Added rotation of waterfall plot.

src/gui/waterfallview.cc

@@ -73,10 +73,11 @@ LinearColorMap::map(const double &value) {
 /* ****************************************************************************************** *
  *  Implementation of WaterFallView
  * ****************************************************************************************** */
-WaterFallView::WaterFallView(SpectrumProvider *spectrum, size_t height, QWidget *parent)
+WaterFallView::WaterFallView(SpectrumProvider *spectrum, size_t hist, Direction dir, QWidget *parent)
-  : QWidget(parent), _spectrum(spectrum), _N(_spectrum->fftSize()), _M(height), _waterfall(_N,_M)
+  : QWidget(parent), _spectrum(spectrum), _N(_spectrum->fftSize()), _M(hist), _dir(dir),
+    _waterfall(_N,_M)
 {
-  setMinimumHeight(height);
+  setMinimumHeight(hist);
   // Fill waterfall pixmap
   _waterfall.fill(Qt::black);
   // Create color map
@@ -93,6 +94,7 @@ WaterFallView::WaterFallView(SpectrumProvider *spectrum, size_t height, QWidget
 void
 WaterFallView::_onSpectrumUpdated() {
   if (_waterfall.isNull() || (_M==0) || (_N==0)) { return; }
+
   QPainter painter(&_waterfall);
   // scroll pixmap one pixel up
   QRect target(0,0, _N, _M-1), source(0,1,_N,_M-1);
@@ -131,8 +133,29 @@ void
 WaterFallView::paintEvent(QPaintEvent *evt) {
   QPainter painter(this);
   painter.save();
-  // Draw scaled pixmap
+
-  painter.drawPixmap(evt->rect(), _waterfall.scaled(this->width(), this->height()), evt->rect());
+  // Draw transformed pixmap
+  QTransform trafo;
+  switch (_dir) {
+  case BOTTOM_UP:
+    trafo.scale(this->width()/qreal(_N), this->height()/qreal(_M));
+    break;
+  case LEFT_RIGHT:
+    trafo.rotate(90);
+    trafo.scale(this->width()/qreal(_M), this->height()/qreal(_N));
+    break;
+  case TOP_DOWN:
+    trafo.rotate(180);
+    trafo.scale(this->width()/qreal(_N), this->height()/qreal(_M));
+    break;
+  case RIGHT_LEFT:
+    trafo.rotate(270);
+    trafo.scale(this->width()/qreal(_M), this->height()/qreal(_N));
+    break;
+  }
+  painter.setTransform(trafo);
+
+  painter.drawPixmap(evt->rect(), _waterfall, evt->rect());
   painter.restore();
 }
 

src/gui/waterfallview.hh

@@ -70,12 +70,17 @@ class WaterFallView : public QWidget
 {
   Q_OBJECT
 
+public:
+  typedef enum {
+    BOTTOM_UP, TOP_DOWN, LEFT_RIGHT, RIGHT_LEFT
+  } Direction;
+
 public:
   /** Constructor.
    * @param spectrum Specifies the spectrum sink.
-   * @param height Specifies the number of PSDs to display.
+   * @param hist Specifies the number of PSDs to display.
    * @param parent The parent widget. */
-  explicit WaterFallView(SpectrumProvider *spectrum, size_t height=100, QWidget *parent = 0);
+  explicit WaterFallView(SpectrumProvider *spectrum, size_t hist=100, Direction dir=BOTTOM_UP, QWidget *parent = 0);
 
 signals:
   void click(double f);
@@ -98,6 +103,8 @@ protected:
   size_t _N;
   /** "Height of the spectrum. */
   size_t _M;
+  /** Specifies the direction of the waterfall. */
+  Direction _dir;
   /** The waterfall spectrogram. */
   QPixmap _waterfall;
   /** The color map to be used. */