Initial implementation of labels

[pulseview.git] / signal.cpp

diff --git a/signal.cpp b/signal.cpp
index d35be6bfed5dfecae1382525f2885732ec9ff206..24d1e5236e2002db28c1352c6328269997e6af76 100644 (file)
--- a/signal.cpp
+++ b/signal.cpp
@@ -20,7 +20,9 @@
 
 #include "signal.h"
 
-#include <memory.h>
+#include "extdef.h"
+
+const QSizeF Signal::LabelPadding(4, 0);
 
 Signal::Signal(QString name) :
        _name(name)
@@ -31,3 +33,41 @@ QString Signal::get_name() const
 {
        return _name;
 }
+
+void Signal::paint_label(QPainter &p, const QRect &rect)
+{
+       p.setBrush(get_colour());
+
+       const QString text(_name);
+       const QColor colour = get_colour();
+
+       const QSizeF text_size = p.boundingRect(
+               QRectF(0, 0, rect.width(), 0), 0, text).size();
+
+       const float nominal_offset = get_nominal_offset(rect);
+       const QSizeF label_size(
+               text_size.width() + LabelPadding.width() * 2,
+               text_size.height() + LabelPadding.height() * 2);
+       const float label_arrow_length = label_size.height() / 2;
+       const QRectF label_rect(
+               rect.right() - label_arrow_length - label_size.width(),
+               nominal_offset - label_size.height() / 2,
+               label_size.width(), label_size.height());
+
+       // Paint the label
+       const QPointF points[] = {
+               label_rect.topLeft(),
+               label_rect.topRight(),
+               QPointF(rect.right(), nominal_offset),
+               label_rect.bottomRight(),
+               label_rect.bottomLeft()
+       };
+
+       p.setPen(Qt::black);
+       p.setBrush(colour);
+       p.drawPolygon(points, countof(points));
+
+       // Paint the text
+       p.setPen((colour.lightness() > 64) ? Qt::black : Qt::white);
+       p.drawText(label_rect, Qt::AlignCenter | Qt::AlignVCenter, text);
+}