Add basic panel app to app.py

Author: robe2037

app/app.py

@@ -4,9 +4,7 @@
 import logging
 import matplotlib.pyplot as plt
 
-# showcase for importing functions from another .py file (in this case from "./app/getGeoDataFrame.py")
-from app.getGeoDataFrame import get_GDF
-
+from app.panel import build_panel_app, serve_panel_app
 
 class App(object):
 
@@ -19,38 +17,12 @@ def execute(self, data: TrajectoryCollection, config: dict) -> TrajectoryCollect
         logging.info(f'Welcome to the {config}')
 
         """Your app code goes here"""
+        
+        pn_app = build_panel_app(data)
 
-        # showcase injecting App settings (parameter `year`)
-        data_gdf = get_GDF(data)  # translate the TrajectoryCollection to a GeoDataFrame
-        logging.info(f'Subsetting data for {config["year"]}')
-        # subset the data to only contain the specified year
-        if config["year"] in data_gdf.index.year:
-            result = data_gdf[data_gdf.index.year == config["year"]]
-        else:
-            result = None
-
-        # showcase creating an artifact
-        if result is not None:
-            result.plot(column=data.get_traj_id_col(), alpha=0.5)
-            plot_file = self.moveapps_io.create_artifacts_file("plot.png")
-            plt.savefig(plot_file)
-            logging.info(f'saved plot to {plot_file}')
-        else:
-            logging.warning("Nothing to plot")
-
-        # showcase accessing auxiliary files
-        auxiliary_file_a = MoveAppsIo.get_auxiliary_file_path("auxiliary-file-a")
-        with open(auxiliary_file_a, 'r') as f:
-            logging.info(f.read())
-
-        # Translate the result back to a TrajectoryCollection
-        if result is not None:
-            result = TrajectoryCollection(
-                result,
-                traj_id_col=data.get_traj_id_col(),
-                t=data.to_point_gdf().index.name,
-                crs=data.get_crs()
-            )
+        serve_panel_app(pn_app)
+        
+        logging.info("Panel app running on port 5006")
 
         # return the resulting data for next Apps in the Workflow
-        return result
+        return data

app/getGeoDataFrame.py

@@ -0,0 +1,31 @@
+import panel as pn
+
+def build_panel_app(data):
+    pn.extension()
+
+    valid_columns = [col for col in data.get_column_names() if not data.to_point_gdf()[col].isna().all()]
+    col_selector = pn.widgets.Select(name="Select column", options = valid_columns, value=valid_columns[0])
+
+    def explore_plot(data, column):
+        return pn.pane.plot.Folium(data.explore(column=column), min_width=800, min_height=600, sizing_mode="stretch_both")
+
+    out_plt = pn.bind(explore_plot, data=data, column=col_selector)
+
+    template = pn.template.MaterialTemplate(
+        site="MoveApps",
+        title="Testing Panel",
+        sidebar=[col_selector],
+        main=[out_plt],
+    )
+
+    return template
+
+def serve_panel_app(template, port=5006):
+    pn.serve(
+        template,
+        start=True,
+        show=False,
+        port=port,
+        address="0.0.0.0",
+        allow_websocket_origin=["*"]
+    )