Trace

This module provides tools to create banded lines like LWPOLYLINE with width information. Path rendering as quadrilaterals: Trace, Solid or Face3d.

class ezdxf.render.trace.TraceBuilder(*args, **kwds)

Sequence of 2D banded lines like polylines with start- and end width or curves with start- and end width.

Accepts 3D input, but z-axis is ignored.

abs_tol

Absolute tolerance for floating point comparisons

append(trace: ezdxf.render.trace.AbstractTrace) → None

Append a new trace.

close()

Close multi traces by merging first and last trace, if linear traces.

faces() → Iterable[Tuple[Vec2, Vec2, Vec2, Vec2]

Yields all faces as 4-tuples of Vec2 objects.

virtual_entities(dxftype='TRACE', dxfattribs: Dict = None, doc: Drawing = None) → Union[Solid, Trace, Face3d]

Yields faces as SOLID, TRACE or 3DFACE entities with DXF attributes given in dxfattribs.

If a document is given, the doc attribute of the new entities will be set and the new entities will be automatically added to the entity database of that document.

Parameters

  • dxftype – DXF type as string, “SOLID”, “TRACE” or “3DFACE”

  • dxfattribs – DXF attributes for SOLID, TRACE or 3DFACE entities

  • doc – associated document

classmethod from_polyline(polyline: DXFGraphic, segments: int = 64) → TraceBuilder

Create a complete trace from a LWPOLYLINE or a 2D POLYLINE entity, the trace consist of multiple sub-traces if bulge values are present.

Parameters

  • polyline – LWPolyline or 2D Polyline

  • segments – count of segments for bulge approximation, given count is for a full circle, partial arcs have proportional less segments, but at least 3

__len__()
__getitem__(item)
class ezdxf.render.trace.LinearTrace

Linear 2D banded lines like polylines with start- and end width.

Accepts 3D input, but z-axis is ignored.

abs_tol

Absolute tolerance for floating point comparisons

is_started

True if at least one station exist.

add_station(point: Vertex, start_width: float, end_width: float = None) → None

Add a trace station (like a vertex) at location point, start_width is the width of the next segment starting at this station, end_width is the end width of the next segment.

Adding the last location again, replaces the actual last location e.g. adding lines (a, b), (b, c), creates only 3 stations (a, b, c), this is very important to connect to/from splines.

Parameters

  • point – 2D location (vertex), z-axis of 3D vertices is ignored.

  • start_width – start width of next segment

  • end_width – end width of next segment

faces() → Iterable[Tuple[Vec2, Vec2, Vec2, Vec2]

Yields all faces as 4-tuples of Vec2 objects.

First and last miter is 90 degrees if the path is not closed, otherwise the intersection of first and last segment is taken into account, a closed path has to have explicit the same last and first vertex.

virtual_entities(dxftype='TRACE', dxfattribs: Dict = None, doc: Drawing = None) → Union[Solid, Trace, Face3d]

Yields faces as SOLID, TRACE or 3DFACE entities with DXF attributes given in dxfattribs.

If a document is given, the doc attribute of the new entities will be set and the new entities will be automatically added to the entity database of that document.

Parameters

  • dxftype – DXF type as string, “SOLID”, “TRACE” or “3DFACE”

  • dxfattribs – DXF attributes for SOLID, TRACE or 3DFACE entities

  • doc – associated document

class ezdxf.render.trace.CurvedTrace

2D banded curves like arcs or splines with start- and end width.

Represents always only one curved entity and all miter of curve segments are perpendicular to curve tangents.

Accepts 3D input, but z-axis is ignored.

faces() → Iterable[Tuple[Vec2, Vec2, Vec2, Vec2]

Yields all faces as 4-tuples of Vec2 objects.

virtual_entities(dxftype='TRACE', dxfattribs: Dict = None, doc: Drawing = None) → Union[Solid, Trace, Face3d]

Yields faces as SOLID, TRACE or 3DFACE entities with DXF attributes given in dxfattribs.

If a document is given, the doc attribute of the new entities will be set and the new entities will be automatically added to the entity database of that document.

Parameters

  • dxftype – DXF type as string, “SOLID”, “TRACE” or “3DFACE”

  • dxfattribs – DXF attributes for SOLID, TRACE or 3DFACE entities

  • doc – associated document

classmethod from_arc(arc: ezdxf.math.arc.ConstructionArc, start_width: float, end_width: float, segments: int = 64) → ezdxf.render.trace.CurvedTrace

Create curved trace from an arc.

Parameters

  • arc – ConstructionArc object

  • start_width – start width

  • end_width – end width

  • segments – count of segments for full circle (360 degree) approximation, partial arcs have proportional less segments, but at least 3

Raises

ValueError – if arc.radius <= 0

classmethod from_spline(spline: ezdxf.math.bspline.BSpline, start_width: float, end_width: float, segments: int) → ezdxf.render.trace.CurvedTrace

Create curved trace from a B-spline.

Parameters

  • spline – BSpline object

  • start_width – start width

  • end_width – end width

  • segments – count of segments for approximation