Update app.py

app.py

@@ -3,7 +3,6 @@ import pandas as pd
 import plotly.graph_objects as go
 import os
 from zipfile import ZipFile
-import plotly.io as pio
 try:
     import kaleido
 except ImportError:
@@ -59,7 +58,7 @@ def create_radar_chart(df, selected_rows, selected_columns):
             radialaxis=dict(
                 visible=True,
                 range=[0, df[selected_columns].values.max() * 1.1],
-                tickfont=dict(size=12, color='black', family="Microsoft JhengHei, Noto Sans CJK, Arial")  # 調整刻度文字顏色為黑色並設定字體
+                 tickfont=dict(size=12, color='black', family="Microsoft JhengHei, Noto Sans CJK, Arial") # 調整刻度文字顏色為黑色並設定字體
             ),
             angularaxis=dict(
                 tickfont=dict(size=16, color='black', family="Microsoft JhengHei, Noto Sans CJK, Arial")  # 放大字體，顏色為黑色並設定字體
@@ -67,7 +66,7 @@ def create_radar_chart(df, selected_rows, selected_columns):
         ),
         showlegend=True,
         legend=dict(
-            font=dict(size=14, color='black', family="Microsoft JhengHei, Noto Sans CJK, Arial")  # 圖例文字加大並改為黑色並設定字體
+            font=dict(size=14, color='black', family="Microsoft JhengHei, Noto Sans CJK, Arial") # 圖例文字加大並改為黑色並設定字體
         ),
         title='學生成績雷達圖',
         plot_bgcolor='white',  # 背景為白色
@@ -77,6 +76,30 @@ def create_radar_chart(df, selected_rows, selected_columns):
 
     return fig
 
+def apply_font_to_all_text(fig):
+    """強制設定圖表內所有文字元素的字型"""
+    for trace in fig.data:
+        if hasattr(trace, 'textfont'):
+             trace.textfont.family = "Microsoft JhengHei, Noto Sans CJK, Arial"
+        if hasattr(trace, 'marker') and hasattr(trace.marker, 'textfont'):
+            trace.marker.textfont.family = "Microsoft JhengHei, Noto Sans CJK, Arial"
+
+    fig.update_layout(
+       font=dict(
+           family="Microsoft JhengHei, Noto Sans CJK, Arial"
+        )
+    )
+
+    if hasattr(fig, 'layout') and hasattr(fig.layout, 'xaxis'):
+        fig.layout.xaxis.tickfont.family = "Microsoft JhengHei, Noto Sans CJK, Arial"
+    if hasattr(fig, 'layout') and hasattr(fig.layout, 'yaxis'):
+        fig.layout.yaxis.tickfont.family = "Microsoft JhengHei, Noto Sans CJK, Arial"
+    if hasattr(fig, 'layout') and hasattr(fig.layout, 'polar') and hasattr(fig.layout.polar, 'radialaxis'):
+            fig.layout.polar.radialaxis.tickfont.family = "Microsoft JhengHei, Noto Sans CJK, Arial"
+    if hasattr(fig, 'layout') and hasattr(fig.layout, 'polar') and hasattr(fig.layout.polar, 'angularaxis'):
+            fig.layout.polar.angularaxis.tickfont.family = "Microsoft JhengHei, Noto Sans CJK, Arial"
+
+    return fig
 
 def save_all_radar_charts(df, selected_columns, comparison_rows):
     """批次生成並儲存每個學生與指定比較對象的雷達圖"""
@@ -88,15 +111,10 @@ def save_all_radar_charts(df, selected_columns, comparison_rows):
             continue
 
         fig = create_radar_chart(df, [student] + comparison_rows, selected_columns)
+        fig = apply_font_to_all_text(fig)
 
-        # 這裡使用 plotly.io.to_image 直接生成圖片
-        img_bytes = pio.to_image(fig, format="png",
-                                 engine="kaleido",
-                                 font_family="Microsoft JhengHei, Noto Sans CJK, Arial"
-                                 )
         file_path = os.path.join(output_dir, f"{student}_comparison.png")
-        with open(file_path, "wb") as f:
-            f.write(img_bytes)
+        fig.write_image(file_path, engine="kaleido")
 
     # 壓縮所有圖表
     zip_path = "radar_charts.zip"