sip, doc, bad keywords

python/core/auto_generated/symbology/qgsgraduatedsymbolrenderer.sip.in

@@ -279,6 +279,30 @@ Returns if we want to have a central class astride the pivot value
 Set if we want a central class astride the pivot value
 
 .. versionadded:: 3.4
+%End
+
+    static void makeBreaksSymmetric( QList<double> &breaks, double symmetryPoint, bool astride );
+%Docstring
+Remove the breaks that are above the existing opposite sign classes to keep colors symmetrically balanced around symmetryPoint
+Does not put a break on the symmetryPoint. This is done before.
+
+:param breaks: The breaks of an already-done classification
+:param symmetryPoint: The point around which we want a symmetry
+:param astride: A bool indicating if the symmetry is made astride the symmetryPoint or not ( [-1,1] vs. [-1,0][0,1] )
+
+.. versionadded:: 3.4
+%End
+
+    static QList<double> calcEqualIntervalBreaks( double minimum, double maximum, int classes, bool useSymmetricMode, double symmetryPoint, bool astride );
+%Docstring
+Compute the equal interval classification
+
+:param minimum: The minimum value of the distribution
+:param maximum: The maximum value of the distribution
+:param classes: The number of classes desired
+:param useSymmetricMode: A bool indicating if we want to have classes and hence colors ramp symmetric around a value
+:param symmetryPoint: The point around which we want a symmetry
+:param astride: A bool indicating if the symmetry is made astride the symmetryPoint or not ( [-1,1] vs. [-1,0][0,1] )
 %End
 
     void updateClasses( QgsVectorLayer *vlayer, Mode mode, int nclasses, bool useSymmetricMode = false, double symmetryPoint = 0.0, bool astride = false );

src/core/symbology/qgsgraduatedsymbolrenderer.cpp

@@ -538,16 +538,17 @@ void QgsGraduatedSymbolRenderer::makeBreaksSymmetric( QList<double> &breaks, dou
 
   if ( breaks.size() > 1 ) //to avoid crash when only 1 class
   {
-    qSort( breaks.begin(), breaks.end() );
+    std::sort( breaks.begin(), breaks.end() );
     // breaks contain the maximum of the distrib but not the minimum
-    double distBelowSymmetricValue = qAbs( breaks[0] - symmetryPoint );
-    double distAboveSymmetricValue = qAbs( breaks[ breaks.size() - 2 ] - symmetryPoint ) ;
-    double absMin = qMin( qAbs( distAboveSymmetricValue ), qAbs( distBelowSymmetricValue ) );
+    double distBelowSymmetricValue = std::fabs( breaks[0] - symmetryPoint );
+    double distAboveSymmetricValue = std::fabs( breaks[ breaks.size() - 2 ] - symmetryPoint ) ;
+    double absMin = std::min( distAboveSymmetricValue, distBelowSymmetricValue );
 
     // make symmetric
     for ( int i = 0; i <= breaks.size() - 2; ++i )
     {
-      if ( qAbs( breaks.at( i ) - symmetryPoint ) >= ( absMin - qAbs( breaks[0] - breaks[1] ) / 100. ) )
+      // part after "absMin" is for doubles rounding issues
+      if ( std::fabs( breaks.at( i ) - symmetryPoint ) >= ( absMin - std::fabs( breaks[0] - breaks[1] ) / 100. ) )
       {
         breaks.removeAt( i );
         --i;

src/core/symbology/qgsgraduatedsymbolrenderer.h

@@ -272,11 +272,23 @@ class CORE_EXPORT QgsGraduatedSymbolRenderer : public QgsFeatureRenderer
 
     /**
      * Remove the breaks that are above the existing opposite sign classes to keep colors symmetrically balanced around symmetryPoint
-     * Does not put a break on the symmetryPoint
+     * Does not put a break on the symmetryPoint. This is done before.
+     * \param breaks The breaks of an already-done classification
+     * \param symmetryPoint The point around which we want a symmetry
+     * \param astride A bool indicating if the symmetry is made astride the symmetryPoint or not ( [-1,1] vs. [-1,0][0,1] )
      * \since QGIS 3.4
      */
     static void makeBreaksSymmetric( QList<double> &breaks, double symmetryPoint, bool astride );
 
+    /**
+     * Compute the equal interval classification
+     * \param minimum The minimum value of the distribution
+     * \param maximum The maximum value of the distribution
+     * \param classes The number of classes desired
+     * \param useSymmetricMode A bool indicating if we want to have classes and hence colors ramp symmetric around a value
+     * \param symmetryPoint The point around which we want a symmetry
+     * \param astride A bool indicating if the symmetry is made astride the symmetryPoint or not ( [-1,1] vs. [-1,0][0,1] )
+     */
     static QList<double> calcEqualIntervalBreaks( double minimum, double maximum, int classes, bool useSymmetricMode, double symmetryPoint, bool astride );
 
     /**