diff --git a/doc/dox/whatsnew.dox b/doc/dox/whatsnew.dox
index a0675c8a72..017226cc22 100644
--- a/doc/dox/whatsnew.dox
+++ b/doc/dox/whatsnew.dox
@@ -26,7 +26,7 @@ Changes, compared to  \ref page_whatsnew_V2019_11 "v2019.11" include:
   <li>improved/breaking change: geometric objects now use an adaptive drawing algorithm to represent curves (before e.g. ellipses were always separated into a fixed number of line-segments)</li>
   <li>improved: constructors and access functions for several geometric objects (e.g. more constructors, additional functions to retrieve parameters in diferent forms, iterators for polygons, ...)</li>
   <li>improved/breaking change: reworked class hierarchy of parsed function plots and declared several setters as slots.</li>
-  <li>improved/breaking change: reworked class hierarchy of bar charts.</li>
+  <li>improved/breaking change: reworked class hierarchy of bar & impulse charts.</li>
   <li>improved/breaking change: reworked class hierarchy of range charts.</li>
   <li>improved/breaking change: reworked graph Base-Classes (promoted several setters to slots, added Q_PROPERTY- and Q_ENUM-declarations...)</li>
   <li>improved/breaking change: made more functions and function parameters const</li>
diff --git a/lib/jkqtplotter/graphs/jkqtpimpulses.cpp b/lib/jkqtplotter/graphs/jkqtpimpulses.cpp
index 6ed3a1fb65..7a24469f51 100644
--- a/lib/jkqtplotter/graphs/jkqtpimpulses.cpp
+++ b/lib/jkqtplotter/graphs/jkqtpimpulses.cpp
@@ -34,15 +34,45 @@
 
 
 
-JKQTPImpulsesHorizontalGraph::JKQTPImpulsesHorizontalGraph(JKQTBasePlotter* parent):
-    JKQTPXYBaselineGraph(parent)
+
+JKQTPImpulsesGraphBase::JKQTPImpulsesGraphBase(JKQTBasePlotter* parent):
+    JKQTPXYBaselineGraph(parent), drawSymbols(false)
 {
-    drawSymbols=false;
     initLineStyle(parent, parentPlotStyle);
     initSymbolStyle(parent, parentPlotStyle);
     setLineWidth(3);
 }
 
+QColor JKQTPImpulsesGraphBase::getKeyLabelColor() const {
+    return getLineColor();
+}
+
+void JKQTPImpulsesGraphBase::setColor(QColor c)
+{
+    setLineColor(c);
+    setSymbolColor(c);
+    setSymbolFillColor(JKQTPGetDerivedColor(parent->getCurrentPlotterStyle().graphFillColorDerivationMode, c));
+    c.setAlphaF(0.5);
+    setHighlightingLineColor(c);
+}
+
+void JKQTPImpulsesGraphBase::setDrawSymbols(bool __value)
+{
+    drawSymbols=__value;
+}
+
+bool JKQTPImpulsesGraphBase::getDrawSymbols() const
+{
+    return drawSymbols;
+}
+
+
+JKQTPImpulsesHorizontalGraph::JKQTPImpulsesHorizontalGraph(JKQTBasePlotter* parent):
+    JKQTPImpulsesGraphBase(parent)
+{
+
+}
+
 JKQTPImpulsesHorizontalGraph::JKQTPImpulsesHorizontalGraph(JKQTPlotter* parent):
     JKQTPImpulsesHorizontalGraph(parent->getPlotter())
 {
@@ -126,33 +156,11 @@ void JKQTPImpulsesHorizontalGraph::drawKeyMarker(JKQTPEnhancedPainter& painter,
     QPen p=getLinePen(painter, parent);
     p.setCapStyle(Qt::FlatCap);
     painter.setPen(p);
-    int y=rect.top()+rect.height()/2.0;
+
+    const int y=rect.top()+rect.height()/2.0;
     painter.drawLine(rect.left(), y, rect.right(), y);
-
 }
 
-QColor JKQTPImpulsesHorizontalGraph::getKeyLabelColor() const {
-    return getLineColor();
-}
-
-void JKQTPImpulsesHorizontalGraph::setColor(QColor c)
-{
-    setLineColor(c);
-    setSymbolColor(c);
-    setSymbolFillColor(JKQTPGetDerivedColor(parent->getCurrentPlotterStyle().graphFillColorDerivationMode, c));
-    c.setAlphaF(0.5);
-    setHighlightingLineColor(c);
-}
-
-void JKQTPImpulsesHorizontalGraph::setDrawSymbols(bool __value)
-{
-    drawSymbols=__value;
-}
-
-bool JKQTPImpulsesHorizontalGraph::getDrawSymbols() const
-{
-    return drawSymbols;
-}
 
 
 
@@ -165,16 +173,28 @@ bool JKQTPImpulsesHorizontalGraph::getDrawSymbols() const
 
 
 JKQTPImpulsesVerticalGraph::JKQTPImpulsesVerticalGraph(JKQTBasePlotter* parent):
-    JKQTPImpulsesHorizontalGraph(parent)
+    JKQTPImpulsesGraphBase(parent)
 {
 }
 
 JKQTPImpulsesVerticalGraph::JKQTPImpulsesVerticalGraph(JKQTPlotter *parent):
-    JKQTPImpulsesHorizontalGraph(parent)
+    JKQTPImpulsesVerticalGraph(parent->getPlotter())
 {
 
 }
 
+void JKQTPImpulsesVerticalGraph::drawKeyMarker(JKQTPEnhancedPainter& painter, QRectF& rect) {
+
+
+    painter.save(); auto __finalpaint=JKQTPFinally([&painter]() {painter.restore();});
+    QPen p=getLinePen(painter, parent);
+    p.setCapStyle(Qt::FlatCap);
+    painter.setPen(p);
+    const int x=rect.left()+rect.width()/2.0;
+    painter.drawLine(x, rect.bottom(), x, rect.top());
+
+}
+
 void JKQTPImpulsesVerticalGraph::draw(JKQTPEnhancedPainter& painter) {
 #ifdef JKQTBP_AUTOTIMER
     JKQTPAutoOutputTimer jkaaot("JKQTPImpulsesVerticalGraph::draw");
diff --git a/lib/jkqtplotter/graphs/jkqtpimpulses.h b/lib/jkqtplotter/graphs/jkqtpimpulses.h
index 0e38dbf8c2..361fa99178 100644
--- a/lib/jkqtplotter/graphs/jkqtpimpulses.h
+++ b/lib/jkqtplotter/graphs/jkqtpimpulses.h
@@ -27,53 +27,71 @@
 
 
 
-/*! \brief This implements an impulse plot with impulses in direction of the X axis (i.e. from y=0 to y=f(x) )
-    \ingroup jkqtplotter_barssticks
-
-    \image html plot_impulsesxplots.png
-
-    \see JKQTPImpulsesVerticalGraph, \ref JKQTPlotterImpulsePlots
+/** \brief This is a base class for all impulse graphs
+ *  \ingroup jkqtplotter_barssticks
+ *
+ *  \see JKQTPImpulsesHorizontalGraph, JKQTPImpulsesVerticalGraph
  */
-class JKQTPLOTTER_LIB_EXPORT JKQTPImpulsesHorizontalGraph: public JKQTPXYBaselineGraph, public JKQTPGraphLineStyleMixin, public JKQTPGraphSymbolStyleMixin{
-        Q_OBJECT
-    public:
-        /** \brief class constructor */
-        JKQTPImpulsesHorizontalGraph(JKQTBasePlotter* parent=nullptr);
-        /** \brief class constructor */
-        JKQTPImpulsesHorizontalGraph(JKQTPlotter* parent);
+class JKQTPLOTTER_LIB_EXPORT JKQTPImpulsesGraphBase: public JKQTPXYBaselineGraph, public JKQTPGraphLineStyleMixin, public JKQTPGraphSymbolStyleMixin{
+    Q_OBJECT
+public:
+    /** \brief class constructor */
+    JKQTPImpulsesGraphBase(JKQTBasePlotter* parent=nullptr);
 
-        /** \brief plots the graph to the plotter object specified as parent */
-        virtual void draw(JKQTPEnhancedPainter& painter) override;
-        /** \brief plots a key marker inside the specified rectangle \a rect */
-        virtual void drawKeyMarker(JKQTPEnhancedPainter& painter, QRectF& rect) override;
-        /** \brief returns the color to be used for the key label */
-        virtual QColor getKeyLabelColor() const override;
 
-        /*! \brief color of symbols and impulses in one call */
-        virtual void setColor(QColor c);
+    /** \brief returns the color to be used for the key label */
+    virtual QColor getKeyLabelColor() const override;
+    /*! \copydoc drawSymbols */
+    bool getDrawSymbols() const;
 
-        /*! \copydoc drawSymbols */
-        void setDrawSymbols(bool __value);
-        /*! \copydoc drawSymbols */
-        bool getDrawSymbols() const;
+public slots:
+    /*! \brief color of symbols and impulses in one call */
+    virtual void setColor(QColor c);
 
-    protected:
+    /*! \copydoc drawSymbols */
+    void setDrawSymbols(bool __value);
 
-        /** \brief indicates whether to draw symbols at the top of the impulse
+protected:
+
+    /** \brief indicates whether to draw symbols at the top of the impulse
          *
          * \image html impulsesplot_symbols.png
          */
-        bool drawSymbols;
+    bool drawSymbols;
+};
+
+
+/** \brief This implements an impulse plot with impulses in direction of the X axis (i.e. from y=0 to y=f(x) )
+ *  \ingroup jkqtplotter_barssticks
+ *
+ *  \image html plot_impulsesxplots.png
+ *
+ *  \see JKQTPImpulsesVerticalGraph, \ref JKQTPlotterImpulsePlots
+ */
+class JKQTPLOTTER_LIB_EXPORT JKQTPImpulsesHorizontalGraph: public JKQTPImpulsesGraphBase {
+    Q_OBJECT
+public:
+    /** \brief class constructor */
+    JKQTPImpulsesHorizontalGraph(JKQTBasePlotter* parent=nullptr);
+    /** \brief class constructor */
+    JKQTPImpulsesHorizontalGraph(JKQTPlotter* parent);
+
+    /** \brief plots the graph to the plotter object specified as parent */
+    virtual void draw(JKQTPEnhancedPainter& painter) override;
+    /** \brief plots a key marker inside the specified rectangle \a rect */
+    virtual void drawKeyMarker(JKQTPEnhancedPainter& painter, QRectF& rect) override;
+
+protected:
 };
 
 
 
-/*! \brief This implements an impulse plot with impulses in direction of the X axis (i.e. from x=0 to x=f(y) )
-    \ingroup jkqtplotter_barssticks
-
-    \image html plot_impulsesxerrorsplots.png
-
-    \see jkqtpstatAddXErrorImpulsesGraph(), JKQTPImpulsesHorizontalGraph, \ref JKQTPlotterImpulsePlots
+/** \brief This implements an impulse plot with impulses in direction of the X axis (i.e. from x=0 to x=f(y) )
+ *  \ingroup jkqtplotter_barssticks
+ *
+ *  \image html plot_impulsesxerrorsplots.png
+ *
+ *  \see jkqtpstatAddXErrorImpulsesGraph(), JKQTPImpulsesHorizontalGraph, \ref JKQTPlotterImpulsePlots
  */
 class JKQTPLOTTER_LIB_EXPORT JKQTPImpulsesHorizontalErrorGraph: public JKQTPImpulsesHorizontalGraph, public JKQTPXGraphErrors {
         Q_OBJECT
@@ -100,7 +118,7 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPImpulsesHorizontalErrorGraph: public JKQTPImpu
 
     \see \ref JKQTPlotterImpulsePlots
  */
-class JKQTPLOTTER_LIB_EXPORT JKQTPImpulsesVerticalGraph: public JKQTPImpulsesHorizontalGraph {
+class JKQTPLOTTER_LIB_EXPORT JKQTPImpulsesVerticalGraph: public JKQTPImpulsesGraphBase {
         Q_OBJECT
     public:
         /** \brief class constructor */
@@ -110,6 +128,8 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPImpulsesVerticalGraph: public JKQTPImpulsesHor
 
         /** \brief plots the graph to the plotter object specified as parent */
         virtual void draw(JKQTPEnhancedPainter& painter) override;
+        /** \brief plots a key marker inside the specified rectangle \a rect */
+        virtual void drawKeyMarker(JKQTPEnhancedPainter& painter, QRectF& rect) override;
 };