Prepare for three channels STF

stfslider.cpp

@@ -10,18 +10,34 @@ static float clamp(float x)
     return std::min(std::max(x, 0.0f), 1.0f);
 }
 
-STFSlider::STFSlider(QWidget *parent) : QWidget(parent)
+STFSlider::STFSlider(const QColor &color, QWidget *parent) : QWidget(parent)
 {
     setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
     setMinimumWidth(100);
-    setMinimumHeight(15);
-    setMaximumHeight(15);
     setMouseTracking(true);
+
+    if(color == Qt::white)
+    {
+        setMaximumHeight(15);
+        setMinimumHeight(15);
+    }
+    else
+    {
+        setMaximumHeight(7);
+        setMinimumHeight(7);
+    }
     m_blackPoint = 0;
     m_midPoint = 0.5;
     m_whitePoint = 1;
     m_grabbed = -1;
     m_fineTune = false;
+    m_color = color;
+    if(color == Qt::blue || color == Qt::red)
+        m_threshold = 1.1f;
+    else if(color == Qt::green)
+        m_threshold = 0.8f;
+    else
+        m_threshold = 0.4f;
     setToolTip(tr("Press Shift for fine tuning"));
 }
 
@@ -60,7 +76,7 @@ void STFSlider::paintEvent(QPaintEvent *event)
     {
         qreal p = i/32.0f;
         qreal c = std::pow(p, 1.0/2.2)*255;
-        gradient.setColorAt(p, QColor(c, c, c));
+        gradient.setColorAt(p, QColor(m_color.redF()*c, m_color.greenF()*c, m_color.blueF()*c));
     }
 
     QPainterPath tick(QPointF(0, 0));
@@ -75,7 +91,7 @@ void STFSlider::paintEvent(QPaintEvent *event)
 
     auto drawTick = [&](qreal p)
     {
-        painter.setPen(p < 0.4 ? Qt::white : Qt::black);
+        painter.setPen(p < m_threshold ? Qt::white : Qt::black);
         painter.resetTransform();
         painter.translate(w*p, 0);
         painter.drawPath(tick);