webdriver_example.py

import argparse

import neuroglancer
import neuroglancer.cli
import neuroglancer.webdriver

ap = argparse.ArgumentParser()
neuroglancer.cli.add_server_arguments(ap)
ap.add_argument("--browser", choices=["chrome", "firefox"], default="chrome")
args = ap.parse_args()
neuroglancer.cli.handle_server_arguments(args)
viewer = neuroglancer.Viewer()
with viewer.txn() as s:
    s.layers["image"] = neuroglancer.ImageLayer(
        source="precomputed://gs://neuroglancer-janelia-flyem-hemibrain/emdata/clahe_yz/jpeg",
    )
    s.layers["segmentation"] = neuroglancer.SegmentationLayer(
        source="precomputed://gs://neuroglancer-janelia-flyem-hemibrain/v1.1/segmentation",
    )

webdriver = neuroglancer.webdriver.Webdriver(
    viewer, headless=False, browser=args.browser
)


def get_loading_progress():
    return webdriver.driver.execute_script(
        """
const userLayer = viewer.layerManager.getLayerByName("segmentation").layer;
return userLayer.renderLayers.map(x => x.layerChunkProgressInfo)
 """
    )