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-rw-r--r--qt-ui/profile/divecartesianaxis.cpp9
1 files changed, 6 insertions, 3 deletions
diff --git a/qt-ui/profile/divecartesianaxis.cpp b/qt-ui/profile/divecartesianaxis.cpp
index c780b7a63..3fdafa375 100644
--- a/qt-ui/profile/divecartesianaxis.cpp
+++ b/qt-ui/profile/divecartesianaxis.cpp
@@ -187,12 +187,15 @@ void DiveCartesianAxis::setTickInterval(double i)
interval = i;
}
-qreal DiveCartesianAxis::valueAt(const QPointF& p)
+qreal DiveCartesianAxis::valueAt(const QPointF& p) const
{
QLineF m = line();
+ QPointF relativePosition = p;
+ relativePosition -= pos(); // normalize p based on the axis' offset on screen
+
double retValue = (orientation == LeftToRight || orientation == RightToLeft) ?
- max * (p.x() - m.x1()) / (m.x2() - m.x1()) :
- max * (p.y() - m.y1()) / (m.y2() - m.y1());
+ max * (relativePosition.x() - m.x1()) / (m.x2() - m.x1()) :
+ max * (relativePosition.y() - m.y1()) / (m.y2() - m.y1());
return retValue;
}