From 60a4656dd8a7e35de3f6ff72d3804a8ecf799235 Mon Sep 17 00:00:00 2001
From: jkriege2 <jan@jkrieger.de>
Date: Thu, 22 Sep 2022 00:44:54 +0200
Subject: [PATCH] NEW: Added new JKQTPCALabelType elements (JKQTPCALTfrac...),
 so axis label ticks can be displayed as fractions 1/2 instead of 0.5 NEW:
 Added new JKQTPCALabelType element JKQTPCALTscientific, so axis label ticks
 can be displayed as numbers in scientific notation like 1.2E-34 auto-generate
 JKQTPCALabelType documentation

---
 doc/CMakeLists.txt                            |   8 +
 doc/dox/whatsnew.dox                          |   2 +
 doc/images/JKQTPCALTdate.png                  | Bin 9457 -> 3005 bytes
 doc/images/JKQTPCALTdatetime.png              | Bin 0 -> 3238 bytes
 doc/images/JKQTPCALTdefault.png               | Bin 3025 -> 2085 bytes
 doc/images/JKQTPCALTexponent.png              | Bin 3225 -> 2267 bytes
 doc/images/JKQTPCALTexponentCharacter.png     | Bin 0 -> 3538 bytes
 doc/images/JKQTPCALTfrac.png                  | Bin 0 -> 2040 bytes
 doc/images/JKQTPCALTintfrac.png               | Bin 0 -> 2131 bytes
 doc/images/JKQTPCALTintsfrac.png              | Bin 0 -> 2471 bytes
 doc/images/JKQTPCALTintslashfrac.png          | Bin 0 -> 2328 bytes
 doc/images/JKQTPCALTscientific.png            | Bin 0 -> 1936 bytes
 doc/images/JKQTPCALTsfrac.png                 | Bin 0 -> 2458 bytes
 doc/images/JKQTPCALTslashfrac.png             | Bin 0 -> 2278 bytes
 doc/images/JKQTPCALTtime.png                  | Bin 9070 -> 1893 bytes
 lib/jkqtcommon/jkqtpmathtools.cpp             |  39 ++
 lib/jkqtcommon/jkqtpmathtools.h               |  11 +
 lib/jkqtcommon/jkqtpstringtools.cpp           |  60 ++-
 lib/jkqtcommon/jkqtpstringtools.h             |   9 +-
 lib/jkqtplotter/gui/jkqtpcomboboxes.cpp       |   4 +
 lib/jkqtplotter/jkqtpcoordinateaxes.cpp       | 131 ++++---
 lib/jkqtplotter/jkqtpcoordinateaxes.h         |   4 +
 lib/jkqtplotter/jkqtptools.cpp                |  16 +-
 lib/jkqtplotter/jkqtptools.h                  |  14 +-
 .../jkqtplotter_doc_imagegenerator.cpp        | 343 +++++++++++-------
 25 files changed, 446 insertions(+), 195 deletions(-)
 create mode 100644 doc/images/JKQTPCALTdatetime.png
 create mode 100644 doc/images/JKQTPCALTexponentCharacter.png
 create mode 100644 doc/images/JKQTPCALTfrac.png
 create mode 100644 doc/images/JKQTPCALTintfrac.png
 create mode 100644 doc/images/JKQTPCALTintsfrac.png
 create mode 100644 doc/images/JKQTPCALTintslashfrac.png
 create mode 100644 doc/images/JKQTPCALTscientific.png
 create mode 100644 doc/images/JKQTPCALTsfrac.png
 create mode 100644 doc/images/JKQTPCALTslashfrac.png

diff --git a/doc/CMakeLists.txt b/doc/CMakeLists.txt
index e46ceef9aa..94cf7e8eb3 100644
--- a/doc/CMakeLists.txt
+++ b/doc/CMakeLists.txt
@@ -114,6 +114,14 @@ if(JKQtPlotter_BUILD_TOOLS)
     )
     add_dependencies(JKQTPlotter_GenerateDocImages JKQTPlotter_GenerateDocImages_listerrorindicators)
 
+    add_custom_target(JKQTPlotter_GenerateDocImages_listaxislabeltype
+        COMMENT "Building JKQTPlotter Documentation Images: listaxislabeltype"
+        COMMAND ${JKQTPlotter_GenerateDocImages_COMMAND} --listaxislabeltype --background=lightgrey --iconsize=50 --outputdir="${JKQTPlotter_GenerateDocImages_OutputDir}/"
+        WORKING_DIRECTORY ${JKQtPlotter_QT_BINDIR}
+        DEPENDS jkqtplotter_doc_imagegenerator
+    )
+    add_dependencies(JKQTPlotter_GenerateDocImages JKQTPlotter_GenerateDocImages_listaxislabeltype)
+
 endif(JKQtPlotter_BUILD_TOOLS)
 
 
diff --git a/doc/dox/whatsnew.dox b/doc/dox/whatsnew.dox
index 4cda84510c..b92c99044b 100644
--- a/doc/dox/whatsnew.dox
+++ b/doc/dox/whatsnew.dox
@@ -52,6 +52,8 @@ Changes, compared to  \ref page_whatsnew_V4_0_0 "v4.0.0" include:
     <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>
     <li>NEW: Added signals JKQTBasePlotter::beforeExporting()/JKQTBasePlotter::afterExporting() and JKQTBasePlotterJKQTBasePlotter:beforePrinting()/JKQTBasePlotter::afterPrinting() which allow to modify the plot just before and just after an export/print</li>
+    <li>NEW: Added new JKQTPCALabelType elements (JKQTPCALTfrac...), so axis label ticks can be displayed as fractions 1/2 instead of 0.5</li>
+    <li>NEW: Added new JKQTPCALabelType element JKQTPCALTscientific, so axis label ticks can be displayed as numbers in scientific notation like \c 1.2E-34 </li>
   </ul></li>
   
   <li>JKQTMathText:<ul>
diff --git a/doc/images/JKQTPCALTdate.png b/doc/images/JKQTPCALTdate.png
index d0033e67cb5f43c1e83082a45cc1ed55ff5ab129..3f1cda00996b84f6c2681ba9836b480de085b5b0 100644
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diff --git a/doc/images/JKQTPCALTdefault.png b/doc/images/JKQTPCALTdefault.png
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diff --git a/doc/images/JKQTPCALTexponent.png b/doc/images/JKQTPCALTexponent.png
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diff --git a/lib/jkqtcommon/jkqtpmathtools.cpp b/lib/jkqtcommon/jkqtpmathtools.cpp
index be86600b53..311c5c97da 100644
--- a/lib/jkqtcommon/jkqtpmathtools.cpp
+++ b/lib/jkqtcommon/jkqtpmathtools.cpp
@@ -22,3 +22,42 @@
 #include <cmath>
 
 
+
+uint64_t jkqtp_gcd(uint64_t a, uint64_t b)
+{
+    if (a == 0)
+        return b;
+    else if (b == 0)
+        return a;
+
+    if (a < b)
+        return jkqtp_gcd(a, b % a);
+    else
+        return jkqtp_gcd(b, a % b);
+}
+
+void jkqtp_estimateFraction(double input, int& sign, uint64_t &intpart, uint64_t &num, uint64_t &denom, unsigned int precision)
+{
+    // see https://stackoverflow.com/a/28662740
+    //     https://stackoverflow.com/questions/4819075/how-to-output-fraction-instead-of-decimal-number
+    //     https://stackoverflow.com/a/64828741
+    //     https://stackoverflow.com/questions/26643695/converting-a-floating-point-decimal-value-to-a-fraction
+    sign=+1;
+    if (input<0.0) {
+        sign=-1;
+        input=fabs(input);
+    }
+    // now input is guaranteed positive and sign stores the sign +1 or -1
+    const double integral = std::floor(input);
+    const double frac = input - integral;
+
+    const double prec = pow(10,precision); // This is the accuracy.
+
+    uint64_t gcd_ = jkqtp_gcd(static_cast<uint64_t>(round(frac * prec)), static_cast<uint64_t>(prec));
+
+    denom = static_cast<uint64_t>(prec / gcd_);
+    num = static_cast<uint64_t>(round(frac * prec) / gcd_);
+
+    intpart=static_cast<uint64_t>(integral);
+
+}
diff --git a/lib/jkqtcommon/jkqtpmathtools.h b/lib/jkqtcommon/jkqtpmathtools.h
index be80ff110e..cb0aab3388 100644
--- a/lib/jkqtcommon/jkqtpmathtools.h
+++ b/lib/jkqtcommon/jkqtpmathtools.h
@@ -528,4 +528,15 @@ QString jkqtp_polynomialModel2Latex(PolyItP firstP, PolyItP lastP) {
     return str;
 }
 
+/*! \brief calculate the grwates common divisor (GCD) of \a a and \a b
+    \ingroup jkqtptools_math_basic
+
+    */
+JKQTCOMMON_LIB_EXPORT uint64_t jkqtp_gcd(uint64_t a, uint64_t b);
+
+/*! \brief calculates numeratur integer part \a intpart , \a num and denominator \a denom of a fraction, representing a given floating-point number \a input
+    \ingroup jkqtptools_math_basic
+
+    */
+JKQTCOMMON_LIB_EXPORT void jkqtp_estimateFraction(double input, int &sign, uint64_t &intpart, uint64_t& num, uint64_t& denom, unsigned int precision=9);
 #endif // jkqtpmathtools_H_INCLUDED
diff --git a/lib/jkqtcommon/jkqtpstringtools.cpp b/lib/jkqtcommon/jkqtpstringtools.cpp
index 24597e6444..85334bd344 100644
--- a/lib/jkqtcommon/jkqtpstringtools.cpp
+++ b/lib/jkqtcommon/jkqtpstringtools.cpp
@@ -170,22 +170,23 @@ std::string jkqtp_tolower(const std::string& s){
 };
 
 
- std::string jkqtp_floattounitstr(double data, int past_comma, bool remove_trail0){
-   if (data==0) return "0";
+ std::string jkqtp_floattounitstr(double data, int past_comma, bool remove_trail0, double belowIsZero){
+   if (fabs(data)<=belowIsZero) return "0";
    std::string form="%."+jkqtp_inttostr(past_comma)+"lf";
    std::string res=jkqtp_format(form,data);
-   if (fabs(data)>=1e3) res=jkqtp_format(form,data/1e3)+"k";
-   if (fabs(data)>=1e6) res=jkqtp_format(form,data/1e6)+"M";
-   if (fabs(data)>=1e9) res=jkqtp_format(form,data/1e9)+"G";
-   if (fabs(data)>=1e12) res=jkqtp_format(form,data/1e12)+"T";
-   if (fabs(data)>=1e15) res=jkqtp_format(form,data/1e15)+"P";
-   if (fabs(data)<1) res=jkqtp_format(form,data/1e-3)+"m";
-   if (fabs(data)<1e-3) res=jkqtp_format(form,data/1e-6)+"u";
-   if (fabs(data)<1e-6) res=jkqtp_format(form,data/1e-9)+"n";
-   if (fabs(data)<1e-9) res=jkqtp_format(form,data/1e-12)+"f";
+   std::string unit="";
+   if (fabs(data)>=1e3) {res=jkqtp_format(form,data/1e3); unit="k";}
+   if (fabs(data)>=1e6) {res=jkqtp_format(form,data/1e6); unit="M";}
+   if (fabs(data)>=1e9) {res=jkqtp_format(form,data/1e9); unit="G";}
+   if (fabs(data)>=1e12) {res=jkqtp_format(form,data/1e12); unit="T";}
+   if (fabs(data)>=1e15) {res=jkqtp_format(form,data/1e15); unit="P";}
+   if (fabs(data)<1) {res=jkqtp_format(form,data/1e-3); unit="m";}
+   if (fabs(data)<1e-3) {res=jkqtp_format(form,data/1e-6); unit="u";}
+   if (fabs(data)<1e-6) {res=jkqtp_format(form,data/1e-9); unit="n";}
+   if (fabs(data)<1e-9) {res=jkqtp_format(form,data/1e-12); unit="f";}
    if (fabs(data)==0) res=jkqtp_format(form,data);
    if (remove_trail0) {
-       if (data==0) return "0";
+       if (fabs(data)<=belowIsZero) return "0";
        if (res.find('.')==std::string::npos) return res;
        size_t i=res.size()-1;
        while (i>0 && res[i]=='0') {
@@ -194,10 +195,39 @@ std::string jkqtp_tolower(const std::string& s){
        if (res[i]=='.') i--; // remove decimal divider
        return res.erase(i+1);
    }
-   return res;
+   return res+unit;
  }
 
- std::string jkqtp_floattolatexstr(double data, int past_comma, bool remove_trail0, double belowIsZero, double minNoExponent, double maxNoExponent, bool ensurePlusMinus){
+
+ std::string jkqtp_floattolatexunitstr(double data, int past_comma, bool remove_trail0, double belowIsZero){
+   if (fabs(data)<=belowIsZero) return "0";
+   std::string form="%."+jkqtp_inttostr(past_comma)+"lf";
+   std::string res=jkqtp_format(form,data);
+   std::string unit="";
+   if (fabs(data)>=1e3) {res=jkqtp_format(form,data/1e3); unit="\\mathrm{k}";}
+   if (fabs(data)>=1e6) {res=jkqtp_format(form,data/1e6); unit="\\;\\mathrm{M}";}
+   if (fabs(data)>=1e9) {res=jkqtp_format(form,data/1e9); unit="\\;\\mathrm{G}";}
+   if (fabs(data)>=1e12) {res=jkqtp_format(form,data/1e12); unit="\\;\\mathrm{T}";}
+   if (fabs(data)>=1e15) {res=jkqtp_format(form,data/1e15); unit="\\;\\mathrm{P}";}
+   if (fabs(data)<1) {res=jkqtp_format(form,data/1e-3); unit="\\;\\mathrm{m}";}
+   if (fabs(data)<1e-3) {res=jkqtp_format(form,data/1e-6); unit="\\;\\mathrm{\\mu}";}
+   if (fabs(data)<1e-6) {res=jkqtp_format(form,data/1e-9); unit="\\;\\mathrm{n}";}
+   if (fabs(data)<1e-9) {res=jkqtp_format(form,data/1e-12); unit="\\;\\mathrm{f}";}
+   if (fabs(data)==0) res=jkqtp_format(form,data);
+   if (remove_trail0) {
+       if (fabs(data)<=belowIsZero) return "0";
+       if (res.find('.')==std::string::npos) return res+unit;
+       size_t i=res.size()-1;
+       while (i>0 && res[i]=='0') {
+           i--;
+       }
+       if (res[i]=='.') i--; // remove decimal divider
+       return res.erase(i+1)+unit;
+   }
+   return res+unit;
+ }
+
+ std::string jkqtp_floattolatexstr(double data, int past_comma, bool remove_trail0, double belowIsZero, double minNoExponent, double maxNoExponent, bool ensurePlusMinus, const std::string &multOperator){
    if ((belowIsZero>0) && (fabs(data)<belowIsZero)) {
        if (ensurePlusMinus) return "+\\rm{0}";
        else return "\\rm{0}";
@@ -214,7 +244,7 @@ std::string jkqtp_tolower(const std::string& s){
    if ((minNoExponent>fabs(data)) || (fabs(data)>maxNoExponent)) {
        std::string v=jkqtp_floattostr(data/pow(10.0, static_cast<double>(exp)), past_comma, remove_trail0);
        if (v!="1" && v!="10")  {
-           res=v+std::string("{\\times}10^{")+jkqtp_inttostr(exp)+"}";
+           res=v+std::string("{")+multOperator+std::string("}10^{")+jkqtp_inttostr(exp)+"}";
        } else {
            if (v=="10") exp=exp+1;
            res=std::string("10^{")+jkqtp_inttostr(exp)+"}";
diff --git a/lib/jkqtcommon/jkqtpstringtools.h b/lib/jkqtcommon/jkqtpstringtools.h
index 9d523f3705..8835a40f8c 100644
--- a/lib/jkqtcommon/jkqtpstringtools.h
+++ b/lib/jkqtcommon/jkqtpstringtools.h
@@ -26,6 +26,7 @@
 #include <QLocale>
 #include <string>
 #include <QtGlobal>
+#include <limits>
 
 /** \brief converts a QT::PenStyle into a string
  * \ingroup jkqtptools_string
@@ -231,11 +232,15 @@ JKQTCOMMON_LIB_EXPORT std::string jkqtp_to_valid_variable_name(const std::string
 /** \brief convert a double to a string, encoding powers of ten as characters, e.g. \c jkqtp_floattounitstr(1000) will result in "1k"
  * \ingroup jkqtptools_string
  */
-JKQTCOMMON_LIB_EXPORT std::string jkqtp_floattounitstr(double data, int past_comma=5, bool remove_trail0=false);
+JKQTCOMMON_LIB_EXPORT std::string jkqtp_floattounitstr(double data, int past_comma=5, bool remove_trail0=false, double belowIsZero=std::numeric_limits<double>::min()*4);
+/** \brief convert a double to a LaTeX-encoded string, encoding powers of ten as characters, e.g. \c jkqtp_floattounitstr(1000) will result in "1k"
+ * \ingroup jkqtptools_string
+ */
+JKQTCOMMON_LIB_EXPORT std::string jkqtp_floattolatexunitstr(double data, int past_comma=5, bool remove_trail0=false, double belowIsZero=std::numeric_limits<double>::min()*4);
 /** \brief convert a double to a string, encoding powers of ten as exponent in LaTeX notation (e.g. <code>-1.23\\cdot 10^{-5}</code>)
  * \ingroup jkqtptools_string
  */
-JKQTCOMMON_LIB_EXPORT std::string jkqtp_floattolatexstr(double data, int past_comma=5, bool remove_trail0=false, double belowIsZero=1e-16, double minNoExponent=1e-3, double maxNoExponent=1e4, bool ensurePlusMinus=false);
+JKQTCOMMON_LIB_EXPORT std::string jkqtp_floattolatexstr(double data, int past_comma=5, bool remove_trail0=false, double belowIsZero=1e-16, double minNoExponent=1e-3, double maxNoExponent=1e4, bool ensurePlusMinus=false, const std::string& multOperator="\\times");
 /** \brief convert a double to a string, encoding powers of ten as exponent with HTML tags
  * \ingroup jkqtptools_string
  */
diff --git a/lib/jkqtplotter/gui/jkqtpcomboboxes.cpp b/lib/jkqtplotter/gui/jkqtpcomboboxes.cpp
index 9347edfdf4..004e53bd2c 100644
--- a/lib/jkqtplotter/gui/jkqtpcomboboxes.cpp
+++ b/lib/jkqtplotter/gui/jkqtpcomboboxes.cpp
@@ -345,10 +345,14 @@ JKQTPCALabelTypeComboBox::JKQTPCALabelTypeComboBox(QWidget *parent):
     setEditable(false);
     addLabelType(JKQTPCALTexponent, tr("exponent"), QIcon(":/JKQTPlotter/jkqtp_ticks_exp.png"));
     addLabelType(JKQTPCALTdefault, tr("default"), QIcon(":/JKQTPlotter/jkqtp_ticks_default.png"));
+    addLabelType(JKQTPCALTdefault, tr("scientific"), QIcon(":/JKQTPlotter/jkqtp_ticks_scientific.png"));
     addLabelType(JKQTPCALTexponentCharacter, tr("character"), QIcon(":/JKQTPlotter/jkqtp_ticks_expchar.png"));
     addLabelType(JKQTPCALTtime, tr("time"), QIcon(":/JKQTPlotter/jkqtp_ticks_time.png"));
     addLabelType(JKQTPCALTdate, tr("date"), QIcon(":/JKQTPlotter/jkqtp_ticks_date.png"));
     addLabelType(JKQTPCALTdatetime, tr("datetime"), QIcon(":/JKQTPlotter/jkqtp_ticks_datetime.png"));
+    addLabelType(JKQTPCALTfrac, tr("fraction"), QIcon(":/JKQTPlotter/jkqtp_ticks_frac.png"));
+    addLabelType(JKQTPCALTsfrac, tr("\\sfrac fraction"), QIcon(":/JKQTPlotter/jkqtp_ticks_sfrac.png"));
+    addLabelType(JKQTPCALTslashfrac, tr("slash fraction"), QIcon(":/JKQTPlotter/jkqtp_ticks_slashfrac.png"));
     setCurrentIndex(0);
 }
 
diff --git a/lib/jkqtplotter/jkqtpcoordinateaxes.cpp b/lib/jkqtplotter/jkqtpcoordinateaxes.cpp
index d1410da5c4..9ba890e78c 100644
--- a/lib/jkqtplotter/jkqtpcoordinateaxes.cpp
+++ b/lib/jkqtplotter/jkqtpcoordinateaxes.cpp
@@ -21,6 +21,7 @@
 #include "jkqtplotter/jkqtpbaseplotter.h"
 #include "jkqtcommon/jkqtpdrawingtools.h"
 #include "jkqtcommon/jkqtpgeometrytools.h"
+#include "jkqtcommon/jkqtpmathtools.h"
 #include <QDebug>
 #include <QDateTime>
 #include <cfloat>
@@ -85,6 +86,7 @@ const JKQTMathText* JKQTPCoordinateAxis::getParentMathText() const {
     return parent->getMathText();
 }
 
+
 void JKQTPCoordinateAxis::clearAxisTickLabels() {
     tickLabels.clear();
     redrawPlot();
@@ -360,11 +362,40 @@ double JKQTPCoordinateAxis::calcLogTickSpacing() {
 
 }
 
+QString JKQTPCoordinateAxis::floattostringWithFormat(const QLocale & loc, double data, char format, int past_comma, bool remove_trail0) const
+{
+    QString res=loc.toString(data, format, past_comma);
+    if (remove_trail0 && res.contains(QLocale::system().decimalPoint())) {
+        QString expo="";
+        const int expIdx=res.toLower().indexOf('e');
+        if (expIdx>=0) {
+            expo=res.mid(expIdx);
+            res=res.left(expIdx);
+        }
+        while (res.size()>0 && res[res.size()-1]=='0') {
+            res=res.left(res.size()-1);
+        }
+        if (res.size()>0 && res[res.size()-1]==loc.decimalPoint()) res=res.left(res.size()-1);
+        res=res+expo;
+    }
+    return res;
+
+}
+QString JKQTPCoordinateAxis::floattostringWithFormat(double data, char format, int past_comma, bool remove_trail0) const
+{
+    QLocale loc=QLocale::system();
+    loc.setNumberOptions(QLocale::OmitGroupSeparator);
+    return floattostringWithFormat(loc, data, format, past_comma, remove_trail0);
+}
 
 QString JKQTPCoordinateAxis::floattolabel(double data) const {
-    int past_comma=axisStyle.labelDigits;
+    const int past_comma=axisStyle.labelDigits;
+    return floattolabel(data, past_comma);
+}
+
+QString JKQTPCoordinateAxis::floattolabel(double data, int past_comma) const {
     const bool remove_trail0=true;
-    QLocale loc=QLocale::system();
+    QLocale loc= QLocale::system();
     loc.setNumberOptions(QLocale::OmitGroupSeparator);
 
     double belowIsZero=1e-300;
@@ -373,22 +404,60 @@ QString JKQTPCoordinateAxis::floattolabel(double data) const {
     }
 
     switch(axisStyle.labelType) {
-        case JKQTPCALTdefault: {
-                QString res=loc.toString(data, 'f', past_comma);
-                if (remove_trail0 && res.contains(QLocale::system().decimalPoint())) {
-                    while (res.size()>0 && res[res.size()-1]=='0') {
-                        res=res.left(res.size()-1);
-                    }
-                    if (res.size()>0 && res[res.size()-1]==loc.decimalPoint()) res=res.left(res.size()-1);
+        case JKQTPCALTcount:
+            return "";
+        case JKQTPCALTdefault:
+            return floattostringWithFormat(loc, data, 'f', past_comma, remove_trail0);
+        case JKQTPCALTscientific:
+            return floattostringWithFormat(loc, data, 'e', past_comma, remove_trail0);
+        case JKQTPCALTexponent:
+            return QString(jkqtp_floattolatexstr(data, past_comma, remove_trail0, belowIsZero, pow(10, -past_comma), pow(10, past_comma+1)).c_str());
+        case JKQTPCALTexponentCharacter:
+            return QString(jkqtp_floattolatexunitstr(data, past_comma, remove_trail0).c_str());
+        case JKQTPCALTintfrac:
+        case JKQTPCALTintsfrac:
+        case JKQTPCALTintslashfrac:
+        case JKQTPCALTfrac:
+        case JKQTPCALTsfrac:
+        case JKQTPCALTslashfrac: {
+            uint64_t num=0;
+            uint64_t denom=0;
+            uint64_t intpart=0;
+            int sign=+1;
+            const double powfac=pow(10,past_comma);
+            const double rounded=round(data*powfac)/powfac;
+            jkqtp_estimateFraction(rounded, sign, intpart, num, denom);
+            //std::cout<<"\n"<<data<<" => "<<rounded<<", "<<sign<<"*( "<<intpart<<" + "<<num<<"/"<<denom<<" )\n";
+            if (axisStyle.labelType==JKQTPCALTfrac || axisStyle.labelType==JKQTPCALTsfrac || axisStyle.labelType==JKQTPCALTslashfrac) {
+                if (intpart>0) {
+                    num=num+denom*intpart;
+                    intpart=0;
                 }
-                return res;
-            }; break;
-        case JKQTPCALTexponent: {
-                return QString(jkqtp_floattolatexstr(data, past_comma, remove_trail0, belowIsZero, pow(10, -past_comma), pow(10, past_comma+1)).c_str());
-            }; break;
-        case JKQTPCALTexponentCharacter: {
-                return QString(jkqtp_floattounitstr(data, past_comma, remove_trail0).c_str());
-            }; break;
+            }
+            //std::cout<<data<<" => "<<rounded<<", "<<sign<<"*( "<<intpart<<" + "<<num<<"/"<<denom<<" )\n";
+            QString res;
+            if (rounded==0.0 || (intpart==0 && num==0)) res= "0";
+            else {
+                if (intpart==0 && sign<0) res+="-";
+                if (intpart!=0) res+=QString::number(intpart);
+                if (num!=0) {
+                    if (denom==1) res=QString::number(num);
+                    else {
+                        if (axisStyle.labelType==JKQTPCALTfrac || axisStyle.labelType==JKQTPCALTintfrac) res+=QString("\\frac{%1}{%2}").arg(num).arg(denom);
+                        else if (axisStyle.labelType==JKQTPCALTsfrac || axisStyle.labelType==JKQTPCALTintsfrac) res+=QString("\\sfrac{%1}{%2}").arg(num).arg(denom);
+                        else {
+                            if (res.size()>0 && res[res.size()-1].isDigit()) {
+                                if (sign<0) res+="-";
+                                else res+="+";
+                            }
+                            res+=QString("%1/%2").arg(num).arg(denom);
+                        }
+                    }
+                }
+            }
+            //std::cout<<data<<" => "<<rounded<<", "<<res.toStdString()<<"\n";
+            return res;
+        }
         case JKQTPCALTdate: {
                 QDateTime dt;
                 dt.setMSecsSinceEpoch(uint64_t(data));
@@ -404,38 +473,10 @@ QString JKQTPCoordinateAxis::floattolabel(double data) const {
                 dt.setMSecsSinceEpoch(uint64_t(data));
                 return dt.toString(axisStyle.tickDateTimeFormat);
             }; break;
-        default:
-            return QString();
-            break;
     }
-
-    /*
-    axisStyle.tickTimeFormat
-    axisStyle.tickDateFormat
-    axisStyle.tickDateTimeFormat
-     **/
-
     return QString();
 }
 
-QString JKQTPCoordinateAxis::floattolabel(double data, int past_comma) const {
-    bool remove_trail0=true;
-    QLocale loc=QLocale::system();
-    loc.setNumberOptions(QLocale::OmitGroupSeparator);
-    if (axisStyle.labelType==JKQTPCALTdefault) {
-        QString res=loc.toString(data, 'f', past_comma);//QString::number(data, 'f', past_comma);
-        if (remove_trail0 && res.contains(QLocale::system().decimalPoint())) {
-            while (res.size()>0 && res[res.size()-1]=='0') {
-                res=res.left(res.size()-1);
-            }
-            if (res.size()>0 && res[res.size()-1]==loc.decimalPoint()) res=res.left(res.size()-1);
-        }
-        return res;
-    } else if (axisStyle.labelType==JKQTPCALTexponent) return QString(jkqtp_floattolatexstr(data, past_comma, remove_trail0, 1e-300, pow(10, -past_comma), pow(10, past_comma+1)).c_str());
-    else if (axisStyle.labelType==JKQTPCALTexponentCharacter) return QString(jkqtp_floattounitstr(data, past_comma, remove_trail0).c_str());
-    return "";
-}
-
 int JKQTPCoordinateAxis::calcLinearUnitDigits() {
     if (!axisStyle.autoLabelDigits) return axisStyle.labelDigits;
     int unitdigits=-1;
diff --git a/lib/jkqtplotter/jkqtpcoordinateaxes.h b/lib/jkqtplotter/jkqtpcoordinateaxes.h
index 6101845429..f16fd7a5cb 100644
--- a/lib/jkqtplotter/jkqtpcoordinateaxes.h
+++ b/lib/jkqtplotter/jkqtpcoordinateaxes.h
@@ -588,6 +588,10 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPCoordinateAxis: public QObject {
         const JKQTMathText* getParentMathText() const;
 
 
+        /** \brief convert a float to a string using \a format (\c f|e|E|g|G ) with given number of decimals after comma \a past_comma and optional removal of trailing zeros behind decimal separator \a remove_trail0. Uses current local, disables not use Group-Separator */
+        QString floattostringWithFormat(const QLocale & loc, double data, char format, int past_comma, bool remove_trail0=true) const;
+        /** \brief convert a float to a string using \a format (\c f|e|E|g|G ) with given number of decimals after comma \a past_comma and optional removal of trailing zeros behind decimal separator \a remove_trail0. Uses current local, disables not use Group-Separator */
+        QString floattostringWithFormat(double data, char format, int past_comma, bool remove_trail0=true) const;
         /** \brief convert a float to a tick label string */
         QString floattolabel(double data) const;
 
diff --git a/lib/jkqtplotter/jkqtptools.cpp b/lib/jkqtplotter/jkqtptools.cpp
index 67b9600494..7577d0ed21 100644
--- a/lib/jkqtplotter/jkqtptools.cpp
+++ b/lib/jkqtplotter/jkqtptools.cpp
@@ -101,18 +101,32 @@ QString JKQTPCALabelType2String(JKQTPCALabelType pos) {
         case JKQTPCALTtime: return "time";
         case JKQTPCALTdate: return "date";
         case JKQTPCALTdatetime: return "datetime";
+        case JKQTPCALTscientific: return "scientific";
+        case JKQTPCALTintfrac: return "intfrac";
+        case JKQTPCALTintsfrac: return "intsfrac";
+        case JKQTPCALTintslashfrac: return "intslashfrac";
+        case JKQTPCALTfrac: return "frac";
+        case JKQTPCALTsfrac: return "sfrac";
+        case JKQTPCALTslashfrac: return "slashfrac";
     }
     return "";
 }
 
 JKQTPCALabelType String2JKQTPCALabelType(const QString& pos) {
     QString s=pos.trimmed().toLower();
-    if (s=="default") return JKQTPCALTdefault;
+    if (s=="default" || s=="f") return JKQTPCALTdefault;
+    if (s=="scientifc" || s=="g") return JKQTPCALTscientific;
     if (s=="exponent_character") return JKQTPCALTexponentCharacter;
     if (s=="exponent") return JKQTPCALTexponent;
     if (s=="time") return JKQTPCALTtime;
     if (s=="date") return JKQTPCALTdate;
     if (s=="datetime") return JKQTPCALTdatetime;
+    if (s=="frac") return JKQTPCALTfrac;
+    if (s=="sfrac") return JKQTPCALTsfrac;
+    if (s=="slashfrac") return JKQTPCALTslashfrac;
+    if (s=="intfrac") return JKQTPCALTintfrac;
+    if (s=="intsfrac") return JKQTPCALTintsfrac;
+    if (s=="intslashfrac") return JKQTPCALTintslashfrac;
     return JKQTPCALTdefault;
 }
 
diff --git a/lib/jkqtplotter/jkqtptools.h b/lib/jkqtplotter/jkqtptools.h
index cfa4a3a064..5c8403d7a4 100644
--- a/lib/jkqtplotter/jkqtptools.h
+++ b/lib/jkqtplotter/jkqtptools.h
@@ -439,13 +439,21 @@ JKQTPLOTTER_LIB_EXPORT JKQTPCADrawMode String2JKQTPCADrawMode(const QString& pos
  * \ingroup jkqtpplottersupprt */
 enum JKQTPCALabelType {
     JKQTPCALTdefault, /*!< \brief simply print the numbers \image html JKQTPCALTdefault.png */
-    JKQTPCALTexponentCharacter, /*!< \brief print the numbers and show a unit character, i.e. 5&mu; for \f$ 5\cdot 10^{-6} \f$ , \c 3k for \f$ 3\cdot 10^3 \f$ ...  */
+    JKQTPCALTscientific, /*!< \brief print the numbers in scientific notation, e.g. \c "1.23e-4" \image html JKQTPCALTscientific.png */
+    JKQTPCALTexponentCharacter, /*!< \brief print the numbers and show a unit character, i.e. 5&mu; for \f$ 5\cdot 10^{-6} \f$ , \c 3k for \f$ 3\cdot 10^3 \f$ ... \image html JKQTPCALTexponentCharacter.png */
     JKQTPCALTexponent, /*!< \brief show numbers in exponential for, e.g. \f$ 3\cdot 10^5 \f$ ... \image html JKQTPCALTexponent.png */
     JKQTPCALTdate, /*!< \brief show numbers as dates \image html JKQTPCALTdate.png */
     JKQTPCALTtime, /*!< \brief show numbers as times \image html JKQTPCALTtime.png*/
-    JKQTPCALTdatetime, /*!< \brief show numbers as times */
+    JKQTPCALTdatetime, /*!< \brief show numbers as times \image html JKQTPCALTdatetime.png */
+    JKQTPCALTfrac, /*!< \brief show numbers as fraction, the number is first rounded to the given precision and then a fraction is calculated and displayed like \$ \frac{1}{2} \f$ \image html JKQTPCALTfrac.png */
+    JKQTPCALTslashfrac, /*!< \brief show numbers as fraction, the number is first rounded to the given precision and then a fraction is calculated and displayed like \c 1/2 \image html JKQTPCALTslashfrac.png */
+    JKQTPCALTsfrac, /*!< \brief show numbers as fraction, the number is first rounded to the given precision and then a fraction is calculated and displayed using \c \\sfrac{1}{2} \f$ \image html JKQTPCALTsfrac.png */
+    JKQTPCALTintfrac, /*!< \brief show numbers as integral+fraction, the number is first rounded to the given precision and then a fraction is calculated and displayed like \$ \frac{1}{2} \f$ \image html JKQTPCALTintfrac.png */
+    JKQTPCALTintslashfrac, /*!< \brief show numbers as integral+fraction, the number is first rounded to the given precision and then a fraction is calculated and displayed like \c 1/2 \image html JKQTPCALTintslashfrac.png */
+    JKQTPCALTintsfrac, /*!< \brief show numbers as integral+fraction, the number is first rounded to the given precision and then a fraction is calculated and displayed using \c \\sfrac{1}{2} \f$ \image html JKQTPCALTintsfrac.png */
 
-    JKQTPCALTmax=JKQTPCALTdatetime
+    JKQTPCALTcount,
+    JKQTPCALTmax=JKQTPCALTcount-1
 };
 
 
diff --git a/tools/jkqtplotter_doc_imagegenerator/jkqtplotter_doc_imagegenerator.cpp b/tools/jkqtplotter_doc_imagegenerator/jkqtplotter_doc_imagegenerator.cpp
index b21ad0b538..bfc35808c9 100644
--- a/tools/jkqtplotter_doc_imagegenerator/jkqtplotter_doc_imagegenerator.cpp
+++ b/tools/jkqtplotter_doc_imagegenerator/jkqtplotter_doc_imagegenerator.cpp
@@ -14,6 +14,7 @@
 #include <QDir>
 #include <QTextStream>
 #include <algorithm>
+#include <QDateTime>
 #if (QT_VERSION>=QT_VERSION_CHECK(6, 0, 0))
 #include<QRegularExpression>
 #include<QRegularExpressionMatch>
@@ -47,6 +48,212 @@ void stopPaintingAndSave(QImage& img, JKQTPEnhancedPainter& p, const QString& fi
     img.save(filename);
 }
 
+void doListSymbols(const QDir& outputDir, int iconsize, QColor backgroundColor) {
+    for (uint64_t i=0; i<JKQTPSymbolCount; i++) {
+        const JKQTPGraphSymbols s=static_cast<JKQTPGraphSymbols>(i);
+        QImage  img;
+        JKQTPEnhancedPainter p;
+        startPainting(img, p, iconsize, backgroundColor);
+        JKQTPPlotSymbol(p, iconsize/2,iconsize/2,s,iconsize-4,2,QColor("blue"), QColor("salmon").lighter(120),QGuiApplication::font().family());
+        p.setPen(QPen(QColor("green"),0.5));
+        //p.drawRect(2,2,iconsize-4,iconsize-4);
+        stopPaintingAndSave(img, p, outputDir.absoluteFilePath(JKQTPGraphSymbols2String(s)+".png"));
+    }
+    QImage  img;
+    JKQTPEnhancedPainter p;
+    startPainting(img, p, iconsize, backgroundColor);
+    JKQTPPlotSymbol(p, iconsize/2,iconsize/2,JKQTPCharacterSymbol+QChar('@').unicode(),iconsize-4,1,QColor("blue"), QColor("salmon").lighter(120),QGuiApplication::font().family());
+    p.setPen(QPen(QColor("green"),0.5));
+    //p.drawRect(2,2,iconsize-4,iconsize-4);
+    stopPaintingAndSave(img, p, outputDir.absoluteFilePath("symbol_char_at.png"));
+    startPainting(img, p, iconsize, backgroundColor);
+    JKQTPPlotSymbol(p, iconsize/2,iconsize/2,JKQTPFilledCharacterSymbol+QChar('@').unicode(),iconsize-4,0.5,QColor("blue"), QColor("salmon").lighter(120),QGuiApplication::font().family());
+    p.setPen(QPen(QColor("green"),0.5));
+    //p.drawRect(2,2,iconsize-4,iconsize-4);
+    stopPaintingAndSave(img, p, outputDir.absoluteFilePath("symbol_filled_char_at.png"));
+    startPainting(img, p, iconsize, backgroundColor);
+    JKQTPPlotSymbol(p, iconsize/2,iconsize/2,JKQTPCharacterSymbol+QChar(0x2663).unicode(),iconsize-4,1,QColor("blue"), QColor("salmon").lighter(120),QGuiApplication::font().family());
+    p.setPen(QPen(QColor("green"),0.5));
+    //p.drawRect(2,2,iconsize-4,iconsize-4);
+    stopPaintingAndSave(img, p, outputDir.absoluteFilePath("symbol_char_club.png"));
+    startPainting(img, p, iconsize, backgroundColor);
+    JKQTPPlotSymbol(p, iconsize/2,iconsize/2,JKQTPFilledCharacterSymbol+QChar(0x2663).unicode(),iconsize-4,0.5,QColor("blue"), QColor("salmon").lighter(120),QGuiApplication::font().family());
+    p.setPen(QPen(QColor("green"),0.5));
+    //p.drawRect(2,2,iconsize-4,iconsize-4);
+    stopPaintingAndSave(img, p, outputDir.absoluteFilePath("symbol_filled_char_club.png"));
+
+    JKQTPCustomGraphSymbolFunctor f=[](QPainter& p) {
+        p.drawEllipse(QPointF(-0.2, -0.2), 0.3, 0.3);
+        p.setBrush(Qt::NoBrush);
+        p.drawEllipse(QPointF(0.2, -0.2), 0.3, 0.3);
+        p.drawEllipse(QPointF(0, 0.2), 0.3, 0.3);
+    };
+    JKQTPGraphSymbols customs=JKQTPRegisterCustomGraphSymbol(f);
+    startPainting(img, p, iconsize, backgroundColor);
+    JKQTPPlotSymbol(p, iconsize/2,iconsize/2,customs,iconsize-4,2,QColor("blue"), QColor("salmon").lighter(120),QGuiApplication::font().family());
+    p.setPen(QPen(QColor("green"),0.5));
+    stopPaintingAndSave(img, p, outputDir.absoluteFilePath("symbol_custom.png"));
+}
+
+void doListLineDecorators(const QDir& outputDir, int iconsize, QColor backgroundColor) {
+    for (uint64_t i=0; i<JKQTPLineDecoratorCount; i++) {
+        const JKQTPLineDecoratorStyle s=static_cast<JKQTPLineDecoratorStyle>(i);
+        QImage  img;
+        JKQTPEnhancedPainter p;
+        startPainting(img, p, iconsize*2,iconsize, backgroundColor);
+
+        p.setPen(QPen(QColor("red"), 1));
+        p.setBrush(p.pen().color().lighter());
+        JKQTPPlotDecoratedLine(p, QLineF(5, iconsize-14, iconsize, 7), JKQTPNoDecorator, 0, s, JKQTPLineDecoratorStyleCalcDecoratorSize(p.pen().widthF(), 9));
+
+        p.setPen(QPen(QColor("blue"), 2));
+        p.setBrush(p.pen().color().lighter());
+        JKQTPPlotDecoratedLine(p, QLineF(5, iconsize-5, iconsize*2-5, 17), JKQTPNoDecorator, 0, s, JKQTPLineDecoratorStyleCalcDecoratorSize(p.pen().widthF(), 9));
+
+        stopPaintingAndSave(img, p, outputDir.absoluteFilePath(JKQTPLineDecoratorStyle2String(s)+".png"));
+    }
+}
+
+
+void doListErrorIndicators(const QDir& outputDir, int iconsize, QColor backgroundColor) {
+    JKQTBasePlotter plot(true);
+    JKQTPDatastore* ds=plot.getDatastore();
+    size_t cx=ds->addCopiedColumn(QVector<double>{-1.5,-0.5,0.5,1.5,2.5},"x");
+    size_t cy=ds->addCopiedColumn(QVector<double>{-0.75,-0.3,-0.05,0.2,0.65},"y");
+    size_t cex=ds->addCopiedColumn(QVector<double>{0,0.2,0.1,0.45,0},"ex");
+    size_t cey=ds->addCopiedColumn(QVector<double>{0.05,0.1,0.3,0.3,0.05},"ey");
+
+    plot.setXY(-0.8,2.2,-0.5,0.7);
+    plot.setWidgetSize(150,50);
+    plot.setShowKey(false);
+    plot.setGrid(false);
+    plot.getXAxis()->setShowZeroAxis(false);
+    plot.getYAxis()->setShowZeroAxis(false);
+    plot.getXAxis()->setDrawMode1(JKQTPCADMnone);
+    plot.getXAxis()->setDrawMode2(JKQTPCADMnone);
+    plot.getYAxis()->setDrawMode1(JKQTPCADMnone);
+    plot.getYAxis()->setDrawMode2(JKQTPCADMnone);
+
+    JKQTPXYLineErrorGraph* g=new JKQTPXYLineErrorGraph(&plot);
+    g->setDrawLine(false);
+    g->setLineStyle(Qt::DotLine);
+    g->setSymbolType(JKQTPCross);
+    g->setSymbolSize(6);
+    g->setXColumn(cx);
+    g->setYColumn(cy);
+    g->setXErrorColumn(cex);
+    g->setYErrorColumn(cey);
+    plot.addGraph(g);
+    const  std::vector<std::tuple<QString, JKQTPErrorPlotstyle, JKQTPErrorPlotstyle, bool, bool>> plots=
+    {
+        {"JKQTPNoError", JKQTPNoError, JKQTPNoError, true, false},
+        {"JKQTPErrorSimpleBars", JKQTPErrorSimpleBars, JKQTPErrorSimpleBars, false, false},
+        {"JKQTPErrorLines", JKQTPNoError, JKQTPErrorLines, true, false},
+        {"JKQTPErrorPolygons", JKQTPNoError, JKQTPErrorPolygons, true, false},
+        {"JKQTPErrorEllipses", JKQTPErrorEllipses, JKQTPErrorEllipses, false, false},
+        {"JKQTPErrorBoxes", JKQTPErrorBoxes, JKQTPErrorBoxes, false, false},
+        {"JKQTPErrorArrows", JKQTPErrorArrows, JKQTPErrorArrows, false, false},
+        {"JKQTPErrorInwardArrows", JKQTPErrorInwardArrows, JKQTPErrorInwardArrows, false, false},
+        {"JKQTPErrorBars", JKQTPErrorBars, JKQTPErrorBars, false, false},
+        {"JKQTPErrorSimpleBarsPolygons", JKQTPNoError, JKQTPErrorSimpleBarsPolygons, true, false},
+        {"JKQTPErrorSimpleBarsLines", JKQTPNoError, JKQTPErrorSimpleBarsLines, true, false},
+        {"JKQTPErrorBarsLines", JKQTPNoError, JKQTPErrorBarsLines, true, false},
+        {"JKQTPErrorBarsPolygons", JKQTPNoError, JKQTPErrorBarsPolygons, true, false},
+        {"JKQTPErrorHalfBarsOutwards", JKQTPErrorHalfBarsOutwards, JKQTPErrorHalfBarsOutwards, false,true},
+        {"JKQTPErrorHalfBarsInwards", JKQTPErrorHalfBarsInwards, JKQTPErrorHalfBarsInwards, false,true},
+        {"JKQTPErrorHalfBarsAbove", JKQTPErrorHalfBarsAbove, JKQTPErrorHalfBarsAbove, false,true},
+        {"JKQTPErrorHalfBarsBelow", JKQTPErrorHalfBarsBelow, JKQTPErrorHalfBarsBelow, false,true},
+        {"JKQTPErrorIndicatorArrows", JKQTPErrorIndicatorArrows, JKQTPErrorIndicatorArrows, false, false},
+        {"JKQTPErrorIndicatorInwardArrows", JKQTPErrorIndicatorInwardArrows, JKQTPErrorIndicatorInwardArrows, false, false},
+        {"JKQTPErrorIndicatorBar", JKQTPErrorIndicatorBar, JKQTPErrorIndicatorBar, false, false},
+    };
+    for (const auto& d: plots) {
+        g->setDrawLine(std::get<3>(d));
+        g->setXErrorStyle(std::get<1>(d));
+        g->setYErrorStyle(std::get<2>(d));
+        plot.getXAxis()->setShowZeroAxis(std::get<4>(d));
+        plot.getYAxis()->setShowZeroAxis(std::get<4>(d));
+
+        plot.saveAsPixelImage(outputDir.absoluteFilePath(std::get<0>(d)+".png"), false, "png");
+    }
+}
+
+void doListJKQTPCALabelType(const QDir& outputDir, int iconsize, QColor backgroundColor) {
+    JKQTBasePlotter plot(true);
+
+    plot.setXY(0,1,0.9,110);
+    plot.setWidgetSize(iconsize*4,4*iconsize);
+    plot.setShowKey(false);
+    plot.setGrid(true);
+    plot.setExportBackgroundColor(QColor("lightgrey"));
+    plot.getXAxis()->setShowZeroAxis(false);
+    plot.getYAxis()->setShowZeroAxis(false);
+    plot.getXAxis()->setDrawMode1(JKQTPCADMLine);
+    plot.getXAxis()->setDrawMode2(JKQTPCADMLine);
+    plot.getXAxis()->setDrawGrid(false);
+    plot.getYAxis()->setDrawMode1(JKQTPCADMLineTicksTickLabels);
+    plot.getYAxis()->setDrawMode2(JKQTPCADMnone);
+    plot.getYAxis()->setAxisLabel("");
+
+
+    plot.getYAxis()->setLabelType(JKQTPCALTdefault);
+    plot.setY(0,110);
+    plot.grabPixelImage(QSize(plot.getWidth(),plot.getHeight()), false).copy(0,0,iconsize,plot.getHeight()).save(outputDir.absoluteFilePath("JKQTPCALTdefault.png"), "png");
+
+    plot.setY(1e-6,1.1e3);
+    plot.getYAxis()->setMinTicks(7);
+    plot.getYAxis()->setLabelType(JKQTPCALTexponentCharacter);
+    plot.getYAxis()->setLogAxis(true);
+    plot.grabPixelImage(QSize(plot.getWidth(),plot.getHeight()), false).copy(0,0,iconsize*2,plot.getHeight()).save(outputDir.absoluteFilePath("JKQTPCALTexponentCharacter.png"), "png");
+
+    plot.getYAxis()->setLogAxis(false);
+    plot.setY(-1.3, 1.55);
+    plot.getYAxis()->setMinTicks(5);
+    plot.getYAxis()->setLabelType(JKQTPCALTintfrac);
+    plot.grabPixelImage(QSize(plot.getWidth(),plot.getHeight()), false).copy(0,0,iconsize*2,plot.getHeight()).save(outputDir.absoluteFilePath("JKQTPCALTintfrac.png"), "png");
+    plot.getYAxis()->setLabelType(JKQTPCALTintsfrac);
+    plot.grabPixelImage(QSize(plot.getWidth(),plot.getHeight()), false).copy(0,0,iconsize*2,plot.getHeight()).save(outputDir.absoluteFilePath("JKQTPCALTintsfrac.png"), "png");
+    plot.getYAxis()->setLabelType(JKQTPCALTintslashfrac);
+    plot.grabPixelImage(QSize(plot.getWidth(),plot.getHeight()), false).copy(0,0,iconsize*2,plot.getHeight()).save(outputDir.absoluteFilePath("JKQTPCALTintslashfrac.png"), "png");
+    plot.getYAxis()->setLabelType(JKQTPCALTfrac);
+    plot.grabPixelImage(QSize(plot.getWidth(),plot.getHeight()), false).copy(0,0,iconsize*2,plot.getHeight()).save(outputDir.absoluteFilePath("JKQTPCALTfrac.png"), "png");
+    plot.getYAxis()->setLabelType(JKQTPCALTsfrac);
+    plot.grabPixelImage(QSize(plot.getWidth(),plot.getHeight()), false).copy(0,0,iconsize*2,plot.getHeight()).save(outputDir.absoluteFilePath("JKQTPCALTsfrac.png"), "png");
+    plot.getYAxis()->setLabelType(JKQTPCALTslashfrac);
+    plot.grabPixelImage(QSize(plot.getWidth(),plot.getHeight()), false).copy(0,0,iconsize*2,plot.getHeight()).save(outputDir.absoluteFilePath("JKQTPCALTslashfrac.png"), "png");
+
+    plot.setY(0.000008,100000);
+    plot.getYAxis()->setMinTicks(4);
+    plot.getYAxis()->setLabelType(JKQTPCALTexponent);
+    plot.getYAxis()->setLogAxis(true);
+    plot.grabPixelImage(QSize(plot.getWidth(),plot.getHeight()), false).copy(0,0,iconsize,plot.getHeight()).save(outputDir.absoluteFilePath("JKQTPCALTexponent.png"), "png");
+
+    plot.setY(0.000008,100000);
+    plot.getYAxis()->setMinTicks(4);
+    plot.getYAxis()->setLabelType(JKQTPCALTscientific);
+    plot.getYAxis()->setLogAxis(true);
+    plot.grabPixelImage(QSize(plot.getWidth(),plot.getHeight()), false).copy(0,0,iconsize,plot.getHeight()).save(outputDir.absoluteFilePath("JKQTPCALTscientific.png"), "png");
+
+    plot.getYAxis()->setMinTicks(4);
+    plot.setY(QDateTime(QDate(1999,10,1),QTime(0,0,0)).toMSecsSinceEpoch(),
+              QDateTime(QDate(2000,2,1),QTime(0,0,0)).toMSecsSinceEpoch());
+    plot.getYAxis()->setLabelType(JKQTPCALTdate);
+    plot.getYAxis()->setLogAxis(false);
+    plot.grabPixelImage(QSize(plot.getWidth(),plot.getHeight()), false).copy(0,0,iconsize*2,plot.getHeight()).save(outputDir.absoluteFilePath("JKQTPCALTdate.png"), "png");
+
+    plot.setY(QDateTime(QDate(2000,2,1),QTime(12,0,0)).toMSecsSinceEpoch(),
+              QDateTime(QDate(2000,2,1),QTime(24,0,0)).toMSecsSinceEpoch());
+    plot.getYAxis()->setLabelType(JKQTPCALTtime);
+    plot.grabPixelImage(QSize(plot.getWidth(),plot.getHeight()), false).copy(0,0,iconsize*1.0,plot.getHeight()).save(outputDir.absoluteFilePath("JKQTPCALTtime.png"), "png");
+
+    plot.setY(QDateTime(QDate(2010,10,1),QTime(12,0,0)).toMSecsSinceEpoch(),
+              QDateTime(QDate(2010,10,2),QTime(12,0,0)).toMSecsSinceEpoch());
+    plot.getYAxis()->setLabelType(JKQTPCALTdatetime);
+    plot.grabPixelImage(QSize(plot.getWidth(),plot.getHeight()), false).copy(0,0,iconsize*2.5,plot.getHeight()).save(outputDir.absoluteFilePath("JKQTPCALTdatetime.png"), "png");
+
+
+}
+
 int main(int argc, char* argv[])
 {
     // 1. create Qt Appcilation object and a QCommandLineParser to go with it
@@ -63,6 +270,8 @@ int main(int argc, char* argv[])
     parser.addOption(listlinedecoratorsOption);
     QCommandLineOption listerrorindicatorsOption("listerrorindicators", "generate example images for all error-indicators.");
     parser.addOption(listerrorindicatorsOption);
+    QCommandLineOption listaxislabeltypeOption("listaxislabeltype", "generate example images for JKQTPCALabelType.");
+    parser.addOption(listaxislabeltypeOption);
     QCommandLineOption iconsizeOption("iconsize", "typical size of the generatued images.", "iconsize", "24");
     parser.addOption(iconsizeOption);
     QCommandLineOption backgroundOption("background", "background color.", "background", "white");
@@ -73,140 +282,16 @@ int main(int argc, char* argv[])
     const bool listsymbols=parser.isSet(listsymbolsOption);
     const bool listlinedecorators=parser.isSet(listlinedecoratorsOption);
     const bool listerrorindicators=parser.isSet(listerrorindicatorsOption);
+    const bool listaxislabeltype=parser.isSet(listaxislabeltypeOption);
     const int iconsize=parser.value(iconsizeOption).toInt();
     const QColor backgroundColor = jkqtp_String2QColor(parser.value(backgroundOption));
 
 
 
-    if (listsymbols) {
-        for (uint64_t i=0; i<JKQTPSymbolCount; i++) {
-            const JKQTPGraphSymbols s=static_cast<JKQTPGraphSymbols>(i);
-            QImage  img;
-            JKQTPEnhancedPainter p;
-            startPainting(img, p, iconsize, backgroundColor);
-            JKQTPPlotSymbol(p, iconsize/2,iconsize/2,s,iconsize-4,2,QColor("blue"), QColor("salmon").lighter(120),QGuiApplication::font().family());
-            p.setPen(QPen(QColor("green"),0.5));
-            //p.drawRect(2,2,iconsize-4,iconsize-4);
-            stopPaintingAndSave(img, p, outputDir.absoluteFilePath(JKQTPGraphSymbols2String(s)+".png"));
-        }
-        QImage  img;
-        JKQTPEnhancedPainter p;
-        startPainting(img, p, iconsize, backgroundColor);
-        JKQTPPlotSymbol(p, iconsize/2,iconsize/2,JKQTPCharacterSymbol+QChar('@').unicode(),iconsize-4,1,QColor("blue"), QColor("salmon").lighter(120),QGuiApplication::font().family());
-        p.setPen(QPen(QColor("green"),0.5));
-        //p.drawRect(2,2,iconsize-4,iconsize-4);
-        stopPaintingAndSave(img, p, outputDir.absoluteFilePath("symbol_char_at.png"));
-        startPainting(img, p, iconsize, backgroundColor);
-        JKQTPPlotSymbol(p, iconsize/2,iconsize/2,JKQTPFilledCharacterSymbol+QChar('@').unicode(),iconsize-4,0.5,QColor("blue"), QColor("salmon").lighter(120),QGuiApplication::font().family());
-        p.setPen(QPen(QColor("green"),0.5));
-        //p.drawRect(2,2,iconsize-4,iconsize-4);
-        stopPaintingAndSave(img, p, outputDir.absoluteFilePath("symbol_filled_char_at.png"));
-        startPainting(img, p, iconsize, backgroundColor);
-        JKQTPPlotSymbol(p, iconsize/2,iconsize/2,JKQTPCharacterSymbol+QChar(0x2663).unicode(),iconsize-4,1,QColor("blue"), QColor("salmon").lighter(120),QGuiApplication::font().family());
-        p.setPen(QPen(QColor("green"),0.5));
-        //p.drawRect(2,2,iconsize-4,iconsize-4);
-        stopPaintingAndSave(img, p, outputDir.absoluteFilePath("symbol_char_club.png"));
-        startPainting(img, p, iconsize, backgroundColor);
-        JKQTPPlotSymbol(p, iconsize/2,iconsize/2,JKQTPFilledCharacterSymbol+QChar(0x2663).unicode(),iconsize-4,0.5,QColor("blue"), QColor("salmon").lighter(120),QGuiApplication::font().family());
-        p.setPen(QPen(QColor("green"),0.5));
-        //p.drawRect(2,2,iconsize-4,iconsize-4);
-        stopPaintingAndSave(img, p, outputDir.absoluteFilePath("symbol_filled_char_club.png"));
+    if (listsymbols) doListSymbols(outputDir, iconsize, backgroundColor);
+    if (listlinedecorators) doListLineDecorators(outputDir, iconsize, backgroundColor);
+    if (listsymbols) doListErrorIndicators(outputDir, iconsize, backgroundColor);
+    if (listaxislabeltype) doListJKQTPCALabelType(outputDir, iconsize, backgroundColor);
 
-        JKQTPCustomGraphSymbolFunctor f=[](QPainter& p) {
-            p.drawEllipse(QPointF(-0.2, -0.2), 0.3, 0.3);
-            p.setBrush(Qt::NoBrush);
-            p.drawEllipse(QPointF(0.2, -0.2), 0.3, 0.3);
-            p.drawEllipse(QPointF(0, 0.2), 0.3, 0.3);
-        };
-        JKQTPGraphSymbols customs=JKQTPRegisterCustomGraphSymbol(f);
-        startPainting(img, p, iconsize, backgroundColor);
-        JKQTPPlotSymbol(p, iconsize/2,iconsize/2,customs,iconsize-4,2,QColor("blue"), QColor("salmon").lighter(120),QGuiApplication::font().family());
-        p.setPen(QPen(QColor("green"),0.5));
-        stopPaintingAndSave(img, p, outputDir.absoluteFilePath("symbol_custom.png"));
-    }
-
-    if (listlinedecorators) {
-        for (uint64_t i=0; i<JKQTPLineDecoratorCount; i++) {
-            const JKQTPLineDecoratorStyle s=static_cast<JKQTPLineDecoratorStyle>(i);
-            QImage  img;
-            JKQTPEnhancedPainter p;
-            startPainting(img, p, iconsize*2,iconsize, backgroundColor);
-
-            p.setPen(QPen(QColor("red"), 1));
-            p.setBrush(p.pen().color().lighter());
-            JKQTPPlotDecoratedLine(p, QLineF(5, iconsize-14, iconsize, 7), JKQTPNoDecorator, 0, s, JKQTPLineDecoratorStyleCalcDecoratorSize(p.pen().widthF(), 9));
-
-            p.setPen(QPen(QColor("blue"), 2));
-            p.setBrush(p.pen().color().lighter());
-            JKQTPPlotDecoratedLine(p, QLineF(5, iconsize-5, iconsize*2-5, 17), JKQTPNoDecorator, 0, s, JKQTPLineDecoratorStyleCalcDecoratorSize(p.pen().widthF(), 9));
-
-            stopPaintingAndSave(img, p, outputDir.absoluteFilePath(JKQTPLineDecoratorStyle2String(s)+".png"));
-        }
-    }
-
-    if (listerrorindicators) {
-        JKQTBasePlotter plot(true);
-        JKQTPDatastore* ds=plot.getDatastore();
-        size_t cx=ds->addCopiedColumn(QVector<double>{-1.5,-0.5,0.5,1.5,2.5},"x");
-        size_t cy=ds->addCopiedColumn(QVector<double>{-0.75,-0.3,-0.05,0.2,0.65},"y");
-        size_t cex=ds->addCopiedColumn(QVector<double>{0,0.2,0.1,0.45,0},"ex");
-        size_t cey=ds->addCopiedColumn(QVector<double>{0.05,0.1,0.3,0.3,0.05},"ey");
-
-        plot.setXY(-0.8,2.2,-0.5,0.7);
-        plot.setWidgetSize(150,50);
-        plot.setShowKey(false);
-        plot.setGrid(false);
-        plot.getXAxis()->setShowZeroAxis(false);
-        plot.getYAxis()->setShowZeroAxis(false);
-        plot.getXAxis()->setDrawMode1(JKQTPCADMnone);
-        plot.getXAxis()->setDrawMode2(JKQTPCADMnone);
-        plot.getYAxis()->setDrawMode1(JKQTPCADMnone);
-        plot.getYAxis()->setDrawMode2(JKQTPCADMnone);
-
-        JKQTPXYLineErrorGraph* g=new JKQTPXYLineErrorGraph(&plot);
-        g->setDrawLine(false);
-        g->setLineStyle(Qt::DotLine);
-        g->setSymbolType(JKQTPCross);
-        g->setSymbolSize(6);
-        g->setXColumn(cx);
-        g->setYColumn(cy);
-        g->setXErrorColumn(cex);
-        g->setYErrorColumn(cey);
-        plot.addGraph(g);
-        const  std::vector<std::tuple<QString, JKQTPErrorPlotstyle, JKQTPErrorPlotstyle, bool, bool>> plots=
-        {
-            {"JKQTPNoError", JKQTPNoError, JKQTPNoError, true, false},
-            {"JKQTPErrorSimpleBars", JKQTPErrorSimpleBars, JKQTPErrorSimpleBars, false, false},
-            {"JKQTPErrorLines", JKQTPNoError, JKQTPErrorLines, true, false},
-            {"JKQTPErrorPolygons", JKQTPNoError, JKQTPErrorPolygons, true, false},
-            {"JKQTPErrorEllipses", JKQTPErrorEllipses, JKQTPErrorEllipses, false, false},
-            {"JKQTPErrorBoxes", JKQTPErrorBoxes, JKQTPErrorBoxes, false, false},
-            {"JKQTPErrorArrows", JKQTPErrorArrows, JKQTPErrorArrows, false, false},
-            {"JKQTPErrorInwardArrows", JKQTPErrorInwardArrows, JKQTPErrorInwardArrows, false, false},
-            {"JKQTPErrorBars", JKQTPErrorBars, JKQTPErrorBars, false, false},
-            {"JKQTPErrorSimpleBarsPolygons", JKQTPNoError, JKQTPErrorSimpleBarsPolygons, true, false},
-            {"JKQTPErrorSimpleBarsLines", JKQTPNoError, JKQTPErrorSimpleBarsLines, true, false},
-            {"JKQTPErrorBarsLines", JKQTPNoError, JKQTPErrorBarsLines, true, false},
-            {"JKQTPErrorBarsPolygons", JKQTPNoError, JKQTPErrorBarsPolygons, true, false},
-            {"JKQTPErrorHalfBarsOutwards", JKQTPErrorHalfBarsOutwards, JKQTPErrorHalfBarsOutwards, false,true},
-            {"JKQTPErrorHalfBarsInwards", JKQTPErrorHalfBarsInwards, JKQTPErrorHalfBarsInwards, false,true},
-            {"JKQTPErrorHalfBarsAbove", JKQTPErrorHalfBarsAbove, JKQTPErrorHalfBarsAbove, false,true},
-            {"JKQTPErrorHalfBarsBelow", JKQTPErrorHalfBarsBelow, JKQTPErrorHalfBarsBelow, false,true},
-            {"JKQTPErrorIndicatorArrows", JKQTPErrorIndicatorArrows, JKQTPErrorIndicatorArrows, false, false},
-            {"JKQTPErrorIndicatorInwardArrows", JKQTPErrorIndicatorInwardArrows, JKQTPErrorIndicatorInwardArrows, false, false},
-            {"JKQTPErrorIndicatorBar", JKQTPErrorIndicatorBar, JKQTPErrorIndicatorBar, false, false},
-        };
-        for (const auto& d: plots) {
-            g->setDrawLine(std::get<3>(d));
-            g->setXErrorStyle(std::get<1>(d));
-            g->setYErrorStyle(std::get<2>(d));
-            plot.getXAxis()->setShowZeroAxis(std::get<4>(d));
-            plot.getYAxis()->setShowZeroAxis(std::get<4>(d));
-
-            plot.saveAsPixelImage(outputDir.absoluteFilePath(std::get<0>(d)+".png"), false, "png");
-        }
-
-
-    }
     return EXIT_SUCCESS;
 }