X-Git-Url: http://git.code-monkey.de/?p=pulseview.git;a=blobdiff_plain;f=pv%2Fviews%2Ftrace%2Fview.cpp;h=79277b4e17074708b0f1e3718ef6eeb4996d2c93;hp=fa911f0b5ad92ae8a27c0f96b3d69de2de984aab;hb=e23567ed84aa55e2a0c48252080058186f6b80e7;hpb=7a0d99e6d48870c51d00c25617eb309181dc2a60

diff --git a/pv/views/trace/view.cpp b/pv/views/trace/view.cpp
index fa911f0..79277b4 100644
--- a/pv/views/trace/view.cpp
+++ b/pv/views/trace/view.cpp
@@ -495,9 +495,12 @@ const Timestamp& View::ruler_offset() const
 	return ruler_offset_;
 }
 
-void View::set_zero_position(pv::util::Timestamp& position)
+void View::set_zero_position(const pv::util::Timestamp& position)
 {
-	ruler_shift_ = -position;
+	// ruler shift is a negative offset and the new zero position is relative
+	// to the current offset. Hence, we adjust the ruler shift only by the
+	// difference.
+	ruler_shift_ = -(position + (-ruler_shift_));
 
 	// Force an immediate update of the offsets
 	set_offset(offset_, true);