Question

我曾经为一个使用Prince XML生成PDF文档的组织工作。该组织已经折叠，我不再能够访问该Prince许可证。由于我在沙发垫之间没有四个盛大，我一直在尝试使用WeasyPrint将HTML发票呈现为PDF。我的HTML＆amp; CSS非常简单，所以Weasy可以准确地呈现它们，但需要注意。我不能让页面自动缩小到纸张大小，就像在王子中使用：

@page {
prince-shrink-to-fit:auto;
}

在重新编写整个网站的CSS以生成较小的文档之前，有没有人知道Weasy是否支持任何类似的命令？

Answer 1

通过浏览一些想法来格式化weasyprint提供的pdf格式，我发现这个问题可能会回答你的问题。

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WeasyPrint page size wrong. (8.27in x 11.69 in)

Answer 2

WeasyPrint目前不支持此类内容。 Prince’s documentation完全没有做什么。如何确定“内容的宽度”？鉴于该功能的正确规范，我可以说明添加到WeasyPrint有多难。

顺便说一句，我通常不会在WeasyPrint问题上看StackOverflow。写入WeasyPrint的邮件列表或问题跟踪器将获得更多响应。

Answer 3

如果您要打印熊猫数据框，这可能会有所帮助

from typing import Callable
import pandas as pd
import weasyprint as wp


def html_basic(df: pd.DataFrame) -> str:
    # Using df.style.render outputs an id in every cell,
    # whilst using df.to_html doesn't.
    return df.style.render()


def write_pdf_autofit(df: pd.DataFrame,
                      preamble: str,
                      fn_df_to_html: Callable[[pd.DataFrame], str]=html_basic
                      ) -> bytes:
    template = f"""<html><body>{preamble}{{table}}</body></html>"""

    # Render on a very long page so that there's no pagination.
    # Width doesn't matter, because overflow is allowed on width.
    mycss = wp.CSS(string=(
        "@page longpage {\n"
        "    size: 210mm 10000mm;\n"
        "}"
        "body {\n"
        "   page: longpage;\n"
        "}\n"
    ))

    # Create a copy of the dataframe with a dummy final column,
    # so that we can get the position of the left side of the
    # dummy column which is the right side of the final real column.
    # Then do a test render to find the positions of stuff.
    df_tmp = df.copy()
    df_tmp['x'] = np.nan
    test_html = template.format(table=fn_df_to_html(df_tmp))
    test_render = wp.HTML(string=test_html).render(stylesheets=[mycss])
    test_page1: wp.Page = test_render.pages[0]

    # I'm not sure why only need to subtract one margin,
    # but seems to work.
    printable_width = test_page1.width - test_page1._page_box.margin_left
    printable_height = 11.7 * 96 - test_page1._page_box.margin_top

    # All the cells in the html rendered DataFrame
    # have an id so are anchors, so just find the
    # max x and y from all the anchors.
    max_x, max_y = map(max, *test_page1.anchors.values())
    zoom_pct = 1
    if max_x > printable_width or max_y > printable_height:
        zoom_pct = min([printable_width / max_x,
                        printable_height / max_y])

    # Increase the page size to fit the table, then
    # we will zoom out the write_pdf to fit standard page size.
    # A4 = 210mm x 297mm
    mycss = wp.CSS(string=(
        "@page scaled {\n"
        f"    size: {210 / zoom_pct}mm {297 / zoom_pct}mm;\n"
        "}"
        "body {\n"
        "   page: scaled;\n"
        "}\n"
    ))

    html = template.format(table=fn_df_to_html(df))
    pdf_bytes = wp.HTML(string=html).write_pdf(zoom=zoom_pct,
                                               stylesheets=[mycss])
    return pdf_bytes


if __name__ == "__main__":
    import numpy as np
    DF = pd.DataFrame(np.random.randint(0, 100, size=(100, 4)), columns=list('ABCD'))
    with open(r'c:\temp\x.pdf', 'wb') as f:
        f.write(write_pdf_autofit(DF, ""))

We WeasyPrint可以自动适合纸张尺寸

3 个答案: