feat: allow generating poster with no text by leaving fields blank

app.py

@@ -198,7 +198,7 @@ def generate_poster(
             return None, "❌ 请输入有效的经纬度"
 
         coords = (float(custom_lat), float(custom_lon))
-        display_city = custom_city_name if custom_city_name else "Custom Location"
+        display_city = custom_city_name if custom_city_name else ""
         display_country = custom_country_name if custom_country_name else ""
 
         # Determine output filename component

create_map_poster.py

@@ -590,26 +590,28 @@ def create_poster(
             )
 
         # Coordinates (Third line, smaller)
-        lat, lon = point
-        coords_text = (
-            f"{lat:.4f}° N / {lon:.4f}° E"
-            if lat >= 0
-            else f"{abs(lat):.4f}° S / {lon:.4f}° E"
-        )
-        if lon < 0:
-            coords_text = coords_text.replace("E", "W")
-
-        ax.text(
-            0.5,
-            0.07,
-            coords_text,
-            transform=ax.transAxes,
-            color=THEME["text"],
-            alpha=0.7,
-            ha="center",
-            fontproperties=font_coords,
-            zorder=11,
-        )
+        # Only show if there is at least a title or subtitle, or if specifically desired
+        if display_city or display_country:
+            lat, lon = point
+            coords_text = (
+                f"{lat:.4f}° N / {lon:.4f}° E"
+                if lat >= 0
+                else f"{abs(lat):.4f}° S / {lon:.4f}° E"
+            )
+            if lon < 0:
+                coords_text = coords_text.replace("E", "W")
+
+            ax.text(
+                0.5,
+                0.07,
+                coords_text,
+                transform=ax.transAxes,
+                color=THEME["text"],
+                alpha=0.7,
+                ha="center",
+                fontproperties=font_coords,
+                zorder=11,
+            )
 
     # --- ATTRIBUTION (bottom right) ---
     attr_font = font_sub_base.copy()