example_cross_section.py

import argparse
import copy
import time

import neuroglancer
import neuroglancer.cli
from example import add_example_layers

if __name__ == "__main__":
    ap = argparse.ArgumentParser()
    neuroglancer.cli.add_server_arguments(ap)
    args = ap.parse_args()
    neuroglancer.cli.handle_server_arguments(args)

    viewer = neuroglancer.Viewer()
    with viewer.txn() as s:
        a, b = add_example_layers(s)
        s.layout.type = "3d"
        s.layout.cross_sections["a"] = neuroglancer.CrossSection()

    def interpolate_to(final_state, frames_per_second=5, seconds=1):
        total_frames = int(round(seconds * frames_per_second))
        initial_state = viewer.state
        for frame_i in range(total_frames):
            t = frame_i / total_frames
            viewer.set_state(
                neuroglancer.ViewerState.interpolate(initial_state, final_state, t)
            )
            time.sleep(1 / frames_per_second)
        viewer.set_state(final_state)

    def move_by(offset, **kwargs):
        final_state = copy.deepcopy(viewer.state)
        final_state.voxel_coordinates += offset
        interpolate_to(final_state, **kwargs)

    def do_move_by():
        move_by([100, 0, 0], seconds=1, frames_per_second=10)

    print(viewer)