comparison layer/SpectrogramLayer.cpp @ 77:fd348f36c0d3

* Implement harmonic cursor in spectrogram
* Implement layer export.  This doesn't quite do the right thing for the SV
  XML layer export yet -- it doesn't include layer display information, so
  when imported, it only creates an invisible model.  Could also do with
  fixing CSV file import so as to work correctly for note and text layers.

 
 	default:
 	case DefaultColours:
 	    hue = 256 - pixel;
 	    colour = QColor::fromHsv(hue, pixel/2 + 128, pixel);
+            m_crosshairColour = QColor(255, 150, 50);
+//            m_crosshairColour = QColor::fromHsv(240, 160, 255);
 	    break;
 
 	case WhiteOnBlack:
 	    colour = QColor(pixel, pixel, pixel);
+            m_crosshairColour = Qt::red;
 	    break;
 
 	case BlackOnWhite:
 	    colour = QColor(256-pixel, 256-pixel, 256-pixel);
+            m_crosshairColour = Qt::darkGreen;
 	    break;
 
 	case RedOnBlue:
 	    colour = QColor(pixel > 128 ? (pixel - 128) * 2 : 0, 0,
 			    pixel < 128 ? pixel : (256 - pixel));
+            m_crosshairColour = Qt::green;
 	    break;
 
 	case YellowOnBlack:
 	    px = 256 - pixel;
 	    colour = QColor(px < 64 ? 255 - px/2 :
 			    px < 128 ? 224 - (px - 64) :
 			    px < 192 ? 160 - (px - 128) * 3 / 2 :
 			    256 - px,
 			    pixel,
 			    pixel / 4);
+            m_crosshairColour = QColor::fromHsv(240, 255, 255);
 	    break;
 
         case BlueOnBlack:
             colour = QColor::fromHsv
                 (240, pixel > 226 ? 256 - (pixel - 226) * 8 : 255,
                  (pixel * pixel) / 255);
+            m_crosshairColour = Qt::red;
             break;
 
 	case Rainbow:
 	    hue = 250 - pixel;
 	    if (hue < 0) hue += 256;
 	    colour = QColor::fromHsv(pixel, 255, 255);
+            m_crosshairColour = Qt::white;
 	    break;
 	}
 
 	m_cache->setColour(pixel, colour);
     }

     }
     
     return true;
 } 
 
+bool
+SpectrogramLayer::getCrosshairExtents(View *v, QPainter &paint,
+                                      QPoint cursorPos,
+                                      std::vector<QRect> &extents) const
+{
+    QRect vertical(cursorPos.x() - 12, 0, 12, v->height());
+    extents.push_back(vertical);
+
+    QRect horizontal(0, cursorPos.y(), cursorPos.x(), 1);
+    extents.push_back(horizontal);
+
+    return true;
+}
+
+void
+SpectrogramLayer::paintCrosshairs(View *v, QPainter &paint,
+                                  QPoint cursorPos) const
+{
+    paint.save();
+    paint.setPen(m_crosshairColour);
+
+    paint.drawLine(0, cursorPos.y(), cursorPos.x() - 1, cursorPos.y());
+    paint.drawLine(cursorPos.x(), 0, cursorPos.x(), v->height());
+    
+    float fundamental = getFrequencyForY(v, cursorPos.y());
+
+    int harmonic = 2;
+
+    while (harmonic < 100) {
+
+        float hy = lrintf(getYForFrequency(v, fundamental * harmonic));
+        if (hy < 0 || hy > v->height()) break;
+        
+        int len = 7;
+
+        if (harmonic % 2 == 0) {
+            if (harmonic % 4 == 0) {
+                len = 12;
+            } else {
+                len = 10;
+            }
+        }
+
+        paint.drawLine(cursorPos.x() - len,
+                       hy,
+                       cursorPos.x(),
+                       hy);
+
+        ++harmonic;
+    }
+
+    paint.restore();
+}
+
 QString
 SpectrogramLayer::getFeatureDescription(View *v, QPoint &pos) const
 {
     int x = pos.x();
     int y = pos.y();