diff options
| -rw-r--r-- | spline-widget/spline-widget.cpp | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/spline-widget/spline-widget.cpp b/spline-widget/spline-widget.cpp index 762c63d7..47ae6fdd 100644 --- a/spline-widget/spline-widget.cpp +++ b/spline-widget/spline-widget.cpp @@ -543,17 +543,18 @@ QPointF spline_widget::pixel_coord_to_point(const QPoint& point) if (snap_x > 0) { - x += snap_x / 2.; + x += snap_x * .5; x -= std::fmod(x, snap_x); - const volatile int x_ = int(x * c); - x = x_ / double(c); + // truncate after few decimal places to reduce rounding errors. + // round upward to nearest. + x = int(x * c + .5/c) / double(c); } if (snap_y > 0) { - y += snap_y / 2.; + y += snap_y * .5; y -= std::fmod(y, snap_y); - const volatile int y_ = int(y * c); - y = y_ / double(c); + // idem + y = int(y * c + .5/c) / double(c); } if (x < 0) |