example_toggle_visibility.py

import argparse

import neuroglancer
import neuroglancer.cli

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()

    def toggle_visibility(s):
        with viewer.txn() as s:
            if s.layers["a"].visible is True:
                s.layers["a"].visible = False
                print("Setting visibility to false")
            else:
                s.layers["a"].visible = True
                print("Setting visibility to true")

    viewer.actions.add("toggle-visibility", toggle_visibility)
    with viewer.config_state.txn() as s:
        s.input_event_bindings.viewer["keys"] = "toggle-visibility"

    with viewer.txn() as s:
        s.dimensions = neuroglancer.CoordinateSpace(
            names=["x", "y"], units="nm", scales=[1, 1]
        )
        s.position = [150, 150]
        s.layers.append(
            name="a",
            layer=neuroglancer.LocalAnnotationLayer(
                dimensions=s.dimensions,
                annotations=[
                    neuroglancer.PointAnnotation(
                        id="1",
                        point=[150, 150],
                    ),
                ],
                shader="""
void main() {
  setColor(prop_color());
  setPointMarkerSize(prop_size());
}
""",
            ),
        )
        s.layout = "xy"
        s.selected_layer.layer = "a"
    print(viewer)