视觉长度截断函数

最新推荐文章于 2023-08-22 10:18:17 发布

最新推荐文章于 2023-08-22 10:18:17 发布 · 187 阅读

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本文介绍了一种用于计算中文字符串显示宽度的方法，通过分析字符编码来确定每个字符的可视宽度，并提供了具体的实现算法。该算法适用于需要精确控制文本显示长度的应用场景。

#长度的来源见附件中的html

_visable_width=0, 24, 24, 24, 24, 24, 24, 24, 24, 0, 0, 0, 0, 0, 24,
24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
12, 12, 16, 28, 28, 44, 32, 8, 16, 16, 20, 28, 12, 16, 12, 12, 28, 28,
28, 28, 28, 28, 28, 28, 28, 28, 12, 12, 28, 28, 28, 28, 48, 28, 32,
36, 36, 32, 28, 36, 36, 12, 24, 32, 28, 36, 36, 36, 32, 36, 36, 32,
28, 36, 28, 44, 28, 28, 28, 12, 12, 12, 20, 28, 16, 28, 28, 24, 28,
28, 12, 28, 28, 12, 12, 24, 12, 44, 28, 28, 28, 28, 16, 28, 12, 28,
20, 36, 20, 20, 20, 16, 12, 16, 28, 24
#中文长48

def visable_length(word):
length=len(word)
width=0
i=0
while i<length:
c=word[i]
if c>"\xE0" and c<="\xEF":
i+=3
width+=48
else:
if c<"\xC0":
i+=1
width+=_visable_width[ord(c)]
else:
width+=48
if c<="\xDF":i+=2
elif c<="\xF7":i+=4
elif c<="\xFB":i+=5
else:i+=6
return width

def visable_cut(word,limit,etc="..."):
i=0
length=len(word)
if length<=limit:return word
limit = limit*48
width = 0
while i<length:
c=word[i]
if c>"\xE0" and c<="\xEF":
offset=3
width+=48
else:
if c<"\xC0":
offset=1
width+=_visable_width[ord(c)]
else:
width+=48
if c<="\xDF":offset=2
elif c<="\xF7":offset=4
elif c<="\xFB":offset=5
else:offset=6
if width>limit:
etc_length=(48+visable_length(etc))/48
return word[:i-etc_length]+etc
else:
i+=offset
return word