其实搜索一下都有，这个是经典问题之一
搜索

1. self.contents.draw_text(4+@dx, (font_size+10)*@dy, font_size, font_size, c)

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改为

1.     if c == "\001" or c == "\002" or c == "\003" or c == "\n"
   
2.       c = ""
   
3.     else
   
4.       self.contents.draw_text(4+@dx, (font_size+10)*@dy, font_size, font_size, c)
   
5.     end

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