一旦超过特定宽度，沿空白打破字符串(Python) [英] Breaking a string along whitespace once certain width is exceeded (Python)
问题描述
我在基本图像上渲染文本.
I am rendering text atop a base image.
一个核心要求是当字符的总宽度超过基本图像的宽度时，字符串要换行到下一行.我通过以下正确工作的代码段来完成此操作:
One core requirement is for the string to wrap to the next line(s) whenever the total width of characters exceeds the width of the base image. I accomplish this via the following correctly-working snippet:
base_width, base_height = base_img.size
font = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf", font_size)
line_width = 0
line_count = 1
lines = []
string = ""
for c in text:
line_width += font.getsize(c)[0]
string+=str(c)
if line_width > base_width:
lines.append(string)
string = ""
line_width = 0
line_count += 1
if string:
lines.append(string)
结果 lines 是通过分解原始字符串得到的子字符串列表.
The result lines is a list of substrings gotten via breaking up the original string.
现在我需要改进这个算法.
Now I need to improve this algorithm.
问题在于它打破了中间词.例如.字符串 lorem ipsum 可能以 lines = ['lorem ip','sum'] 结尾.相反，对我来说理想的分解是更具人类可读性的 lines = ['lorem ','ipsum'] 或 lines = ['lorem',' ipsum'].
The problem is that it breaks the line mid-word. E.g. The string lorem ipsum could end up as lines = ['lorem ip','sum']. Instead, the ideal break-up for me is the much more human readable lines = ['lorem ','ipsum'], or lines = ['lorem',' ipsum'].
换句话说，我想沿着空格而不是中间词来打破线条.有人能给我一个说明性的例子来说明我如何做到这一点吗?似乎无法绕过它.
In other words, I want to break the lines along white spaces, and not mid-word. Can someone give me an illustrative example of how I can accomplish that? Can't seem to wrap my head around it.
推荐答案
这里尝试让您的代码以最少的更改和大量的调试输出工作:
Here's an attempt to get your code working with minimal changes, and lots of debug output:
#!python3
#coding=utf-8
""" Line break demo 2 """
text = "lorem ipsum dolor sit amet blablah"
for wmax in [10,25,55,80,100,120]:
print(wmax)
base_width, base_height = (wmax,None)#base_img.size
#font = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf", font_size)
line_width = 0
line_count = 1
lines = []
string = ""
for c in text:
line_width += 5#font.getsize(c)[0]
string += c
if line_width > base_width:
print("text ", text)
print("string", string)
s = string.rsplit(" ", 1)
print("split ", s)
string = s[0]
lines.append(string)
try:
string = s[1]
line_width = len(string) * 5
except:
string = ""
line_width = 0
print("lines ", lines)
print("string", string)
line_count += 1
print()
if string:
lines.append(string)
print(lines)
print()
输出:
10
text lorem ipsum dolor sit amet blablah
string lor
split ['lor']
lines ['lor']
string
text lorem ipsum dolor sit amet blablah
string em
split ['em', '']
lines ['lor', 'em']
string
text lorem ipsum dolor sit amet blablah
string ips
split ['ips']
lines ['lor', 'em', 'ips']
string
text lorem ipsum dolor sit amet blablah
string um
split ['um', '']
lines ['lor', 'em', 'ips', 'um']
string
text lorem ipsum dolor sit amet blablah
string dol
split ['dol']
lines ['lor', 'em', 'ips', 'um', 'dol']
string
text lorem ipsum dolor sit amet blablah
string or
split ['or', '']
lines ['lor', 'em', 'ips', 'um', 'dol', 'or']
string
text lorem ipsum dolor sit amet blablah
string sit
split ['sit']
lines ['lor', 'em', 'ips', 'um', 'dol', 'or', 'sit']
string
text lorem ipsum dolor sit amet blablah
string am
split ['', 'am']
lines ['lor', 'em', 'ips', 'um', 'dol', 'or', 'sit', '']
string am
text lorem ipsum dolor sit amet blablah
string ame
split ['ame']
lines ['lor', 'em', 'ips', 'um', 'dol', 'or', 'sit', '', 'ame']
string
text lorem ipsum dolor sit amet blablah
string t b
split ['t', 'b']
lines ['lor', 'em', 'ips', 'um', 'dol', 'or', 'sit', '', 'ame', 't']
string b
text lorem ipsum dolor sit amet blablah
string bla
split ['bla']
lines ['lor', 'em', 'ips', 'um', 'dol', 'or', 'sit', '', 'ame', 't', 'bla']
string
text lorem ipsum dolor sit amet blablah
string bla
split ['bla']
lines ['lor', 'em', 'ips', 'um', 'dol', 'or', 'sit', '', 'ame', 't', 'bla', 'bla
string
['lor', 'em', 'ips', 'um', 'dol', 'or', 'sit', '', 'ame', 't', 'bla', 'bla', 'h']
25
text lorem ipsum dolor sit amet blablah
string lorem
split ['lorem', '']
lines ['lorem']
string
text lorem ipsum dolor sit amet blablah
string ipsum
split ['ipsum', '']
lines ['lorem', 'ipsum']
string
text lorem ipsum dolor sit amet blablah
string dolor
split ['dolor', '']
lines ['lorem', 'ipsum', 'dolor']
string
text lorem ipsum dolor sit amet blablah
string sit am
split ['sit', 'am']
lines ['lorem', 'ipsum', 'dolor', 'sit']
string am
text lorem ipsum dolor sit amet blablah
string amet b
split ['amet', 'b']
lines ['lorem', 'ipsum', 'dolor', 'sit', 'amet']
string b
text lorem ipsum dolor sit amet blablah
string blabla
split ['blabla']
lines ['lorem', 'ipsum', 'dolor', 'sit', 'amet', 'blabla']
string
['lorem', 'ipsum', 'dolor', 'sit', 'amet', 'blabla', 'h']
55
text lorem ipsum dolor sit amet blablah
string lorem ipsum
split ['lorem ipsum', '']
lines ['lorem ipsum']
string
text lorem ipsum dolor sit amet blablah
string dolor sit am
split ['dolor sit', 'am']
lines ['lorem ipsum', 'dolor sit']
string am
text lorem ipsum dolor sit amet blablah
string amet blablah
split ['amet', 'blablah']
lines ['lorem ipsum', 'dolor sit', 'amet']
string blablah
['lorem ipsum', 'dolor sit', 'amet', 'blablah']
80
text lorem ipsum dolor sit amet blablah
string lorem ipsum dolor
split ['lorem ipsum', 'dolor']
lines ['lorem ipsum']
string dolor
text lorem ipsum dolor sit amet blablah
string dolor sit amet bl
split ['dolor sit amet', 'bl']
lines ['lorem ipsum', 'dolor sit amet']
string bl
['lorem ipsum', 'dolor sit amet', 'blablah']
100
text lorem ipsum dolor sit amet blablah
string lorem ipsum dolor sit
split ['lorem ipsum dolor', 'sit']
lines ['lorem ipsum dolor']
string sit
['lorem ipsum dolor', 'sit amet blablah']
120
text lorem ipsum dolor sit amet blablah
string lorem ipsum dolor sit ame
split ['lorem ipsum dolor sit', 'ame']
lines ['lorem ipsum dolor sit']
string ame
['lorem ipsum dolor sit', 'amet blablah']
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