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button for canvas toolbar which enables creating a pdf of the figure #443

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button for canvas toolbar which enables creating a pdf of the figure #443

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46e2a16
adds button to the canvas toolbar that creates a pdf of the figure
Mar 27, 2022
7713862
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Mar 27, 2022
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12 changes: 11 additions & 1 deletion ipympl/backend_nbagg.py
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Original file line number Diff line number Diff line change
Expand Up @@ -147,11 +147,13 @@ def _default_toolitems(self):
'move': 'arrows',
'download': 'floppy-o',
'export': 'file-picture-o',
'make_pdf': 'file-pdf',
}

download_item = ('Download', 'Download plot', 'download', 'save_figure')
make_pdf = ('Create pdf', 'Create pdf from figure', 'make_pdf', 'makepdf')

toolitems = NavigationToolbar2.toolitems + (download_item,)
toolitems = NavigationToolbar2.toolitems + (download_item,) + (make_pdf,)

return [
(text, tooltip, icons[icon_name], method_name)
Expand Down Expand Up @@ -275,6 +277,9 @@ def _handle_message(self, object, content, buffers):
Canvas.current_dpi_ratio = content['dpi_ratio']
self.manager.handle_json(content)

elif content['type'] == 'toolbar_button' and content['name'] == 'makepdf':
self._send_savefig_pdf()

else:
self.manager.handle_json(content)

Expand Down Expand Up @@ -450,6 +455,11 @@ def handle_key(key):

handle_key_press = handle_key_release = _handle_key

def _send_savefig_pdf(self):
buf = io.BytesIO()
self.figure.savefig(buf, format='pdf', dpi='figure')
self.send({'data': '{"type": "makepdf"}'}, buffers=[buf.getbuffer()])
Comment on lines +460 to +461
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Changing this a little bit will allow generalizing to more than just PDFs.

  1. Remove the arguments to savefig so that it follows the rcparams
  2. check the rcparams format and use that to construct the mimetype
  3. send that mimetype info along to the frontend
Suggested change
self.figure.savefig(buf, format='pdf', dpi='figure')
self.send({'data': '{"type": "makepdf"}'}, buffers=[buf.getbuffer()])
self.figure.savefig(buf)
format = matplotlib.rcParams['savefig.format']
# some code intepreting the mimetype
# e..g application/pdf, image/svg+xml, image/png etc
self.send({'data': {"type": "download-fig", "format":format, "mimetype":mimetype}}, buffers=[buf.getbuffer()])



class FigureManager(FigureManagerWebAgg):
if matplotlib.__version__ < "3.6":
Expand Down
8 changes: 8 additions & 0 deletions src/mpl_widget.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -157,6 +157,14 @@ export class MPLCanvasModel extends DOMWidgetModel {
document.body.removeChild(save);
}

handle_makepdf(msg: any, dataviews: any) {
const url_creator = window.URL || window.webkitURL;
const buffer = new Uint8Array(dataviews[0].buffer);
const blob = new Blob([buffer], { type: 'application/pdf' });
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With other comment extract the mimetype from the msg

const image_url = url_creator.createObjectURL(blob);
window.open(image_url, '_blank');
Comment on lines +164 to +165
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I'm pretty sure that we need to revoke the object url after downloading

}

handle_resize(msg: { [index: string]: any }) {
this.resize_canvas();
this.offscreen_context.drawImage(this.image, 0, 0);
Expand Down