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) → Iterator[Vec3]¶: 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.

transform(m: Matrix44) → Arc¶

Transform ARC entity by transformation matrix m inplace.

Raises NonUniformScalingError() for non uniform scaling.

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

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

construction_tool() → ConstructionArc¶: Returns 2D construction tool ezdxf.math.ConstructionArc, ignoring the extrusion vector.

apply_construction_tool(arc: ConstructionArc) → Arc¶: Set ARC data from construction tool ezdxf.math.ConstructionArc, will not change the extrusion vector.