主图增加笔/线段背驰与面积数字，并修正 SD99999 显示。

三周期分开关控制，只画数字不画图标；线段面积比沿用同向笔面积口径。

Co-authored-by: Cursor <cursoragent@cursor.com>

chanlun/core/ChanSEG.py

@@ -43,6 +43,29 @@ class ChanSEG():
         self.macd_hist = macd_hist
     def set_macd_div(self, macd_div):
         self.macd_div = macd_div
+    def cal_macdhist(self):
+        # 线段面积 = 同向笔 MACD 柱面积之和（与笔面积口径一致）
+        acc = 0.0
+        seg_dir_name = getattr(self.dir, 'name', None)
+        for bi in self.bi_list:
+            if bi is None:
+                continue
+            if getattr(getattr(bi, 'dir', None), 'name', None) != seg_dir_name:
+                continue
+            acc += float(bi.macd_hist or 0)
+        self.macd_hist = acc
+        return acc
+    def cal_macd_div(self):
+        # 与前一个同向线段比面积：seg.pre 是反向邻段，pre.pre 才是同向
+        self.macd_div = 0.0
+        prev = self.pre.pre if self.pre and self.pre.pre else None
+        if prev is None:
+            return 0.0
+        prev_hist = float(prev.macd_hist or 0)
+        if prev_hist == 0:
+            return 0.0
+        self.macd_div = float(self.macd_hist or 0) / prev_hist
+        return self.macd_div
     def set_end_bi(self, bi: ChanBI, sure_bi: ChanBI):
         self.end_bi = bi
         if bi and bi.is_sure: