From afaee94f7ddc4bd23286e54ea3c407ee5627ef7d Mon Sep 17 00:00:00 2001
From: jkriege2 <jan@jkrieger.de>
Date: Sat, 26 Jan 2019 12:35:57 +0100
Subject: [PATCH] JKQTPSingleColumnSymbolsGraph now uses fixed seed-value for
 random scattering plot

---
 .../jkqtpgraphssinglecolumnsymbols.cpp        | 23 ++++---------------
 .../jkqtpgraphssinglecolumnsymbols.h          | 13 +++++++++++
 2 files changed, 17 insertions(+), 19 deletions(-)

diff --git a/lib/jkqtplotter/jkqtpgraphssinglecolumnsymbols.cpp b/lib/jkqtplotter/jkqtpgraphssinglecolumnsymbols.cpp
index fd804c8dfe..85397dc1a6 100644
--- a/lib/jkqtplotter/jkqtpgraphssinglecolumnsymbols.cpp
+++ b/lib/jkqtplotter/jkqtpgraphssinglecolumnsymbols.cpp
@@ -36,7 +36,7 @@
 
 
 JKQTPSingleColumnSymbolsGraph::JKQTPSingleColumnSymbolsGraph(JKQTBasePlotter *parent):
-    JKQTPSingleColumnGraph(parent)
+    JKQTPSingleColumnGraph(parent), seedValue(123456)
 {
     color=QColor("red");
     style=Qt::SolidLine;
@@ -60,25 +60,9 @@ JKQTPSingleColumnSymbolsGraph::JKQTPSingleColumnSymbolsGraph(JKQTBasePlotter *pa
 
 
 JKQTPSingleColumnSymbolsGraph::JKQTPSingleColumnSymbolsGraph(JKQTPlotter *parent):
-    JKQTPSingleColumnGraph(parent)
+    JKQTPSingleColumnSymbolsGraph(parent->getPlotter())
 {
-    color=QColor("red");
-    style=Qt::SolidLine;
-    lineWidth=2;
-    parentPlotStyle=-1;
-    symbolSize=12;
-    symbolWidth=1;
-    symbol=JKQTPNoSymbol;
-    dataDirection=DataDirection::Y;
-    position=0;
 
-    if (parent) { // get style settings from parent object
-        parentPlotStyle=parent->getNextStyle();
-        //std::cout<<"got style settings from parent: "<<parentPlotStyle<<std::endl;
-        color=parent->getPlotStyle(parentPlotStyle).color();
-        style=parent->getPlotStyle(parentPlotStyle).style();
-    }
-    fillColor=color;
 }
 
 
@@ -146,7 +130,8 @@ void JKQTPSingleColumnSymbolsGraph::draw(JKQTPEnhancedPainter &painter)
     if (imax<0) imax=0;
 
     std::random_device rd; // random number generators:
-    std::mt19937 gen{rd()};
+    std::minstd_rand gen{rd()};
+    gen.seed(seedValue);
     std::uniform_real_distribution<> dRandomScatter{position-width/2.0, position+width/2.0};
 
     const double symSize=parent->pt2px(painter, symbolSize);
diff --git a/lib/jkqtplotter/jkqtpgraphssinglecolumnsymbols.h b/lib/jkqtplotter/jkqtpgraphssinglecolumnsymbols.h
index 005f1f55b5..cb4e13e8d2 100644
--- a/lib/jkqtplotter/jkqtpgraphssinglecolumnsymbols.h
+++ b/lib/jkqtplotter/jkqtpgraphssinglecolumnsymbols.h
@@ -199,6 +199,14 @@ class LIB_EXPORT JKQTPSingleColumnSymbolsGraph: public JKQTPSingleColumnGraph {
         {
             return this->symbolSize;
         }
+        /** \copydoc seedValue */
+        inline void setSeedValue(unsigned int val) {
+            seedValue=val;
+        }
+        /** \copydoc seedValue */
+        inline unsigned int getSeedValue() const {
+            return seedValue;
+        }
     protected:
         /** \brief interpret the data from dataColumn either as X- or Y-data */
         DataDirection dataDirection;
@@ -216,6 +224,11 @@ class LIB_EXPORT JKQTPSingleColumnSymbolsGraph: public JKQTPSingleColumnGraph {
         double symbolSize;
         /** \brief width (in pt) of the lines used to plot the symbol for the data points */
         double symbolWidth;
+        /** \brief seed value for the pseudo-random number generator used for drawing.
+         *
+         * This seed is used instead of e.g. the system time to ensure that replotting results in the
+         * same plot every time. ou can set the seed using setSeedvalue() ) */
+        unsigned int seedValue;
 
         QPen getSymbolPen(JKQTPEnhancedPainter& painter) const;
         QBrush getBrush(JKQTPEnhancedPainter &painter) const;