X-Git-Url: https://sigrok.org/gitweb/?p=pulseview.git;a=blobdiff_plain;f=sigview.cpp;h=4097ae5c25fe1f316b4cd9359dbe44b79bd8a8cf;hp=df1eefec2745fec15041766a4777d086d6e114eb;hb=fb0d32cb540e2ae39d80f7eab02779fb965d9f46;hpb=7cd5faf8cfed1871195aed7a4c325342172944b3

diff --git a/sigview.cpp b/sigview.cpp
index df1eefec..4097ae5c 100644
--- a/sigview.cpp
+++ b/sigview.cpp
@@ -35,7 +35,7 @@ const int SigView::SignalHeight = 50;
 SigView::SigView(SigSession &session, QWidget *parent) :
 	QGLWidget(parent),
         _session(session),
-	_scale(1000000000ULL),
+	_scale(1e-6),
 	_offset(0)
 {
 	connect(&_session, SIGNAL(dataUpdated()),
@@ -98,17 +98,21 @@ void SigView::mouseReleaseEvent(QMouseEvent *event)
 {
 	assert(event);
 
+	const double cursor_offset = _offset + _scale * (double)event->x();
+
 	switch(event->button())
 	{
 	case Qt::LeftButton:
-		_scale = (_scale * 2) / 3;
+		_scale *= 2.0 / 3.0;
 		break;
 
 	case Qt::RightButton:
-		_scale = (_scale * 3) / 2;
+		_scale *= 3.0 / 2.0;
 		break;
 	}
 
+	_offset = cursor_offset - _scale * (double)event->x();
+
 	updateGL();
 }