From e1d3a756ccc197ab443358a9de33c2e013c85052 Mon Sep 17 00:00:00 2001
From: Fred Gleason <fredg@paravelsystems.com>
Date: Mon, 22 Mar 2021 11:05:19 -0400
Subject: [PATCH] 2021-03-22 Fred Gleason <fredg@paravelsystems.com> 	*
 Implemented movable reference lines for 'Cut Gain' adjustments 	in
 'RDMarkerDialog'.

Signed-off-by: Fred Gleason <fredg@paravelsystems.com>
---
 ChangeLog             |  3 +++
 lib/rdmarkerview.cpp  | 33 +++++++++++++++++++++++++++++++--
 lib/rdmarkerview.h    |  2 ++
 lib/rdwavefactory.cpp |  6 ++++--
 4 files changed, 40 insertions(+), 4 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 6537e6a5..e760d38e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -21327,3 +21327,6 @@
 2021-03-21 Fred Gleason <fredg@paravelsystems.com>
 	* Fixed a bug in 'RDMarkerPlayer' that would cause the play cursor
 	position to fail to be properly initialized when opening a new cut.
+2021-03-22 Fred Gleason <fredg@paravelsystems.com>
+	* Implemented movable reference lines for 'Cut Gain' adjustments
+	in 'RDMarkerDialog'.
diff --git a/lib/rdmarkerview.cpp b/lib/rdmarkerview.cpp
index 91c64e1e..71327551 100644
--- a/lib/rdmarkerview.cpp
+++ b/lib/rdmarkerview.cpp
@@ -569,8 +569,11 @@ void RDMarkerView::setNoSegueFade(bool state)
 
 void RDMarkerView::setPlayGain(int db)
 {
-  d_has_unsaved_changes=db!=d_play_gain;
-  d_play_gain=db;
+  if(db!=d_play_gain) {
+    d_play_gain=db;
+    d_has_unsaved_changes=true;
+    SetReferenceLines();
+  }
 }
 
 
@@ -1100,6 +1103,18 @@ void RDMarkerView::WriteWave()
   d_scene->addRect(LEFT_MARGIN+wavemap.width(),0,d_pad_size,d_height-20,QPen(Qt::gray),QBrush(Qt::gray));
   d_right_margin=LEFT_MARGIN+wavemap.width();
 
+  //
+  // Reference Level Lines
+  //
+  for(unsigned i=0;i<d_channels;i++) {
+    for(unsigned j=0;j<2;j++) {
+      d_reference_line_items[i][j]=new QGraphicsLineItem(0,0,d_right_margin,0);
+      d_reference_line_items[i][j]->setPen(QPen(Qt::red));
+      d_scene->addItem(d_reference_line_items[i][j]);
+    }
+  }
+  SetReferenceLines();
+
   //
   // Markers
   //
@@ -1174,3 +1189,17 @@ void RDMarkerView::RemoveMarker(RDMarkerHandle::PointerRole role)
 
   emit pointerValueChanged(role,-1);
 }
+
+
+void RDMarkerView::SetReferenceLines()
+{
+  int sh=d_scene->height();
+  double ratio=exp10((double)(d_audio_gain-100*d_play_gain)/2000.0);
+  int ref_line=exp10((double)(-REFERENCE_LEVEL)/2000.00)*sh*ratio/
+    ((double)d_channels*2.0);
+  for(unsigned i=0;i<d_channels;i++) {
+    int zero_line=sh/(d_channels*2)+i*sh/(d_channels);
+    d_reference_line_items[i][0]->setPos(0,zero_line+ref_line);
+    d_reference_line_items[i][1]->setPos(0,zero_line-ref_line);
+  }
+}
diff --git a/lib/rdmarkerview.h b/lib/rdmarkerview.h
index 17339d2e..d845f9ba 100644
--- a/lib/rdmarkerview.h
+++ b/lib/rdmarkerview.h
@@ -145,6 +145,7 @@ class RDMarkerView : public QWidget
   void DrawMarker(RDMarkerHandle::PointerType type,
 		  RDMarkerHandle::PointerRole role,int handle_pos);
   void RemoveMarker(RDMarkerHandle::PointerRole role);
+  void SetReferenceLines();
   QGraphicsView *d_view;
   QGraphicsScene *d_scene;
   unsigned d_cart_number;
@@ -180,6 +181,7 @@ class RDMarkerView : public QWidget
   bool d_marker_menu_used;
   RDMarkerHandle::PointerRole d_selected_markers[2];
   int d_wheel_angle;
+  QGraphicsLineItem *d_reference_line_items[2][2];
 };
 
 
diff --git a/lib/rdwavefactory.cpp b/lib/rdwavefactory.cpp
index fcbd2cd4..05a2fd6e 100644
--- a/lib/rdwavefactory.cpp
+++ b/lib/rdwavefactory.cpp
@@ -96,12 +96,13 @@ QPixmap RDWaveFactory::generate(int height,int x_shrink,int gain,
   // Waveform
   //
   p->setPen(Qt::black);
-  int ref_line=exp10((double)(-REFERENCE_LEVEL)/2000.00)*height*ratio/
-    ((double)d_energy_channels*2.0);
+  //  int ref_line=exp10((double)(-REFERENCE_LEVEL)/2000.00)*height*ratio/
+  //    ((double)d_energy_channels*2.0);
   int clip_line=height/(2*d_energy_channels);
   for(unsigned i=0;i<d_energy_channels;i++) {
     int zero_line=height/(d_energy_channels*2)+i*height/(d_energy_channels);
     if(incl_scale) {
+      /*
       if(ref_line<clip_line) {
 	p->setPen(Qt::red);
 	p->drawLine(0,zero_line+ref_line,
@@ -110,6 +111,7 @@ QPixmap RDWaveFactory::generate(int height,int x_shrink,int gain,
 		    d_energy.size()/x_shrink,zero_line-ref_line);
 	p->setPen(Qt::black);
       }
+      */
     }
     p->drawLine(0,zero_line,d_energy.size()/x_shrink,zero_line);
     for(int j=i;j<d_energy.size();j+=(d_energy_channels*x_shrink)) {