我正在使用 ReportLab 使用 python 动态生成 pdf。
我希望一行文本位于页面中央。这是我目前拥有的具体代码,但不知道如何使文本水平居中。
header = p.beginText(190, 740)
header.textOut("Title of Page Here")
# I know i can use TextLine etc in place of textOut
p.drawText(header)
文本显示,我可以手动移动左侧位置,使文本看起来居中,但我需要以编程方式居中,因为文本将是动态的,我不知道会有多少文本。
reportlab 画布有一个 drawCentredString 方法。是的,他们就是这样拼写的。
我们是英国人,该死,并为此感到自豪 我们的拼写!
编辑: 至于文本对象,恐怕你不知道。不过,您可以按照这些思路做一些事情:
from reportlab.pdfbase.pdfmetrics import stringWidth
from reportlab.rl_config import defaultPageSize
PAGE_WIDTH = defaultPageSize[0]
PAGE_HEIGHT = defaultPageSize[1]
text = "foobar foobar foobar"
text_width = stringWidth(text)
y = 1050 # wherever you want your text to appear
pdf_text_object = canvas.beginText((PAGE_WIDTH - text_width) / 2.0, y)
pdf_text_object.textOut(text) # or: pdf_text_object.textLine(text) etc.
显然,您可以使用其他页面尺寸。
我也需要这个,所以写了这个:
def createTextObject(canv, x, y, text, style, centered=False):
font = (style.fontName, style.fontSize, style.leading)
lines = text.split("\n")
offsets = []
if centered:
maxwidth = 0
for line in lines:
offsets.append(canv.stringWidth(line, *font[:2]))
maxwidth = max(*offsets)
offsets = [(maxwidth - i)/2 for i in offsets]
else:
offsets = [0] * len(lines)
tx = canv.beginText(x, y)
tx.setFont(*font)
for offset, line in zip(offsets, lines):
tx.setXPos(offset)
tx.textLine(line)
tx.setXPos(-offset)
return tx
您可以使用像
Paragraph
这样的Flowable对象并将alignment
值分配给1:
styles = getSampleStyleSheet()
title_style = styles['Heading1']
title_style.alignment = 1
title = Paragraph("Hello Reportlab", title_style)
story.append(title)
此示例将创建一个文本居中的 pdf 文档:
from flask import make_response
import io
from reportlab.platypus import SimpleDocTemplate, Paragraph
from reportlab.lib.styles import getSampleStyleSheet
story=[]
pdf_doc = io.BytesIO()
doc = SimpleDocTemplate(pdf_doc)
styles = getSampleStyleSheet()
title_style = styles['Heading1']
title_style.alignment = 1
title = Paragraph("Hello Reportlab", title_style)
story.append(title)
doc.build(story)
content = pdf_doc.getvalue()
#output to browser
response = make_response(content)
response.mimetype = 'application/pdf'
return response
如果想让文字向左浮动,需要将
alignment
改为0:
title_style.alignment = 0
如果想让文字向右浮动,需要将
alignment
改为2:
title_style.alignment = 2
尝试:
<para alignment="center">
根据参考:http://two.pairlist.net/pipermail/reportlab-users/2006-June/005092.html
您的情况:
header.textOut("<"para alignment='center'>"Title of Page Here")
from reportlab.lib.pagesizes import letter
from reportlab.platypus import SimpleDocTemplate, Paragraph
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
doc = SimpleDocTemplate("form_letter.pdf",pagesize=letter,
rightMargin=72,leftMargin=72,
topMargin=72,bottomMargin=18)
Story = []
styles = getSampleStyleSheet()
title_style = styles['Heading1']
title_style.alignment = 1
title = Paragraph("Welcome to india", title_style)
Story.append(title)
doc.build(Story)