+void SigView::mouseMoveEvent(QMouseEvent *event)
+{
+ assert(event);
+}
+
+void SigView::mousePressEvent(QMouseEvent *event)
+{
+ assert(event);
+}
+
+void SigView::mouseReleaseEvent(QMouseEvent *event)
+{
+ assert(event);
+
+ const double cursor_offset = _offset + _scale * (double)event->x();
+
+ switch(event->button())
+ {
+ case Qt::LeftButton:
+ _scale *= 2.0 / 3.0;
+ break;
+
+ case Qt::RightButton:
+ _scale *= 3.0 / 2.0;
+ break;
+ }
+
+ _offset = cursor_offset - _scale * (double)event->x();
+
+ updateGL();
+}
+