改进代码

2021-10-08 10:52:05 +08:00
parent f6923b97a2
commit 200b7eeafb
171 changed files with 2894 additions and 1940 deletions
--- a/qwtdemo/qwt/qwt_plot_picker.cpp
+++ b/qwtdemo/qwt/qwt_plot_picker.cpp
@@ -192,6 +192,9 @@ int QwtPlotPicker::yAxis() const
 */
 QwtText QwtPlotPicker::trackerText( const QPoint &pos ) const
 {
+    if ( plot() == NULL )
+        return QwtText();
+
    return trackerTextF( invTransform( pos ) );
 }