Update UI and ReadMe

Author: bprobert97

README.md

@@ -4,7 +4,10 @@ Scripts in this repository generate images of the night sky as seen in Glasgow,
 
 If you just want to generate plots, rather than contribute to the code, you can do so for free at: https://starplot-glasgow.onrender.com
 
+![A Screenshot from the Web App](images/website_screenshot.png "A Screenshot from the Web App")
+
 # Examples
+Below are some examples of the two types of plots you can create.
 
 ![A Zenith Star Plot from Glasgow](images/glasgow_zenith.png "A Zenith Star Plot from Glasgow")
 _A Zenith Star Plot from Glasgow_

app.py

@@ -54,6 +54,12 @@
 st.set_page_config(page_title="Glasgow Starplot Viewer", page_icon="🌌")
 st.title("🌌 Glasgow Starplot Viewer")
 
+# Add a note about generation time
+st.info(
+    "⚠️ Generating a chart can take up to **3 minutes** depending on your selections. "
+    "Please be patient while the image is being created."
+)
+
 # Sidebar: controls
 plot_type = st.sidebar.radio("Select Plot Type", ["Horizon", "Zenith"])
 obs_date = st.sidebar.date_input("Date", value=date.today())
@@ -62,7 +68,7 @@
 
 # Extra option: fast vs HD
 quality = st.sidebar.radio("Quality", ["Fast (preview)", "HD (slower)"])
-RESOLUTION = 1200 if quality == "Fast (preview)" else 2400
+RESOLUTION = 600 if quality == "Fast (preview)" else 1200
 
 # Session state
 if "chart_bytes" not in st.session_state:
@@ -102,8 +108,7 @@ def generate_chart(plt_type: str,
     tz = ZoneInfo("Europe/London")
     dt = datetime.combine(obs_date, obs_time).replace(tzinfo=tz)
 
-    with st.spinner("Generating chart, please wait..."):
-        img_bytes = generate_chart(plot_type, dt, mag_limit, RESOLUTION)
+    img_bytes = generate_chart(plot_type, dt, mag_limit, RESOLUTION)
 
     st.session_state.chart_bytes = img_bytes
     st.success("✅ Chart generated!")