id summary reporter owner description type status priority milestone component version resolution keywords cc 22703 [Patch] Fix 90° offset of `icon-rotation: way;` in mapcss Woazboat team " The (undocumented) *-rotation: way;in mapcss has an offset of 90° compared to *-rotation: The 90 degree offset occurs because https://josm.openstreetmap.de/browser/josm/trunk/src/org/openstreetmap/josm/tools/RotationAngle.java#L37 uses Geometry.getSegmentAngle, which calculates the angle using Math.atan2 and therefore the rotation starting from the x-axis (east) in counter clockwise direction. The icon rotation is relative to the icon and therefore 'starts' at the y-axis (north) going in the clockwise direction. The returned angle is already correctly inverted to fix the rotation angle, but the 90° offset is not corrected. This can be fixed by adding an offset of - Math.PI/2 to the angle (+Math.PI/2 if done after inversion). https://github.com/JOSM/josm/pull/109 https://github.com/JOSM/josm/pull/109.patch See also #22695" defect closed normal 23.02 Core mappaint fixed