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jwebster-LANL opened this issue Sep 22, 2020 · 1 comment
Closed

Tainted canvases may not be exported #2785

jwebster-LANL opened this issue Sep 22, 2020 · 1 comment

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@jwebster-LANL
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jwebster-LANL commented Sep 22, 2020 •
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I'm embedding some plotly graphs into a pyqt application using the QWebEngineView. Everything seems to work well except for when I click on the "Download plot as a png" button in the toolbar. I get the error:

js: Uncaught SecurityError: Failed to execute 'toDataURL' on 'HTMLCanvasElement': Tainted canvases may not be exported.

Not sure if this is a bug (it seems like it should work), or a feature request (I'd like to be able to do this). Maybe there's a way around the error?

import plotly.offline as po
import plotly.graph_objs as go
import plotly.express as px

from PyQt5.QtWebEngineWidgets import QWebEngineView
from PyQt5 import QtCore, QtWidgets
import sys

def show_qt(fig):
    raw_html = '<html><head><meta charset="utf-8" />'
    raw_html += '<script src="https://cdn.plot.ly/plotly-latest.min.js"></script></head>'
    raw_html += '<body>'
    raw_html += po.plot(fig, include_plotlyjs=False, output_type='div')
    raw_html += '</body></html>'

    fig_view = QWebEngineView()
    # setHtml has a 2MB size limit, need to switch to setUrl on tmp file
    # for large figures.
    fig_view.setHtml(raw_html)
    fig_view.show()
    fig_view.raise_()
    return fig_view


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)

    df = px.data.election()
    geojson = px.data.election_geojson()

    fig = px.choropleth(df, geojson=geojson, color="Bergeron",
                        locations="district", featureidkey="properties.district",
                        projection="mercator"
                        )
    fig.update_geos(fitbounds="locations", visible=False)
    fig.update_layout(margin={"r":0,"t":0,"l":0,"b":0})
    fig_view = show_qt(fig)
    sys.exit(app.exec_())
@gvwilson
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Hi - we are trying to tidy up the stale issues and PRs in Plotly's public repositories so that we can focus on things that are still important to our community. Since this one has been sitting for several years, I'm going to close it; if it is still a concern, please add a comment letting us know what recent version of our software you've checked it with so that I can reopen it and add it to our backlog. Thanks for your help - @gvwilson

@gy-mate gy-mate mentioned this issue Apr 10, 2025
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@gvwilson @jwebster-LANL