Arc

ARC (DXF Reference) center at location dxf.center and radius of dxf.radius from dxf.start_angle to dxf.end_angle. ARC goes always from dxf.start_angle to dxf.end_angle in counter clockwise orientation around the dxf.extrusion vector, which is (0, 0, 1) by default and the usual case for 2D arcs.

Subclass of

ezdxf.entities.Circle

DXF type

'ARC'

Factory function

ezdxf.layouts.BaseLayout.add_arc()

Inherited DXF attributes

Common graphical DXF attributes

Warning

Do not instantiate entity classes by yourself - always use the provided factory functions!

class ezdxf.entities.Arc
dxf.center

Center point of arc (2D/3D Point in OCS)

dxf.radius

Radius of arc (float)

dxf.start_angle

Start angle in degrees (float)

dxf.end_angle

End angle in degrees (float)

start_point

Returns the start point of the arc in WCS, takes OCS into account.

end_point

Returns the end point of the arc in WCS, takes OCS into account.

angles(num: int) → Iterable[float]

Returns num angles from start- to end angle in degrees in counter clockwise order.

All angles are normalized in the range from [0, 360).

flattening(sagitta: float) → Iterable[Vertex]

Approximate the arc by vertices in WCS, argument segment is the max. distance from the center of an arc segment to the center of its chord. Yields Vec2 objects for 2D arcs and Vec3 objects for 3D arcs.

New in version 0.15.

transform(m: Matrix44)Arc

Transform ARC entity by transformation matrix m inplace.

Raises NonUniformScalingError() for non uniform scaling.

New in version 0.13.

to_ellipse(replace=True)Ellipse

Convert CIRCLE/ARC to an Ellipse entity.

Adds the new ELLIPSE entity to the entity database and to the same layout as the source entity.

Parameters

replace – replace (delete) source entity by ELLIPSE entity if True

New in version 0.13.

to_spline(replace=True)Spline

Convert CIRCLE/ARC to a Spline entity.

Adds the new SPLINE entity to the entity database and to the same layout as the source entity.

Parameters

replace – replace (delete) source entity by SPLINE entity if True

New in version 0.13.

construction_tool() → ConstructionArc

Returns 2D construction tool ezdxf.math.ConstructionArc, ignoring the extrusion vector.

New in version 0.14.

apply_construction_tool(arc: ConstructionArc)Arc

Set ARC data from construction tool ezdxf.math.ConstructionArc, will not change the extrusion vector.

New in version 0.14.