NEW: barcharts and impulse graphs may now draw their baseline as stylable line (default: off)

.gitignore

@@ -101,3 +101,25 @@ Sicherungskopie_*
 /out
 *.synctex.gz
 *.bak
+/doc/images/JKQTPImpulsesHorizontalErrorGraphBaseline.png
+/doc/images/JKQTPImpulsesHorizontalErrorGraphBaseline_small.png
+/doc/images/JKQTPImpulsesHorizontalErrorGraphNoBaseline.png
+/doc/images/JKQTPImpulsesHorizontalErrorGraphNoBaseline_small.png
+/doc/images/JKQTPImpulsesHorizontalGraphBaseline_small.png
+/doc/images/JKQTPImpulsesHorizontalGraphNoBaseline_small.png
+/doc/images/JKQTPImpulsesVerticalErrorGraphBaseline.png
+/doc/images/JKQTPImpulsesVerticalErrorGraphBaseline_small.png
+/doc/images/JKQTPImpulsesVerticalErrorGraphNoBaseline.png
+/doc/images/JKQTPImpulsesVerticalErrorGraphNoBaseline_small.png
+/doc/images/JKQTPImpulsesVerticalGraphBaseline_small.png
+/doc/images/JKQTPImpulsesVerticalGraphNoBaseline_small.png
+/doc/images/JKQTPImpulsesVerticalGraph_SymbolsBaseline.png
+/doc/images/JKQTPImpulsesVerticalGraph_SymbolsBaseline_small.png
+/doc/images/JKQTPImpulsesVerticalGraph_SymbolsNoBaseline.png
+/doc/images/JKQTPImpulsesVerticalGraph_SymbolsNoBaseline_small.png
+/doc/images/JKQTPBarHorizontalGraphBaseline.png
+/doc/images/JKQTPBarHorizontalGraphBaseline_small.png
+/doc/images/JKQTPBarHorizontalGraphNoBaseline.png
+/doc/images/JKQTPBarHorizontalGraphNoBaseline_small.png
+/doc/images/JKQTPBarVerticalGraphBaseline_small.png
+/doc/images/JKQTPBarVerticalGraphNoBaseline_small.png

doc/CMakeLists.txt

@@ -193,7 +193,7 @@ if(JKQtPlotter_BUILD_EXAMPLES)
         stackedbars/JKQTPbarVerticalGraphStacked,JKQTPbarHorizontalGraphStacked/--smallscreenshotplot
         scatter/JKQTPXYScatterGraph,JKQTPXYScatterErrorGraph/--smallscreenshotplot
         simpletest/JKQTPXYLineGraph/--smallscreenshotplot
-        barchart/JKQTPBarVerticalGraph,JKQTPBarHorizontalGraph/--smallscreenshotplot
+        barchart/JKQTPBarVerticalGraph,JKQTPBarHorizontalGraph,JKQTPBarVerticalGraphNoBaseline,JKQTPBarHorizontalGraphNoBaseline,JKQTPBarVerticalGraphBaseline,JKQTPBarHorizontalGraphBaseline/--iteratefunctorsteps--smallscreenshotplot
         barchart_twocolor/JKQTPBarVerticalGraphTwoColorFilling,JKQTPBarHorizontalGraphTwoColorFilling/--smallscreenshotplot
         barchart_errorbars/JKQTPBarVerticalErrorGraph,JKQTPBarHorizontalErrorGraph/--smallscreenshotplot
         barchart_functorfill/JKQTPBarVerticalGraphFunctorFilling,JKQTPBarHorizontalGraphFunctorFilling/--smallscreenshotplot
@@ -204,7 +204,7 @@ if(JKQtPlotter_BUILD_EXAMPLES)
         filledgraphs_errors/JKQTPFilledCurveXErrorGraph,JKQTPFilledCurveYErrorGraph/--smallscreenshotplot
         evalcurve/JKQTPXYFunctionLineGraph/--smallscreenshotplot
         geo_coordinateaxis0/JKQTPCoordinateAxisStyleDrawMode0
-        impulsesplot/JKQTPImpulsesVerticalGraph,JKQTPImpulsesVerticalGraph_Symbols,JKQTPImpulsesHorizontalGraph,JKQTPImpulsesVerticalErrorGraph,JKQTPImpulsesHorizontalErrorGraph/--smallscreenshotplot
+        impulsesplot/JKQTPImpulsesVerticalGraph,JKQTPImpulsesVerticalGraph_Symbols,JKQTPImpulsesHorizontalGraph,JKQTPImpulsesVerticalErrorGraph,JKQTPImpulsesHorizontalErrorGraph,JKQTPImpulsesVerticalGraphNoBaseline,JKQTPImpulsesVerticalGraph_SymbolsNoBaseline,JKQTPImpulsesHorizontalGraphNoBaseline,JKQTPImpulsesVerticalErrorGraphNoBaseline,JKQTPImpulsesHorizontalErrorGraphNoBaseline,JKQTPImpulsesVerticalGraphBaseline,JKQTPImpulsesVerticalGraph_SymbolsBaseline,JKQTPImpulsesHorizontalGraphBaseline,JKQTPImpulsesVerticalErrorGraphBaseline,JKQTPImpulsesHorizontalErrorGraphBaseline/--iteratefunctorsteps--smallscreenshotplot
         symbols_and_errors/JKQTPXYLineErrorGraph_JKQTPErrorBars,JKQTPXYLineErrorGraph_JKQTPErrorLines,JKQTPXYLineErrorGraph_JKQTPErrorPolygons/--iteratefunctorsteps--iteratefunctorsteps_suppressinitial--smallscreenshotplot
         boxplot/JKQTPBoxplotVerticalGraph,JKQTPBoxplotHorizontalGraph/--iteratefunctorsteps--iteratefunctorsteps_suppressinitial--smallscreenshotplot
     )

doc/dox/whatsnew.dox

@@ -65,6 +65,7 @@ Changes, compared to  \ref page_whatsnew_V4_0_0 "v4.0.0" include:
     <li>NEW: barcharts may have rounded corners now, via JKQTPBarGraphBase::setRectRadius()</li>
     <li>NEW: barcharts can be colored by a user-specified functor</li>
     <li>NEW: you can provide a custom draw functor to barcharts to completely customize their look</li>
+    <li>NEW: barcharts and impulse graphs may now draw their baseline as stylable line (default: off)</li>
   </ul></li>
   
   <li>JKQTMathText:<ul>

examples/barchart/barchart.cpp

@@ -15,14 +15,13 @@
 
 
 template <class TCHART>
-void doExample(const QString& title)
+std::vector<TCHART*> doExample(JKQTPlotter& plot, const QString& title)
 {
     // 1. create a plotter window and get a pointer to the internal datastore (for convenience)
-    JKQTPlotter* plot=new JKQTPlotter();
-    plot->getPlotter()->setUseAntiAliasingForGraphs(true); // nicer (but slower) plotting
-    plot->getPlotter()->setUseAntiAliasingForSystem(true); // nicer (but slower) plotting
-    plot->getPlotter()->setUseAntiAliasingForText(true); // nicer (but slower) text rendering
-    JKQTPDatastore* ds=plot->getDatastore();
+    plot.getPlotter()->setUseAntiAliasingForGraphs(true); // nicer (but slower) plotting
+    plot.getPlotter()->setUseAntiAliasingForSystem(true); // nicer (but slower) plotting
+    plot.getPlotter()->setUseAntiAliasingForText(true); // nicer (but slower) text rendering
+    JKQTPDatastore* ds=plot.getDatastore();
 
     // 2. now we create data for three simple barchart
     QString L[Ndata]={  "cat. A", "cat. C", "cat. B", "cat. D", "other"}; // unsorted category axis
@@ -44,24 +43,24 @@ void doExample(const QString& title)
     size_t columnY3=ds->addCopiedColumn(Y3, Ndata, "y3");
 
     // 4. create graphs in the plot, which plots the dataset X/Y1, X/Y2 and X/Y3:
-    TCHART* graph1=new TCHART(plot);
+    TCHART* graph1=new TCHART(&plot);
     graph1->setBarPositionColumn(columnX);
     graph1->setBarHeightColumn(columnY1);
     graph1->setTitle(QObject::tr("dataset 1"));
-    TCHART* graph2=new TCHART(plot);
+    TCHART* graph2=new TCHART(&plot);
     graph2->setBarPositionColumn(columnX);
     graph2->setBarHeightColumn(columnY2);
     graph2->setTitle(QObject::tr("dataset 2"));
-    TCHART* graph3=new TCHART(plot);
+    TCHART* graph3=new TCHART(&plot);
     graph3->setBarPositionColumn(columnX);
     graph3->setBarHeightColumn(columnY3);
     graph3->setTitle(QObject::tr("dataset 3"));
 
 
     // 5. add the graphs to the plot, so it is actually displayed
-    plot->addGraph(graph1);
-    plot->addGraph(graph2);
-    plot->addGraph(graph3);
+    plot.addGraph(graph1);
+    plot.addGraph(graph2);
+    plot.addGraph(graph3);
 
     // 6. now we set the graphs, so they are plotted side-by-side
     //    This function searches all JKQTPBarHorizontalGraph in the current
@@ -73,16 +72,16 @@ void doExample(const QString& title)
         // 7. data is grouped into 5 numbere groups (1..5), but we also have string
         //    labels for these groups (stored in L). In order to display these labels,
         //    we have to tell the x-Axis to use these special labels:
-        plot->getXAxis()->addAxisTickLabels(X, L, Ndata);
+        plot.getXAxis()->addAxisTickLabels(X, L, Ndata);
         //    also we can rotate the labels a bit (by 45 degree), so they fit better
-        plot->getXAxis()->setTickLabelAngle(45);
-        plot->getXAxis()->setTickLabelFontSize(12);
+        plot.getXAxis()->setTickLabelAngle(45);
+        plot.getXAxis()->setTickLabelFontSize(12);
     } else {
         // 7. data is grouped into 5 numbere groups (1..5), but we also have string
         //    labels for these groups (stored in L). In order to display these labels,
         //    we have to tell the x-Axis to use these special labels:
-        plot->getYAxis()->addAxisTickLabels(X, L, Ndata);
-        plot->getYAxis()->setTickLabelFontSize(12);
+        plot.getYAxis()->addAxisTickLabels(X, L, Ndata);
+        plot.getYAxis()->setTickLabelFontSize(12);
     }
 
     // 8. finally we move the plot key/legend to the outside, top-right
@@ -90,17 +89,19 @@ void doExample(const QString& title)
     //    NOTE: plot is a descendent of QWidget, which uses an internal object of
     //          type JKQTBasePlotter, which does the actual plotting.
     //          So many properties of the plot are only available in this internal
-    //          object, which you can access by plot->getPlotter().
-    plot->getPlotter()->setKeyPosition(JKQTPKeyOutsideTopRight);
-    plot->getPlotter()->setKeyLayout(JKQTPKeyLayoutOneRow);
+    //          object, which you can access by plot.getPlotter().
+    plot.getPlotter()->setKeyPosition(JKQTPKeyOutsideTopRight);
+    plot.getPlotter()->setKeyLayout(JKQTPKeyLayoutOneRow);
 
     // 9 autoscale the plot so the graph is contained
-    plot->zoomToFit();
+    plot.zoomToFit();
 
     // show plotter and make it a decent size
-    plot->setWindowTitle(title);
-    plot->show();
-    plot->resize(600/plot->devicePixelRatioF(),550/plot->devicePixelRatioF());
+    plot.setWindowTitle(title);
+    plot.show();
+    plot.resize(600/plot.devicePixelRatioF(),550/plot.devicePixelRatioF());
+
+    return {graph1, graph2, graph3};
 }
 
 int main(int argc, char* argv[])
@@ -109,9 +110,35 @@ int main(int argc, char* argv[])
     JKQTPAppSettingController highDPIController(argc,argv);
     JKQTPExampleApplication app(argc, argv);
 
+    JKQTPlotter plotV;
+    auto gV=doExample<JKQTPBarVerticalGraph>(plotV, "1: JKQTPBarVerticalGraph");
+    JKQTPlotter plotH;
+    auto gH=doExample<JKQTPBarHorizontalGraph>(plotH, "2: JKQTPBarHorizontalGraph");
 
-    doExample<JKQTPBarVerticalGraph>("1: JKQTPBarVerticalGraph");
-    doExample<JKQTPBarHorizontalGraph>("2: JKQTPBarHorizontalGraph");
+    app.addExportStepFunctor([&](){
+        for (auto g: gV) {
+            g->setDrawBaseline(false);
+        }
+        for (auto g: gH) {
+            g->setDrawBaseline(false);
+        }
+        plotV.getXAxis()->setShowZeroAxis(false);
+        plotV.getYAxis()->setShowZeroAxis(false);
+        plotH.getXAxis()->setShowZeroAxis(false);
+        plotH.getYAxis()->setShowZeroAxis(false);
+    });
 
+    app.addExportStepFunctor([&](){
+        for (auto g: gV) {
+            g->setDrawBaseline(true);
+        }
+        for (auto g: gH) {
+            g->setDrawBaseline(true);
+        }
+        plotV.getXAxis()->setShowZeroAxis(false);
+        plotV.getYAxis()->setShowZeroAxis(false);
+        plotH.getXAxis()->setShowZeroAxis(false);
+        plotH.getYAxis()->setShowZeroAxis(false);
+    });
     return app.exec();
 }

examples/impulsesplot/impulsesplot.cpp

@@ -80,7 +80,7 @@ int main(int argc, char* argv[])
 
     // 1. create a plotter window and get a pointer to the internal datastore (for convenience)
     JKQTPlotter plot;
-    drawPlot<JKQTPImpulsesVerticalGraph>(plot);
+    auto grV=drawPlot<JKQTPImpulsesVerticalGraph>(plot);
     plot.setWindowTitle("1: JKQTPImpulsesVerticalGraph");
 
     // 1. create a plotter window and get a pointer to the internal datastore (for convenience)
@@ -94,7 +94,7 @@ int main(int argc, char* argv[])
     grS->setSymbolSize(12);
 
     JKQTPlotter plotH;
-    drawPlot<JKQTPImpulsesHorizontalGraph>(plotH);
+    auto grH=drawPlot<JKQTPImpulsesHorizontalGraph>(plotH);
     plotH.setWindowTitle("3: JKQTPImpulsesHorizontalGraph");
     plotH.resize(400/plot.devicePixelRatioF(),600/plot.devicePixelRatioF());
 
@@ -109,6 +109,35 @@ int main(int argc, char* argv[])
     grEH->setLineWidth(4);
     plotEH.resize(400/plot.devicePixelRatioF(),600/plot.devicePixelRatioF());
 
+    app.addExportStepFunctor([&]() {
+        grV->setDrawBaseline(false);
+        grS->setDrawBaseline(false);
+        grH->setDrawBaseline(false);
+        grE->setDrawBaseline(false);
+        grEH->setDrawBaseline(false);
+
+        plot.getXAxis()->setShowZeroAxis(false);
+        plot.getYAxis()->setShowZeroAxis(false);
+
+        plotE.getXAxis()->setShowZeroAxis(false);
+        plotE.getYAxis()->setShowZeroAxis(false);
+
+        plotEH.getXAxis()->setShowZeroAxis(false);
+        plotEH.getYAxis()->setShowZeroAxis(false);
+
+        plotH.getXAxis()->setShowZeroAxis(false);
+        plotH.getYAxis()->setShowZeroAxis(false);
+
+        plotS.getXAxis()->setShowZeroAxis(false);
+        plotS.getYAxis()->setShowZeroAxis(false);
+    });
+    app.addExportStepFunctor([&]() {
+        grV->setDrawBaseline(true);
+        grS->setDrawBaseline(true);
+        grH->setDrawBaseline(true);
+        grE->setDrawBaseline(true);
+        grEH->setDrawBaseline(true);
+    });
 
     return app.exec();
 }

examples/libexampletools/jkqtpexampleapplication.cpp

@@ -195,11 +195,10 @@ int JKQTPExampleApplication::exec()
                 QWidget* w=widgets[i];
                 if (w->isVisible()) {
                     saveWidget(w, iVisible);
-                }
-
-            }
                     iVisible++;
                 }
+            }
+        }
         return 0;
     } else if (saveScreenshot||saveSmallScreenshot||saveScreenshotPlot||saveSmallScreenshotPlot) {
 

lib/jkqtplotter/graphs/jkqtpbarchart.cpp

@@ -61,6 +61,9 @@ void JKQTPBarVerticalGraph::draw(JKQTPEnhancedPainter& painter) {
 
     int imax=0;
     int imin=0;
+    double left=-1e6;
+    double right=1e6;
+    bool firstXY=true;
     if (getIndexRange(imin, imax)) {
         painter.save(); auto __finalpaint=JKQTPFinally([&painter]() {painter.restore();});
 
@@ -121,6 +124,14 @@ void JKQTPBarVerticalGraph::draw(JKQTPEnhancedPainter& painter) {
                         painter.setPen(p);
                     }
                     const QRectF r(QPointF(x, y), QPointF(xx, yy));
+                    if (firstXY) {
+                        left=r.left();
+                        right=r.right();
+                    } else {
+                        left=qMin(left, r.left());
+                        right=qMax(right, r.right());
+                    }
+                    firstXY=false;
                     if (usesCustomDrawFunctor()) {
                         if (m_customDrawFunctor) {
                             m_customDrawFunctor(painter, r, QPointF(xv,yv), Qt::Vertical, this);
@@ -145,6 +156,12 @@ void JKQTPBarVerticalGraph::draw(JKQTPEnhancedPainter& painter) {
             }
         }
 
+        if (getDrawBaseline() && left!=right && !hasStackParent()) {
+            painter.setPen(baselineStyle().getLinePen(painter, parent));
+            const double yb=transformY(getBaseline());
+            if (JKQTPIsOKFloat(yb)) painter.drawLine(left, yb, right, yb);
+        }
+
     }
     drawErrorsAfter(painter);
 }
@@ -225,6 +242,9 @@ void JKQTPBarHorizontalGraph::draw(JKQTPEnhancedPainter& painter) {
 
     int imax=0;
     int imin=0;
+    double top=0;
+    double bottom=0;
+    bool firstXY=true;
     if (getIndexRange(imin, imax)) {
 
         double x0=transformX(0);
@@ -288,6 +308,14 @@ void JKQTPBarHorizontalGraph::draw(JKQTPEnhancedPainter& painter) {
                             painter.setPen(p);
                         }
                         const QRectF r(QPointF(x, y), QPointF(xx, yy));
+                        if (firstXY) {
+                            top=r.top();
+                            bottom=r.bottom();
+                        } else {
+                            top=qMin(top, r.top());
+                            bottom=qMax(bottom, r.bottom());
+                        }
+                        firstXY=false;
                         if (usesCustomDrawFunctor()) {
                             if (m_customDrawFunctor) {
                                 m_customDrawFunctor(painter, r, QPointF(xv,yv), Qt::Horizontal, this);
@@ -309,6 +337,11 @@ void JKQTPBarHorizontalGraph::draw(JKQTPEnhancedPainter& painter) {
                 }
             }
         }
+        if (getDrawBaseline() && top!=bottom && !hasStackParent()) {
+            painter.setPen(baselineStyle().getLinePen(painter, parent));
+            const double xb=transformX(getBaseline());
+            if (JKQTPIsOKFloat(xb)) painter.drawLine(xb,top,xb,bottom);
+        }
     }
     drawErrorsAfter(painter);
 }

lib/jkqtplotter/graphs/jkqtpbarchartbase.cpp

@@ -40,11 +40,15 @@ JKQTPBarGraphBase::JKQTPBarGraphBase(JKQTBasePlotter* parent):
     m_fillMode(FillMode::SingleFilling),
     m_useCustomDrawFunctor(false),
     m_lineColorDerivationModeForSpecialFill(parent->getCurrentPlotterStyle().graphsStyle.barchartStyle.graphColorDerivationMode),
-    rectRadiusAtBaseline(0),rectRadiusAtValue(0)
+    rectRadiusAtBaseline(0),rectRadiusAtValue(0),
+    m_drawBaseline(parent->getCurrentPlotterStyle().graphsStyle.barchartStyle.drawBaseline)
 {
     initFillStyle(parent, parentPlotStyle, JKQTPPlotStyleType::Barchart);
     initLineStyle(parent, parentPlotStyle, JKQTPPlotStyleType::Barchart);
     m_fillStyleBelow.initFillStyleInvertedColor(this);
+    m_baselineStyle.setLineColor(parent->getCurrentPlotterStyle().xAxisStyle.colorZeroAxis);
+    m_baselineStyle.setLineStyle(Qt::SolidLine);
+    m_baselineStyle.setLineWidth(parent->getCurrentPlotterStyle().xAxisStyle.lineWidthZeroAxis);
     rectRadiusAtBaseline= parent->getCurrentPlotterStyle().graphsStyle.barchartStyle.defaultRectRadiusAtBaseline;
     rectRadiusAtValue= parent->getCurrentPlotterStyle().graphsStyle.barchartStyle.defaultRectRadiusAtValue;
 }
@@ -167,6 +171,26 @@ void JKQTPBarGraphBase::setWidth(double __value)
     this->width = __value;
 }
 
+void JKQTPBarGraphBase::setDrawBaseline(bool __value)
+{
+    m_drawBaseline=__value;
+}
+
+bool JKQTPBarGraphBase::getDrawBaseline() const
+{
+    return this->m_drawBaseline;
+}
+
+JKQTPGraphLineStyleMixin &JKQTPBarGraphBase::baselineStyle()
+{
+    return m_baselineStyle;
+}
+
+const JKQTPGraphLineStyleMixin &JKQTPBarGraphBase::baselineStyle() const
+{
+    return m_baselineStyle;
+}
+
 double JKQTPBarGraphBase::getWidth() const
 {
     return this->width;

lib/jkqtplotter/graphs/jkqtpbarchartbase.h

@@ -163,6 +163,12 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPBarGraphBase: public JKQTPXYBaselineGraph, pub
         JKQTPColorDerivationMode getLineColorDerivationModeForSpecialFill() const;
         /** \copydoc m_useCustomDrawFunctor */
         bool usesCustomDrawFunctor() const;
+        /** \copydoc m_drawBaseline */
+        bool getDrawBaseline() const;
+        /** \copydoc m_baselineStyle */
+        JKQTPGraphLineStyleMixin &baselineStyle();
+        /** \copydoc m_baselineStyle */
+        const JKQTPGraphLineStyleMixin& baselineStyle() const;
 
     public slots:
         /** \copydoc m_fillMode */
@@ -201,6 +207,8 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPBarGraphBase: public JKQTPXYBaselineGraph, pub
         void setShift(double __value);
         /** \copydoc width */
         void setWidth(double __value);
+        /** \copydoc m_drawBaseline */
+        void setDrawBaseline(bool __value);
 
         /** \copydoc rectRadiusAtValue */
         void setRectRadiusAtValue(double __value);
@@ -249,6 +257,20 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPBarGraphBase: public JKQTPXYBaselineGraph, pub
         double rectRadiusAtValue;
         /** \brief corner radius (in pt) for bars at the "baseline" end */
         double rectRadiusAtBaseline;
+        /** \brief if m_drawBaseline \c ==true then this style is used to draw the baseline
+         *
+         *  \see baselineStyle() , setDrawBaseline() , m_drawBaseline
+         */
+        JKQTPGraphLineStyleMixin m_baselineStyle;
+        /** \brief indicates whether to draw a line with style m_baselineStyle at the baseline-value
+         *
+         *  \image html JKQTPBarVerticalGraphBaseline.png "setDrawBaseline(true);"
+         *
+         *  \image html JKQTPBarVerticalGraphNoBaseline.png "setDrawBaseline(false);"
+         *
+         *  \see baselineStyle() , setDrawBaseline() , m_baselineStyle
+         */
+        bool m_drawBaseline;
         /** \brief specifies how the area of the graph is filles
          *
          *  \note If any fill style other than FillStyle::SingleFill is used, the peroperty m_lineColorDerivationModeForSpecialFill

lib/jkqtplotter/graphs/jkqtpimpulses.cpp

@@ -25,8 +25,6 @@
 #include <QDebug>
 #include <iostream>
 #include "jkqtplotter/jkqtptools.h"
-#include "jkqtplotter/graphs/jkqtpimage.h"
-#include "jkqtplotter/jkqtpbaseelements.h"
 #include "jkqtplotter/jkqtplotter.h"
 #define SmallestGreaterZeroCompare_xvsgz() if ((xvsgz>10.0*DBL_MIN)&&((smallestGreaterZero<10.0*DBL_MIN) || (xvsgz<smallestGreaterZero))) smallestGreaterZero=xvsgz;
 
@@ -36,10 +34,13 @@
 
 
 JKQTPImpulsesGraphBase::JKQTPImpulsesGraphBase(JKQTBasePlotter* parent):
-    JKQTPXYBaselineGraph(parent), drawSymbols(false)
+    JKQTPXYBaselineGraph(parent),
+    drawSymbols(false),
+    m_drawBaseline(parent->getCurrentPlotterStyle().graphsStyle.impulseStyle.drawBaseline)
 {
     initLineStyle(parent, parentPlotStyle, JKQTPPlotStyleType::Impulses);
     initSymbolStyle(parent, parentPlotStyle, JKQTPPlotStyleType::Impulses);
+    m_baselineStyle=*this;
 }
 
 QColor JKQTPImpulsesGraphBase::getKeyLabelColor() const {
@@ -53,6 +54,7 @@ void JKQTPImpulsesGraphBase::setColor(QColor c)
     setSymbolFillColor(JKQTPGetDerivedColor(parent->getCurrentPlotterStyle().graphsStyle.impulseStyle.fillColorDerivationMode, c));
     c.setAlphaF(0.5);
     setHighlightingLineColor(c);
+    m_baselineStyle.setLineColor(c);
 }
 
 void JKQTPImpulsesGraphBase::setDrawSymbols(bool __value)
@@ -65,6 +67,25 @@ bool JKQTPImpulsesGraphBase::getDrawSymbols() const
     return drawSymbols;
 }
 
+void JKQTPImpulsesGraphBase::setDrawBaseline(bool __value)
+{
+    m_drawBaseline=__value;
+}
+
+bool JKQTPImpulsesGraphBase::getDrawBaseline() const
+{
+    return this->m_drawBaseline;
+}
+
+JKQTPGraphLineStyleMixin &JKQTPImpulsesGraphBase::baselineStyle()
+{
+    return m_baselineStyle;
+}
+
+const JKQTPGraphLineStyleMixin &JKQTPImpulsesGraphBase::baselineStyle() const
+{
+    return m_baselineStyle;
+}
 
 bool JKQTPImpulsesGraphBase::getValuesMinMax(double &mmin, double &mmax, double &smallestGreaterZero)
 {
@@ -179,6 +200,9 @@ void JKQTPImpulsesHorizontalGraph::draw(JKQTPEnhancedPainter& painter) {
 
         int imax=0;
         int imin=0;
+        double bottom=-1e6;
+        double top=1e6;
+        bool firstXY=true;
         if (getIndexRange(imin, imax)) {
 
             double x0=transformX(getBaseline());
@@ -197,7 +221,14 @@ void JKQTPImpulsesHorizontalGraph::draw(JKQTPEnhancedPainter& painter) {
                 if (JKQTPIsOKFloat(xv) && JKQTPIsOKFloat(yv)) {
                     const double x=transformX(xv);
                     const double y=transformY(yv);
-
+                    if (firstXY) {
+                        bottom=y;
+                        top=y;
+                    } else {
+                        bottom=qMax(bottom, y);
+                        top=qMin(top, y);
+                    }
+                    firstXY=false;
                     lines.append(QLineF(x0, y, x, y));
                     points.append(QPointF(x,y));
 
@@ -212,6 +243,11 @@ void JKQTPImpulsesHorizontalGraph::draw(JKQTPEnhancedPainter& painter) {
                 }
             }
         }
+        if (getDrawBaseline() && top!=bottom) {
+            painter.setPen(baselineStyle().getLinePen(painter, parent));
+            const double xb=transformX(getBaseline());
+            if (JKQTPIsOKFloat(xb)) painter.drawLine(xb,top,xb,bottom);
+        }
 
     }
     drawErrorsAfter(painter);
@@ -322,13 +358,15 @@ void JKQTPImpulsesVerticalGraph::draw(JKQTPEnhancedPainter& painter) {
 
         int imax=0;
         int imin=0;
+        double left=-1e6;
+        double right=1e6;
+        bool firstXY=true;
         if (getIndexRange(imin, imax)) {
 
 
 
             double y0=transformY(getBaseline());
             if (parent->getYAxis()->isLogAxis()) {
-                y0=transformY(parent->getYAxis()->getMin());
                 if (getBaseline()>0 && getBaseline()>parent->getYAxis()->getMin()) y0=transformY(getBaseline());
                 else y0=transformY(parent->getYAxis()->getMin());
             }
@@ -342,6 +380,14 @@ void JKQTPImpulsesVerticalGraph::draw(JKQTPEnhancedPainter& painter) {
                 if (JKQTPIsOKFloat(xv) && JKQTPIsOKFloat(yv) ) {
                     const double x=transformX(xv);
                     const double y=transformY(yv);
+                    if (firstXY) {
+                        left=x;
+                        right=x;
+                    } else {
+                        left=qMin(left, x);
+                        right=qMax(right, x);
+                    }
+                    firstXY=false;
 
 
                     lines.append(QLineF(x, y0, x, y));
@@ -358,6 +404,11 @@ void JKQTPImpulsesVerticalGraph::draw(JKQTPEnhancedPainter& painter) {
                 }
             }
         }
+        if (getDrawBaseline() && left!=right) {
+            painter.setPen(baselineStyle().getLinePen(painter, parent));
+            const double yb=transformY(getBaseline());
+            if (JKQTPIsOKFloat(yb)) painter.drawLine(left, yb, right, yb);
+        }
     }
 
     drawErrorsAfter(painter);

lib/jkqtplotter/graphs/jkqtpimpulses.h

@@ -30,7 +30,11 @@
 /** \brief This is a base class for all impulse graphs
  *  \ingroup jkqtplotter_sticks
  *
- *  \image html JKQTPImpulsesVerticalGraph.png
+ *  \image html JKQTPImpulsesVerticalGraph.png "default style for impulse graphs"
+ *
+ *  \image html JKQTPImpulsesVerticalGraph_Symbols.png  "setDrawSymbols(true);"
+ *
+ *  \image html JKQTPImpulsesVerticalGraphBaseline.png "setDrawBaseline(true);"
  *
  *  \see JKQTPImpulsesHorizontalGraph, JKQTPImpulsesVerticalGraph
  */
@@ -45,6 +49,13 @@ public:
     virtual QColor getKeyLabelColor() const override;
     /** \copydoc drawSymbols */
     bool getDrawSymbols() const;
+    /** \copydoc m_drawBaseline */
+    bool getDrawBaseline() const;
+    /** \copydoc m_baselineStyle */
+    JKQTPGraphLineStyleMixin &baselineStyle();
+    /** \copydoc m_baselineStyle */
+    const JKQTPGraphLineStyleMixin& baselineStyle() const;
+
 
 public slots:
     /** \brief color of symbols and impulses in one call  */
@@ -52,14 +63,29 @@ public slots:
 
     /** \copydoc drawSymbols */
     void setDrawSymbols(bool __value);
+    /** \copydoc m_drawBaseline */
+    void setDrawBaseline(bool __value);
 
 protected:
 
     /** \brief indicates whether to draw symbols at the top of the impulse
      *
-         * \image html impulsesplot_symbols.png
+     * \image html JKQTPImpulsesVerticalGraph_Symbols.png "setDrawSymbols(true)"
      */
     bool drawSymbols;
+    /** \brief if m_drawBaseline \c ==true then this style is used to draw the baseline
+     *
+     *  \see baselineStyle() , setDrawBaseline() , m_drawBaseline
+     */
+    JKQTPGraphLineStyleMixin m_baselineStyle;
+    /** \brief indicates whether to draw a line with style m_baselineStyle at the baseline-value
+     *
+     * \image html JKQTPImpulsesVerticalGraphBaseline.png "setDrawBaseline(true);"
+     * \image html JKQTPImpulsesVerticalGraphNoBaseline.png "setDrawBaseline(false);"
+     *
+     *  \see baselineStyle() , setDrawBaseline() , m_baselineStyle
+     */
+    bool m_drawBaseline;
 
     /** \brief get the maximum and minimum value in the impulse-elongation (i.e. value) direction of the graph
      *

lib/jkqtplotter/jkqtpgraphsbasestyle.cpp

@@ -201,7 +201,7 @@ JKQTGraphsBaseStyle::JKQTGraphsBaseStyle(const JKQTBasePlotterStyle& parent):
     barchartStyle(parent),
     boxplotStyle(JKQTPPlotStyleType::Boxplot, parent),
     filledStyle(JKQTPPlotStyleType::Filled, parent),
-    impulseStyle(JKQTPPlotStyleType::Impulses, parent),
+    impulseStyle(parent),
     geometricStyle(parent),
     annotationStyle(parent),
     defaultPalette(JKQTPMathImageColorPalette::JKQTPMathImageMATLAB)
@@ -290,7 +290,7 @@ void JKQTGraphsBaseStyle::loadSettings(const QSettings &settings, const QString
     barchartStyle.loadSettings(settings, group+"graphs_barchart/", JKQTBarchartSpecificStyleProperties(parent, defaultGraphStyle));
     boxplotStyle.loadSettings(settings, group+"graphs_boxplot/", JKQTGraphsSpecificStyleProperties(JKQTPPlotStyleType::Boxplot, defaultGraphStyle));
     filledStyle.loadSettings(settings, group+"graphs_filled/", JKQTGraphsSpecificStyleProperties(JKQTPPlotStyleType::Filled, defaultGraphStyle));
-    impulseStyle.loadSettings(settings, group+"graphs_impulses/",JKQTGraphsSpecificStyleProperties(JKQTPPlotStyleType::Impulses,  defaultGraphStyle));
+    impulseStyle.loadSettings(settings, group+"graphs_impulses/", JKQTImpulseSpecificStyleProperties(parent,  defaultGraphStyle));
     geometricStyle.loadSettings(settings, group+"graphs_geometric/", JKQTGeometricSpecificStyleProperties(parent, defaultGraphStyle));
     annotationStyle.loadSettings(settings, group+"graphs_annotation/", JKQTAnnotationsSpecificStyleProperties(parent, defaultGraphStyle));
 
@@ -358,7 +358,8 @@ const JKQTGraphsSpecificStyleProperties &JKQTGraphsBaseStyle::getGraphStyleByTyp
 JKQTBarchartSpecificStyleProperties::JKQTBarchartSpecificStyleProperties(const JKQTBasePlotterStyle& parent):
     JKQTGraphsSpecificStyleProperties(JKQTPPlotStyleType::Barchart, parent),
     defaultRectRadiusAtValue(0),
-    defaultRectRadiusAtBaseline(0)
+    defaultRectRadiusAtBaseline(0),
+    drawBaseline(false)
 {
 
 }
@@ -366,7 +367,8 @@ JKQTBarchartSpecificStyleProperties::JKQTBarchartSpecificStyleProperties(const J
 JKQTBarchartSpecificStyleProperties::JKQTBarchartSpecificStyleProperties(const JKQTBasePlotterStyle& parent, const JKQTGraphsSpecificStyleProperties &other):
     JKQTGraphsSpecificStyleProperties(JKQTPPlotStyleType::Barchart, other),
     defaultRectRadiusAtValue(0),
-    defaultRectRadiusAtBaseline(0)
+    defaultRectRadiusAtBaseline(0),
+    drawBaseline(false)
 {
 
 }
@@ -376,6 +378,7 @@ void JKQTBarchartSpecificStyleProperties::loadSettings(const QSettings &settings
     JKQTGraphsSpecificStyleProperties::loadSettings(settings, group, defaultStyle);
     defaultRectRadiusAtValue=settings.value(group+"radius_at_value", defaultStyle.defaultRectRadiusAtValue).toDouble();
     defaultRectRadiusAtBaseline=settings.value(group+"radius_at_baseline", defaultStyle.defaultRectRadiusAtBaseline).toDouble();
+    drawBaseline=settings.value(group+"draw_baseline", defaultStyle.drawBaseline).toBool();
 }
 
 void JKQTBarchartSpecificStyleProperties::saveSettings(QSettings &settings, const QString &group) const
@@ -383,6 +386,35 @@ void JKQTBarchartSpecificStyleProperties::saveSettings(QSettings &settings, cons
     JKQTGraphsSpecificStyleProperties::saveSettings(settings, group);
     settings.setValue(group+"radius_at_value", defaultRectRadiusAtValue);
     settings.setValue(group+"radius_at_baseline", defaultRectRadiusAtBaseline);
+    settings.setValue(group+"draw_baseline", drawBaseline);
+
+}
+
+
+JKQTImpulseSpecificStyleProperties::JKQTImpulseSpecificStyleProperties(const JKQTBasePlotterStyle& parent):
+    JKQTGraphsSpecificStyleProperties(JKQTPPlotStyleType::Impulses, parent),
+    drawBaseline(false)
+{
+
+}
+
+JKQTImpulseSpecificStyleProperties::JKQTImpulseSpecificStyleProperties(const JKQTBasePlotterStyle& parent, const JKQTGraphsSpecificStyleProperties &other):
+    JKQTGraphsSpecificStyleProperties(JKQTPPlotStyleType::Impulses, other),
+    drawBaseline(false)
+{
+
+}
+
+void JKQTImpulseSpecificStyleProperties::loadSettings(const QSettings &settings, const QString &group, const JKQTImpulseSpecificStyleProperties &defaultStyle)
+{
+    JKQTGraphsSpecificStyleProperties::loadSettings(settings, group, defaultStyle);
+    drawBaseline=settings.value(group+"draw_baseline", defaultStyle.drawBaseline).toBool();
+}
+
+void JKQTImpulseSpecificStyleProperties::saveSettings(QSettings &settings, const QString &group) const
+{
+    JKQTGraphsSpecificStyleProperties::saveSettings(settings, group);
+    settings.setValue(group+"draw_baseline", drawBaseline);
 
 }
 

lib/jkqtplotter/jkqtpgraphsbasestyle.h

@@ -244,11 +244,53 @@ public:
     double defaultRectRadiusAtValue;
     /** \brief corner radius (in pt) for bars at the "baseline" end */
     double defaultRectRadiusAtBaseline;
+    /** \brief indicates whether to draw a baseline (style is derived from axis style) */
+    bool drawBaseline;
 
 
 };
 
 
+
+/** \brief Support Class for JKQTBasePlotter, which summarizes all properties that define the visual styling of impulse/stick graph elements
+*  \ingroup jkqtpplotter_styling_classes
+*
+*  \see JKQTBasePlotter, \ref jkqtpplotter_styling
+*/
+class JKQTPLOTTER_LIB_EXPORT JKQTImpulseSpecificStyleProperties: public JKQTGraphsSpecificStyleProperties {
+#ifndef JKQTPLOTTER_WORKAROUND_QGADGET_BUG
+     Q_GADGET
+#endif
+public:
+    JKQTImpulseSpecificStyleProperties(const JKQTBasePlotterStyle& parent);
+    JKQTImpulseSpecificStyleProperties(const JKQTBasePlotterStyle& parent, const JKQTGraphsSpecificStyleProperties& other);
+    JKQTImpulseSpecificStyleProperties(const JKQTImpulseSpecificStyleProperties& other)=default;
+    JKQTImpulseSpecificStyleProperties(JKQTImpulseSpecificStyleProperties&& other)=default;
+    JKQTImpulseSpecificStyleProperties& operator=(const JKQTImpulseSpecificStyleProperties& other)=default;
+    JKQTImpulseSpecificStyleProperties& operator=(JKQTImpulseSpecificStyleProperties&& other)=default;
+
+
+    /** \brief loads the plot properties from a <a href="http://doc.qt.io/qt-5/qsettings.html")">QSettings</a> object
+        *
+        *  \param settings QSettings-object to read from
+        *  \param group Group in the QSettings-object to read from
+        *  \param defaultStyle If a setting cannot be found in \a settings, default values are taken from this object
+        *                      By default, this is a default-constructed object
+        */
+    void loadSettings(const QSettings &settings, const QString& group, const JKQTImpulseSpecificStyleProperties &defaultStyle);
+
+    /** \brief saves the plot properties into a <a href="http://doc.qt.io/qt-5/qsettings.html")">QSettings</a> object.
+        *
+        *  \param settings QSettings-object to save to
+        *  \param group Group in the QSettings-object to save to
+        */
+    void saveSettings(QSettings& settings, const QString& group) const;
+
+    /** \brief indicates whether to draw a baseline (style is derived from axis style) */
+    bool drawBaseline;
+
+
+};
 /** \brief Support Class for JKQTBasePlotter, which summarizes all properties that define the visual styling of a JKQTBasePlotter
  *  \ingroup jkqtpplotter_styling_classes
  *
@@ -297,7 +339,7 @@ class JKQTPLOTTER_LIB_EXPORT JKQTGraphsBaseStyle {
         /** \brief styling options for filled graphs */
         JKQTGraphsSpecificStyleProperties filledStyle;
         /** \brief styling options for impulses graphs */
-        JKQTGraphsSpecificStyleProperties impulseStyle;
+        JKQTImpulseSpecificStyleProperties impulseStyle;
         /** \brief styling options for geometric elements */
         JKQTGeometricSpecificStyleProperties geometricStyle;
 		/** \brief styling options for annotation elements */

lib/jkqtplotter/jkqtpgraphsbasestylingmixins.h

@@ -125,6 +125,24 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPGraphLineStyleMixin {
         QColor getHighlightingLineColor() const;
 
 
+
+
+        /** \brief returns the linewidth for drawing lines in a key entry with \a keyRect for the symbol, using \a painter and \a parent  . */
+        double getKeyLineWidthPx(JKQTPEnhancedPainter &painter, const QRectF &keyRect, const JKQTBasePlotter *parent) const;
+
+        /** \brief constructs a QPen from the line styling properties */
+        QPen getLinePen(JKQTPEnhancedPainter &painter, JKQTBasePlotter* parent) const;
+        /** \brief constructs a QPen from the line styling properties, suitable for drawing rectangles with sharp edges */
+        QPen getLinePenForRects(JKQTPEnhancedPainter &painter, JKQTBasePlotter* parent) const;
+        /** \brief constructs a QPen from the line styling properties */
+        QPen getHighlightingLinePen(JKQTPEnhancedPainter &painter, JKQTBasePlotter* parent) const;
+        /** \brief constructs a QPen from the line styling properties, suitable for drawing rectangle with sharp corners */
+        QPen getHighlightingLinePenForRects(JKQTPEnhancedPainter &painter, JKQTBasePlotter* parent) const;
+        /** \brief constructs a QPen from the line styling properties, but uses getKeyLineWidthPx() for the width, i.e. constructs a pen for drawing lines in key-symbols */
+        QPen getKeyLinePen(JKQTPEnhancedPainter &painter, const QRectF &rect, JKQTBasePlotter *parent) const;
+
+
+
 #ifndef JKQTPLOTTER_WORKAROUND_QGADGET_BUG
         Q_PROPERTY(QColor highlightingLineColor MEMBER m_highlightingLineColor READ getHighlightingLineColor WRITE setHighlightingLineColor)
         Q_PROPERTY(QColor lineColor MEMBER m_lineColor READ getLineColor WRITE setLineColor)
@@ -139,19 +157,6 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPGraphLineStyleMixin {
         /** \brief line pen for the highlighted look */
         QColor m_highlightingLineColor;
     protected:
-        /** \brief returns the linewidth for drawing lines in a key entry with \a keyRect for the symbol, using \a painter and \a parent  . */
-        double getKeyLineWidthPx(JKQTPEnhancedPainter &painter, const QRectF &keyRect, const JKQTBasePlotter *parent) const;
-
-        /** \brief constructs a QPen from the line styling properties */
-        QPen getLinePen(JKQTPEnhancedPainter &painter, JKQTBasePlotter* parent) const;
-        /** \brief constructs a QPen from the line styling properties, suitable for drawing rectangles with sharp edges */
-        QPen getLinePenForRects(JKQTPEnhancedPainter &painter, JKQTBasePlotter* parent) const;
-        /** \brief constructs a QPen from the line styling properties */
-        QPen getHighlightingLinePen(JKQTPEnhancedPainter &painter, JKQTBasePlotter* parent) const;
-        /** \brief constructs a QPen from the line styling properties, suitable for drawing rectangle with sharp corners */
-        QPen getHighlightingLinePenForRects(JKQTPEnhancedPainter &painter, JKQTBasePlotter* parent) const;
-        /** \brief constructs a QPen from the line styling properties, but uses getKeyLineWidthPx() for the width, i.e. constructs a pen for drawing lines in key-symbols */
-        QPen getKeyLinePen(JKQTPEnhancedPainter &painter, const QRectF &rect, JKQTBasePlotter *parent) const;
 };