ReportLab有matplotlib可流動嗎？

Question

我想將matplotlib圖表直接嵌入到由ReportLab生成的PDF中 - 即不是先保存爲PNG，然後將PNG嵌入到PDF中（我想我會獲得更好的質量輸出）。

有沒有人知道是否有一個matlablotlib流動ReportLab？

感謝

Answer 1

沒有一個，但我在我自己用MatPlotLib與ReportLab的做的是產生PNG圖像，然後嵌入PNG圖像，這樣我不也需要使用PIL。但是，如果您使用PIL，我相信您應該能夠使用MatPlotLib和ReportLab生成並嵌入EPS。

Answer 2

免費的PDFRW庫適用於將PDF放入reportlab。事實上，有人在使用Matplotlib PDFs解決了這個問題的PDFRW guestbook中有一個註釋。也許是你？

Answer 3

這裏的一個溶液中使用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()