Python实现点阵字体读取与转换的方法

Python  /  管理员 发布于 7年前   301

点阵字体是指根据文字的像素点来显示的字体，效果如下：

使用Python读取并显示的过程如下：

根据中文字符获取GB2312编码

通过GB2312编码计算该汉字在点阵字库中的区位和码位

通过区位和码位计算在点阵字库中的偏移量

基于偏移量获取该汉字的32个像素存储字节

解析像素字节获取点阵坐标信息

在对应的坐标显示信息位。如该像素点是否显示点亮

使用该代码前提：下载点阵字体库到本地，这里默认使用的是hzk16点阵字库

代码如下：

#!/usr/bin/python#encoding: utf-8import binascii RECT_HEIGHT = 16RECT_WIDTH = 16BYTE_COUNT_PER_ROW = RECT_WIDTH / 8BYTE_COUNT_PER_FONT = BYTE_COUNT_PER_ROW * RECT_HEIGHT KEYS = [0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01] class FontRender(object): def __init__(self, font_file,  rect_height=RECT_HEIGHT, rect_width=RECT_WIDTH, byte_count_per_row=BYTE_COUNT_PER_ROW): self.font_file = font_file self.rect_height = rect_height self.rect_width = rect_width self.byte_count_per_row = byte_count_per_row  self.__init_rect_list__()  def __init_rect_list__(self): self.rect_list = [] * RECT_HEIGHT  for i in range(RECT_HEIGHT): self.rect_list.append([] * RECT_WIDTH)  def get_font_area_index(self, txt, encoding='utf-8'): if not isinstance(txt, unicode): txt = txt.decode(encoding)  gb2312 = txt.encode('gb2312') hex_str = binascii.b2a_hex(gb2312)  area = eval('0x' + hex_str[:2]) - 0xA0 index = eval('0x' + hex_str[2:]) - 0xA0  return area, index  def get_font_rect(self, area, index): offset = (94 * (area-1) + (index-1)) * BYTE_COUNT_PER_FONT btxt = None  with open(self.font_file, "rb") as f: f.seek(offset) btxt = f.read(BYTE_COUNT_PER_FONT)  return btxt  def convert_font_rect(self, font_rect, ft=1, ff=0): for k in range(len(font_rect) / self.byte_count_per_row): row_list = self.rect_list[k] for j in range(self.byte_count_per_row): for i in range(8):  asc = binascii.b2a_hex(font_rect[k * self.byte_count_per_row + j])  asc = eval('0x' + asc)  flag = asc & KEYS[i]  row_list.append(flag and ft or ff)  def render_font_rect(self, rect_list=None): if not rect_list: rect_list = self.rect_list  for row in rect_list: for i in row: if i:  print '■', else:  print '○', print  def convert(self, text, ft=None, ff=None, encoding='utf-8'): if not isinstance(text, unicode): text = text.decode(encoding)  for t in text: area, index = self.get_font_area_index(t) font_rect = self.get_font_rect(area, index)  self.convert_font_rect(font_rect, ft=ft, ff=ff)  def get_rect_info(self): return self.rect_list if '__main__' == __name__: text = u'同创伟业' fr = FontRender('./font/16x16/hzk16h') fr.convert(text, ft='/static/*', ff=0) # print fr.get_rect_info() fr.render_font_rect()

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