Python 如何将 matplotlib 图表集成进到PDF 中

$ pip install borb

$ pip install matplotlib

from borb.pdf.canvas.color.color import HSVColor, HexColor
from decimal import Decimal
import typing
 
def create_n_colors(n: int) -> typing.List[str]:
  # The base color is borb-blue
  base_hsv_color: HSVColor = HSVColor.from_rgb(HexColor("56cbf9"))
  # This array comprehension creates n HSVColor objects, transforms then to RGB, and then returns their hex string
  return [HSVColor(base_hsv_color.hue + Decimal(x / 360), Decimal(1), Decimal(1)).to_rgb().to_hex_string() for x in range(0, 360, int(360/n))]

# New import(s)
import matplotlib.pyplot as plt
from borb.pdf.canvas.layout.image.chart import Chart
from borb.pdf.canvas.layout.layout_element import Alignment
 
def create_piechart(labels: typing.List[str], data: typing.List[float]):
 
  # Symetric figure to ensure equal aspect ratio
  fig1, ax1 = plt.subplots(figsize=(4, 4))
  ax1.pie(
    data,
    explode=[0 for _ in range(0, len(labels))],
    labels=labels,
    autopct="%1.1f%%",
    shadow=True,
    startangle=90,
    colors=create_n_colors(len(labels)),
  )
 
  ax1.axis("equal")  # Equal aspect ratio ensures that pie is drawn as a circle.
 
  return Chart(
    plt.gcf(),
    width=Decimal(200),
    height=Decimal(200),
    horizontal_alignment=Alignment.CENTERED,
  )

# New import(s)
from borb.pdf.document import Document
from borb.pdf.page.page import Page
from borb.pdf.pdf import PDF
from borb.pdf.canvas.layout.page_layout.multi_column_layout import MultiColumnLayout
from borb.pdf.canvas.layout.page_layout.page_layout import PageLayout
from borb.pdf.canvas.layout.text.paragraph import Paragraph
 
# Create empty Document
pdf = Document()
 
# Create empty Page
page = Page()
 
# Add Page to Document
pdf.append_page(page)
 
# Create PageLayout
layout: PageLayout = MultiColumnLayout(page)
 
# Write title
layout.add(Paragraph("About Lorem Ipsum", 
                     font_size=Decimal(20), 
                     font="Helvetica-Bold"))

# New import(s)
from borb.pdf.canvas.layout.hyphenation.hyphenation import Hyphenation
 
# Create hyphenation algorithm
hyphenation_algorithm: Hyphenation = Hyphenation("en-gb")
 
# Write paragraph
layout.add(Paragraph(
    """
    Lorem Ipsum is simply dummy text of the printing and typesetting industry. 
    Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, 
    when an unknown printer took a galley of type and scrambled it to make a type specimen book. 
    It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. 
    It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, 
    and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
    """, text_alignment=Alignment.JUSTIFIED, hyphenation=hyphenation_algorithm))

# Write graph
layout.add(create_piechart(["Loren", "Ipsum", "Dolor"], 
                           [0.6, 0.3, 0.1]))

# Write paragraph
layout.add(Paragraph(
    """
    Contrary to popular belief, Lorem Ipsum is not simply random text. 
    It has roots in a piece of classical Latin literature from 45 BC, making it over 2000 years old. 
    Richard McClintock, a Latin professor at Hampden-Sydney College in Virginia, looked up one of the more obscure Latin words, 
    consectetur, from a Lorem Ipsum passage, and going through the cites of the word in classical literature, 
    discovered the undoubtable source.
    """, text_alignment=Alignment.JUSTIFIED, hyphenation=hyphenation_algorithm))
 
# Write paragraph
layout.add(Paragraph(
    """
    Lorem Ipsum is simply dummy text of the printing and typesetting industry. 
    """, 
    font="Courier-Bold",
    text_alignment=Alignment.JUSTIFIED, 
    hyphenation=hyphenation_algorithm,
    border_color=HexColor("56cbf9"),
    border_width=Decimal(3),
    border_left=True,
    padding_left=Decimal(5),
    padding_bottom=Decimal(5),
))
 
# Write paragraph
layout.add(Paragraph(
    """
    Lorem Ipsum comes from sections 1.10.32 and 1.10.33 of "de Finibus Bonorum et Malorum" 
    (The Extremes of Good and Evil) by Cicero, written in 45 BC. 
    This book is a treatise on the theory of ethics, very popular during the Renaissance.
    """, text_alignment=Alignment.JUSTIFIED, hyphenation=hyphenation_algorithm))

# Write graph
layout.add(create_piechart(["Loren", "Ipsum", "Dolor", "Sit", "Amet"], 
                           [600, 30, 89, 100, 203]))

# Write paragraph
layout.add(Paragraph(
    """
    It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout. 
    The point of using Lorem Ipsum is that it has a more-or-less normal distribution of letters, as opposed to using 'Content here, content here', 
    making it look like readable English. Many desktop publishing packages and web page editors now use Lorem Ipsum as their default model text, 
    and a search for 'lorem ipsum' will uncover many web sites still in their infancy. 
    Various versions have evolved over the years, sometimes by accident, sometimes on purpose (injected humour and the like).
    """, text_alignment=Alignment.JUSTIFIED, hyphenation=hyphenation_algorithm))

# Write to disk
with open("output.pdf", "wb") as pdf_file_handle:
  PDF.dumps(pdf_file_handle, pdf)