2

我在 google colab 中使用散景创建了一个图表，并希望将其嵌入到 PDF 中（作为 jinja2 模板的一部分）。Jinja2 html 输出显示在 pdf 中，散景图除外。

当我尝试只转换散景图时，我只得到一个空白页：

from weasyprint import HTML

HTML('bokeh-test.html').write_pdf("report3.pdf")

有没有办法让 Weasyprint 与 Bokeh 的 html 输出一起工作？我正在使用 google-colab，所以我可以安装的内容是有限的。我使用https://www.sejda.com/html-to-pdf将 html 转换为 pdf 并显示图表。

散景图html输出： 

<!DOCTYPE html>
<html lang="en">
  
  <head>
    
      <meta charset="utf-8">
      <title>Bokeh Plot</title>
      
      
        
          
        <link rel="stylesheet" href="https://cdn.bokeh.org/bokeh/release/bokeh-0.13.0.min.css" type="text/css" />
        
        
          
        <script type="text/javascript" src="https://cdn.bokeh.org/bokeh/release/bokeh-0.13.0.min.js"></script>
        <script type="text/javascript">
            Bokeh.set_log_level("info");
        </script>
        
      
      
    
  </head>
  
  
  <body>
    
      
        
          
          
            <div class="bk-root" id="ef113f06-aa36-4375-be30-7e11ddafa77a"></div>
          
        
      
      
        <script type="application/json" id="4ee5c914-fee4-4720-8c61-acaf6a1f5e0b">
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Application","version":"0.13.0"}}
        </script>
        <script type="text/javascript">
          (function() {
            var fn = function() {
              Bokeh.safely(function() {
                (function(root) {
                  function embed_document(root) {
                    
                  var docs_json = document.getElementById('4ee5c914-fee4-4720-8c61-acaf6a1f5e0b').textContent;
                  var render_items = [{"docid":"57a9d4e3-e61b-42d1-9e38-2d3437421187","roots":{"68a2a747-e658-4f80-bc64-925e7307eafe":"ef113f06-aa36-4375-be30-7e11ddafa77a"}}];
                  root.Bokeh.embed.embed_items(docs_json, render_items);
                
                  }
                  if (root.Bokeh !== undefined) {
                    embed_document(root);
                  } else {
                    var attempts = 0;
                    var timer = setInterval(function(root) {
                      if (root.Bokeh !== undefined) {
                        embed_document(root);
                        clearInterval(timer);
                      }
                      attempts++;
                      if (attempts > 100) {
                        console.log("Bokeh: ERROR: Unable to run BokehJS code because BokehJS library is missing")
                        clearInterval(timer);
                      }
                    }, 10, root)
                  }
                })(window);
              });
            };
            if (document.readyState != "loading") fn();
            else document.addEventListener("DOMContentLoaded", fn);
          })();
        </script>
    
  </body>
  
</html>

4

2 回答 2

1

散景图实际上是渲染到 HTML 画布、响应和处理 UI 事件的 JavaScript 应用程序。PDF 无法直接执行任何操作，因为它们无法运行 JavaScript 代码。我非常怀疑任何程序化的 HTML 到 PDF 工具都可以用它做任何有用的事情。AFAIK 您最好的选择是使用Bokeh 的导出 API显式导出 PNG ：

from bokeh.io import export_png

export_png(plot, filename="plot.png")

还有一种模式可以在浏览器中生成 SVG，HTML-to-PDF 工具可能能够转换这种输出：

plot.output_backend = "svg"

但是，从 Bokeh 0.13 开始，Bokeh 中的 SVG 输出存在一些限制和已知问题。您只需尝试一下，看看它是否适合您的特定用例。

于 2018-08-09T14:51:43.090 回答
0

我已经使用这个（非常粗略的）代码进行 HTML 到 PDF 的转换，它通常适用于相当复杂的模板化布局，其中嵌入了散景图。有两个引擎：

  1. 使用本地安装的无头铬（您可以使铬成为您的 Google Chrome 可执行文件的别名或为路径创建新的函数参数）。
  2. sejda webservice API，它不需要任何本地安装（除了pip install requests），但需要一个免费帐户来获取令牌，并且文档大小似乎有 25 MB 的上限。
import os
import subprocess
import tempfile as tmp

import requests

def html_to_pdf(document, compress=False, engine='chromium',
                url='https://api.sejda.com/v2/html-pdf', token=None,
                webservice_options=None):
    """
    Convert html to pdf using headless chromium or sejda webservice.

    Optionally compress with ghostscript (also needs to be installed) if using chromium. For webservice_options,
    see https://www.sejda.com/developers#html-pdf-api for docs.

    Parameters
    ----------
    document: string
        Full html document to render.

    Returns
    -------
    pdf: bytes
        The rendered pdf document as a bytestring.

    Notes
    -----
    Unfortunately requires disk (temporary files) when using chromium engine.

    """
    if webservice_options is None:
        webservice_options = {}
    if engine == 'sejda':
        payload = {'htmlCode': document, **webservice_options}
        response = requests.post(url, json=payload, headers={'Authorization': f'Token: {token}'})
        response.raise_for_status()
        static_bytes = response.content
    elif engine == 'chromium':
        with tmp.NamedTemporaryFile('w', suffix='.html', encoding='utf-8') as interactive_file:
            interactive_file.write(document)
            interactive_filename = interactive_file.name
            static_filename = interactive_filename.replace('.html', '.pdf')

            command = 'chromium --headless --disable-gpu --audio-output-channels=0 --print-to-pdf={pdf} {html}'.format(pdf=static_filename, html=interactive_filename)
            subprocess.check_call(command.split())

            if compress:
                # needs svg to run
                small_static_filename = static_filename.replace('.pdf', '_small.pdf')
                command = 'gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE -dBATCH -dQUIET -sOutputFile={pdfout} {pdfin}'.format(pdfin=static_filename, pdfout=small_static_filename)
                subprocess.check_call(command.split())

            with open(small_static_filename if compress else static_filename, 'rb') as static_file:
                static_bytes = static_file.read()

            os.remove(static_filename)
            if compress:
                os.remove(small_static_filename)
    else:
        raise ValueError(f'invalid engine: {engine}')

    return static_bytes
于 2021-02-04T01:47:01.767 回答