(在構(gòu)造函數(shù)中)

  1. cf = new CustomFont(); 

(3) 調(diào)用方法(畫字符串passwd)

  1. for(int i=0; i<passwd.length(); i++)  
  2. {  
  3.                       
  4.     cf.drawmat(this, graphics, cf.font24x48[passwd.charAt(i)-' '], 24, 48, (width-6*24)/2+i*24, (height-48)/3, Color.WHITE);  
  5. } 

【效果】

圖2中，框中的文字就是通過繪制得到的。

 

【設(shè)計(jì)參考】 

(1) http://aiquantong.iteye.com/blog/1457906

(2) http://blog.csdn.net/alleniversoncomputer/article/details/7016368

原文鏈接：http://blog.csdn.net/tandesir/article/details/7506065

【系列文章】

  1. JavaMe開發(fā)：低級(jí)界面繪圖之點(diǎn)陣字
  2. JavaMe開發(fā)：低級(jí)界面繪圖之菜單
  3. JavaMe開發(fā)：也說MVC設(shè)計(jì)模式
  4. JavaMe開發(fā)：繪制可自動(dòng)換行文本
  5. JavaMe開發(fā)：繪制文本框TextEdit
  6. JavaM開發(fā)：自適應(yīng)滾動(dòng)顯示
責(zé)任編輯：林師授 來源： tandesir的博客
JavaMeJava
相關(guān)推薦

2012-05-09 10:03:08

JavaMEJava

2012-05-09 10:09:18

JavaMEJava

2012-05-09 10:58:25

JavaMEJava

2012-05-09 10:35:36

JavaMEJava

2012-05-09 10:22:44

JavaMEJava

2010-06-03 14:01:26

JavaSEJavaMEiPhone

2009-09-22 17:53:32

C# COM組件開發(fā)

2011-08-10 18:24:22

iPhone 圖形 繪圖

2013-09-16 15:50:04

Android優(yōu)化界面UI

2013-09-16 15:33:28

Android優(yōu)化界面UI

2013-09-16 15:42:00

Android優(yōu)化界面UI

2011-08-29 15:30:53

JavaMELua

2022-08-26 08:18:04

軟件開發(fā)高級(jí)系統(tǒng)設(shè)計(jì)低級(jí)系統(tǒng)設(shè)計(jì)

2013-04-23 17:11:47

Windows Pho用Express Bl

2014-02-26 09:13:39

2023-05-30 14:50:20

界面開發(fā)鴻蒙

2011-05-03 16:41:04

BlackBerry

2022-09-02 14:56:24

Python界面開發(fā)庫(kù)框架

2011-06-21 14:53:25

QT 界面美化 QStyle

2009-06-04 09:15:45

JavaME手機(jī)程序認(rèn)Java手機(jī)
點(diǎn)贊
收藏

51CTO技術(shù)棧公眾號(hào)