From bf8fb4aa8589327737a706745734976a0b3705a0 Mon Sep 17 00:00:00 2001
From: Jordan Sherer <jordan@widefido.com>
Date: Thu, 7 May 2020 15:47:50 -0400
Subject: [PATCH] Smaller increment adjustment for drift. 1 second interval
 lines.

---
 mainwindow.cpp |  2 +-
 plotter.cpp    | 11 ++++++++++-
 plotter.h      |  3 ++-
 widegraph.cpp  |  4 ++--
 4 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/mainwindow.cpp b/mainwindow.cpp
index ffc9743..86d3298 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -4914,7 +4914,7 @@ void MainWindow::processDecodedLine(QByteArray t){
 
               n -= (float)period;
               n += computeFramesNeededForDecode(m)/RX_SAMPLE_RATE;
-              n -= xdt;
+              n -= xdt/2;
 
               int xdtmin = qMin(n*1000, (float)DriftingDateTime::drift());
               int xdtmax = qMax(n*1000, (float)DriftingDateTime::drift());
diff --git a/plotter.cpp b/plotter.cpp
index b2e44a7..f580585 100644
--- a/plotter.cpp
+++ b/plotter.cpp
@@ -281,7 +281,7 @@ void CPlotter::draw(float swide[], bool bScroll, bool bRed)
   m_bScaleOK=true;
 }
 
-void CPlotter::drawLine(const QColor &color, int ia, int ib)
+void CPlotter::drawDecodeLine(const QColor &color, int ia, int ib)
 {
   int x1=XfromFreq(ia);
   int x2=XfromFreq(ib);
@@ -295,6 +295,15 @@ void CPlotter::drawLine(const QColor &color, int ia, int ib)
   painter1.drawLine(qMax(x1, x2),0,qMax(x1, x2),9);
 }
 
+void CPlotter::drawHorizontalLine(const QColor &color, int x, int width)
+{
+  QPen pen0(color, 1);
+
+  QPainter painter1(&m_WaterfallPixmap);
+  painter1.setPen(pen0);
+  painter1.drawLine(x,0,width <= 0 ? m_w : x+width,0);
+}
+
 void CPlotter::replot()
 {
   float swide[m_w];
diff --git a/plotter.h b/plotter.h
index ced70fb..a3df2a6 100644
--- a/plotter.h
+++ b/plotter.h
@@ -90,7 +90,8 @@ public:
   void setReference(bool b) {m_bReference = b;}
   bool Reference() const {return m_bReference;}
 #endif
-  void drawLine(const QColor &color, int ia, int ib);
+  void drawDecodeLine(const QColor &color, int ia, int ib);
+  void drawHorizontalLine(const QColor &color, int x, int width);
   void setVHF(bool bVHF);
   void setRedFile(QString fRed);
   bool scaleOK () const {return m_bScaleOK;}
diff --git a/widegraph.cpp b/widegraph.cpp
index 2607fdf..71b69d4 100644
--- a/widegraph.cpp
+++ b/widegraph.cpp
@@ -246,7 +246,7 @@ void WideGraph::saveSettings()                                           //saveS
 
 void WideGraph::drawLine(const QColor &color, int ia, int ib)
 {
-  ui->widePlot->drawLine(color, ia, ib);
+  ui->widePlot->drawDecodeLine(color, ia, ib);
 }
 
 void WideGraph::dataSink2(float s[], float df3, int ihsym, int ndiskdata)  //dataSink2
@@ -357,7 +357,7 @@ void WideGraph::drawSwide(){
       }
       ui->widePlot->draw(swideLocal,true,false);
     } else if(lastSecondInPeriod != secondInPeriod) {
-      drawLine(Qt::gray, ui->widePlot->startFreq(), 10);
+      ui->widePlot->drawHorizontalLine(Qt::white, 0, 5);
     }
     lastSecondInPeriod=secondInPeriod;