ReportLab 是否有可流动的 matplotlib? [英] Is there a matplotlib flowable for ReportLab?
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问题描述
我想将 matplotlib 图表直接嵌入到 ReportLab 生成的 PDF 中 - 即不要先保存为 PNG,然后再将 PNG 嵌入到 PDF 中(我想我会得到更好的输出质量).
I want to embed matplotlib charts into PDFs generated by ReportLab directly - i.e. not saving as a PNG first and then embedding the PNG into the PDF (i think I'll get better quality output).
有谁知道是否有适用于 ReportLab 的 matplotlib flowable?
Does anyone know if there's a matplotlib flowable for ReportLab?
谢谢
推荐答案
这是使用 pdfrw 的解决方案:
Here's a solution using pdfrw:
#!/usr/bin/env python
# encoding: utf-8
"""matplotlib_example.py
An simple example of how to insert matplotlib generated figures
into a ReportLab platypus document.
"""
import matplotlib
matplotlib.use('PDF')
import matplotlib.pyplot as plt
import cStringIO
from pdfrw import PdfReader
from pdfrw.buildxobj import pagexobj
from pdfrw.toreportlab import makerl
from reportlab.platypus import Flowable
from reportlab.lib.enums import TA_LEFT, TA_CENTER, TA_RIGHT
from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer
from reportlab.lib.styles import getSampleStyleSheet
from reportlab.rl_config import defaultPageSize
from reportlab.lib.units import inch
PAGE_HEIGHT=defaultPageSize[1]; PAGE_WIDTH=defaultPageSize[0]
styles = getSampleStyleSheet()
class PdfImage(Flowable):
"""PdfImage wraps the first page from a PDF file as a Flowable
which can be included into a ReportLab Platypus document.
Based on the vectorpdf extension in rst2pdf (http://code.google.com/p/rst2pdf/)"""
def __init__(self, filename_or_object, width=None, height=None, kind='direct'):
from reportlab.lib.units import inch
# If using StringIO buffer, set pointer to begining
if hasattr(filename_or_object, 'read'):
filename_or_object.seek(0)
page = PdfReader(filename_or_object, decompress=False).pages[0]
self.xobj = pagexobj(page)
self.imageWidth = width
self.imageHeight = height
x1, y1, x2, y2 = self.xobj.BBox
self._w, self._h = x2 - x1, y2 - y1
if not self.imageWidth:
self.imageWidth = self._w
if not self.imageHeight:
self.imageHeight = self._h
self.__ratio = float(self.imageWidth)/self.imageHeight
if kind in ['direct','absolute'] or width==None or height==None:
self.drawWidth = width or self.imageWidth
self.drawHeight = height or self.imageHeight
elif kind in ['bound','proportional']:
factor = min(float(width)/self._w,float(height)/self._h)
self.drawWidth = self._w*factor
self.drawHeight = self._h*factor
def wrap(self, aW, aH):
return self.drawWidth, self.drawHeight
def drawOn(self, canv, x, y, _sW=0):
if _sW > 0 and hasattr(self, 'hAlign'):
a = self.hAlign
if a in ('CENTER', 'CENTRE', TA_CENTER):
x += 0.5*_sW
elif a in ('RIGHT', TA_RIGHT):
x += _sW
elif a not in ('LEFT', TA_LEFT):
raise ValueError("Bad hAlign value " + str(a))
xobj = self.xobj
xobj_name = makerl(canv._doc, xobj)
xscale = self.drawWidth/self._w
yscale = self.drawHeight/self._h
x -= xobj.BBox[0] * xscale
y -= xobj.BBox[1] * yscale
canv.saveState()
canv.translate(x, y)
canv.scale(xscale, yscale)
canv.doForm(xobj_name)
canv.restoreState()
Title = "Hello world"
pageinfo = "platypus example"
def myFirstPage(canvas, doc):
canvas.saveState()
canvas.setFont('Times-Bold',16)
canvas.drawCentredString(PAGE_WIDTH/2.0, PAGE_HEIGHT-108, Title)
canvas.setFont('Times-Roman',9)
canvas.drawString(inch, 0.75 * inch, "First Page / %s" % pageinfo)
canvas.restoreState()
def myLaterPages(canvas, doc):
canvas.saveState()
canvas.setFont('Times-Roman',9)
canvas.drawString(inch, 0.75 * inch, "Page %d %s" % (doc.page, pageinfo))
canvas.restoreState()
def go():
fig = plt.figure(figsize=(4, 3))
plt.plot([1,2,3,4])
plt.ylabel('some numbers')
imgdata = cStringIO.StringIO()
fig.savefig(imgdata,format='PDF')
doc = SimpleDocTemplate("document.pdf")
Story = [Spacer(1,2*inch)]
style = styles["Normal"]
for i in range(5):
bogustext = ("This is Paragraph number %s. " % i) *20
p = Paragraph(bogustext, style)
Story.append(p)
Story.append(Spacer(1,0.2*inch))
pi = PdfImage(imgdata)
Story.append(pi)
Story.append(Spacer(1,0.2*inch))
doc.build(Story, onFirstPage=myFirstPage, onLaterPages=myLaterPages)
if __name__ == '__main__':
go()
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