Added zoom limits

[pulseview.git] / sigview.cpp

diff --git a/sigview.cpp b/sigview.cpp
index dea3cbc1255bc646307cbd39448be239c0982fae..c46476a30f386920b799e68580b1c31f4c0b2cf2 100644 (file)
--- a/sigview.cpp
+++ b/sigview.cpp
@@ -35,6 +35,9 @@
 using namespace boost;
 using namespace std;
 
 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;
 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);
        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();
 }
        _offset = cursor_offset - _scale * x;
        update();
 }