Update app.py

app.py

@@ -49,15 +49,28 @@ scatter = (
 acquisition_data = data['Year Acquired'].value_counts().reset_index()
 acquisition_data.columns = ['Year Acquired', 'Building Count']
 
-# Create Altair bar chart
-bar_chart = alt.Chart(acquisition_data).mark_bar().encode(
-    x=alt.X('Year Acquired:O', title='Year Acquired', sort='-x'),
-    y=alt.Y('Building Count:Q', title='Number of Buildings'),
-    tooltip=['Year Acquired', 'Building Count']
-).properties(
-    title="Number of Buildings Acquired Over the Years",
-    width=600,
-    height=400
+# # Create Altair bar chart
+# bar_chart = alt.Chart(acquisition_data).mark_bar().encode(
+#     x=alt.X('Year Acquired:O', title='Year Acquired', sort='-x'),
+#     y=alt.Y('Building Count:Q', title='Number of Buildings'),
+#     tooltip=['Year Acquired', 'Building Count']
+# ).properties(
+#     title="Number of Buildings Acquired Over the Years",
+#     width=600,
+#     height=400
+# )
+bar_chart = (
+    alt.Chart(acquisition_data)
+    .mark_bar()
+    .encode(
+        x=alt.X('Year Acquired:O', title='Year Acquired', sort='-x'),
+        y=alt.Y("Building Count:Q", title="Number of Buildings"),
+        color=alt.condition(click, color, alt.value("lightgray")),
+        tooltip=['Year Acquired', 'Building Count']
+    )
+    .transform_filter(brush)
+    .properties(width=550, title="Square Footage Distribution by Year Acquired")
+    .add_params(click)
 )
 
 # st.altair_chart(bar_chart, use_container_width=True)