Transform

Added in version 1.1.

This module provides functions to apply transformations to multiple DXF entities inplace or to virtual copies of that entities in a convenient and safe way:

import math

import ezdxf
from ezdxf import transform

doc = ezdxf.readfile("my.dxf")
msp = doc.modelspace()

log = transform.inplace(msp, m=transform.Matrix44.rotate_z(math.pi/2))

# or more simple
log = transform.z_rotate(msp, math.pi/2)

All functions handle errors by collecting them in an logging object without raising an error. The input entities are an iterable of DXFEntity, which can be any layout, EntityQuery or just a list/sequence of entities and virtual entities are supported as well.

inplace	Transforms the given entities inplace by the transformation matrix m, non-uniform scaling is supported.
copies	Copy entities and transform them by matrix m.
translate	Translates (moves) entities inplace by the offset vector.
scale_uniform	Scales entities inplace by a factor in all axis.
scale	Scales entities inplace by the factors sx in x-axis, sy in y-axis and sz in z-axis.
x_rotate	Rotates entities inplace by angle in radians about the x-axis.
y_rotate	Rotates entities inplace by angle in radians about the y-axis.
z_rotate	Rotates entities inplace by angle in radians about the x-axis.
axis_rotate	Rotates entities inplace by angle in radians about the rotation axis starting at the origin pointing in axis direction.

ezdxf.transform.inplace(entities: Iterable[DXFEntity], m: Matrix44) → Logger

Transforms the given entities inplace by the transformation matrix m, non-uniform scaling is supported. The function converts circular arcs into ellipses to perform non-uniform scaling. The function logs errors and does not raise errors for unsupported entities or transformation errors, see enum Error.

Important

The inplace() function does not support type conversion for virtual entities e.g. non-uniform scaling for CIRCLE, ARC or POLYLINE with bulges, see also function copies().

ezdxf.transform.copies(entities: Iterable[DXFEntity], m: Matrix44 | None = None) → Tuple[Logger, List[DXFEntity]]

Copy entities and transform them by matrix m. Does not raise any exception and ignores all entities that cannot be copied or transformed. Just copies the input entities if matrix m is None. Returns a tuple of Logger and a list of transformed virtual copies. The function supports virtual entities as input and converts circular arcs into ellipses to perform non-uniform scaling.

ezdxf.transform.translate(entities: Iterable[DXFEntity], offset: UVec) → Logger

Translates (moves) entities inplace by the offset vector.

ezdxf.transform.scale_uniform(entities: Iterable[DXFEntity], factor: float) → Logger

Scales entities inplace by a factor in all axis. Scaling factors smaller than MIN_SCALING_FACTOR are ignored.

ezdxf.transform.scale(entities: Iterable[DXFEntity], sx: float, sy: float, sz: float) → Logger

Scales entities inplace by the factors sx in x-axis, sy in y-axis and sz in z-axis. Scaling factors smaller than MIN_SCALING_FACTOR are ignored.

Important

same limitations for virtual entities as the inplace() function

ezdxf.transform.x_rotate(entities: Iterable[DXFEntity], angle: float) → Logger

Rotates entities inplace by angle in radians about the x-axis.

ezdxf.transform.y_rotate(entities: Iterable[DXFEntity], angle: float) → Logger

Rotates entities inplace by angle in radians about the y-axis.

ezdxf.transform.z_rotate(entities: Iterable[DXFEntity], angle: float) → Logger

Rotates entities inplace by angle in radians about the x-axis.

ezdxf.transform.axis_rotate(entities: Iterable[DXFEntity], axis: UVec, angle: float) → Logger

Rotates entities inplace by angle in radians about the rotation axis starting at the origin pointing in axis direction.

ezdxf.transform.MIN_SCALING_FACTOR

Minimal scaling factor: 1e-12

class ezdxf.transform.Error

NONE

No error, same as a boolean False, this allows check if error: ...

COPY_NOT_SUPPORTED

Entity without copy support.

TRANSFORMATION_NOT_SUPPORTED

Entity without transformation support.

NON_UNIFORM_SCALING_ERROR

Circular arcs (CIRCLE, ARC, bulges in POLYLINE and LWPOLYLINE entities) cannot be scaled non-uniformly.

INSERT_TRANSFORMATION_ERROR

INSERT entities cannot represent a non-orthogonal target coordinate system. Maybe exploding the INSERT entities (recursively) beforehand can solve this issue, see function ezdxf.disassemble.recursive_decompose().

VIRTUAL_ENTITY_NOT_SUPPORTED

Transformation not supported for virtual entities e.g. non-uniform scaling for CIRCLE, ARC or POLYLINE with bulges

class ezdxf.transform.Logger

A Sequence of errors as Logger.Entry instances.

class Entry

Named tuple representing a logger entry.

error

Error enum

msg

error message as string

entity

DXF entity which causes the error

__len__() → int

Returns the count of error entries.

__getitem__(index: int) → Entry

Returns the error entry at index.

__iter__() → Iterator[Entry]

Iterates over all error entries.

messages() → list[str]

Returns all error messages as list of strings.