wishlist: save png about nglview HOT 11 CLOSED

I have created a semi-automated solution for this. Please see https://intuitivetutorial.com/2021/07/06/visualizing-3d-protein-structures-and-exporting-into-images-using-jupyter-notebook/

from nglview.

Example

tv.savefig(filename, frame=None) # current frame
tv.savefig(filename, frame=3)

from nglview.

Do you want to save it through the Python kernel or just as a browser download?

The browser download is straightforward, just call stage.exportImage(...) in the widget.

Via Python would require some changes to ngl to get the image data and the widget would then convert to a base64 string to send to the kernel; Or send it via the more efficient approach outlined in #3.

from nglview.

see also nglviewer/ngl#33

from nglview.

I am more interested in saving png file jupyter notebook. Might be two ways to save?

• from viewer

import nglview as nv
view = nv.TrajectoryViwer(...)
view.savefig(...)

• from right clicking from the screen in the viewer (in notebook).

from nglview.

I am not sure I understand. Should the image be saved via a download from the browser or via the Jupyter kernel running Python?

from nglview.

via the Jupyter kernel running Python

from nglview.

Ok, then the NGL issue needs to be addressed first.

from nglview.

What I have in mind is

import pytraj as pt
import nglview as nv

traj = pt.load('t.nc', 't.parm7')
view = nv.show_pytraj(traj)

for idx_frame in range(traj.n_frames):
    view.frame = idx_frame
    view.save_snapshot('snapshot_{}'.format(idx_frame))

# or better
view.make_movie([...], engine='external_program_can_make_movie')

from nglview.

This means a lot of data will travel from Browser to Kernel, which brings us back to #3.

from nglview.

so now user can download snapshot from Python side. I am thinking about method's name.
Prefer short one.

• export_image
• savefig
• download_snapshot
• screenshot
• ...

example

def screenshot(self):
    self._remote_call('screenshot', target='stage', kwargs=params)

screenshot seems to be good name. :D

from nglview.