diff --git a/vnpy/chart/item.py b/vnpy/chart/item.py
index 467b9c3e..979686df 100644
--- a/vnpy/chart/item.py
+++ b/vnpy/chart/item.py
@@ -115,7 +115,7 @@ class ChartItem(pg.GraphicsObject):
         max_ix = int(rect.right())
         max_ix = min(max_ix, len(self._bar_picutures))
 
-        rect_area = (rect.left(), rect.right())
+        rect_area = (min_ix, max_ix)
         if rect_area != self._rect_area or not self._item_picuture:
             self._rect_area = rect_area
             self._draw_item_picture(min_ix, max_ix)
diff --git a/vnpy/chart/widget.py b/vnpy/chart/widget.py
index 53b5da1a..45c0b26c 100644
--- a/vnpy/chart/widget.py
+++ b/vnpy/chart/widget.py
@@ -470,10 +470,11 @@ class ChartCursor(QtCore.QObject):
 
         for item, plot in self._item_plot_map.items():
             item_info_text = item.get_info_text(self._x)
-            if item_info_text:
-                if plot not in buf:
-                    buf[plot] = item_info_text
-                else:
+
+            if plot not in buf:
+                buf[plot] = item_info_text
+            else:
+                if item_info_text:
                     buf[plot] += ("\n\n" + item_info_text)
 
         for plot_name, plot in self._plots.items():