diff options
| -rw-r--r-- | src/desktop-events.cpp | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/src/desktop-events.cpp b/src/desktop-events.cpp index 8f5b53246..f77f3de35 100644 --- a/src/desktop-events.cpp +++ b/src/desktop-events.cpp @@ -271,7 +271,14 @@ gint sp_dt_guide_event(SPCanvasItem *item, GdkEvent *event, gpointer data) double tol = 40.0; Geom::Point const event_w(event->button.x, event->button.y); Geom::Point const event_dt(desktop->w2d(event_w)); - drag_origin = event_dt; + + // Due to the tolerance allowed when grabbing a guide, event_dt will generally + // be close to the guide but not just exactly on it. The drag origin calculated + // here must be exactly on the guide line though, otherwise + // small errors will occur once we snap, see + // https://bugs.launchpad.net/inkscape/+bug/333762 + drag_origin = Geom::projection(event_dt, Geom::Line(guide->point_on_line, guide->angle())); + if (Geom::L2(guide->point_on_line - event_dt) < tol) { // the click was on the guide 'anchor' drag_type = (event->button.state & GDK_SHIFT_MASK) ? SP_DRAG_MOVE_ORIGIN : SP_DRAG_TRANSLATE; |