I'm creating a PDF document using HtmlRenderer.PdfSharp library. Back-end receives html from front-end and creates PDF using GeneratePdf() method.
PdfGenerator.GeneratePdf(html, PdfSharp.PageSize.A4);
The process works fine when standard latin characters are used in html. I've tried to pass UTF-8 test file as an input in front-end and some of the characters hasn't rendered properly as seen in attached image. When I've bypassed front-end by hard-coding html value the result was the same, so I assume the problem lays in library.
Is there a way to properly render those characters with this library? I especially care about math symbols such as ∮ or ℝ ⊂ ℂ.
I've found the answer thanks to https://stackoverflow.com/a/59377248
Setting font-family in html element containing math symbols to "Segoe UI Symbol" allowed PdfSharp to render those symbols properly.
Character Map is an useful tool in searching for fonts that include wanted symbols.
Related
I have an inDesign document that uses a character style to change ü to wingdings which prints a check mark. This works perfectly throughout the document and when I export to PDF, but not in an eBook. In the eBook the check is just the regular ü. I am getting an error message about the css, but I don't see anyplace that addresses fonts in the export. Does anyone know of a way around this? Thank you!
I'm building a website with Wordpress, but sometimes (I don't know why) the html entities declared in my php files are displayed as a � (a black diamond with a white question mark). My charset attribute is already set to UTF-8 (as shown in the picure below). It could be a problem of the text editor (I'm currently using the built-in editor of Aruba)... How can I make sure that the encoding is right?
Try copying your code files into notepad++ and make sure that the encoding is actually set to UTF-8 without BOM.
In my asp.net website I have a HTML page which contains some words with Superscript, for example the HTML representation is as below...
ABC<sup>def</sup>
when it is rendered in browser it appears like this : ABCdef
I have a export feature which export the HTML document to a word document. When I am exporting it is being exported as ABC<sup>def</sup> in the worddoc.
I have been trying to do it using some kind of regex html = html.Replace("<sup>", "\"");
but that doesn't help.
Can anybody please help me how would I make it appear as ABCdef in my word document too using asp.net?
This is an older question but I've been trying to do the same thing in reverse. The problem is with how Word formats and defines its super and subscripts.
There are no tags that Word used to define super and subscripts, it uses relative positioning and font-size declarations to generate symbols that look like super and subscripts.
Unfortunately there is no reliable regex to turn Word's positioning into super/subscripts, and there is no way to regex a document with those tags to make Word recognize them.
I have an ipython notebook with an embedded image from my local drive. I was expecting it to be embedded in the JSON along with the output of code cells, but when I distributed the notebook, the image did not appear to users. What is the recommended way (or ways) to embed an image in a Notebook, so that it doesn't disappear if users rerun code cells, clear cell output, etc.?
The notebook system caches images included with , but they last only until the python "kernel" serving the notebook is restarted. If I rename the image file on disk, I can close and reopen the notebook and it still shows the image; but it disappears when I restart the kernel.
Edit: If I generate an image as code cell output and then export the notebook to html, the image is embedded in the html as encoded data. Surely there must be a way to hook into this functionality and load the output into a markdown (or better yet "raw nbconvert") cell?
from IPython.display import Image
Image(filename='imagename.png')
will be exported (with ipython nbconvert) to html that contains the following:
<div class="output_png output_subarea output_execute_result">
<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAnAAAAFgCAYAAAA...
</div>
However, even when I manually embedded this snippet into a markdown cell, I couldn't get the image to display. What am I doing wrong?
Update (2020)
Apparently, the problem has (finally!) been addressed in the newer notebook / Jupyter versions: as of 2018 (thanks for the link #Wayne), the html sanitizer will accept an embedded html image, as in <img src="data:image/png;base64,iV...> . Markdown image syntax also accepts images as embedded data, so there are two ways to do this. Details in these helpful answers:
markdown image syntax (answer by #id01)
html element syntax (in answer by #tel -- note that it works now!)
Are you happy to use an extra code cell to display the image? If so, use this:
from IPython.display import Image
Image(filename="example.png")
The output cell will have the raw image data embedded in the .ipynb file so you can share it and the image will be retained.
Note that the Image class also has a url keyword, but this will only link to the image unless you also specify embed=True (see the documentation for details). So it's safer to use the filename keyword unless you are referring to an image on a remote server.
I'm not sure if there is an easy solution if you require the image to be included in a Markdown cell, i.e. without a separate code cell to generate the embedded image data. You may be able to use the python markdown extension which allows dynamically displaying the contents of Python variables in markdown cells. However, the extension generates the markdown cells dynamically, so in order to retain the output when sharing the notebook you will need to run ipython nbconvert --to notebook original_notebook.ipynb --output preprocessed_notebook using the preprocessor pymdpreprocessor.py as mentioned in the section "Installation". The generated notebook then has the data embedded in the markdown cell as an HTML tag of the form <img src="data:image/png;base64,..."> so you can delete the corresponding code cell from preprocessed_notebook.ipynb. Unfortunately, when I tried this the contents of the <img> tag weren't actually displayed in the browser, so not sure if this is a viable solution. :-/
A different option would be to use the Image class in a code cell to generate the image as above, and then use nbconvert with a custom template to remove code input cells from the notebook. See this thread for details. However, this will strip all code cells from the converted notebook, so it may not be what you want.
The reason why the
<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAnAAAAFgCAYAAAA...
tag doesn't do anything when you put it in a markdown cell is because IPython uses an HTML sanitizer (something called Google Caja) that screens out this type of tag (and many others) before it can be rendered.
The HTML sanitizer in IPython can be completely disabled by adding the following line to your custom.js file (usually located at ~/.ipython/profile_default/static/custom/custom.js):
iPython.security.sanitize_html = function (html) { return html; };
It's not a great solution though, as it does create a security risk, and it doesn't really help that much with distribution.
Postscript:
The ability to render base64 encoded strings as images != obvious security concern, so there should be a way for the Caja people to eventually allow this sort of thing through (although the related feature request ticket was first opened back in 2012, so don't hold your breath).
I figured out that replacing the image URL in the  with a base64 URL, similar to the ones found above, can embed an image in a markdown container.
Example markdown:
If using the IPython HTML() function to output raw HTML, you can embed a linked image in base64 inside an <img> tag using the following method:
import base64
import requests
from IPython.core.display import HTML
def embedded_image(url):
response = requests.get(url)
uri = ("data:" +
response.headers['Content-Type'] + ";" +
"base64," + str(base64.b64encode(response.content).decode('utf-8')))
return uri
# Here is a small example. When you export the notebook as HTML,
# the image will be embedded in the HTML file
html = f'<img src="{embedded_image("https://upload.wikimedia.org/wikipedia/commons/5/56/Kosaciec_szczecinkowaty_Iris_setosa.jpg")}" />'
HTML(html)
UPDATE: As pointed out by #alexis, this doesn't actually answer the question correctly, this will not allow users to re-run cells and have images persist (this solution only allows one to embed the images into exports).
As of Jupyter Notebook 5, you can attach image data to cells, and refer to them from the cell via attachment:<image-file-name>. See the menu Edit > Insert Image, or use drag and drop.
Unfortunately, when converting notebooks with attached (embedded) images to HTML, those images will not show up.
To get them into the HTML code, you can use (for instance) nbtoolbelt.
It will replace those attachment: references by data: with the image data embedded in the img tag.
I'm trying out Pandoc on OS X, and results thus far are impressive. One blocking problem, however, is getting CSS styles to work on inline code samples. I'm converting from Markdown to PDF.
I have this string in my source:
* Create a simple HTML document (<span class="filename">simple.html</span>) and load it into the browser via the file system
I've also tried this:
* Create a simple HTML document (`simple.html`{.filename}) and load it into the browser via the file system
I'd like to apply the class "filename" to the enclosed text in each case, but it doesn't seem to do anything to the output. However the manual says:
Some output formats can use this information to do syntax highlighting. Currently, the only output formats that uses this information are HTML and LaTeX.
Here's my command:
pandoc \
--output ./output.pdf \
--css source/styles.css \
source/en/docs/input.md
I'm converting to PDF, which is written by LaTeX by Pandoc internally. Can I get this to work? Or, can I use a style defined using a LaTeX command? - it doesn't have to be CSS. However, it must be a style system - it's not workable to change italic/font/colour attributes on each occasion.
I've tried sending output temporarily to HTML, and in that situation the styles are imported directly from the specific style asset. So, my stylesheet specification and span markup is correct, at least for one output format.
Addenda
A couple of afterthoughts:
The solution does not have to be Pandoc or Markdown. However, it does need to be a trivial text-based markup language that can convert reliably to PDF, as I want to store the document files on Git for easy forking and merging. I'm not keen on HTML as it is verbose, and engines to convert it aren't that great (though, admittedly, my formatting requirements are modest).
The HTML output from Pandoc is fine, so if I can find something that converts the (simple) HTML/CSS to PDF reliably, I'll be fine. Of course, Pandoc should be able to do this, but inline styles (for the background colour on code fragments) aren't rendered. This might be a faff, as I'll have to reintroduce things like page-breaks, which can be non-trivial in HTML-to-PDF converters.
"I'd like to apply the class "filename" to the enclosed text in each case, but it doesn't seem to do anything to the output."
It works for HTML. Running Pandoc interactively, ^D to see the resulting code:
$> pandoc -f markdown -t html
* Create a simple HTML document (`simple.html`{.filename}) and load it.
^D
<ul>
<li>Create a simple HTML document (<code class="filename">simple.html</code>) and load it.</li>
</ul>
It doesn't work for LaTeX if you use the .filename class. You need to use one of the known classnames:
$> pandoc -f markdown -t latex
* Create a simple HTML document (`simple.html`{.filename}) and load it.
^D
\begin{itemize}
\tightlist
\item
Create a simple HTML document (\texttt{simple.html}) and load it.
\end{itemize}
Now using one of the known classnames, like .bash, .postscript, .php, ...:
$> pandoc -f markdown -t latex
* Create a simple HTML document (`simple.html`{.bash}) and load it.
^D
\begin{itemize}
\tightlist
\item
Create a simple HTML document (\VERB|\KeywordTok{simple.html}| and
load it.
\end{itemize}
To convert HTML + CSS into PDF, you can also look into PrinceXML, which is free for non-commercial use.
I don't know LaTeX at all, but have hacked this solution using this helpful manual. First, create a style:
\definecolor{silver}{RGB}{230,230,230}
\newcommand{\inlinecodeblock}[1]{
\colorbox{silver}{
\texttt{#1}
}
}
And here's how to use it:
Some \inlinecodeblock{inline code}, and some widgets, go here
This creates a style with a background colour and a monospaced font. The margin and padding are a bit large for my preferences, but it's a very useable start. Here's what it looks like:
The disadvantage is that if I wish to output to a format that supports styles proper (such as HTML) then these are lost. Also, my solution only works with LaTeX/PDF. Thus, if you can fix these issues, please add a better answer!
Addendum: I have a better approach, which is thus:
\newcommand{\inlinecodeblock}[1]{
\fboxsep 1pt
\fboxrule 0pt
\colorbox{silver}{\strut{\texttt{#1}}}
}
This avoids the problem of excess horizontal padding - I think it was the line break in the colorbox parameter that did it. I've added in strut, which keeps highlights the same height regardless of whether the text has descenders.
It's not perfect though - there's still too much horizontal margin outside the box, and a comma after a box will still orphan onto the next line. I may give up with LaTeX, and render to HTML from Pandoc, and then use wkhtmltopdf to render the final document.