diff --git a/src/plot.h b/src/plot.h
--- a/src/plot.h
+++ b/src/plot.h
@@ -73,6 +73,8 @@ public slots:
 
     void setNumOfSamples(unsigned value);
 
+    void setPlotWidth(double width);
+
 protected:
     /// update the display of symbols depending on `symbolSize`
     void updateSymbols();
@@ -82,6 +84,7 @@ private:
     double yMin, yMax;
     double _xMin, _xMax;
     unsigned numOfSamples;
+    double plotWidth;
     int symbolSize;
     Zoomer zoomer;
     ScaleZoomer sZoomer;