[reportlab 教程(5)]——reportlab生成pdf的中文自动换行

Django 利用 reportlab 生成中文 PDF Django 可以通过 reportlab 生成pdf，并以附件的形式返回给客户端，但是 reportlab 生成中文的pdf还需要字体和换行的设置。具体例子如下：

#!/usr/bin/python
# -*- coding:utf-8 -*-

from django.http import HttpResponse
from cStringIO import StringIO
from reportlab.pdfgen import canvas
from reportlab import rl_config
from reportlab.pdfbase import pdfmetrics
from reportlab.pdfbase.ttfonts import TTFont
from reportlab.lib.units import inch
from reportlab.lib.utils import simpleSplit
from reportlab.lib.styles import getSampleStyleSheet
from reportlab.platypus import Paragraph
from reportlab.lib.fonts import addMapping

def hello_pdf(request):
rl_config.warnOnMissingFontGlyphs = 0
pdfmetrics.registerFont(TTFont('song', '/home/yisl04/.fonts/simsun.ttc'))
pdfmetrics.registerFont(TTFont('fs', '/home/yisl04/.fonts/simfang.ttf'))
pdfmetrics.registerFont(TTFont('hei', '/home/yisl04/.fonts/simhei.ttf'))
pdfmetrics.registerFont(TTFont('yh', '/home/yisl04/.fonts/msyh.ttf'))

#设置字体：常规、斜体、粗体、粗斜体
addMapping('cjk', 0, 0, 'song')    #normal
addMapping('cjk', 0, 1, 'fs')    #italic
addMapping('cjk', 1, 0, 'hei')    #bold
addMapping('cjk', 1, 1, 'yh')    #italic and bold

response = HttpResponse(mimetype='application/pdf')
response['Content-Disposition'] = 'attachment; filename=hello.pdf'

temp = StringIO()
p = canvas.Canvas(temp)

#默认(0, 0)点在左下角，此处把原点(0,0)向上和向右移动，后面的尺寸都是相对与此原点设置的
#注意：移动原点时，向右向上为正，坐标系也是向右为+x，向上为+y
p.translate(0.5*inch, 0.5*inch)
#设置字体
p.setFont('song', 16)
#设置颜色，画笔色和填充色
p.setStrokeColorRGB(0.2, 0.5, 0.3)
p.setFillColorRGB(1, 0, 1)
#画一个矩形
p.rect(0, 0, 3*inch, 3*inch, fill=1)
#旋转文字方向
p.rotate(90)
p.setFillColorRGB(0, 0, 0.77)
p.drawString(3*inch, -3*inch, u"我是吴仁智，呵呵！")
p.rotate(-90)
p.setFont('yh', 16)
p.drawString(0, 0, u"drawString默认不换行！")
#插入图片
p.drawImage("/home/yisl04/public_html/yisl04.png", 5*inch, 5*inch, inch, inch)
#设置drawString最大宽度
L = simpleSplit(u'simpleSplit 只能用于 drawString 英文断行。', 'yh', 16, 9*inch)
y = 9*inch
for t in L:
p.drawString(0, y, t)
y -= p._leading

#Paragraph下中文断行(网上摘抄)
def wrap(self, availWidth, availHeight):
# work out widths array for breaking
self.width = availWidth
leftIndent = self.style.leftIndent
first_line_width = availWidth - (leftIndent+self.style.firstLineIndent) - self.style.rightIndent
later_widths = availWidth - leftIndent - self.style.rightIndent
try:
self.blPara = self.breakLinesCJK([first_line_width, later_widths])
except:
self.blPara = self.breakLines([first_line_width, later_widths])
self.height = len(self.blPara.lines) * self.style.leading
return (self.width, self.height)
Paragraph.wrap = wrap

#中文断行还可以使用下面这种简单的方法
#from reportlab.lib.styles import ParagraphStyle
#ParagraphStyle.defaults['wordWrap']="CJK"

styleSheet = getSampleStyleSheet()
style = styleSheet['BodyText']
style.fontName = 'song'
style.fontSize = 16
#设置行距
style.leading = 20
#首行缩进
style.firstLineIndent = 32
Pa = Paragraph(u'<b>这里是粗体</b>，<i>这里是斜体</i>, <strike>这是删除线</strike>, <u>这是下划线</u>, <sup>这是上标</sup>, <em>这里是强调</em>, <font color=#ff0000>这是红色</font>', style)

Pa.wrapOn(p, 6*inch, 8*inch)
Pa.drawOn(p, 0, 5*inch)

p.showPage()
p.save()
response.write(temp.getvalue())
return response
转自：http://wiki.woodpecker.org.cn/moin/MiscItems/2010-07-09