Improved dark part colour gradients. Added gGradientFromQColor() in widgets/utils.cpp

 called from PartCanvas draw.

4 files changed, 44 insertions, 9 deletions

diff --git a/muse2/ChangeLog b/muse2/ChangeLog
index b3e18e71..9d5e7237 100644
--- a/muse2/ChangeLog
+++ b/muse2/ChangeLog
@@ -5,6 +5,7 @@
         - Removed DSSI gui QProcess kill timers. In Qt4 they can only be used that way with threads started with QThread. 
           Kill is not nice anyway. On terminate, gui may prompt user to save work etc. App should check at close 
            if all these guis closed and ask to abort closing, or kill the guis, or leave them alone.
+        - Improved dark part colour gradients. Added gGradientFromQColor() in widgets/utils.cpp and called from PartCanvas draw.
 12.04.2011:
         - Another fix for FLAM GUI controls - 300ms delay before sending control values in PluginI::oscUpdate(). (Tim)
           Good enough? How to make sure (any) gui is really ready?
diff --git a/muse2/muse/arranger/pcanvas.cpp b/muse2/muse/arranger/pcanvas.cpp
index 4fc0c3dd..ca2a16b0 100644
--- a/muse2/muse/arranger/pcanvas.cpp
+++ b/muse2/muse/arranger/pcanvas.cpp
@@ -20,7 +20,7 @@
 #include <QPainter>
 #include <QUrl>
 #include <QPoint>
-#include <QLinearGradient>
+//#include <QLinearGradient>
 
 #include "fastlog.h"
 #include "widgets/tools.h"
@@ -40,6 +40,7 @@
 #include "mpevent.h"
 #include "midievent.h"
 #include "midi.h"
+#include "utils.h"
 
 // Moved into global config by Tim.
 /* 
@@ -1552,10 +1553,18 @@ void PartCanvas::drawItem(QPainter& p, const CItem* item, const QRect& rect)
             // Hm, put some kind of lower limit? If so do that globally to the adjustment.
             QColor c(Qt::black);
             c.setAlpha(config.globalAlphaBlend);
+            
             QLinearGradient gradient(r.topLeft(), r.bottomLeft());
-            gradient.setColorAt(0, c);
-            gradient.setColorAt(1, c.darker());
+            //gradient.setColorAt(0, c);
+            //gradient.setColorAt(1, c.darker());
+            // Use a colour only about 20% lighter than black, rather than the 50% we use in gGradientFromQColor
+            //  and is used in darker()/lighter(), so that it is distinguished a bit better from grey non-part tracks.
+            //c.setRgba(64, 64, 64, c.alpha());        
+            gradient.setColorAt(0, QColor(51, 51, 51, config.globalAlphaBlend));
+            gradient.setColorAt(1, c);
             QBrush cc(gradient);
+            //QBrush cc(gGradientFromQColor(c, r.topLeft(), r.bottomLeft()));
+            
             p.setBrush(cc);
             p.drawRect(r);
             }
@@ -1570,10 +1579,11 @@ void PartCanvas::drawItem(QPainter& p, const CItem* item, const QRect& rect)
             p.setPen(pen);
             QColor c(config.partColors[i]);
             c.setAlpha(config.globalAlphaBlend);
-            QLinearGradient gradient(r.topLeft(), r.bottomLeft());
-            gradient.setColorAt(0, c);
-            gradient.setColorAt(1, c.darker());
-            QBrush cc(gradient);
+            //QLinearGradient gradient(r.topLeft(), r.bottomLeft());
+            //gradient.setColorAt(0, c);
+            //gradient.setColorAt(1, c.darker());
+            //QBrush cc(gradient);
+            QBrush cc(gGradientFromQColor(c, r.topLeft(), r.bottomLeft()));
             p.setBrush(cc);
 
             p.drawRect(r);
@@ -1616,8 +1626,7 @@ void PartCanvas::drawItem(QPainter& p, const CItem* item, const QRect& rect)
               p.setPen(Qt::black);   
             else
               p.setPen(Qt::white); 
-            p.drawText(rr, Qt::AlignTop|Qt::AlignLeft, part->name());
-            rr.translate(1,1);
+            p.drawText(rr.translated(1, 1), Qt::AlignTop|Qt::AlignLeft, part->name());
             if (rev)
               p.setPen(Qt::white);   
             else
diff --git a/muse2/muse/widgets/utils.cpp b/muse2/muse/widgets/utils.cpp
index 1bf4ca64..693f3c36 100644
--- a/muse2/muse/widgets/utils.cpp
+++ b/muse2/muse/widgets/utils.cpp
@@ -11,6 +11,10 @@
 #include <sys/time.h>
 
 #include <QFrame>
+#include <QColor>
+#include <QGradient>
+#include <QLinearGradient>
+#include <QPointF>
 
 #include "utils.h"
 
@@ -354,3 +358,19 @@ bool autoAdjustFontSize(QFrame* w, const QString& s, bool ignoreWidth, bool igno
   
   return true;  
 }
+
+QGradient gGradientFromQColor(const QColor& c, const QPointF& start, const QPointF& finalStop)
+{
+  int h = c.hsvHue(), s = c.hsvSaturation(), a = c.alpha();
+  int cv = c.value();
+  int v0 = cv + (255 - cv)/2;
+  int v1 = cv - cv/2;
+  QColor c0 = QColor::fromHsv(h, s, v0, a); 
+  QColor c1 = QColor::fromHsv(h, s, v1, a); 
+  
+  QLinearGradient gradient(start, finalStop);
+  gradient.setColorAt(0, c0);
+  gradient.setColorAt(1, c1);
+  
+  return gradient;
+}
\ No newline at end of file
diff --git a/muse2/muse/widgets/utils.h b/muse2/muse/widgets/utils.h
index 654a7834..b6997023 100644
--- a/muse2/muse/widgets/utils.h
+++ b/muse2/muse/widgets/utils.h
@@ -11,6 +11,10 @@
 class QFrame;
 class QString;
 class QWidget;
+class QGradient;
+class QCanvas;
+class QPointF;
+class QColor;
 
 
 extern QString bitmap2String(int bm);
@@ -18,6 +22,7 @@ extern int string2bitmap(const QString& str);
 extern QString u32bitmap2String(unsigned int bm);
 extern unsigned int string2u32bitmap(const QString& str);
 extern bool autoAdjustFontSize(QFrame* w, const QString& s, bool ignoreWidth = false, bool ignoreHeight = false, int max = 10, int min = 4);
+extern QGradient gGradientFromQColor(const QColor& c, const QPointF& start, const QPointF& finalStop);
 
 extern int num2cols(int min, int max);
 extern QFrame* hLine(QWidget* parent);