How to drawImage a matplotlib figure in a reportlab canvas?
Solution for Python 3, and embedding matplotlib figure as a vector image (no rasterization). Reposting here as I searched for this quite some time.
import matplotlib.pyplot as plt
from io import BytesIO
from reportlab.pdfgen import canvas
from reportlab.graphics import renderPDF
from svglib.svglib import svg2rlg
fig = plt.figure(figsize=(4, 3))
plt.plot([1,2,3,4])
plt.ylabel('some numbers')
imgdata = BytesIO()
fig.savefig(imgdata, format='svg')
imgdata.seek(0) # rewind the data
drawing=svg2rlg(imgdata)
c = canvas.Canvas('test2.pdf')
renderPDF.draw(drawing,c, 10, 40)
c.drawString(10, 300, "So nice it works")
c.showPage()
c.save()
svglib is available from conda-forge.
The problem is that drawImage expects either an ImageReader object or a filepath, not a file handle.
The following should work:
import Image
import matplotlib.pyplot as plt
import cStringIO
from reportlab.pdfgen import canvas
from reportlab.lib.units import inch, cm
from reportlab.lib.utils import ImageReader
fig = plt.figure(figsize=(4, 3))
plt.plot([1,2,3,4])
plt.ylabel('some numbers')
imgdata = cStringIO.StringIO()
fig.savefig(imgdata, format='png')
imgdata.seek(0) # rewind the data
Image = ImageReader(imgdata)
c = canvas.Canvas('test.pdf')
c.drawImage(Image, cm, cm, inch, inch)
c.save()