Reportlab 如何向已经存在 pdf 中的指定位置插入一个饼状图

我尝试使用 PyPDF2 和 Reportlab 向一个已经存在的 pdf 中的指定位置插入一个由 reportlab 生成的饼状图，但是我看的时候只看到使用 reportlab 的 canvas 向其中写入字符串，图片啥的，没看到写入一个 pie 对象，是要将这个 pie 对象转成图片然后再插入吗,我参考的是这个代码,先感谢各位大佬的教育

from PyPDF2 import PdfFileWriter, PdfFileReader
import io
from reportlab.pdfgen import canvas
from reportlab.lib.pagesizes import letter

packet = io.BytesIO()
# create a new PDF with Reportlab
can = canvas.Canvas(packet, pagesize=letter)
can.drawString(10, 100, "Hello world")
can.save()

#move to the beginning of the StringIO buffer
packet.seek(0)
new_pdf = PdfFileReader(packet)
# read your existing PDF
existing_pdf = PdfFileReader(open("original.pdf", "rb"))
output = PdfFileWriter()
# add the "watermark" (which is the new pdf) on the existing page
page = existing_pdf.getPage(0)
page.mergePage(new_pdf.getPage(0))
output.addPage(page)
# finally, write "output" to a real file
outputStream = open("destination.pdf", "wb")
output.write(outputStream)
outputStream.close()

reportlab

PDF

import

canvas

2 条回复 • 2020-11-13 13:19:33 +08:00

lanceadd

2020-11-13 11:55:45 +08:00

我会了
```
import io

from PyPDF2 import PdfFileReader, PdfFileWriter
from reportlab.graphics import renderPDF
from reportlab.graphics.charts.piecharts import Pie
from reportlab.graphics.shapes import Drawing
from reportlab.lib.pagesizes import A4
from reportlab.pdfgen import canvas

packet = io.BytesIO()

can = canvas.Canvas(packet, pagesize=A4)

pie = Pie()
pie.data = [20, 10, 5, 5, 5]
pie.labels = ['a', 'b', 'c', 'd', 'e']
pie.sideLabels = True

d = Drawing(100, 100)
d.add(pie)
renderPDF.draw(d, can, 20, 20)
can.save()
packet.seek(0)
new_pdf = PdfFileReader(packet)

existing_pdf = PdfFileReader(open('example_06.pdf', 'rb'))
output = PdfFileWriter()
page = existing_pdf.getPage(0)
page.mergePage(new_pdf.getPage(0))
output.addPage(page)
outputStream = open('result.pdf', 'wb')
output.write(outputStream)
outputStream.close()

```

renmu123

2020-11-13 13:19:33 +08:00 via Android

提示一下，pypdf2 已经停止维护了，可以试试 pypdf4 （虽然也快了