Update app.py

app.py

@@ -82,18 +82,20 @@ df['Original Issue Year'] = df['Original Issue Date'].dt.year
 # else:
 #     st.write("No data available for the 'License Status' plot.")
 
-# Visualization: Stacked Bar Chart
-st.subheader("License Status by State (Stacked)")
-chart_stacked = alt.Chart(state_status_counts).mark_bar().encode(
+# Visualization: Heatmap
+st.subheader("Heatmap of License Status by State")
+chart_heatmap = alt.Chart(state_status_counts).mark_rect().encode(
     x=alt.X('State:N', title='State'),
-    y=alt.Y('Count:Q', title='Number of Licenses'),
-    color=alt.Color('License Status:N', title='License Status', scale=alt.Scale(scheme='category20'))
+    y=alt.Y('License Status:N', title='License Status'),
+    color=alt.Color('Count:Q', title='Number of Licenses', scale=alt.Scale(scheme='viridis')),
+    tooltip=['State', 'License Status', 'Count']
 ).properties(
     width=600,
     height=400,
-    title="License Status by State (Stacked)"
+    title="Heatmap of License Status by State"
 )
-st.altair_chart(chart_stacked)
+st.altair_chart(chart_heatmap)
+
 
 # Write-up for Visualization 1
 st.write("""