X-Git-Url: https://sigrok.org/gitweb/?p=pulseview.git;a=blobdiff_plain;f=sigview.cpp;h=c46476a30f386920b799e68580b1c31f4c0b2cf2;hp=dea3cbc1255bc646307cbd39448be239c0982fae;hb=0a4db787f8b25e1b4d68b4bcb3e2c9a26c8c13bb;hpb=aeed8b418c0e751d7fef6aeaea1347af2077f904

diff --git a/sigview.cpp b/sigview.cpp
index dea3cbc1..c46476a3 100644
--- a/sigview.cpp
+++ b/sigview.cpp
@@ -35,6 +35,9 @@
 using namespace boost;
 using namespace std;
 
+const double SigView::MaxScale = 1e9;
+const double SigView::MinScale = 1e-15;
+
 const int SigView::SignalHeight = 50;
 const int SigView::LabelMarginWidth = 70;
 const int SigView::RulerHeight = 30;
@@ -165,6 +168,7 @@ void SigView::wheelEvent(QWheelEvent *event)
 	const double x = event->x() - LabelMarginWidth;
 	const double cursor_offset = _offset + _scale * x;
 	_scale *= powf(3.0/2.0, -event->delta() / 120);
+	_scale = max(min(_scale, MaxScale), MinScale);
 	_offset = cursor_offset - _scale * x;
 	update();
 }