[wip] Example files for 2D and 3D progressive loading

examples/_mandelbrot_vizarr.py

@@ -0,0 +1,60 @@
+import logging
+import sys
+import warnings
+
+import napari
+from napari import Viewer
+from napari.experimental._progressive_loading import (
+    add_progressive_loading_image,
+)
+from napari.experimental._progressive_loading_datasets import (
+    mandelbrot_dataset,
+)
+
+warnings.simplefilter(action='ignore', category=FutureWarning)
+
+
+LOGGER = logging.getLogger("mandelbrot_vizarr")
+LOGGER.setLevel(logging.DEBUG)
+
+streamHandler = logging.StreamHandler(sys.stdout)
+formatter = logging.Formatter(
+    "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
+)
+streamHandler.setFormatter(formatter)
+LOGGER.addHandler(streamHandler)
+
+
+if __name__ == "__main__":
+    # This dataset is 2D and visualized in 2D
+    ndisplay = 2
+    large_image = mandelbrot_dataset(max_levels=21)
+
+    # This dataset is 3D and visualized in 2D
+    # from napari.experimental._progressive_loading_datasets import openorganelle_mouse_kidney_em
+    # large_image = openorganelle_mouse_kidney_em()
+
+    # This dataset is 3D and visualized in 3D
+    # ndisplay = 3
+    # large_image = mandelbulb_dataset(max_levels=3)
+
+    viewer = Viewer(ndisplay=ndisplay)
+
+    multiscale_img = large_image["arrays"]
+    viewer._layer_slicer._force_sync = False
+
+    rendering_mode = "progressive_loading"
+
+    if rendering_mode == "progressive_loading":
+        # Make an object that creates/manages all scale nodes
+        add_progressive_loading_image(
+            multiscale_img,
+            viewer=viewer,
+            contrast_limits=[0, 255],
+            colormap='PiYG',
+            ndisplay=ndisplay,
+        )
+    else:
+        layer = viewer.add_image(multiscale_img)
+
+    napari.run()