Python使用FPDF導出字體 widths array

1. 新建FontDump工程，import FPDF庫。File ->Setting->Projcet:FontDump->Projcet Interpreter->Double click pip
2. 新建FontDump.py文件，導入庫FPDF
3. 怎麼知道FPDF的所有函數或者說方法呢？看下剛剛下週的庫到我們的工程目錄下D:\Python\FontDump\env\Lib\site-packages\fpdf 有ttfonts.py這個文件，看看這裏面的內容

   class TTFontFile:
   
       def __init__(self):
           self.maxStrLenRead = 200000    # Maximum size of glyf table to read in as string (otherwise reads each glyph from file)
   
       def getMetrics(self, file):
           self.filename = file
           self.fh = open(file,'rb')
           self._pos = 0
           self.charWidths = []
           self.glyphPos = {}
           self.charToGlyph = {}
           self.tables = {}
           self.otables = {}
           self.ascent = 0
           self.descent = 0
           self.TTCFonts = {}
           self.version = version = self.read_ulong()
           if (version==0x4F54544F):
               die("Postscript outlines are not supported")
           if (version==0x74746366):
               die("ERROR - TrueType Fonts Collections not supported")
           if (version not in (0x00010000,0x74727565)):
               die("Not a TrueType font: version=" + version)
           self.readTableDirectory()
           self.extractInfo()
           self.fh.close()
      .....omit.....

   看起來self.charWidths就是我們需要的字體的寬度列表，不過這裏要說的是這是個65536 size的列表

4. 下面是個獲取某種字體寬度的代碼 獲取helvetica.ttf 字體的寬度

   from fpdf.ttfonts import TTFontFile
   import os
   
   def main():
       mypath = "D:\Python\FontDump"
       ttf = TTFontFile()
       #ttffile = os.path.join(mypath,"Arial.ttf")
       ttffile = os.path.join(mypath,"Helvetica.ttf")
       ttf.getMetrics(ttffile)
       widlist = ttf.charWidths
       widlist_len = len(widlist)
       wlx1 = widlist[0:256]
       i_max = (len(wlx1)+1)/8
   
       for i in range(int(i_max)):
           if i > i_max:
               break
           wlx1_tmp = wlx1[i*8:(i+1)*8]
           print(wlx1_tmp)
   
   
   if __name__ == "__main__":
       main()

   輸出：（前提是你要在你這個python文件的所在目錄中放入那個Helvetica.ttf的文件）

   
   [339, 0, 0, 0, 0, 0, 0, 0]
   [0, 0, 0, 0, 0, 0, 0, 0]
   [0, 0, 0, 0, 0, 0, 0, 0]
   [0, 0, 0, 0, 0, 0, 0, 0]
   [278, 278, 355, 556, 556, 889, 667, 191]
   [333, 333, 389, 584, 278, 333, 278, 278]
   [556, 556, 556, 556, 556, 556, 556, 556]
   [556, 556, 278, 278, 584, 584, 584, 556]
   [1015, 667, 667, 722, 722, 667, 611, 778]
   [722, 278, 500, 667, 556, 833, 722, 778]
   [667, 778, 722, 667, 611, 722, 667, 944]
   [667, 667, 611, 278, 278, 278, 469, 556]
   [333, 556, 556, 500, 556, 556, 278, 556]
   [556, 222, 222, 500, 222, 833, 556, 556]
   [556, 556, 333, 500, 278, 556, 500, 722]
   [500, 500, 500, 334, 260, 334, 584, 0]
   [0, 0, 0, 0, 0, 0, 0, 0]
   [0, 0, 0, 0, 0, 0, 0, 0]
   [0, 0, 0, 0, 0, 0, 0, 0]
   [0, 0, 0, 0, 0, 0, 0, 0]
   [278, 333, 556, 556, 556, 556, 260, 556]
   [333, 737, 370, 556, 584, 333, 737, 333]
   [400, 584, 333, 333, 333, 556, 537, 278]
   [333, 333, 365, 556, 834, 834, 834, 611]
   [667, 667, 667, 667, 667, 667, 1000, 722]
   [667, 667, 667, 667, 278, 278, 278, 278]
   [722, 722, 778, 778, 778, 778, 778, 584]
   [778, 722, 722, 722, 722, 667, 667, 611]
   [556, 556, 556, 556, 556, 556, 889, 500]
   [556, 556, 556, 556, 278, 278, 278, 278]
   [556, 556, 556, 556, 556, 556, 556, 584]
   [611, 556, 556, 556, 556, 500, 556, 500]