From a7831a7ccab1ec0537bfb520b72b4eb0efa84e3b Mon Sep 17 00:00:00 2001
From: dave <dave.french3@googlemail.com>
Date: Thu, 11 Dec 2014 16:52:06 +0000
Subject: [PATCH] Draw grid lines on widget

---
 plugins/eq/eqparameterwidget.cpp | 25 ++++++++++++++++++++++---
 plugins/eq/eqparameterwidget.h   |  2 ++
 plugins/eq/eqspectrumview.h      |  8 ++++++--
 3 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/plugins/eq/eqparameterwidget.cpp b/plugins/eq/eqparameterwidget.cpp
index 39e1ab94f..f1d53fa2e 100644
--- a/plugins/eq/eqparameterwidget.cpp
+++ b/plugins/eq/eqparameterwidget.cpp
@@ -44,6 +44,7 @@ EqParameterWidget::EqParameterWidget( QWidget *parent ) :
     m_pixelsPerUnitHeight = (height() - 4) / ( totalHeight );
     m_scale = 1.5;
     m_pixelsPerOctave = freqToXPixel( 10000 ) - freqToXPixel( 5000 );
+
 }
 
 
@@ -59,9 +60,27 @@ EqParameterWidget::~EqParameterWidget()
 
 void EqParameterWidget::paintEvent( QPaintEvent *event )
 {
-    QPainter painter( this );
+	QPainter painter( this );
+	//Draw Frequecy maker lines
+	painter.setPen( QPen( QColor( 100, 100, 100, 200 ), 1, Qt::SolidLine, Qt::RoundCap, Qt::BevelJoin ) );
+	for( int x = 20 ; x < 100; x += 10)
+	{
+		painter.drawLine( freqToXPixel( x )  , 0, freqToXPixel( x ) , height() );
+	}
+	for( int x = 100 ; x < 1000; x += 100)
+	{
+		painter.drawLine( freqToXPixel( x )  , 0, freqToXPixel( x ) , height() );
+	}
+	for( int x = 1000 ; x < 11000; x += 1000)
+	{
+		painter.drawLine( freqToXPixel( x )  , 0, freqToXPixel( x ) , height() );
+	}
+	//draw 0dB line
+	painter.drawLine(0, gainToYPixel( 0 ) , width(), gainToYPixel( 0 ) );
+
     for( int i = 0 ; i < bandCount() ; i++ )
     {
+
         m_bands[i].color.setAlpha(m_bands[i].active->value() ? activeAplha() : inactiveAlpha());
 		painter.setPen( QPen( m_bands[i].color, 10, Qt::SolidLine, Qt::RoundCap, Qt::BevelJoin ) );
         float  x = freqToXPixel( m_bands[i].freq->value() );
@@ -71,11 +90,11 @@ void EqParameterWidget::paintEvent( QPaintEvent *event )
         {
             gain = m_bands[i].gain->value();
         }
-        y = gainToYPixel( gain ) + 3;
+		y = gainToYPixel( gain );
         float bw = m_bands[i].freq->value() / m_bands[i].res->value();
         m_bands[i].x = x; m_bands[i].y = y;
         painter.drawPoint( x, y );
-		painter.setPen( QPen( m_bands[i].color, 3, Qt::SolidLine, Qt::RoundCap, Qt::BevelJoin ) );
+		painter.setPen( QPen( m_bands[i].color, 3, Qt::SolidLine, Qt::SquareCap, Qt::BevelJoin ) );
         if(i == 0 || i == bandCount() - 1 ){
             painter.drawLine(x, y, x, y - (m_bands[i].res->value() * 4  ) );
         }
diff --git a/plugins/eq/eqparameterwidget.h b/plugins/eq/eqparameterwidget.h
index cb14154b3..766efad60 100644
--- a/plugins/eq/eqparameterwidget.h
+++ b/plugins/eq/eqparameterwidget.h
@@ -122,6 +122,8 @@ private:
 
     enum MouseAction { none, drag, res } m_mouseAction;
     int m_oldX, m_oldY;
+	int *m_xGridBands;
+
 
     inline int freqToXPixel( float freq )
     {
diff --git a/plugins/eq/eqspectrumview.h b/plugins/eq/eqspectrumview.h
index ca63ff27d..47490afa3 100644
--- a/plugins/eq/eqspectrumview.h
+++ b/plugins/eq/eqspectrumview.h
@@ -63,9 +63,15 @@ public:
 	int m_lastY;
 	virtual void paintEvent( QPaintEvent* event )
 	{
+		const int fh = height();
+		const int LOWER_Y = -96;	// dB
 		int m_lastY = height();
 		QPainter p( this );
 		p.setPen( QPen( color, 1, Qt::SolidLine, Qt::RoundCap, Qt::BevelJoin ) );
+		//draw grid lines
+		int y33 = (int)( fh * 2.0 / 3.0 * (20*(log10( 0.33 ) ) - LOWER_Y ) / (-LOWER_Y ) );
+		p.drawLine(0, y33, width(), y33);
+
 		const float e =  m_sa->m_energy;
 		if( e <= 0 )
 		{
@@ -73,9 +79,7 @@ public:
 			return;
 		}
 		float * b = m_sa->m_bands;
-		const int LOWER_Y = -60;	// dB
 		int h;
-		const int fh = height();
 		bool linX = true;
 		if( linX )
 		{