Wrong arc start and end points, center point

[gaoxipeng]

Hello, In the dxf file of this attachment, it is incorrect for the center of the arc to be the x coordinate, which should be 3900 in AutoCAD，start_ angle and end_ angle is also wrong
I tried to delete this arc and draw a shape similar to it, and got the correct result, but now this arc is incorrect.

ARC center: (-3900.0, 12242.500000001, 0.0), radius: 877.5000000000002, start_angle: 90.0, end_angle: 178.5307164186462
Start point: (3900.0, 13120.000000001, 0.0), end point: (4777.211491032807, 12265.000000001, 0.0)

Drawing1_t3.zip

[mozman]

The values are correct:

The OCS is defined by the extrusion vector, which is (0, 0,-1) in this case:

The WCS is only equal to the OCS when the extrusion vector is (0, 0, 1) the WCS z-axis.

The upright module can help to convert an inverted extrusion vector to (0, 0, 1).