improved log-axis-example

README.md

@@ -29,7 +29,7 @@ All test-projects are Qt-projects that use qmake to build. You can load them int
 
 | Screenshot    | Description   | Notes         |
 |:-------------:| ------------- | ------------- |
-| [![](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/jkqtplotter_simpletest_logaxes_small.png)](https://github.com/jkriege2/JKQtPlotter/tree/master/test/jkqtplotter_simpletest_logaxes) | [logarithmic axes](https://github.com/jkriege2/JKQtPlotter/tree/master/test/jkqtplotter_simpletest_logaxes) | `JKQTPxyLineGraph` and `JKQTPgeoText`<br/>C++ vector of data<br/>logarithmic axes<br/>plot line styles<br/>internal LaTeX parser<br/>add commenting text to a graph |
+| [![](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/jkqtplotter_simpletest_logaxes_small.png)](https://github.com/jkriege2/JKQtPlotter/tree/master/test/jkqtplotter_simpletest_logaxes) | [logarithmic axes](https://github.com/jkriege2/JKQtPlotter/tree/master/test/jkqtplotter_simpletest_logaxes) | `JKQTPxyLineGraph` and `JKQTPgeoText`<br/>C++ vector of data<br/>logarithmic axes and styling<br/>plot line styles<br/>internal LaTeX parser<br/>add commenting text to a graph |
 | [![](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/jkqtplotter_simpletest_dateaxes_small.png)<br>![](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/jkqtplotter_simpletest_dateaxes_dates_small.png)<br>![](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/jkqtplotter_simpletest_dateaxes_timeaxis_small.png)](https://github.com/jkriege2/JKQtPlotter/tree/master/test/jkqtplotter_simpletest_dateaxes) | [date/time axes](https://github.com/jkriege2/JKQtPlotter/tree/master/test/jkqtplotter_simpletest_dateaxes) | `JKQTPxyLineGraph` and `JKQTPfilledVerticalRangeGraph`<br/>C++ vector of data<br/>date/time axes<br/>plot min/max range graph<br/>internal LaTeX parser<br/>data from CSV files |
 
 

lib/jkqtmathtext/jkqtmathtext.cpp

@@ -3263,7 +3263,7 @@ void JKQTmathText::useXITS()
 #ifdef AUTOLOAD_XITS_FONTS
     //qDebug()<<"has XITS: "<<fdb.families().contains("XITS");
     if (!fdb.families().contains("XITS")) {
-        int i;
+        int i=0;
         if (QFile::exists(":/JKQTmathText/fonts/xits-bold.otf")) { i=QFontDatabase::addApplicationFont(":/JKQTmathText/fonts/xits-bold.otf"); }
         //qDebug()<<QFontDatabase::applicationFontFamilies(i);
         if (QFile::exists(":/JKQTmathText/fonts/xits-bolditalic.otf")) { i=QFontDatabase::addApplicationFont(":/JKQTmathText/fonts/xits-bolditalic.otf"); }
@@ -3285,6 +3285,8 @@ void JKQTmathText::useXITS()
     //bool hasXITSMath=false;
     QString XITSMathfam;
     for (int i=0; i<fdb.families().size(); i++) {
+        //::cout<<fdb.families().at(i).simplified().toStdString()<<"\n";
+        //qDebug()<<fdb.families().at(i).simplified();
         if (fdb.families().at(i).contains("XITS Math")) {
             //hasXITSMath=true;
             XITSMathfam=fdb.families().at(i);

lib/jkqtplotter/jkqtpgeoelements.cpp

@@ -152,7 +152,9 @@ bool JKQTPgeoText::getYMinMax(double& miny, double& maxy, double& smallestGreate
 
 void JKQTPgeoText::draw(JKQTPEnhancedPainter& painter) {
     painter.save();
-
+#ifdef USE_XITS_FONTS
+    parent->get_mathText()->useXITS();
+#endif
     parent->get_mathText()->set_fontSize(fontSize*parent->get_fontSizeMultiplier());
     parent->get_mathText()->set_fontColor(color);
     parent->get_mathText()->parse(text);

test/jkqtplotter_simpletest_logaxes/README.md

@@ -41,29 +41,70 @@ Then a `JKQTPgeoText` is added to the graph, which shows the function plotted in
 ```c++
     // 4. Also we add a text-element in the plot to show the plotted function
     //    This element (JKQTPgeoText) is taken from the set of geometric elements
-    //    and is simply parametrized by a position (1.8/10) and the text to display.
+    //    and is simply parametrized by a position (1.25/10) and the text to display.
     //    In addition you can also set the font size (here to 15)
-    plot.addGraph(new JKQTPgeoText(&plot, 1.8, 10, "\\frac{A}{A_{stat}}=\\frac{1}{\\sqrt{\\left(1-\\eta^2\\right)^2+\\left(2{\\eta}D\\right)^2}}", 15));
-    // for nicer rendering we set the fonts used by the internal LaTeX parser instance to XITS
-    plot.get_plotter()->get_mathText()->useXITS();
+    //    Use '$...$' around the actual math string to ensure rendering with a math font
+    //    (the internal renderer uses XITS fonts by default, which are free and auto-distributed
+    //    and loaded in the library). If you don't use the math-mode modifiers, the default 
+    //    font of the other rendering text is used, which might not be suitable for
+    //    high-quality math rendering.
+    plot.addGraph(new JKQTPgeoText(&plot, 1.25, 10, "$\\frac{A}{A_{stat}}=\\frac{1}{\\sqrt{\\left(1-\\eta^2\\right)^2+\\left(2{\\eta}D\\right)^2}}$", 15));
 ```
+The difference between not using and using `$...$` for the equation can be seen below (left: no $-math-mode, right: using $-math-mode):
+![](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/jkqtplotter_simpletest_logaxes_lowqmathrendering.png)   ![](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/jkqtplotter_simpletest_logaxes_highqmathrendering.png)
 
 Finally the y-axis is switched to logarithmic scaling and the axis labels are set:
 ```c++
-    // 4. set y-axis to logarithmic (x-axis would be analogous)
-    //    and set axis labels (using LaTeX notation)
+// 5. set y-axis to logarithmic (x-axis would be analogous, but using `plot.get_xAxis()`)
     plot.get_yAxis()->set_logAxis(true);
-    plot.get_yAxis()->set_axisLabel("Amplitude A/A_{stat}");
-    plot.get_xAxis()->set_axisLabel("relative driving frequency \\eta=\\omega/\\omega_0");
+    //    now we set the number of label ticks to 9 (you give the count if minor between two majors,
+    //    so if you want ticks for 1,2,3,...,10,20,30,...,100... you need to use 9:
+    plot.get_yAxis()->set_minorTicks(9);
+    //    the minor grid is not shown by default. You can switch it on:
+    plot.get_yAxis()->set_drawMinorGrid(true);
+    //    usually axis ticks are shown as numbers 0.01, 0.1, 1, 10, ... You can also force the scientific
+    //    power-of-10 notation, using:
+    plot.get_yAxis()->set_labelType(JKQTPCALTexponent);
+    //    the number of digits in JKQTPCALTexponent determines which labels are drawn in standard-notation,
+    //    as compared to power-notation (e.g. if set to 1, the labels 0.1=10^{-1}, 1, 10 are shown in
+    //    standard notation, the rest in power-notation. This tweak improves readability)
+    plot.get_yAxis()->set_labelDigits(0);
+    // minor tick labels are usually not displayed, but you can switch them on, using
+    //plot.get_yAxis()->set_minorTickLabelsEnabled(true);
+    // the axis font sizes can be set with:
+    plot.get_yAxis()->set_tickLabelFontSize(10); // axis tick labels
+    plot.get_yAxis()->set_minorTickLabelFontSize(7); // minor axis tick labels
+    plot.get_yAxis()->set_labelFontSize(14); // axis label size
+    plot.get_xAxis()->set_tickLabelFontSize(10); // axis tick labels
+    plot.get_xAxis()->set_minorTickLabelFontSize(7); // minor axis tick labels
+    plot.get_xAxis()->set_labelFontSize(14); // axis label size
+    //    ... and finally set axis labels (using LaTeX notation and $...$ to improve rendering)
+    plot.get_yAxis()->set_axisLabel("Amplitude $A/A_{stat}$");
+    plot.get_xAxis()->set_axisLabel("relative driving frequency $\\eta=\\omega/\\omega_0$");
 ```
 
+As an alternative `JKQTPCALTexponentCharacter` does not use the power-of-10 notation, but uses the usual unit-characters, e.g. 0.001=1m, 0.000001=1µ, 10000=10k, ...
+
 The result looks like this:
 
-![jkqtplotter_simpletest_symbols_and_styles](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/jkqtplotter_simpletest_logaxes.png)
+![jkqtplotter_simpletest_logaxes](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/jkqtplotter_simpletest_logaxes.png)
 
 Without the logarithmic scaling we would have:
 
-![jkqtplotter_simpletest_symbols_and_styles](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/jkqtplotter_simpletest_logaxes_nolog.png)
+![jkqtplotter_simpletest_logaxes_nolog](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/jkqtplotter_simpletest_logaxes_nolog.png)
+
+Switching the minor grid off results in a plot like this:
+
+![jkqtplotter_simpletest_logaxes_nominorgrid](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/jkqtplotter_simpletest_logaxes_nominorgrid.png)
+
+These examples show the results for different typical values for `set_minorTicks()`:
+![logaxis_set_minorticks](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/logaxis_set_minorticks.png)
+
+These examples show the results for different typical values for `set_labelType()`:
+![logaxis_set_labelType](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/logaxis_set_labelType.png)
+
+These examples show the results for different typical values for `set_labelType()`:
+![logaxis_set_labelType](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/logaxis_set_labelType.png)
 
 
 [Back to JKQTPlotter main page](https://github.com/jkriege2/JKQtPlotter/)

test/jkqtplotter_simpletest_logaxes/jkqtplotter_simpletest_logaxes.cpp

@@ -49,7 +49,7 @@ int main(int argc, char* argv[])
         graph->set_lineWidth(1.5);
 
         // graph title is made from symbol+penstyle
-        graph->set_title(QString("D=\\delta/\\omega_0=%1").arg(D[id]));
+        graph->set_title(QString("$D=\\delta/\\omega_0=%1$").arg(D[id]));
 
         // add the graph to the plot, so it is actually displayed
         plot.addGraph(graph);
@@ -59,23 +59,47 @@ int main(int argc, char* argv[])
     //    This element (JKQTPgeoText) is taken from the set of geometric elements
     //    and is simply parametrized by a position (1.25/10) and the text to display.
     //    In addition you can also set the font size (here to 15)
-    plot.addGraph(new JKQTPgeoText(&plot, 1.25, 10, "\\frac{A}{A_{stat}}=\\frac{1}{\\sqrt{\\left(1-\\eta^2\\right)^2+\\left(2{\\eta}D\\right)^2}}", 15));
-    // for nicer rendering we set the fonts used by the internal LaTeX parser instance to XITS
-    //plot.get_plotter()->get_mathText()->useXITS();
+    //    Use '$...$' around the actual math string to ensure rendering with a math font
+    //    (the internal renderer uses XITS fonts by default, which are free and auto-distributed
+    //    and loaded in the library). If you don't use the math-mode modifiers, the default
+    //    font of the other rendering text is used, which might not be suitable for
+    //    high-quality math rendering.
+    plot.addGraph(new JKQTPgeoText(&plot, 1.25, 10, "$\\frac{A}{A_{stat}}=\\frac{1}{\\sqrt{\\left(1-\\eta^2\\right)^2+\\left(2{\\eta}D\\right)^2}}$", 15));
 
-    // 4. set y-axis to logarithmic (x-axis would be analogous)
-    //    and set axis labels (using LaTeX notation)
+    // 5. set y-axis to logarithmic (x-axis would be analogous, but using `plot.get_xAxis()`)
     plot.get_yAxis()->set_logAxis(true);
-    plot.get_yAxis()->set_axisLabel("Amplitude A/A_{stat}");
-    plot.get_xAxis()->set_axisLabel("relative driving frequency \\eta=\\omega/\\omega_0");
+    //    now we set the number of label ticks to 9 (you give the count if minor between two majors,
+    //    so if you want ticks for 1,2,3,...,10,20,30,...,100... you need to use 9:
+    plot.get_yAxis()->set_minorTicks(9);
+    //    the minor grid is not shown by default. You can switch it on:
+    plot.get_yAxis()->set_drawMinorGrid(true);
+    //    usually axis ticks are shown as numbers 0.01, 0.1, 1, 10, ... You can also force the scientific
+    //    power-of-10 notation, using:
+    plot.get_yAxis()->set_labelType(JKQTPCALTexponent);
+    //    the number of digits in JKQTPCALTexponent determines which labels are drawn in standard-notation,
+    //    as compared to power-notation (e.g. if set to 1, the labels 0.1=10^{-1}, 1, 10 are shown in
+    //    standard notation, the rest in power-notation. This tweak improves readability)
+    plot.get_yAxis()->set_labelDigits(0);
+    // minor tick labels are usually not displayed, but you can switch them on, using
+    //plot.get_yAxis()->set_minorTickLabelsEnabled(true);
+    // the axis font sizes can be set with:
+    plot.get_yAxis()->set_tickLabelFontSize(10); // axis tick labels
+    plot.get_yAxis()->set_minorTickLabelFontSize(7); // minor axis tick labels
+    plot.get_yAxis()->set_labelFontSize(14); // axis label size
+    plot.get_xAxis()->set_tickLabelFontSize(10); // axis tick labels
+    plot.get_xAxis()->set_minorTickLabelFontSize(7); // minor axis tick labels
+    plot.get_xAxis()->set_labelFontSize(14); // axis label size
+    //    ... and finally set axis labels (using LaTeX notation and $...$ to improve rendering)
+    plot.get_yAxis()->set_axisLabel("Amplitude $A/A_{stat}$");
+    plot.get_xAxis()->set_axisLabel("relative driving frequency $\\eta=\\omega/\\omega_0$");
 
 
-    // 5. autoscale the plot so the graph is contained
+    // 6. autoscale the plot so the graph is contained
     plot.zoomToFit();
 
-    // 6. show plotter and make it a decent size
+    // 7. show plotter and make it a decent size
     plot.show();
-    plot.resize(600,400);
+    plot.resize(700,500);
 
     return app.exec();
 }