diff --git a/doc/dox/whatsnew.dox b/doc/dox/whatsnew.dox
index 9a38683366..346e82ec44 100644
--- a/doc/dox/whatsnew.dox
+++ b/doc/dox/whatsnew.dox
@@ -24,6 +24,7 @@ Changes, compared to  \ref page_whatsnew_V4_0_0 "v4.0.0" include:
     <li>FIXED issue <a href="https://github.com/jkriege2/JKQtPlotter/pull/70">#70: Typo in jkqtplotter/CMakeLists.txt</a>, thanks to <a href="https://github.com/tedlinlab">user:tedlinlab</a></li>
     <li>FIXED issue <a href="https://github.com/jkriege2/JKQtPlotter/pull/80">#80: Bug with multiple inheritance with Q_GDAGET with CLANG</a>, thanks to <a href="https://github.com/igormironchik">user:igormironchik</a>, caused by <a href="https://bugreports.qt.io/browse/QTBUG-104874">QTBUG-104874</a></li>
     <li>FIXED: styling was not properly applied to coordinate axes of colorbars outside the plot</li>
+    <li>REORGANIZED: separated line-graphs from jkqtpscatter.h/.cpp into jkqtplines.h/.cpp</li>
     <li>IMPROVED: QT6-compatibility by removing deprecated warnings</li>
     <li>NEW: JKQTPFilledCurveXGraph and JKQTPFilledCurveYGraph can now plot wiggle plots with different fill styles above and below the baseline (feature request <a href="https://github.com/jkriege2/JKQtPlotter/issues/68">#68 Wiggle Plots</a> from <a href="https://github.com/xichaoqiang">user:xichaoqiang</a>   </li>
     <li>NEW/BREAKING CHANGE: data tooltip can now also be shown when "just" moving the mouse (so far this was only possible when dragging the mouse with a button pressed). This also removes JKQtPlotter::getActMouseLeftAsToolTip() and adds JKQtPlotter::getActMouseMoveToolTip() instead! Also the default toolbars and context menus changed!</li>
diff --git a/lib/jkqtplotter.pri b/lib/jkqtplotter.pri
index 5a0f5181b1..18d5bf951c 100644
--- a/lib/jkqtplotter.pri
+++ b/lib/jkqtplotter.pri
@@ -55,6 +55,7 @@ isEmpty(JKQTP_PLOTTER_PRI_INCLUDED) {
                $$PWD/jkqtplotter/graphs/jkqtpbarchartbase.h \
                $$PWD/jkqtplotter/graphs/jkqtpbarchart.h \
                $$PWD/jkqtplotter/graphs/jkqtpevaluatedparametriccurve.h \
+               $$PWD/jkqtplotter/graphs/jkqtplines.h \
                $$PWD/jkqtplotter/gui/jkqtpcomboboxes.h \
                $$PWD/jkqtplotter/gui/jkqtpenhancedspinboxes.h \
                $$PWD/jkqtplotter/gui/jkqtpenhancedtableview.h \
@@ -107,6 +108,7 @@ isEmpty(JKQTP_PLOTTER_PRI_INCLUDED) {
                $$PWD/jkqtplotter/graphs/jkqtpbarchartbase.cpp  \
                $$PWD/jkqtplotter/graphs/jkqtpbarchart.cpp  \
                $$PWD/jkqtplotter/graphs/jkqtpevaluatedparametriccurve.cpp  \
+               $$PWD/jkqtplotter/graphs/jkqtplines.cpp  \
                $$PWD/jkqtplotter/gui/jkqtpcomboboxes.cpp \
                $$PWD/jkqtplotter/gui/jkqtpenhancedspinboxes.cpp \
                $$PWD/jkqtplotter/gui/jkqtpenhancedtableview.cpp \
diff --git a/lib/jkqtplotter/CMakeLists.txt b/lib/jkqtplotter/CMakeLists.txt
index 93390c1ad9..230dfffd24 100644
--- a/lib/jkqtplotter/CMakeLists.txt
+++ b/lib/jkqtplotter/CMakeLists.txt
@@ -66,6 +66,7 @@ set(SOURCES_GRAPHS
     ${CMAKE_CURRENT_LIST_DIR}/graphs/jkqtpviolinplotstylingmixins.cpp
     ${CMAKE_CURRENT_LIST_DIR}/graphs/jkqtpstatisticsadaptors.cpp 
     ${CMAKE_CURRENT_LIST_DIR}/graphs/jkqtpevaluatedparametriccurve.cpp 
+    ${CMAKE_CURRENT_LIST_DIR}/graphs/jkqtplines.cpp 
     )
 set(SOURCES_GUI
     ${CMAKE_CURRENT_LIST_DIR}/gui/jkqtpcomboboxes.cpp
@@ -169,6 +170,8 @@ set(HEADERS_GRAPHS
     $<INSTALL_INTERFACE:graphs/jkqtpbarchart.h>
     $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/graphs/jkqtpevaluatedparametriccurve.h>
     $<INSTALL_INTERFACE:graphs/jkqtpevaluatedparametriccurve.h>
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/graphs/jkqtplines.h>
+    $<INSTALL_INTERFACE:graphs/jkqtplines.h>
 )
 set(HEADERS_GUI
     $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/gui/jkqtpcomboboxes.h>
diff --git a/lib/jkqtplotter/graphs/jkqtplines.cpp b/lib/jkqtplotter/graphs/jkqtplines.cpp
new file mode 100644
index 0000000000..07ee5af09b
--- /dev/null
+++ b/lib/jkqtplotter/graphs/jkqtplines.cpp
@@ -0,0 +1,307 @@
+/*
+    Copyright (c) 2008-2022 Jan W. Krieger (<jan@jkrieger.de>)
+
+
+
+    This software is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License (LGPL) as published by
+    the Free Software Foundation, either version 2.1 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License (LGPL) for more details.
+
+    You should have received a copy of the GNU Lesser General Public License (LGPL)
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+
+
+#include "jkqtplotter/graphs/jkqtplines.h"
+#include "jkqtplotter/jkqtpbaseplotter.h"
+#include <stdlib.h>
+#include <QDebug>
+#include <QMarginsF>
+#include <iostream>
+#include "jkqtcommon/jkqtpdrawingtools.h"
+#include "jkqtplotter/jkqtptools.h"
+#include "jkqtplotter/jkqtpimagetools.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;
+
+
+
+
+
+
+
+
+
+
+
+JKQTPXYLineGraph::JKQTPXYLineGraph(JKQTPlotter* parent):
+    JKQTPXYLineGraph(parent->getPlotter())
+{
+}
+
+JKQTPXYLineGraph::JKQTPXYLineGraph(JKQTBasePlotter* parent):
+    JKQTPXYGraph(parent),
+    drawLine(true)
+{
+    sortData=JKQTPXYGraph::Unsorted;
+
+    initLineStyle(parent, parentPlotStyle, JKQTPPlotStyleType::Default);
+    initSymbolStyle(parent, parentPlotStyle, JKQTPPlotStyleType::Default);
+}
+
+void JKQTPXYLineGraph::draw(JKQTPEnhancedPainter& painter) {
+#ifdef JKQTBP_AUTOTIMER
+    JKQTPAutoOutputTimer jkaaot("JKQTPXYLineGraph::draw");
+#endif
+    if (parent==nullptr) return;
+    const JKQTPDatastore* datastore=parent->getDatastore();
+    if (datastore==nullptr) return;
+
+    //qDebug()<<"JKQTPXYLineGraph::draw();";
+
+    drawErrorsBefore(painter);
+    {
+        //qDebug()<<"JKQTPXYLineGraph::draw(): "<<1;
+        painter.save(); auto __finalpaint=JKQTPFinally([&painter]() {painter.restore();});
+        //qDebug()<<"JKQTPXYLineGraph::draw(): "<<2;
+
+        const QPen p=getLinePen(painter, parent);
+        const QPen penSelection=getHighlightingLinePen(painter, parent);
+        const auto symType=getSymbolType();
+        const double xmin=transformX(parent->getXAxis()->getMin());
+        const double xmax=transformX(parent->getXAxis()->getMax());
+        const double ymin=transformY(parent->getYAxis()->getMin());
+        const double ymax=transformY(parent->getYAxis()->getMax());
+        const double symbolSize=parent->pt2px(painter, getSymbolSize());
+        const QMarginsF clipMargins=(symType==JKQTPNoSymbol)?QMarginsF(0,0,0,0):QMarginsF(symbolSize,symbolSize,symbolSize,symbolSize);
+        const QRectF cliprect=QRectF(qMin(xmin,xmax),qMin(ymin,ymax),fabs(xmax-xmin),fabs(ymax-ymin))+clipMargins;
+
+
+        int imax=0;
+        int imin=0;
+        if (getIndexRange(imin, imax)) {
+
+
+            QList<QPolygonF> vec_linesP;
+            vec_linesP.push_back(QPolygonF());
+            intSortData();
+            for (int iii=imin; iii<imax; iii++) {
+                const int i=qBound(imin, getDataIndex(iii), imax);
+                const double xv=datastore->get(static_cast<size_t>(xColumn),static_cast<size_t>(i));
+                const double yv=datastore->get(static_cast<size_t>(yColumn),static_cast<size_t>(i));
+                const double x=transformX(xv);
+                const double y=transformY(yv);
+                //qDebug()<<"JKQTPXYLineGraph::draw(): (xv, yv) =    ( "<<xv<<", "<<yv<<" )";
+                if (JKQTPIsOKFloat(xv) && JKQTPIsOKFloat(yv)  &&  JKQTPIsOKFloat(x) && JKQTPIsOKFloat(y)) {
+
+                    //if (isHighlighted() && getSymbolType()!=JKQTPNoSymbol) {
+                        //JKQTPPlotSymbol(painter, x, y, JKQTPFilledCircle, parent->pt2px(painter, symbolSize*1.5), parent->pt2px(painter, symbolWidth*parent->getLineWidthMultiplier()), penSelection.color(), penSelection.color());
+                    //}
+                    if ((!parent->getXAxis()->isLogAxis() || xv>0.0) && (!parent->getYAxis()->isLogAxis() || yv>0.0) ) {
+                        if (symType!=JKQTPNoSymbol && cliprect.contains(x,y)) plotStyledSymbol(parent, painter, x, y);
+                        if (drawLine) {
+                            vec_linesP.last() << QPointF(x,y);
+                        }
+                    } else {
+                        if (drawLine) {
+                            if (vec_linesP.size()==0 || vec_linesP.last().size()>0)
+                            vec_linesP.push_back(QPolygonF());
+                        }
+                    }
+                }
+            }
+            //qDebug()<<"JKQTPXYLineGraph::draw(): "<<4<<" lines="<<lines.size();
+            //qDebug()<<"JKQTPXYLineGraph::draw(): "<<5<<"  p="<<painter.pen();
+            if (drawLine) {
+                //qDebug()<<"JKQTPXYLineGraph::draw(): vec_linesP.size()=="<<vec_linesP.size();
+
+                QList<QPolygonF> linesToDraw;
+                if (getUseNonvisibleLineCompression()) linesToDraw=JKQTPClipPolyLines(JKQTPSimplifyPolyLines(vec_linesP, p.widthF()*getNonvisibleLineCompressionAgressiveness()), cliprect);
+                else linesToDraw=JKQTPClipPolyLines(vec_linesP, cliprect);
+                //qDebug()<<"JKQTPXYLineGraph::draw(): linesToDraw.size()=="<<linesToDraw.size()<<", clip: x="<<xmin<<".."<<xmax<<", y="<<ymin<<".."<<ymax;
+                for (const auto &linesP : linesToDraw) {
+                    //qDebug()<<"JKQTPXYLineGraph::draw():   linesPFromV.size()=="<<linesPFromV.size()<<"   useNonvisibleLineCompression="<<getUseNonvisibleLineCompression();
+                    //qDebug()<<"JKQTPXYLineGraph::draw():     --> linesP.size()=="<<linesP.size();
+                    if (linesP.size()>0) {
+                        if (isHighlighted()) {
+                            painter.setPen(penSelection);
+                            painter.drawPolyline(linesP);
+                        }
+                        painter.setPen(p);
+                        painter.drawPolyline(linesP);
+                    }
+                }
+            }
+            //qDebug()<<"JKQTPXYLineGraph::draw(): "<<6;
+        }
+    }
+    //qDebug()<<"JKQTPXYLineGraph::draw(): "<<7;
+    drawErrorsAfter(painter);
+    //qDebug()<<"JKQTPXYLineGraph::draw() ... done";
+}
+
+void JKQTPXYLineGraph::drawKeyMarker(JKQTPEnhancedPainter& painter, QRectF& rect) {
+    const double minSize=qMin(rect.width(), rect.height());
+    const double maxSize=qMax(rect.width(), rect.height());
+    double symbolSize=parent->pt2px(painter, this->getSymbolSize());
+    if (symbolSize>minSize*0.9) symbolSize=minSize*0.9;
+    double symbolWidth=parent->pt2px(painter, this->getSymbolLineWidth()*parent->getLineWidthMultiplier());
+    if (symbolWidth>0.3*symbolSize) symbolWidth=0.3*symbolSize;
+    double lineWidth=parent->pt2px(painter, this->getLineWidth()*parent->getLineWidthMultiplier());
+    if (lineWidth>0.5*maxSize) lineWidth=0.5*maxSize;
+
+    painter.save(); auto __finalpaint=JKQTPFinally([&painter]() {painter.restore();});
+    QPen p=getLinePen(painter, parent);
+    p.setColor(getKeyLabelColor());
+    p.setStyle(getLineStyle());
+    p.setWidthF(lineWidth);
+    painter.setPen(p);
+    double y=rect.top()+rect.height()/2.0;
+    if (drawLine) painter.drawLine(QLineF(rect.left(), y, rect.right(), y));
+    JKQTPPlotSymbol(painter, rect.left()+rect.width()/2.0, rect.top()+rect.height()/2.0, getSymbolType(), symbolSize, symbolWidth, getKeyLabelColor(), getSymbolFillColor());
+
+}
+
+QColor JKQTPXYLineGraph::getKeyLabelColor() const {
+    return getSymbolColor();
+}
+
+void JKQTPXYLineGraph::setDrawLine(bool __value)
+{
+    this->drawLine = __value;
+}
+
+bool JKQTPXYLineGraph::getDrawLine() const
+{
+    return this->drawLine;
+}
+
+void JKQTPXYLineGraph::setColor(QColor c)
+{
+    setLineColor(c);
+    setSymbolColor(c);
+    setSymbolFillColor(JKQTPGetDerivedColor(parent->getCurrentPlotterStyle().graphsStyle.defaultGraphStyle.fillColorDerivationMode, c));
+    c.setAlphaF(0.5);
+    setHighlightingLineColor(c);
+}
+
+
+
+JKQTPXYLineErrorGraph::JKQTPXYLineErrorGraph(JKQTBasePlotter *parent):
+    JKQTPXYLineGraph(parent)
+{
+    setErrorColorFromGraphColor(getSymbolColor());
+    initErrorStyle(parent, parentPlotStyle);
+}
+
+JKQTPXYLineErrorGraph::JKQTPXYLineErrorGraph(JKQTPlotter *parent):
+    JKQTPXYLineErrorGraph(parent->getPlotter())
+{
+
+}
+
+bool JKQTPXYLineErrorGraph::getXMinMax(double &minx, double &maxx, double &smallestGreaterZero) {
+    if (xErrorColumn<0 || xErrorStyle==JKQTPNoError) {
+        return JKQTPXYLineGraph::getXMinMax(minx, maxx, smallestGreaterZero);
+    } else {
+        bool start=true;
+        minx=0;
+        maxx=0;
+        smallestGreaterZero=0;
+
+        if (parent==nullptr) return false;
+
+        const JKQTPDatastore* datastore=parent->getDatastore();
+        int imax=0;
+        int imin=0;
+        if (getIndexRange(imin, imax)) {
+            for (int i=imin; i<imax; i++) {
+                double xv=datastore->get(static_cast<size_t>(xColumn),static_cast<size_t>(i))+getXErrorU(i, datastore);
+                if (JKQTPIsOKFloat(xv)) {
+                    if (start || xv>maxx) maxx=xv;
+                    if (start || xv<minx) minx=xv;
+                    const double xvsgz=xv; SmallestGreaterZeroCompare_xvsgz();
+                    start=false;
+                }
+                xv=datastore->get(static_cast<size_t>(xColumn),static_cast<size_t>(i))-getXErrorL(i, datastore);
+                if (JKQTPIsOKFloat(xv)) {
+                    if (start || xv>maxx) maxx=xv;
+                    if (start || xv<minx) minx=xv;
+                    const double xvsgz=xv; SmallestGreaterZeroCompare_xvsgz();
+                    start=false;
+                }
+            }
+            return !start;
+        }
+    }
+    return false;
+}
+
+bool JKQTPXYLineErrorGraph::getYMinMax(double &miny, double &maxy, double &smallestGreaterZero) {
+    if (yErrorColumn<0 || yErrorStyle==JKQTPNoError) {
+        return JKQTPXYLineGraph::getYMinMax(miny, maxy, smallestGreaterZero);
+    } else {
+        bool start=true;
+        miny=0;
+        maxy=0;
+        smallestGreaterZero=0;
+
+        if (parent==nullptr) return false;
+
+        const JKQTPDatastore* datastore=parent->getDatastore();
+        int imax=0;
+        int imin=0;
+        if (getIndexRange(imin, imax)) {
+            for (int i=imin; i<imax; i++) {
+                double yv=datastore->get(static_cast<size_t>(yColumn),static_cast<size_t>(i))+getYErrorU(i, datastore);
+                if (JKQTPIsOKFloat(yv)) {
+                    if (start || yv>maxy) maxy=yv;
+                    if (start || yv<miny) miny=yv;
+                    const double xvsgz=yv; SmallestGreaterZeroCompare_xvsgz();
+                    start=false;
+                }
+                yv=datastore->get(static_cast<size_t>(yColumn),static_cast<size_t>(i))-getYErrorL(i, datastore);
+                if (JKQTPIsOKFloat(yv)) {
+                    if (start || yv>maxy) maxy=yv;
+                    if (start || yv<miny) miny=yv;
+                    const double xvsgz=yv; SmallestGreaterZeroCompare_xvsgz();
+                    start=false;
+                }
+            }
+            return !start;
+        }
+    }
+    return false;
+}
+
+bool JKQTPXYLineErrorGraph::usesColumn(int c) const
+{
+    return JKQTPXYLineGraph::usesColumn(c)||JKQTPXYGraphErrors::errorUsesColumn(c);
+}
+
+void JKQTPXYLineErrorGraph::drawErrorsBefore(JKQTPEnhancedPainter &painter)
+{
+    intSortData();
+    if (sortData==JKQTPXYGraph::Unsorted) plotErrorIndicators(painter, parent, this, xColumn, yColumn);
+    else plotErrorIndicators(painter, parent, this, xColumn, yColumn, 0, 0, &sortedIndices);
+
+}
+
+
+
+
+
+
+
+
+
+
diff --git a/lib/jkqtplotter/graphs/jkqtplines.h b/lib/jkqtplotter/graphs/jkqtplines.h
new file mode 100644
index 0000000000..d5bafbfc17
--- /dev/null
+++ b/lib/jkqtplotter/graphs/jkqtplines.h
@@ -0,0 +1,139 @@
+/*
+    Copyright (c) 2008-2022 Jan W. Krieger (<jan@jkrieger.de>)
+
+    
+
+    This software is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License (LGPL) as published by
+    the Free Software Foundation, either version 2.1 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License (LGPL) for more details.
+
+    You should have received a copy of the GNU Lesser General Public License (LGPL)
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef JKQTPLINES_H
+#define JKQTPLINES_H
+
+
+#include <QString>
+#include <QPainter>
+#include <QPair>
+#include <functional>
+#include "jkqtplotter/jkqtptools.h"
+#include "jkqtplotter/jkqtplotter_imexport.h"
+#include "jkqtcommon/jkqtpdrawingtools.h"
+#include "jkqtplotter/jkqtpgraphsbase.h"
+#include "jkqtcommon/jkqtpenhancedpainter.h"
+#include "jkqtplotter/jkqtpgraphsbaseerrors.h"
+#include "jkqtplotter/graphs/jkqtprange.h"
+#include "jkqtplotter/jkqtpgraphsbasestylingmixins.h"
+
+// forward declarations
+class JKQTBasePlotter;
+class JKQTPlotter;
+class JKQTPCoordinateAxis;
+class JKQTPDatastore;
+//class JKQTPColorPaletteStyleAndToolsMixin;
+
+
+
+
+
+
+/*! \brief This implements xy line plots. This also alows to draw symbols at the data points.
+    \ingroup jkqtplotter_linesymbolgraphs_simple
+
+    \image html plot_lineplots.png
+
+    \note This classes can (and does by default) apply a line-compression strategy that improves plotting speed
+          but reduces accuracy a bit. See JKQTPGraphLinesCompressionMixin for details.
+
+    \see \ref JKQTPlotterAdvancedLineAndFillStyling, \ref JKQTPlotterSimpleTest, \ref JKQTPlotterSymbolsAndStyles,
+         jkqtpstatAddVKDE1D(), jkqtpstatAddVKDE1DAutoranged(), jkqtpstatAddHKDE1D(), jkqtpstatAddHKDE1DAutoranged(),
+         JKQTPGraphLinesCompressionMixin
+ */
+class JKQTPLOTTER_LIB_EXPORT JKQTPXYLineGraph: public JKQTPXYGraph, public JKQTPGraphLineStyleMixin, public JKQTPGraphSymbolStyleMixin, public JKQTPGraphLinesCompressionMixin {
+        Q_OBJECT
+    public:
+        /** \brief class constructor */
+        explicit JKQTPXYLineGraph(JKQTBasePlotter* parent=nullptr);
+        /** \brief class constructor */
+        JKQTPXYLineGraph(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;
+        /** \brief returns the color to be used for the key label */
+        virtual QColor getKeyLabelColor() const override;
+
+        /** \copydoc drawLine */
+        void setDrawLine(bool __value);
+        /** \copydoc drawLine */
+        bool getDrawLine() const;
+
+        /** \brief set color of line and symbol */
+        void setColor(QColor c);
+
+    protected:
+
+        /** \brief indicates whether to draw a line or not */
+        bool drawLine;
+
+
+
+
+};
+
+
+
+
+
+
+/*! \brief This implements xy line plots with x and y error indicators.
+    \ingroup jkqtplotter_linesymbolgraphs_simple
+
+    \image html plot_errorbarlineplots.png
+    \image html plot_errorlinelineplots.png
+    \image html plot_errorpolygonlineplots.png
+
+    \see jkqtpstatAddXYErrorLineGraph(), jkqtpstatAddXErrorLineGraph(), jkqtpstatAddYErrorLineGraph(), \ref JKQTPlotterErrorBarStyles, \ref JKQTPlotterBasicJKQTPDatastoreStatisticsGroupedStat
+ */
+class JKQTPLOTTER_LIB_EXPORT JKQTPXYLineErrorGraph: public JKQTPXYLineGraph, public JKQTPXYGraphErrors {
+        Q_OBJECT
+    public:
+        /** \brief class constructor */
+        JKQTPXYLineErrorGraph(JKQTBasePlotter* parent=nullptr);
+        /** \brief class constructor */
+        JKQTPXYLineErrorGraph(JKQTPlotter* parent);
+
+        /** \brief get the maximum and minimum x-value of the graph
+         *
+         * The result is given in the two parameters which are call-by-reference parameters!
+         */
+        virtual bool getXMinMax(double& minx, double& maxx, double& smallestGreaterZero) override;
+        /** \brief get the maximum and minimum y-value of the graph
+         *
+         * The result is given in the two parameters which are call-by-reference parameters!
+         */
+        virtual bool getYMinMax(double& miny, double& maxy, double& smallestGreaterZero) override;
+        /** \copydoc JKQTPGraph::usesColumn() */
+        virtual bool usesColumn(int c) const override;
+
+    protected:
+        /** \brief this function is used to plot error inidcators before plotting the graphs. */
+        virtual void drawErrorsBefore(JKQTPEnhancedPainter& painter)  override;
+};
+
+
+
+
+
+
+#endif // JKQTPLINES_H
diff --git a/lib/jkqtplotter/graphs/jkqtpscatter.cpp b/lib/jkqtplotter/graphs/jkqtpscatter.cpp
index d5733aacf5..992f079d03 100644
--- a/lib/jkqtplotter/graphs/jkqtpscatter.cpp
+++ b/lib/jkqtplotter/graphs/jkqtpscatter.cpp
@@ -43,267 +43,6 @@
 
 
 
-JKQTPXYLineGraph::JKQTPXYLineGraph(JKQTPlotter* parent):
-    JKQTPXYLineGraph(parent->getPlotter())
-{
-}
-
-JKQTPXYLineGraph::JKQTPXYLineGraph(JKQTBasePlotter* parent):
-    JKQTPXYGraph(parent),
-    drawLine(true)
-{
-    sortData=JKQTPXYGraph::Unsorted;
-
-    initLineStyle(parent, parentPlotStyle, JKQTPPlotStyleType::Default);
-    initSymbolStyle(parent, parentPlotStyle, JKQTPPlotStyleType::Default);
-}
-
-void JKQTPXYLineGraph::draw(JKQTPEnhancedPainter& painter) {
-#ifdef JKQTBP_AUTOTIMER
-    JKQTPAutoOutputTimer jkaaot("JKQTPXYLineGraph::draw");
-#endif
-    if (parent==nullptr) return;
-    const JKQTPDatastore* datastore=parent->getDatastore();
-    if (datastore==nullptr) return;
-
-    //qDebug()<<"JKQTPXYLineGraph::draw();";
-
-    drawErrorsBefore(painter);
-    {
-        //qDebug()<<"JKQTPXYLineGraph::draw(): "<<1;
-        painter.save(); auto __finalpaint=JKQTPFinally([&painter]() {painter.restore();});
-        //qDebug()<<"JKQTPXYLineGraph::draw(): "<<2;
-
-        const QPen p=getLinePen(painter, parent);
-        const QPen penSelection=getHighlightingLinePen(painter, parent);
-        const auto symType=getSymbolType();
-        const double xmin=transformX(parent->getXAxis()->getMin());
-        const double xmax=transformX(parent->getXAxis()->getMax());
-        const double ymin=transformY(parent->getYAxis()->getMin());
-        const double ymax=transformY(parent->getYAxis()->getMax());
-        const double symbolSize=parent->pt2px(painter, getSymbolSize());
-        const QMarginsF clipMargins=(symType==JKQTPNoSymbol)?QMarginsF(0,0,0,0):QMarginsF(symbolSize,symbolSize,symbolSize,symbolSize);
-        const QRectF cliprect=QRectF(qMin(xmin,xmax),qMin(ymin,ymax),fabs(xmax-xmin),fabs(ymax-ymin))+clipMargins;
-
-
-        int imax=0;
-        int imin=0;
-        if (getIndexRange(imin, imax)) {
-
-
-            QList<QPolygonF> vec_linesP;
-            vec_linesP.push_back(QPolygonF());
-            intSortData();
-            for (int iii=imin; iii<imax; iii++) {
-                const int i=qBound(imin, getDataIndex(iii), imax);
-                const double xv=datastore->get(static_cast<size_t>(xColumn),static_cast<size_t>(i));
-                const double yv=datastore->get(static_cast<size_t>(yColumn),static_cast<size_t>(i));
-                const double x=transformX(xv);
-                const double y=transformY(yv);
-                //qDebug()<<"JKQTPXYLineGraph::draw(): (xv, yv) =    ( "<<xv<<", "<<yv<<" )";
-                if (JKQTPIsOKFloat(xv) && JKQTPIsOKFloat(yv)  &&  JKQTPIsOKFloat(x) && JKQTPIsOKFloat(y)) {
-
-                    //if (isHighlighted() && getSymbolType()!=JKQTPNoSymbol) {
-                        //JKQTPPlotSymbol(painter, x, y, JKQTPFilledCircle, parent->pt2px(painter, symbolSize*1.5), parent->pt2px(painter, symbolWidth*parent->getLineWidthMultiplier()), penSelection.color(), penSelection.color());
-                    //}
-                    if ((!parent->getXAxis()->isLogAxis() || xv>0.0) && (!parent->getYAxis()->isLogAxis() || yv>0.0) ) {
-                        if (symType!=JKQTPNoSymbol && cliprect.contains(x,y)) plotStyledSymbol(parent, painter, x, y);
-                        if (drawLine) {
-                            vec_linesP.last() << QPointF(x,y);
-                        }
-                    } else {
-                        if (drawLine) {
-                            if (vec_linesP.size()==0 || vec_linesP.last().size()>0)
-                            vec_linesP.push_back(QPolygonF());
-                        }
-                    }
-                }
-            }
-            //qDebug()<<"JKQTPXYLineGraph::draw(): "<<4<<" lines="<<lines.size();
-            //qDebug()<<"JKQTPXYLineGraph::draw(): "<<5<<"  p="<<painter.pen();
-            if (drawLine) {
-                //qDebug()<<"JKQTPXYLineGraph::draw(): vec_linesP.size()=="<<vec_linesP.size();
-
-                QList<QPolygonF> linesToDraw;
-                if (getUseNonvisibleLineCompression()) linesToDraw=JKQTPClipPolyLines(JKQTPSimplifyPolyLines(vec_linesP, p.widthF()*getNonvisibleLineCompressionAgressiveness()), cliprect);
-                else linesToDraw=JKQTPClipPolyLines(vec_linesP, cliprect);
-                //qDebug()<<"JKQTPXYLineGraph::draw(): linesToDraw.size()=="<<linesToDraw.size()<<", clip: x="<<xmin<<".."<<xmax<<", y="<<ymin<<".."<<ymax;
-                for (const auto &linesP : linesToDraw) {
-                    //qDebug()<<"JKQTPXYLineGraph::draw():   linesPFromV.size()=="<<linesPFromV.size()<<"   useNonvisibleLineCompression="<<getUseNonvisibleLineCompression();
-                    //qDebug()<<"JKQTPXYLineGraph::draw():     --> linesP.size()=="<<linesP.size();
-                    if (linesP.size()>0) {
-                        if (isHighlighted()) {
-                            painter.setPen(penSelection);
-                            painter.drawPolyline(linesP);
-                        }
-                        painter.setPen(p);
-                        painter.drawPolyline(linesP);
-                    }
-                }
-            }
-            //qDebug()<<"JKQTPXYLineGraph::draw(): "<<6;
-        }
-    }
-    //qDebug()<<"JKQTPXYLineGraph::draw(): "<<7;
-    drawErrorsAfter(painter);
-    //qDebug()<<"JKQTPXYLineGraph::draw() ... done";
-}
-
-void JKQTPXYLineGraph::drawKeyMarker(JKQTPEnhancedPainter& painter, QRectF& rect) {
-    const double minSize=qMin(rect.width(), rect.height());
-    const double maxSize=qMax(rect.width(), rect.height());
-    double symbolSize=parent->pt2px(painter, this->getSymbolSize());
-    if (symbolSize>minSize*0.9) symbolSize=minSize*0.9;
-    double symbolWidth=parent->pt2px(painter, this->getSymbolLineWidth()*parent->getLineWidthMultiplier());
-    if (symbolWidth>0.3*symbolSize) symbolWidth=0.3*symbolSize;
-    double lineWidth=parent->pt2px(painter, this->getLineWidth()*parent->getLineWidthMultiplier());
-    if (lineWidth>0.5*maxSize) lineWidth=0.5*maxSize;
-
-    painter.save(); auto __finalpaint=JKQTPFinally([&painter]() {painter.restore();});
-    QPen p=getLinePen(painter, parent);
-    p.setColor(getKeyLabelColor());
-    p.setStyle(getLineStyle());
-    p.setWidthF(lineWidth);
-    painter.setPen(p);
-    double y=rect.top()+rect.height()/2.0;
-    if (drawLine) painter.drawLine(QLineF(rect.left(), y, rect.right(), y));
-    JKQTPPlotSymbol(painter, rect.left()+rect.width()/2.0, rect.top()+rect.height()/2.0, getSymbolType(), symbolSize, symbolWidth, getKeyLabelColor(), getSymbolFillColor());
-
-}
-
-QColor JKQTPXYLineGraph::getKeyLabelColor() const {
-    return getSymbolColor();
-}
-
-void JKQTPXYLineGraph::setDrawLine(bool __value)
-{
-    this->drawLine = __value;
-}
-
-bool JKQTPXYLineGraph::getDrawLine() const
-{
-    return this->drawLine;
-}
-
-void JKQTPXYLineGraph::setColor(QColor c)
-{
-    setLineColor(c);
-    setSymbolColor(c);
-    setSymbolFillColor(JKQTPGetDerivedColor(parent->getCurrentPlotterStyle().graphsStyle.defaultGraphStyle.fillColorDerivationMode, c));
-    c.setAlphaF(0.5);
-    setHighlightingLineColor(c);
-}
-
-
-
-JKQTPXYLineErrorGraph::JKQTPXYLineErrorGraph(JKQTBasePlotter *parent):
-    JKQTPXYLineGraph(parent)
-{
-    setErrorColorFromGraphColor(getSymbolColor());
-    initErrorStyle(parent, parentPlotStyle);
-}
-
-JKQTPXYLineErrorGraph::JKQTPXYLineErrorGraph(JKQTPlotter *parent):
-    JKQTPXYLineErrorGraph(parent->getPlotter())
-{
-
-}
-
-bool JKQTPXYLineErrorGraph::getXMinMax(double &minx, double &maxx, double &smallestGreaterZero) {
-    if (xErrorColumn<0 || xErrorStyle==JKQTPNoError) {
-        return JKQTPXYLineGraph::getXMinMax(minx, maxx, smallestGreaterZero);
-    } else {
-        bool start=true;
-        minx=0;
-        maxx=0;
-        smallestGreaterZero=0;
-
-        if (parent==nullptr) return false;
-
-        const JKQTPDatastore* datastore=parent->getDatastore();
-        int imax=0;
-        int imin=0;
-        if (getIndexRange(imin, imax)) {
-            for (int i=imin; i<imax; i++) {
-                double xv=datastore->get(static_cast<size_t>(xColumn),static_cast<size_t>(i))+getXErrorU(i, datastore);
-                if (JKQTPIsOKFloat(xv)) {
-                    if (start || xv>maxx) maxx=xv;
-                    if (start || xv<minx) minx=xv;
-                    const double xvsgz=xv; SmallestGreaterZeroCompare_xvsgz();
-                    start=false;
-                }
-                xv=datastore->get(static_cast<size_t>(xColumn),static_cast<size_t>(i))-getXErrorL(i, datastore);
-                if (JKQTPIsOKFloat(xv)) {
-                    if (start || xv>maxx) maxx=xv;
-                    if (start || xv<minx) minx=xv;
-                    const double xvsgz=xv; SmallestGreaterZeroCompare_xvsgz();
-                    start=false;
-                }
-            }
-            return !start;
-        }
-    }
-    return false;
-}
-
-bool JKQTPXYLineErrorGraph::getYMinMax(double &miny, double &maxy, double &smallestGreaterZero) {
-    if (yErrorColumn<0 || yErrorStyle==JKQTPNoError) {
-        return JKQTPXYLineGraph::getYMinMax(miny, maxy, smallestGreaterZero);
-    } else {
-        bool start=true;
-        miny=0;
-        maxy=0;
-        smallestGreaterZero=0;
-
-        if (parent==nullptr) return false;
-
-        const JKQTPDatastore* datastore=parent->getDatastore();
-        int imax=0;
-        int imin=0;
-        if (getIndexRange(imin, imax)) {
-            for (int i=imin; i<imax; i++) {
-                double yv=datastore->get(static_cast<size_t>(yColumn),static_cast<size_t>(i))+getYErrorU(i, datastore);
-                if (JKQTPIsOKFloat(yv)) {
-                    if (start || yv>maxy) maxy=yv;
-                    if (start || yv<miny) miny=yv;
-                    const double xvsgz=yv; SmallestGreaterZeroCompare_xvsgz();
-                    start=false;
-                }
-                yv=datastore->get(static_cast<size_t>(yColumn),static_cast<size_t>(i))-getYErrorL(i, datastore);
-                if (JKQTPIsOKFloat(yv)) {
-                    if (start || yv>maxy) maxy=yv;
-                    if (start || yv<miny) miny=yv;
-                    const double xvsgz=yv; SmallestGreaterZeroCompare_xvsgz();
-                    start=false;
-                }
-            }
-            return !start;
-        }
-    }
-    return false;
-}
-
-bool JKQTPXYLineErrorGraph::usesColumn(int c) const
-{
-    return JKQTPXYLineGraph::usesColumn(c)||JKQTPXYGraphErrors::errorUsesColumn(c);
-}
-
-void JKQTPXYLineErrorGraph::drawErrorsBefore(JKQTPEnhancedPainter &painter)
-{
-    intSortData();
-    if (sortData==JKQTPXYGraph::Unsorted) plotErrorIndicators(painter, parent, this, xColumn, yColumn);
-    else plotErrorIndicators(painter, parent, this, xColumn, yColumn, 0, 0, &sortedIndices);
-
-}
-
-
-
-
-
-
-
-
-
 
 
 
diff --git a/lib/jkqtplotter/graphs/jkqtpscatter.h b/lib/jkqtplotter/graphs/jkqtpscatter.h
index 695aed95e9..5f3fd96b01 100644
--- a/lib/jkqtplotter/graphs/jkqtpscatter.h
+++ b/lib/jkqtplotter/graphs/jkqtpscatter.h
@@ -17,8 +17,8 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#ifndef jkqtpgraphs_H
-#define jkqtpgraphs_H
+#ifndef jkqtpscatter_H
+#define jkqtpscatter_H
 
 
 #include <QString>
@@ -32,6 +32,7 @@
 #include "jkqtcommon/jkqtpenhancedpainter.h"
 #include "jkqtplotter/jkqtpgraphsbaseerrors.h"
 #include "jkqtplotter/graphs/jkqtprange.h"
+#include "jkqtplotter/graphs/jkqtplines.h"
 #include "jkqtplotter/jkqtpgraphsbasestylingmixins.h"
 
 // forward declarations
@@ -46,59 +47,6 @@ class JKQTPDatastore;
 
 
 
-/*! \brief This implements xy line plots. This also alows to draw symbols at the data points.
-    \ingroup jkqtplotter_linesymbolgraphs_simple
-
-    \image html plot_lineplots.png
-
-    \note This classes can (and does by default) apply a line-compression strategy that improves plotting speed
-          but reduces accuracy a bit. See JKQTPGraphLinesCompressionMixin for details.
-
-    \see \ref JKQTPlotterAdvancedLineAndFillStyling, \ref JKQTPlotterSimpleTest, \ref JKQTPlotterSymbolsAndStyles,
-         jkqtpstatAddVKDE1D(), jkqtpstatAddVKDE1DAutoranged(), jkqtpstatAddHKDE1D(), jkqtpstatAddHKDE1DAutoranged(),
-         JKQTPGraphLinesCompressionMixin
- */
-class JKQTPLOTTER_LIB_EXPORT JKQTPXYLineGraph: public JKQTPXYGraph, public JKQTPGraphLineStyleMixin, public JKQTPGraphSymbolStyleMixin, public JKQTPGraphLinesCompressionMixin {
-        Q_OBJECT
-    public:
-        /** \brief class constructor */
-        explicit JKQTPXYLineGraph(JKQTBasePlotter* parent=nullptr);
-        /** \brief class constructor */
-        JKQTPXYLineGraph(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;
-        /** \brief returns the color to be used for the key label */
-        virtual QColor getKeyLabelColor() const override;
-
-        /** \copydoc drawLine */
-        void setDrawLine(bool __value);
-        /** \copydoc drawLine */
-        bool getDrawLine() const;
-
-        /** \brief set color of line and symbol */
-        void setColor(QColor c);
-
-    protected:
-
-        /** \brief indicates whether to draw a line or not */
-        bool drawLine;
-
-
-
-
-};
-
-
-
-
-
-
-
-
-
 /*! \brief This implements xy scatter plots (like JKQTPXYLineGraph), but the color and size of the symbols may be taken from a column.
     \ingroup jkqtplotter_linesymbolgraphs_param
 
@@ -383,43 +331,6 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPXYParametrizedScatterGraph: public JKQTPXYGrap
 
 
 
-/*! \brief This implements xy line plots with x and y error indicators.
-    \ingroup jkqtplotter_linesymbolgraphs_simple
-
-    \image html plot_errorbarlineplots.png
-    \image html plot_errorlinelineplots.png
-    \image html plot_errorpolygonlineplots.png
-
-    \see jkqtpstatAddXYErrorLineGraph(), jkqtpstatAddXErrorLineGraph(), jkqtpstatAddYErrorLineGraph(), \ref JKQTPlotterErrorBarStyles, \ref JKQTPlotterBasicJKQTPDatastoreStatisticsGroupedStat
- */
-class JKQTPLOTTER_LIB_EXPORT JKQTPXYLineErrorGraph: public JKQTPXYLineGraph, public JKQTPXYGraphErrors {
-        Q_OBJECT
-    public:
-        /** \brief class constructor */
-        JKQTPXYLineErrorGraph(JKQTBasePlotter* parent=nullptr);
-        /** \brief class constructor */
-        JKQTPXYLineErrorGraph(JKQTPlotter* parent);
-
-        /** \brief get the maximum and minimum x-value of the graph
-         *
-         * The result is given in the two parameters which are call-by-reference parameters!
-         */
-        virtual bool getXMinMax(double& minx, double& maxx, double& smallestGreaterZero) override;
-        /** \brief get the maximum and minimum y-value of the graph
-         *
-         * The result is given in the two parameters which are call-by-reference parameters!
-         */
-        virtual bool getYMinMax(double& miny, double& maxy, double& smallestGreaterZero) override;
-        /** \copydoc JKQTPGraph::usesColumn() */
-        virtual bool usesColumn(int c) const override;
-
-    protected:
-        /** \brief this function is used to plot error inidcators before plotting the graphs. */
-        virtual void drawErrorsBefore(JKQTPEnhancedPainter& painter)  override;
-};
-
-
-
 /*! \brief This implements xy scatter plots (like JKQTPXYLineGraph), but the color and size of the symbols may be taken from a column. with errorbars
     \ingroup jkqtplotter_linesymbolgraphs_param
 
@@ -464,4 +375,4 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPXYParametrizedErrorScatterGraph: public JKQTPX
 
 
 
-#endif // jkqtpgraphs_H
+#endif // jkqtpscatter_H