JKQTPlotter: NEW: added new error indicator styles JKQTPErrorHalfBarsOutwards, JKQTPErrorHalfBarsInwards, JKQTPErrorHalfBarsAbove, JKQTPErrorHalfBarsBelow which are especially useful for barcharts

JKQTPlotter: added example for barcharts with errorbars

doc/dox/examples_and_tutorials.dox

@@ -40,9 +40,12 @@ All test-projects are Qt-projects that use qmake to build. You can load them int
 <tr><td> \image html barchart_small.png
     <td> \subpage JKQTPlotterBarcharts
     <td> `JKQTPBarVerticalGraph` <br> C-style arrays of data 
+<tr><td> \image html barchart_errorbars_small.png
+    <td> \subpage JKQTPlotterBarchartsErrorBars
+    <td> `JKQTPBarVerticalErrorGraph` <br>  JKQTPDatastore::addColumnCalculatedFromColumn()
 <tr><td> \image html barchart_twocolor_small.png
     <td> \subpage JKQTPlotterBarchartsTwoColorFilling
-    <td> `JKQTPBarVerticalGraph` <br> 
+    <td> `JKQTPBarVerticalGraph` <br> JKQTPDatastore::addColumnCalculatedFromColumn()
 <tr><td> \image html stackedbars_small.png
     <td> \subpage JKQTPlotterStackedBarChart
     <td> `JKQTPBarVerticalStackableGraph`, `JKQTPBarHorizontalStackableGraph` <br> C++-style vectors of data 
@@ -52,6 +55,9 @@ All test-projects are Qt-projects that use qmake to build. You can load them int
 <tr><td> \image html wiggleplots_small.png
     <td> \subpage JKQTPlotterWigglePlots
     <td> `JKQTPFilledCurveXGraph`/`JKQTPFilledCurveYGraph` <br> setting/altering data in `JKQTPDatstore` directly <br>  data-depentend coloring <br> random-walks <br> seismographic data
+<tr><td> \image html filledgraphs_errors_small.png
+    <td> \subpage JKQTPlotterFilledGraphsErrorBars
+    <td> `JKQTPFilledCurveXErrorGraph`/`JKQTPFilledCurveYErrorGraph` 
 <tr><td> \image html impulsesplot_small.png
     <td> \subpage JKQTPlotterImpulsePlots
     <td> `JKQTPImpulsesVerticalGraph` and `JKQTPImpulsesHorizontalGraph` <br> C++-style QVector as plot data 

doc/dox/whatsnew.dox

@@ -48,6 +48,7 @@ Changes, compared to  \ref page_whatsnew_V4_0_0 "v4.0.0" include:
     <li>NEW: added property drawLineInForeground to JKQTPXYLineGraph and JKQTPXYParametrizedScatterGraph</li>
     <li>NEW: added JKQTPXYGraph::setKeyColumn()/JKQTPXYGraph::getKeyColumn() and  JKQTPXYGraph::setValueColumn()/JKQTPXYGraph::getValueColumn() and corresponding functions in other classes. In most graph classes they point to xColumn for key and yColumn for values. These functions are virtual and overwritten in derived classes with horizontally oriented graphs, where they point to yColumn for key and yColumn for value. This way you can write generic code with classes for both orientations.</li>
     <li>NEW: barcharts (derived from JKQTPBarGraphBase) can be configured to use different fill styles above and below the baseline, see JKQTPBarGraphBase::FillMode </li>
+    <li>NEW: added new error indicator styles JKQTPErrorHalfBarsOutwards, JKQTPErrorHalfBarsInwards, JKQTPErrorHalfBarsAbove, JKQTPErrorHalfBarsBelow which are especially useful for barcharts</li>
   </ul></li>
   
   <li>JKQTMathText:<ul>

examples/CMakeLists.txt

@@ -48,6 +48,7 @@ add_subdirectory(jkqtplot_test)
 add_subdirectory(advplotstyling)
 add_subdirectory(barchart)
 add_subdirectory(boxplot)
+add_subdirectory(barchart_errorbars)
 add_subdirectory(barchart_twocolor)
 add_subdirectory(contourplot)
 add_subdirectory(datastore)
@@ -61,6 +62,7 @@ add_subdirectory(distributionplot)
 add_subdirectory(errorbarstyles)
 add_subdirectory(evalcurve)
 add_subdirectory(filledgraphs)
+add_subdirectory(filledgraphs_errors)
 add_subdirectory(functionplot)
 add_subdirectory(geo_arrows)
 add_subdirectory(geo_simple)

examples/barchart_errorbars/CMakeLists.txt

@@ -0,0 +1,34 @@
+cmake_minimum_required(VERSION 3.16)
+
+set(EXAMPLE_NAME barchart_errorbars)
+set(EXENAME jkqtptest_${EXAMPLE_NAME})
+
+message( STATUS "..   Building Example ${EXAMPLE_NAME}" )
+
+
+# Set up source files
+set(SOURCES barchart_errorbars.cpp )
+set(HEADERS  )
+set(RESOURCES  )
+set(UIS  )
+
+add_executable(${EXENAME} WIN32 ${SOURCES} ${HEADERS} ${RESOURCES} ${UIS})
+target_link_libraries(${EXENAME} JKQTPExampleToolsLib)
+target_include_directories(${EXENAME} PRIVATE ../../lib)
+if(JKQtPlotter_BUILD_STATIC_LIBS)
+    target_link_libraries(${EXENAME} JKQTPlotterLib)
+elseif(JKQtPlotter_BUILD_SHARED_LIBS)
+    target_link_libraries(${EXENAME} JKQTPlotterSharedLib)
+endif()
+
+# precomiled headers to speed up compilation
+if (JKQtPlotter_BUILD_WITH_PRECOMPILED_HEADERS)
+  target_precompile_headers(${EXENAME} REUSE_FROM jkqtptest_simpletest)
+endif (JKQtPlotter_BUILD_WITH_PRECOMPILED_HEADERS)
+
+
+# Installation
+install(TARGETS ${EXENAME} RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+
+#Installation of Qt DLLs on Windows
+jkqtplotter_deployqt(${EXENAME})

examples/barchart_errorbars/README.md

@@ -0,0 +1,62 @@
+# Example (JKQTPlotter): Barchart With Error Bars {#JKQTPlotterBarchartsErrorBars}
+This project (see [`barchart_errorbars`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/barchart_errorbars) shows how to draw barcharts with different styles of error indicators.
+
+The source code of the main application is (see [`barchart_errorbars.cpp`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/barchart_errorbars/barchart_errorbars.cpp):
+```.cpp
+    // 1. create a plotter window and get a pointer to the internal datastore (for convenience)
+    JKQTPDatastore* ds=plot.getDatastore();
+
+    // 2. now we create three columns for key and value
+    size_t columnK=ds->addLinearColumn(6, 0.4*JKQTPSTATISTICS_PI, 2.2*JKQTPSTATISTICS_PI,"k");
+    size_t columnV=ds->addColumnCalculatedFromColumn(columnK, &cos, "v");
+    size_t columnE=ds->addColumnCalculatedFromColumn(columnK, [](double x) { return 0.05+0.06*(1.0+sin(x)); }, "error");
+
+    // 3. create a graph in the plot, which plots the dataset with symmetric:
+    JKQTPBarVerticalErrorGraph* graph1=new JKQTPBarVerticalErrorGraph(&plot);
+    graph1->setKeyColumn(columnK);
+    graph1->setValueColumn(columnV);
+    graph1->setBarErrorColumn(columnE);
+    // set error indicator style
+    graph1->setBarErrorStyle(JKQTPErrorBars);
+    graph1->setTitle(QObject::tr("JKQTPErrorBars"));
+    plot.addGraph(graph1);
+
+    // 4. create a second graph in the plot, which plots the second dataset with outer error bars only:
+    JKQTPBarVerticalErrorGraph* graph2=new JKQTPBarVerticalErrorGraph(&plot);
+    graph2->setKeyColumn(columnK);
+    graph2->setValueColumn(columnV);
+    graph2->setBarErrorColumn(columnE);
+    // set error indicator style
+    graph2->setBarErrorStyle(JKQTPErrorHalfBarsOutwards);
+    graph2->setTitle(QObject::tr("JKQTPErrorHalfBarsOutwards"));
+    plot.addGraph(graph2);
+
+    // 5. now we set the graphs, so they are plotted side-by-side
+    //    This function searches all JKQTPBarHorizontalGraph in the current
+    //    plot and sets their shift/scale so they form a nice plot with
+    //    side-by-side groups
+    graph1->autoscaleBarWidthAndShift(0.9, 0.9);
+
+
+    // 6 autoscale the plot so the graph is contained
+    plot.zoomToFit();
+
+    // 7. show plotter and make it a decent size
+    plot.getPlotter()->setKeyPosition(JKQTPKeyInsideTopLeft);
+    plot.setWindowTitle(title);
+    plot.show();
+    plot.resize(400,400);
+```
+
+
+The result looks like this:
+
+![barchart_errorbars](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/barchart_errorbars.png)
+
+
+
+In order to draw horizontal error bars, you have to use `JKQTPBarHorizontalErrorGraph` instead of `JKQTPBarVerticalErrorGraph`:
+
+![barchart_errorbars_hor](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/barchart_errorbars_hor.png)
+
+

examples/barchart_errorbars/barchart_errorbars.cpp

@@ -0,0 +1,77 @@
+/** \example barchart_errorbars.cpp
+ * Shows how to draw Barcharts with errorbars in a JKQTPlotter
+ *
+ * \ref JKQTPlotterBarchartsErrorBars
+ */
+
+#include "jkqtpexampleapplication.h"
+#include <QApplication>
+#include "jkqtplotter/jkqtplotter.h"
+#include "jkqtplotter/graphs/jkqtpscatter.h"
+#include "jkqtplotter/graphs/jkqtpbarchart.h"
+#include "jkqtpexampleapplication.h"
+#include "jkqtcommon/jkqtpmathtools.h"
+
+
+
+template <class TCHART>
+void doExample(JKQTPlotter& plot, const QString& title)
+{
+    // 1. create a plotter window and get a pointer to the internal datastore (for convenience)
+    JKQTPDatastore* ds=plot.getDatastore();
+
+    // 2. now we create three columns for key and value
+    size_t columnK=ds->addLinearColumn(6, 0.4*JKQTPSTATISTICS_PI, 2.2*JKQTPSTATISTICS_PI,"k");
+    size_t columnV=ds->addColumnCalculatedFromColumn(columnK, &cos, "v");
+    size_t columnE=ds->addColumnCalculatedFromColumn(columnK, [](double x) { return 0.05+0.06*(1.0+sin(x)); }, "error");
+
+    // 3. create a graph in the plot, which plots the dataset with symmetric:
+    TCHART* graph1=new TCHART(&plot);
+    graph1->setKeyColumn(columnK);
+    graph1->setValueColumn(columnV);
+    graph1->setBarErrorColumn(columnE);
+    // set error indicator style
+    graph1->setBarErrorStyle(JKQTPErrorBars);
+    graph1->setTitle(QObject::tr("JKQTPErrorBars"));
+    plot.addGraph(graph1);
+
+    // 4. create a second graph in the plot, which plots the second dataset with outer error bars only:
+    TCHART* graph2=new TCHART(&plot);
+    graph2->setKeyColumn(columnK);
+    graph2->setValueColumn(columnV);
+    graph2->setBarErrorColumn(columnE);
+    // set error indicator style
+    graph2->setBarErrorStyle(JKQTPErrorHalfBarsOutwards);
+    graph2->setTitle(QObject::tr("JKQTPErrorHalfBarsOutwards"));
+    plot.addGraph(graph2);
+
+    // 5. now we set the graphs, so they are plotted side-by-side
+    //    This function searches all JKQTPBarHorizontalGraph in the current
+    //    plot and sets their shift/scale so they form a nice plot with
+    //    side-by-side groups
+    graph1->autoscaleBarWidthAndShift(0.9, 0.9);
+
+
+    // 6 autoscale the plot so the graph is contained
+    plot.zoomToFit();
+
+    // 7. show plotter and make it a decent size
+    plot.getPlotter()->setKeyPosition(JKQTPKeyInsideTopLeft);
+    plot.setWindowTitle(title);
+    plot.show();
+    plot.resize(400,400);
+}
+
+int main(int argc, char* argv[])
+{
+
+    JKQTPAppSettingController highDPIController(argc,argv);
+    JKQTPExampleApplication app(argc, argv);
+
+
+    JKQTPlotter plotV, plotH;
+    doExample<JKQTPBarVerticalErrorGraph>(plotV, "1: JKQTPBarVerticalErrorGraph");
+    doExample<JKQTPBarHorizontalErrorGraph>(plotH, "2: JKQTPBarHorizontalErrorGraph");
+
+    return app.exec();
+}

lib/jkqtplotter/graphs/jkqtpbarchart.cpp

@@ -363,12 +363,51 @@ bool JKQTPBarHorizontalErrorGraph::usesColumn(int c) const
 bool JKQTPBarHorizontalErrorGraph::getXMinMax(double &minx, double &maxx, double &smallestGreaterZero)
 {
     if (xErrorColumn<0 || xErrorStyle==JKQTPNoError) {
-        return JKQTPBarHorizontalGraph::getXMinMax(minx, maxx, smallestGreaterZero);
-    } else {
-        bool start=false;
         minx=0;
         maxx=0;
         smallestGreaterZero=0;
+        if (getBaseline()>0) {
+            smallestGreaterZero=getBaseline();
+            minx=getBaseline();
+            maxx=getBaseline();
+        }
+
+        if (parent==nullptr) return false;
+
+        JKQTPDatastore* datastore=parent->getDatastore();
+        int imax=0;
+        int imin=0;
+        if (getIndexRange(imin, imax)) {
+
+
+            for (int i=imin; i<imax; i++) {
+                double yv=getBaseline();
+                if (JKQTPIsOKFloat(yv)) {
+                    if (yv>maxx) maxx=yv;
+                    if (yv<minx) minx=yv;
+                    double xvsgz;
+                    xvsgz=yv; SmallestGreaterZeroCompare_xvsgz();
+                }
+                yv=datastore->get(static_cast<size_t>(xColumn),static_cast<size_t>(i));
+                if (JKQTPIsOKFloat(yv)) {
+                    if (yv>maxx) maxx=yv;
+                    if (yv<minx) minx=yv;
+                    double xvsgz;
+                    xvsgz=yv; SmallestGreaterZeroCompare_xvsgz();
+                }
+            }
+            return true;
+        }
+    } else {
+        bool start=false;
+        minx=getBaseline();
+        maxx=getBaseline();
+        smallestGreaterZero=0;
+        if (getBaseline()>0) {
+            smallestGreaterZero=getBaseline();
+            minx=getBaseline();
+            maxx=getBaseline();
+        }
 
         if (parent==nullptr) return false;
 
@@ -377,25 +416,25 @@ bool JKQTPBarHorizontalErrorGraph::getXMinMax(double &minx, double &maxx, double
         int imin=0;
         if (getIndexRange(imin, imax)) {
 
+
             for (int i=imin; i<imax; i++) {
+                const double yv=datastore->get(static_cast<size_t>(xColumn),static_cast<size_t>(i))+getXErrorU(i, datastore);
+                const double yvv=datastore->get(static_cast<size_t>(xColumn),static_cast<size_t>(i))-getXErrorL(i, datastore);
+                if (JKQTPIsOKFloat(yv) && JKQTPIsOKFloat(yvv) ) {
+                    if (start || yv>maxx) maxx=yv;
+                    if (start || yv<minx) minx=yv;
                     double xvsgz;
-                const double xv=datastore->get(static_cast<size_t>(xColumn),static_cast<size_t>(i))+getXErrorU(i, datastore);
-                const double xvv=datastore->get(static_cast<size_t>(xColumn),static_cast<size_t>(i))-getXErrorL(i, datastore);
-                if (JKQTPIsOKFloat(xv) && JKQTPIsOKFloat(xvv) ) {
-                    if (start || xv>maxx) maxx=xv;
-                    if (start || xv<minx) minx=xv;
-                    xvsgz=xv; SmallestGreaterZeroCompare_xvsgz();
-                    start=false;
-                    if (xvv>maxx) maxx=xvv;
-                    if (xvv<minx) minx=xvv;
-                    xvsgz=xvv; SmallestGreaterZeroCompare_xvsgz();
+                    xvsgz=yv; SmallestGreaterZeroCompare_xvsgz();
+                    if (start || yvv>maxx) maxx=yvv;
+                    if (start || yvv<minx) minx=yvv;
+                    xvsgz=yvv; SmallestGreaterZeroCompare_xvsgz();
                     start=false;
                 }
             }
             return !start;
         }
-        return false;
     }
+    return false;
 }
 
 void JKQTPBarHorizontalErrorGraph::drawErrorsAfter(JKQTPEnhancedPainter &painter)
@@ -416,6 +455,26 @@ int JKQTPBarHorizontalErrorGraph::getBarLowerErrorColumn() const
     return getXErrorColumnLower();
 }
 
+JKQTPErrorPlotstyle JKQTPBarHorizontalErrorGraph::getBarErrorStyle() const
+{
+    return getXErrorStyle();
+}
+
+bool JKQTPBarHorizontalErrorGraph::getBarErrorSymmetric() const
+{
+    return getXErrorSymmetric();
+}
+
+void JKQTPBarHorizontalErrorGraph::setBarErrorSymmetric(bool __value)
+{
+    setXErrorSymmetric(__value);
+}
+
+void JKQTPBarHorizontalErrorGraph::setBarErrorStyle(JKQTPErrorPlotstyle __value)
+{
+    setXErrorStyle(__value);
+}
+
 void JKQTPBarHorizontalErrorGraph::setBarErrorColumn(int column)
 {
     setXErrorColumn(column);
@@ -542,6 +601,26 @@ int JKQTPBarVerticalErrorGraph::getBarLowerErrorColumn() const
     return getYErrorColumnLower();
 }
 
+JKQTPErrorPlotstyle JKQTPBarVerticalErrorGraph::getBarErrorStyle() const
+{
+    return getYErrorStyle();
+}
+
+bool JKQTPBarVerticalErrorGraph::getBarErrorSymmetric() const
+{
+    return getYErrorSymmetric();
+}
+
+void JKQTPBarVerticalErrorGraph::setBarErrorSymmetric(bool __value)
+{
+    setYErrorSymmetric(__value);
+}
+
+void JKQTPBarVerticalErrorGraph::setBarErrorStyle(JKQTPErrorPlotstyle __value)
+{
+    setYErrorStyle(__value);
+}
+
 void JKQTPBarVerticalErrorGraph::setBarErrorColumn(int column)
 {
     setYErrorColumn(column);

lib/jkqtplotter/graphs/jkqtpbarchart.h

@@ -117,7 +117,7 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPBarVerticalGraph: public JKQTPBarGraphBase {
  *  \ingroup jkqtplotter_barssticks
  *
  *  This works much the same as JKQTPBarHorizontalGraph. Here is an example output:
- *  \image html plot_bargraphverploterr.png
+ *  \image html JKQTPBarVerticalErrorGraph.png
  *
  * \see jkqtpstatAddYErrorBarGraph(), JKQTPBarVerticalGraph, \ref JKQTPlotterBarcharts
  */
@@ -141,7 +141,16 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPBarVerticalErrorGraph: public JKQTPBarVertical
         int getBarErrorColumn() const;
         /** \brief returns the column that contains the lower bar height errors */
         int getBarLowerErrorColumn() const;
+        /** \brief returns the error style of the bar */
+        JKQTPErrorPlotstyle getBarErrorStyle() const;
+        /** \brief returns whether the errors of the bars are symmetric */
+        bool getBarErrorSymmetric() const;
+
     public slots:
+        /** \brief sets whether the errors of the bars are symmetric */
+        void setBarErrorSymmetric(bool __value);
+        /** \brief sets the error style of the bar */
+        void setBarErrorStyle(JKQTPErrorPlotstyle  __value);
         /** \brief sets the column that contains the bar height errors */
         void setBarErrorColumn(int column) ;
 
@@ -238,7 +247,7 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPBarHorizontalGraph: public JKQTPBarGraphBase {
  *  \ingroup jkqtplotter_barssticks
  *
  *  This works much the same as JKQTPBarHorizontalGraph. Here is an example output:
- *  \image html plot_bargraphhorploterr.png
+ *  \image html JKQTPBarHorizontalErrorGraph.png
  *
  * \see jkqtpstatAddXErrorBarGraph(), JKQTPBarHorizontalGraph, \ref JKQTPlotterBarcharts
  *
@@ -264,7 +273,16 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPBarHorizontalErrorGraph: public JKQTPBarHorizo
         int getBarErrorColumn() const;
         /** \brief returns the column that contains the lower bar height errors */
         int getBarLowerErrorColumn() const;
+        /** \brief returns the error style of the bar */
+        JKQTPErrorPlotstyle getBarErrorStyle() const;
+        /** \brief returns whether the errors of the bars are symmetric */
+        bool getBarErrorSymmetric() const;
+
     public slots:
+        /** \brief sets whether the errors of the bars are symmetric */
+        void setBarErrorSymmetric(bool __value);
+        /** \brief sets the error style of the bar */
+        void setBarErrorStyle(JKQTPErrorPlotstyle  __value);
         /** \brief sets the column that contains the bar height errors */
         void setBarErrorColumn(int column) ;
 

lib/jkqtplotter/jkqtpgraphsbaseerrors.cpp

@@ -393,8 +393,10 @@ void JKQTPGraphErrorStyleMixin::intPlotXYErrorIndicators(JKQTPEnhancedPainter& p
 
 
             //x-errorbars
-            if ((xErrorColumn>=0 || xErrorColumnLower>=0) && (xErrorStyle==JKQTPErrorBars || xErrorStyle==JKQTPErrorBarsLines|| xErrorStyle==JKQTPErrorBarsPolygons
-                || xErrorStyle==JKQTPErrorSimpleBars || xErrorStyle==JKQTPErrorSimpleBarsLines|| xErrorStyle==JKQTPErrorSimpleBarsPolygons)) {
+            if ((xErrorColumn>=0 || xErrorColumnLower>=0)
+                && (xErrorStyle==JKQTPErrorBars || xErrorStyle==JKQTPErrorBarsLines|| xErrorStyle==JKQTPErrorBarsPolygons
+                   || xErrorStyle==JKQTPErrorSimpleBars || xErrorStyle==JKQTPErrorSimpleBarsLines|| xErrorStyle==JKQTPErrorSimpleBarsPolygons))
+            {
                     double x0=parentGraph->transformX(xv+xrelshift*deltax-xl); bool x0ok=JKQTPIsOKFloat(x0);
                     double x1=parentGraph->transformX(xv+xrelshift*deltax+xe); bool x1ok=JKQTPIsOKFloat(x1);
                     painter.save(); auto __finalpaint=JKQTPFinally([&painter]() {painter.restore();});
@@ -429,8 +431,10 @@ void JKQTPGraphErrorStyleMixin::intPlotXYErrorIndicators(JKQTPEnhancedPainter& p
                     }
             }
             // y-errorbars
-                if ((yErrorColumn>=0 || yErrorColumnLower>=0) && (yErrorStyle==JKQTPErrorBars || yErrorStyle==JKQTPErrorBarsLines || yErrorStyle==JKQTPErrorBarsPolygons
-                    || yErrorStyle==JKQTPErrorSimpleBars || yErrorStyle==JKQTPErrorSimpleBarsLines || yErrorStyle==JKQTPErrorSimpleBarsPolygons)) {
+            if ((yErrorColumn>=0 || yErrorColumnLower>=0)
+                && (yErrorStyle==JKQTPErrorBars || yErrorStyle==JKQTPErrorBarsLines || yErrorStyle==JKQTPErrorBarsPolygons
+                || yErrorStyle==JKQTPErrorSimpleBars || yErrorStyle==JKQTPErrorSimpleBarsLines || yErrorStyle==JKQTPErrorSimpleBarsPolygons))
+            {
                 double y0=parentGraph->transformY(yv+yrelshift*deltay-yl); bool y0ok=JKQTPIsOKFloat(y0);
                 double y1=parentGraph->transformY(yv+yrelshift*deltay+ye); bool y1ok=JKQTPIsOKFloat(y1);
                 painter.save(); auto __finalpaint=JKQTPFinally([&painter]() {painter.restore();});
@@ -465,6 +469,66 @@ void JKQTPGraphErrorStyleMixin::intPlotXYErrorIndicators(JKQTPEnhancedPainter& p
                 }
             }
 
+            // half errorbars
+            if ((xErrorColumn>=0) && (xErrorStyle==JKQTPErrorHalfBarsAbove|| xErrorStyle==JKQTPErrorHalfBarsInwards|| xErrorStyle==JKQTPErrorHalfBarsBelow|| xErrorStyle==JKQTPErrorHalfBarsOutwards))
+            {
+                    double x0=parentGraph->transformX(xv+xrelshift*deltax-xl); bool x0ok=JKQTPIsOKFloat(x0);
+                    double x1=parentGraph->transformX(xv+xrelshift*deltax+xe); bool x1ok=JKQTPIsOKFloat(x1);
+                    painter.save(); auto __finalpaint=JKQTPFinally([&painter]() {painter.restore();});
+                    QPen pp=p;
+                    if (!defaultErrorColor) pp.setColor(terrCol);
+                    painter.setPen(pp);
+                    QList<QLineF> elines;
+                    if (    (xErrorStyle==JKQTPErrorHalfBarsAbove
+                         || (xErrorStyle==JKQTPErrorHalfBarsOutwards && xv>0.0)
+                         || (xErrorStyle==JKQTPErrorHalfBarsInwards && xv<0.0))
+                        &&x1ok&&xok&&yok) {
+                        elines<<QLineF(x, y, x1, y);
+                        elines<<QLineF(x1,y-ebs_px/2.0,x1,y+ebs_px/2.0);
+                    } else if ((xErrorStyle==JKQTPErrorHalfBarsBelow
+                         || (xErrorStyle==JKQTPErrorHalfBarsOutwards && xv<=0.0)
+                         || (xErrorStyle==JKQTPErrorHalfBarsInwards && xv>=0.0))
+                        &&x0ok&&xok&&yok) {
+                        elines<<QLineF(x0, y, x, y);
+                        elines<<QLineF(x0,y-ebs_px/2.0,x0,y+ebs_px/2.0);
+                    }
+                    for (QLineF& l: elines) {
+                        l=JKQTPClipLine(l, cliprect);
+                        if (l.length()>0) painter.drawLine(l);
+                    }
+            }
+
+
+            // half errorbars
+            if ((yErrorColumn>=0) && (yErrorStyle==JKQTPErrorHalfBarsAbove|| yErrorStyle==JKQTPErrorHalfBarsInwards|| yErrorStyle==JKQTPErrorHalfBarsBelow|| yErrorStyle==JKQTPErrorHalfBarsOutwards))
+            {
+                    double y0=parentGraph->transformY(yv+yrelshift*deltay-yl); bool y0ok=JKQTPIsOKFloat(y0);
+                    double y1=parentGraph->transformY(yv+yrelshift*deltay+ye); bool y1ok=JKQTPIsOKFloat(y1);
+                    painter.save(); auto __finalpaint=JKQTPFinally([&painter]() {painter.restore();});
+                    QPen pp=p;
+                    if (!defaultErrorColor) pp.setColor(terrCol);
+                    painter.setPen(pp);
+                    QList<QLineF> elines;
+                    if (    (yErrorStyle==JKQTPErrorHalfBarsAbove
+                         || (yErrorStyle==JKQTPErrorHalfBarsOutwards && yv>0.0)
+                         || (yErrorStyle==JKQTPErrorHalfBarsInwards && yv<0.0))
+                        &&yok&&y1ok&&xok) {
+                        elines<<QLineF(x, y, x, y1);
+                        elines<<QLineF(x-ebs_px/2.0,y1,x+ebs_px/2.0,y1);
+                    } else if ((yErrorStyle==JKQTPErrorHalfBarsBelow
+                         || (yErrorStyle==JKQTPErrorHalfBarsOutwards && yv<=0.0)
+                         || (yErrorStyle==JKQTPErrorHalfBarsInwards && yv>=0.0))
+                        &&y0ok&&yok&&xok) {
+                        elines<<QLineF(x, y0, x, y);
+                        elines<<QLineF(x-ebs_px/2.0,y0,x+ebs_px/2.0,y0);
+                    }
+                    for (QLineF& l: elines) {
+                        l=JKQTPClipLine(l, cliprect);
+                        if (l.length()>0) painter.drawLine(l);
+                    }
+            }
+
+
             // error boxes
             if (yErrorStyle==JKQTPErrorBoxes || xErrorStyle==JKQTPErrorBoxes || yErrorStyle==JKQTPErrorEllipses || xErrorStyle==JKQTPErrorEllipses ) {
                 double y0=parentGraph->transformY(yv+yrelshift*deltay-yl); bool y0ok=JKQTPIsOKFloat(y0);
@@ -486,8 +550,7 @@ void JKQTPGraphErrorStyleMixin::intPlotXYErrorIndicators(JKQTPEnhancedPainter& p
                 }
 
 
-                }            //}
-
+            }
             // x-errorlines
             if (pastFirst && (xErrorStyle==JKQTPErrorLines || xErrorStyle==JKQTPErrorBarsLines || xErrorStyle==JKQTPErrorSimpleBarsLines)) {
                 double xl1m=xmold;

lib/jkqtplotter/jkqtptools.cpp

@@ -197,6 +197,10 @@ QString JKQTPErrorPlotstyle2String(JKQTPErrorPlotstyle pos) {
         case JKQTPErrorEllipses: return "error_ell";
         case JKQTPErrorLines: return "error_lines";
         case JKQTPErrorBars: return "error_bars";
+        case JKQTPErrorHalfBarsAbove: return "error_bars_half_above";
+        case JKQTPErrorHalfBarsBelow: return "error_bars_half_below";
+        case JKQTPErrorHalfBarsInwards: return "error_bars_half_inwards";
+        case JKQTPErrorHalfBarsOutwards: return "error_bars_half_outwards";
         case JKQTPErrorSimpleBars: return "error_simplebars";
         case JKQTPErrorPolygons: return "error_polygons";
         case JKQTPErrorBarsLines: return "error_bars_lines";
@@ -220,6 +224,10 @@ JKQTPErrorPlotstyle String2JKQTPErrorPlotstyle(const QString& pos) {
     if (s=="error_bars_polygons") return JKQTPErrorBarsPolygons;
     if (s=="error_simplebars_lines") return JKQTPErrorSimpleBarsLines;
     if (s=="error_simplebars_polygons") return JKQTPErrorSimpleBarsPolygons;
+    if (s=="error_bars_half_above") return JKQTPErrorHalfBarsAbove;
+    if (s=="error_bars_half_below") return JKQTPErrorHalfBarsBelow;
+    if (s=="error_bars_half_inwards") return JKQTPErrorHalfBarsInwards;
+    if (s=="error_bars_half_outwards") return JKQTPErrorHalfBarsOutwards;
     return JKQTPNoError;
 }
 

lib/jkqtplotter/jkqtptools.h

@@ -582,6 +582,10 @@ enum JKQTPErrorPlotstyle {
     JKQTPErrorSimpleBars=6,          /*!< \brief simplified error bars for each data point \image html JKQTPErrorSimpleBars.png */
     JKQTPErrorLines=5,               /*!< \brief a second and third graph line above and below the actual data which indicates the error value \image html JKQTPErrorLines.png */
     JKQTPErrorBars=4,                /*!< \brief error bars for each data point \image html JKQTPErrorBars.png */
+    JKQTPErrorHalfBarsOutwards=11,   /*!< \brief half error bars for each data point, pointing outwards \image html JKQTPErrorHalfBarsOutwards.png */
+    JKQTPErrorHalfBarsInwards=12,    /*!< \brief half error bars for each data point, pointing inwards \image html JKQTPErrorHalfBarsInwards.png */
+    JKQTPErrorHalfBarsAbove=13,      /*!< \brief half error bars for each data point, pointing up \image html JKQTPErrorHalfBarsAbove.png */
+    JKQTPErrorHalfBarsBelow=14,      /*!< \brief half error bars for each data point, pointing down \image html JKQTPErrorHalfBarsBelow.png */
     JKQTPErrorPolygons=3,            /*!< \brief line error lines, but with filled range in between \image html JKQTPErrorPolygons.png */
     JKQTPErrorBarsLines=2,           /*!< \brief error bars and lines for each data point \image html JKQTPErrorBarsLines.png */
     JKQTPErrorBarsPolygons=1,        /*!< \brief error bars and polygons for each data point \image html JKQTPErrorBarsPolygons.png */