Update app.py

app.py

@@ -1,5 +1,5 @@
 import os
-# ✅ Fix Matplotlib config/cache permission issue in read-only containers
+# ✅ Avoid permission issues for Matplotlib config/cache
 os.environ["MPLCONFIGDIR"] = "/tmp/matplotlib"
 
 import uuid
@@ -20,17 +20,35 @@ from linebot.v3.webhooks import MessageEvent, TextMessageContent
 import requests
 import pandas as pd
 
-# --- Matplotlib (headless)
+# --- Matplotlib (headless) ---
 import matplotlib
-matplotlib.use("Agg")   # Use Agg backend (no display server required)
+matplotlib.use("Agg")
 import matplotlib.pyplot as plt
 from matplotlib.colors import Normalize
 import matplotlib.cm as cm
+from matplotlib import font_manager as fm
+
+# ✅ Try to set a CJK-capable font for Chinese text
+# Install fonts-noto-cjk in container for best result
+possible_fonts = [
+    "/usr/share/fonts/opentype/noto/NotoSansCJK-Regular.ttc",
+    "/usr/share/fonts/truetype/noto/NotoSansCJK-Regular.ttc",
+    "/usr/share/fonts/truetype/arphic/ukai.ttc",
+    "/usr/share/fonts/truetype/wqy/wqy-microhei.ttc"
+]
+for font_path in possible_fonts:
+    if os.path.exists(font_path):
+        font_prop = fm.FontProperties(fname=font_path)
+        matplotlib.rcParams["font.family"] = font_prop.get_name()
+        print(f"✅ Using CJK font: {font_prop.get_name()}")
+        break
+else:
+    print("⚠️ No CJK font found, Chinese glyphs may not display correctly.")
 
 # --- Environment Variables ---
 CHANNEL_ACCESS_TOKEN = os.getenv("CHANNEL_ACCESS_TOKEN")
 CHANNEL_SECRET = os.getenv("CHANNEL_SECRET")
-HF_SPACE_URL = os.getenv("SPACEURL")  # e.g., https://<space>.hf.space
+HF_SPACE_URL = os.getenv("SPACEURL")  # e.g., https://your-space.hf.space
 
 # --- Writable static directory ---
 STATIC_DIR = os.getenv("STATIC_DIR", os.path.join(tempfile.gettempdir(), "static"))
@@ -41,7 +59,7 @@ app = Flask(__name__)
 configuration = Configuration(access_token=CHANNEL_ACCESS_TOKEN)
 handler = WebhookHandler(CHANNEL_SECRET)
 
-# --- Welcome & Health ---
+# --- Routes ---
 @app.route("/", methods=["GET"])
 def home():
     return """
@@ -74,7 +92,7 @@ def healthz():
 def serve_static(filename):
     return send_from_directory(STATIC_DIR, filename)
 
-# --- Earthquake Query Logic ---
+# --- Earthquake Data Functions ---
 USGS_API_BASE_URL = "https://earthquake.usgs.gov/fdsnws/event/1/query"
 
 def _iso(dt: datetime) -> str:
@@ -147,7 +165,7 @@ def fetch_taiwan_df_this_year(min_mag=5.0) -> pd.DataFrame | str:
     except Exception as e:
         return f"❌ 查詢失敗: {e}"
 
-# --- Map with Matplotlib ---
+# --- Map Creation ---
 def create_and_save_map(df: pd.DataFrame) -> str:
     fig, ax = plt.subplots(figsize=(9, 6), dpi=150)
     lon_min, lon_max = 118.5, 123.5
@@ -156,7 +174,7 @@ def create_and_save_map(df: pd.DataFrame) -> str:
     ax.set_ylim(lat_min, lat_max)
     ax.set_xlabel("Longitude (°E)")
     ax.set_ylabel("Latitude (°N)")
-    ax.set_title(f"今年 ({datetime.now(timezone.utc).year}) 台灣區域顯著地震 (M≥5.0)  — UTC")
+    ax.set_title(f"今年 ({datetime.now(timezone.utc).year}) 台灣區域顯著地震 (M≥5.0) — UTC")
     ax.grid(True, linestyle="--", linewidth=0.5, alpha=0.4)
 
     mags = df["magnitude"].astype(float).clip(lower=0)
@@ -165,7 +183,7 @@ def create_and_save_map(df: pd.DataFrame) -> str:
     colors = cmap(norm(mags.values))
     sizes = 15 + (mags - mags.min()) * 25
 
-    sc = ax.scatter(
+    ax.scatter(
         df["longitude"].values,
         df["latitude"].values,
         s=sizes,
@@ -178,10 +196,6 @@ def create_and_save_map(df: pd.DataFrame) -> str:
     cbar = fig.colorbar(cm.ScalarMappable(norm=norm, cmap=cmap), ax=ax, pad=0.02)
     cbar.set_label("Magnitude")
 
-    for m in [5.0, 6.0, 7.0]:
-        ax.scatter([], [], s=15 + (m - mags.min()) * 25, c="none", edgecolor="k", label=f"M {m:.1f}")
-    ax.legend(title="Size ∝ Magnitude", loc="lower right", framealpha=0.9)
-
     filename = f"map_{uuid.uuid4().hex}.png"
     filepath = os.path.join(STATIC_DIR, filename)
     fig.tight_layout()
@@ -190,6 +204,7 @@ def create_and_save_map(df: pd.DataFrame) -> str:
     return filename
 
 def _base_url_for_images() -> str:
+    # Always prefer HF_SPACE_URL for LINE
     if HF_SPACE_URL:
         return HF_SPACE_URL.rstrip("/")
     return request.url_root.rstrip("/")
@@ -241,7 +256,7 @@ def handle_message(event):
                 "📖 地震預警 dayichen 指令說明\n\n"
                 "➡️ /help\n   說明：顯示此幫助訊息。\n\n"
                 "➡️ 地震\n   說明：查詢全球最近 24 小時內，M≥5.0 的顯著地震。\n\n"
-                "➡️ 臺灣地震 / 台灣地震\n   說明：查詢今年以來台灣區域 (21–26°N, 119–123°E) M≥5.0 地震。\n\n"
+                "➡️ 臺灣地震 / 台灣地震\n   說明：查詢今年以來台灣區域 M≥5.0 地震。\n\n"
                 "➡️ 臺灣地震畫圖 / 台灣地震畫圖\n   說明：繪製今年台灣區域 M≥5.0 地震分佈圖並回傳圖片。\n\n"
                 "➡️ 你好\n   說明：顯示歡迎訊息。"
             )