Make the shininess of the Knob ring a little smarter

2 files changed, 35 insertions, 1 deletions

diff --git a/muse2/muse/widgets/knob.cpp b/muse2/muse/widgets/knob.cpp
index ae88e2f4..dc41e1c4 100644
--- a/muse2/muse/widgets/knob.cpp
+++ b/muse2/muse/widgets/knob.cpp
@@ -64,6 +64,9 @@ Knob::Knob(QWidget* parent, const char* name)
       d_markerColor   = palette().dark().color().darker(125);
       d_dotWidth      = 8;
 
+      l_slope = 0;
+      l_const = 100;
+
       setMinimumSize(30,30);
       setUpdateTime(50);
       }
@@ -94,6 +97,31 @@ void Knob::setTotalAngle (double angle)
       }
 
 //------------------------------------------------------------
+// Knob::setRange
+// Set the range and step size of the knob
+//
+// Sets the paramaters that define the shininess of the ring
+// surrounding the knob and then proceeds by passing the
+// parameters to the parent class' setRange() function.
+//------------------------------------------------------------
+
+void Knob::setRange(double vmin, double vmax, double vstep, int pagesize)
+      {
+      // divide by zero protection. probably too cautious
+      if (! (vmin == vmax || qMax(-vmin, vmax) == 0))
+            {
+            if (vmin * vmax < 0)
+                  l_slope = 80.0 / qMax(-vmin, vmax);
+            else
+                  {
+                  l_slope = 80.0 / (vmax - vmin);
+                  l_const = 100 - l_slope * vmin;
+                  }
+            }
+      SliderBase::setRange(vmin, vmax, vstep, pagesize);
+      }
+
+//------------------------------------------------------------
 //   QwtKnob::drawKnob
 //    const QRect &r --   borders of the knob
 //------------------------------------------------------------
@@ -132,7 +160,8 @@ void Knob::drawKnob(QPainter* p, const QRect& r)
     
       QPen pn;
       pn.setCapStyle(Qt::FlatCap);
-      pn.setColor(d_shinyColor.lighter(100+ abs(d_angle*100)/300));
+
+      pn.setColor(d_shinyColor.lighter(l_const + abs(value() * l_slope)));
       pn.setWidth(d_shineWidth * 2);
       p->setPen(pn);
       p->drawArc(aRect, 0, 360 * 16);
diff --git a/muse2/muse/widgets/knob.h b/muse2/muse/widgets/knob.h
index 09e13c93..2a553c4e 100644
--- a/muse2/muse/widgets/knob.h
+++ b/muse2/muse/widgets/knob.h
@@ -36,6 +36,9 @@ class Knob : public SliderBase, public ScaleIf
       double d_totalAngle;
       double d_nTurns;
 
+      double l_const;
+      double l_slope;
+
       QRect  kRect;
       bool _faceColSel;
       QColor d_faceColor;
@@ -62,6 +65,8 @@ class Knob : public SliderBase, public ScaleIf
       Knob(QWidget* parent = 0, const char *name = 0);
       ~Knob() {}
 
+      void setRange(double vmin, double vmax, double vstep = 0.0,
+		    int pagesize = 1);
       void setKnobWidth(int w);
       void setTotalAngle (double angle);
       void setBorderWidth(int bw);