Unity3d游戏中实现阿拉伯语文字正常显示

时间：2018-02-09 20:31:58 阅读：603 评论：0 收藏：0 [点我收藏+]

Unity3d游戏中实现阿拉伯语文字正常显示

由于项目需求要把游戏文字显示为维语版本（维语属于阿拉伯语系），我先把维语替换进去，之后发现文字是错的（每个字符都分开了，而且显示方向也不对）后来在网上查了一下发现阿拉伯语是从右往左读的，并且阿拉伯语的32个字符单说写法就有126种（同一个字符有多种写法）如下图：

技术分享图片

部分维语字符的不同书写形式

首先我们来了解一下维语：

① 维文是以阿拉伯字母为基层的因素文字，由32个字母构成。分为元音、辅音两大类。
② 8个元音又分三类；3个前元音、3个后元音、2个央元音。每个词的元音要么都是前元音，要么都是后元音。这8个元音中有4个同汉语元音等值完全相同，有4个相差较大。
③ 24个辅音又分为两类；分别为：10个清音、14个浊音。这24个辅音中有20个同汉语声母辅音等值完全相同，有4个相差较大。
④ 注有“新维文”字样的框格，代表发音相差较大。

书写规则：

【单立式】（又称独立式、独写体）用于词末尾单独构成一个音节时。
【后连式】（又称连首体）用于词首或音节首。
【双连式】（又称前后连式、中连式、连中体）用于两种书写形式的辅音字母之外的其余辅音字母的中间。
【隔音双连式】（又称隔音前后连式）用于词中的音节首。
【前连式】（又称连尾体）用于词末尾与前面的字母相连。
【隔音前连式】用于词末尾与前面的字母连写单独构成一个音节。
【简单单立式】用于词末尾而且是两种书写形式的辅音字母之后。
【简单后连式】用于词中间而且是两种书写形式的辅音字母之后。

上面这都是在网上看到的怎么感觉有点像我们小时候学习 a o e 一样了呢，哈哈.. 不得不说，真的看不懂！

其实看到这些字符我是一脸懵逼，不是龙舟就是战舰的，最主要的是不认识。

最开始我是在网上找了个插件（如果在看到我这篇博客之前你查过阿拉伯语的显示问题，你一定也在GitHub上看到过ArabicSupport这个插件吧），它不过也就是把文字显示方向可以修改过来，但是里边还是存在很多问题的，后来修改了他的源码，这才把项目里的阿拉伯语正常显示出来！当你仔细看他demo源码的时候就会发现，他的做法是把一句话的每个字符分别存到两个数组里，然后用Unicode编码进行比对、替换。打开一个阿拉伯语字体你会看到每一个字符都会有它对应的Unicode编码。如下图：

技术分享图片

图一图二

图二中一套字体里为什么会有长得一样的字符呢？点开一个字符，然后左下角你会发现对应的Unicode编码是不同的，并且一个是独立形式，另一个是非独立形式。然而那些错误的字符就是因为使用的非独立形式，才导致再次变形的时候出现错误，我们要做的就是要把这些读取出来的非独立形式转换为独立形式，做好映射！

然后在GitHub那个Demo的源码中我们看到他里面提供了几个接口，分别是判断当前字符要使用前连书体、后边书体、还是前后连书体或独立书体，修改代码如下：

  1     /// <summary>
  2     /// Checks if the letter at index value is a leading character in Arabic or not.
  3     /// </summary>
  4     /// <param name="letters">The whole word that contains the character to be checked</param>
  5     /// <param name="index">The index of the character to be checked</param>
  6     /// <returns>True if the character at index is a leading character, else, returns false</returns>
  7     internal static bool IsLeadingLetter(char[] letters, int index)
  8     {
  9 
 10         bool lettersThatCannotBeBeforeALeadingLetter = index == 0 
 11             || letters[index - 1] == ‘ ‘ 
 12                 || letters[index - 1] == ‘*‘ // ??? Remove?
 13                 || letters[index - 1] == ‘A‘ // ??? Remove?
 14                 || char.IsPunctuation(letters[index - 1])
 15                 || char.IsNumber(letters[index - 1])
 16                 || letters[index - 1] == ‘>‘ 
 17                 || letters[index - 1] == ‘<‘ 
 18                 || letters[index - 1] == (int)IsolatedArabicLetters.Alef
 19                 || letters[index - 1] == (int)IsolatedArabicLetters.Dal 
 20                 || letters[index - 1] == (int)IsolatedArabicLetters.Thal
 21                 || letters[index - 1] == (int)IsolatedArabicLetters.Ra2 
 22                 || letters[index - 1] == (int)IsolatedArabicLetters.Zeen 
 23                 || letters[index - 1] == (int)IsolatedArabicLetters.PersianZe
 24                 //|| letters[index - 1] == (int)IsolatedArabicLetters.AlefMaksora 
 25                 || letters[index - 1] == (int)IsolatedArabicLetters.Waw
 26                 || letters[index - 1] == (int)IsolatedArabicLetters.AlefMad 
 27                 || letters[index - 1] == (int)IsolatedArabicLetters.AlefHamza
 28                 || letters[index - 1] == (int)IsolatedArabicLetters.AlefMaksoor 
 29                 || letters[index - 1] == (int)IsolatedArabicLetters.WawHamza
 30                 || letters[index - 1] == (int)IsolatedArabicLetters.Ae
 31                 || letters[index - 1] == (int)IsolatedArabicLetters.U
 32                 || letters[index - 1] == (int)IsolatedArabicLetters.Yu
 33                 || letters[index - 1] == (int)IsolatedArabicLetters.Oe
 34                 || letters[index - 1] == (int)IsolatedArabicLetters.Ve;
 35 
 36         bool lettersThatCannotBeALeadingLetter = letters[index] != ‘ ‘ 
 37             && letters[index] != (int)IsolatedArabicLetters.Dal
 38             && letters[index] != (int)IsolatedArabicLetters.Thal
 39                 && letters[index] != (int)IsolatedArabicLetters.Ra2 
 40                 && letters[index] != (int)IsolatedArabicLetters.Zeen 
 41                 && letters[index] != (int)IsolatedArabicLetters.PersianZe
 42                 && letters[index] != (int)IsolatedArabicLetters.Alef 
 43                 && letters[index] != (int)IsolatedArabicLetters.AlefHamza
 44                 && letters[index] != (int)IsolatedArabicLetters.AlefMaksoor
 45                 && letters[index] != (int)IsolatedArabicLetters.AlefMad
 46                 && letters[index] != (int)IsolatedArabicLetters.WawHamza
 47                 && letters[index] != (int)IsolatedArabicLetters.Waw
 48                 && letters[index] != (int)IsolatedArabicLetters.Hamza
 49                 && letters[index] != (int)IsolatedArabicLetters.Ae
 50                 && letters[index] != (int)IsolatedArabicLetters.U
 51                 && letters[index] != (int)IsolatedArabicLetters.Yu
 52                 && letters[index] != (int)IsolatedArabicLetters.Oe
 53                 && letters[index] != (int)IsolatedArabicLetters.Ve;
 54 
 55         bool lettersThatCannotBeAfterLeadingLetter = index < letters.Length - 1 
 56             && letters[index + 1] != ‘ ‘
 57                 && !char.IsPunctuation(letters[index + 1] )
 58                 && !char.IsNumber(letters[index + 1])
 59                 && !char.IsSymbol(letters[index + 1])
 60                 && !char.IsLower(letters[index + 1])
 61                 && !char.IsUpper(letters[index + 1])
 62                 && letters[index + 1] != (int)IsolatedArabicLetters.Hamza;
 63 
 64         if(lettersThatCannotBeBeforeALeadingLetter && lettersThatCannotBeALeadingLetter && lettersThatCannotBeAfterLeadingLetter)
 65         {
 66             return true;
 67         }
 68         else
 69             return false;
 70     }
 71 
 72     /// <summary>
 73     /// Checks if the letter at index value is a finishing character in Arabic or not.
 74     /// </summary>
 75     /// <param name="letters">The whole word that contains the character to be checked</param>
 76     /// <param name="index">The index of the character to be checked</param>
 77     /// <returns>True if the character at index is a finishing character, else, returns false</returns>
 78     internal static bool IsFinishingLetter(char[] letters, int index)
 79     {
 80         bool indexZero = index != 0;
 81         bool lettersThatCannotBeBeforeAFinishingLetter = (index == 0) ? false : 
 82                 letters[index - 1] != ‘ ‘
 83                 && letters[index - 1] != (int)IsolatedArabicLetters.Dal 
 84                 && letters[index - 1] != (int)IsolatedArabicLetters.Thal
 85                 && letters[index - 1] != (int)IsolatedArabicLetters.Ra2 
 86                 && letters[index - 1] != (int)IsolatedArabicLetters.Zeen 
 87                 && letters[index - 1] != (int)IsolatedArabicLetters.PersianZe
 88                 //&& letters[index - 1] != (int)IsolatedArabicLetters.AlefMaksora 
 89                 && letters[index - 1] != (int)IsolatedArabicLetters.Waw
 90                 && letters[index - 1] != (int)IsolatedArabicLetters.Alef 
 91                 && letters[index - 1] != (int)IsolatedArabicLetters.AlefMad
 92                 && letters[index - 1] != (int)IsolatedArabicLetters.AlefHamza 
 93                 && letters[index - 1] != (int)IsolatedArabicLetters.AlefMaksoor
 94                 && letters[index - 1] != (int)IsolatedArabicLetters.WawHamza 
 95                 && letters[index - 1] != (int)IsolatedArabicLetters.Hamza
 96                 && letters[index - 1] != (int)IsolatedArabicLetters.Ae
 97                 && letters[index - 1] != (int)IsolatedArabicLetters.U
 98                 && letters[index - 1] != (int)IsolatedArabicLetters.Yu
 99                 && letters[index - 1] != (int)IsolatedArabicLetters.Oe
100                 && letters[index - 1] != (int)IsolatedArabicLetters.Ve
101 
102 
103                 && !char.IsNumber(letters[index - 1])
104                 && !char.IsPunctuation(letters[index - 1]) 
105                 && letters[index - 1] != ‘>‘ 
106                 && letters[index - 1] != ‘<‘;
107                 
108 
109         bool lettersThatCannotBeFinishingLetters = letters[index] != ‘ ‘ && letters[index] != (int)IsolatedArabicLetters.Hamza;
110 
111     
112 
113 
114         if(lettersThatCannotBeBeforeAFinishingLetter && lettersThatCannotBeFinishingLetters)
115         {
116             return true;
117         }
118         else
119             return false;
120     }
121 
122     /// <summary>
123     /// Checks if the letter at index value is a middle character in Arabic or not.
124     /// </summary>
125     /// <param name="letters">The whole word that contains the character to be checked</param>
126     /// <param name="index">The index of the character to be checked</param>
127     /// <returns>True if the character at index is a middle character, else, returns false</returns>
128     internal static bool IsMiddleLetter(char[] letters, int index)
129     {
130         bool lettersThatCannotBeMiddleLetters = (index == 0) ? false : 
131             letters[index] != (int)IsolatedArabicLetters.Alef 
132                 && letters[index] != (int)IsolatedArabicLetters.Dal
133                 && letters[index] != (int)IsolatedArabicLetters.Thal 
134                 && letters[index] != (int)IsolatedArabicLetters.Ra2
135                 && letters[index] != (int)IsolatedArabicLetters.Zeen 
136                 && letters[index] != (int)IsolatedArabicLetters.PersianZe 
137                 //&& letters[index] != (int)IsolatedArabicLetters.AlefMaksora
138                 && letters[index] != (int)IsolatedArabicLetters.Waw 
139                 && letters[index] != (int)IsolatedArabicLetters.AlefMad
140                 && letters[index] != (int)IsolatedArabicLetters.AlefHamza 
141                 && letters[index] != (int)IsolatedArabicLetters.AlefMaksoor
142                 && letters[index] != (int)IsolatedArabicLetters.WawHamza 
143                 && letters[index] != (int)IsolatedArabicLetters.Hamza
144                 && letters[index] != (int)IsolatedArabicLetters.Ae
145                 && letters[index] != (int)IsolatedArabicLetters.U
146                 && letters[index] != (int)IsolatedArabicLetters.Yu
147                 && letters[index] != (int)IsolatedArabicLetters.Oe
148                 && letters[index] != (int)IsolatedArabicLetters.Ve;
149 
150         bool lettersThatCannotBeBeforeMiddleCharacters = (index == 0) ? false :
151                 letters[index - 1] != (int)IsolatedArabicLetters.Alef 
152                 && letters[index - 1] != (int)IsolatedArabicLetters.Dal
153                 && letters[index - 1] != (int)IsolatedArabicLetters.Thal 
154                 && letters[index - 1] != (int)IsolatedArabicLetters.Ra2
155                 && letters[index - 1] != (int)IsolatedArabicLetters.Zeen 
156                 && letters[index - 1] != (int)IsolatedArabicLetters.PersianZe 
157                 //&& letters[index - 1] != (int)IsolatedArabicLetters.AlefMaksora
158                 && letters[index - 1] != (int)IsolatedArabicLetters.Waw 
159                 && letters[index - 1] != (int)IsolatedArabicLetters.AlefMad
160                 && letters[index - 1] != (int)IsolatedArabicLetters.AlefHamza 
161                 && letters[index - 1] != (int)IsolatedArabicLetters.AlefMaksoor
162                 && letters[index - 1] != (int)IsolatedArabicLetters.WawHamza 
163                 && letters[index - 1] != (int)IsolatedArabicLetters.Hamza
164                 && letters[index - 1] != (int)IsolatedArabicLetters.Ae
165                 && letters[index - 1] != (int)IsolatedArabicLetters.U
166                 && letters[index - 1] != (int)IsolatedArabicLetters.Yu
167                 && letters[index - 1] != (int)IsolatedArabicLetters.Oe
168                 && letters[index - 1] != (int)IsolatedArabicLetters.Ve
169                 && !char.IsNumber(letters[index - 1])
170                 && !char.IsPunctuation(letters[index - 1])
171                 && letters[index - 1] != ‘>‘ 
172                 && letters[index - 1] != ‘<‘ 
173                 && letters[index - 1] != ‘ ‘ 
174                 && letters[index - 1] != ‘*‘;
175 
176         bool lettersThatCannotBeAfterMiddleCharacters = (index >= letters.Length - 1) ? false :
177             letters[index + 1] != ‘ ‘ 
178                 && letters[index + 1] != ‘\r‘ 
179                 && letters[index + 1] != (int)IsolatedArabicLetters.Hamza
180                 && !char.IsNumber(letters[index + 1])
181                 && !char.IsSymbol(letters[index + 1])
182                 && !char.IsPunctuation(letters[index + 1]);
183         if(lettersThatCannotBeAfterMiddleCharacters && lettersThatCannotBeBeforeMiddleCharacters && lettersThatCannotBeMiddleLetters)
184         {
185             try
186             {
187                 if (char.IsPunctuation(letters[index + 1]))
188                     return false;
189                 else
190                     return true;
191             }
192             catch
193             {
194                 return false;
195             }
196             //return true;
197         }
198         else
199             return false;
200     }