Scale

class compas.geometry.Scale

Bases: Transformation

Class representing a scale transformation.

Parameters:

matrixlist[list[float]], optional

A 4x4 matrix (or similar) representing a scaling.

checkbool, optional

If True, the provided matrix will be checked for validity.

namestr, optional

The name of the transformation.

Raises:

ValueError

If check is True and the provided transformation matrix is not a scale matrix.

Examples

>>> S = Scale.from_factors([1, 2, 3])
>>> S[0, 0] == 1
True
>>> S[1, 1] == 2
True
>>> S[2, 2] == 3
True

>>> from compas.geometry import Point, Frame
>>> point = Point(2, 5, 0)
>>> frame = Frame(point, (1, 0, 0), (0, 1, 0))
>>> points = [point, Point(2, 10, 0)]
>>> S = Scale.from_factors([2.0] * 3, frame)
>>> points = [p.transformed(S) for p in points]
>>> print(points)
[Point(x=2.000, y=5.000, z=0.000), Point(x=2.000, y=15.000, z=0.000)]

Methods

from_factors

Construct a scale transformation from scale factors.

Inherited Methods

ToString	Converts the instance to a string.
concatenate	Concatenate another transformation to this transformation.
concatenated	Concatenate two transformations into one Transformation.
copy	Returns a copy of the transformation.
decomposed	Decompose the Transformation into its components.
from_change_of_basis	Construct a change of basis transformation between two frames.
from_euler_angles	Construct a transformation from a rotation represented by Euler angles.
from_frame	Construct a transformation from world XY to frame.
from_frame_to_frame	Construct a transformation between two frames.
from_json	Construct an object of this type from a JSON file.
from_jsonstring	Construct an object of this type from a JSON string.
from_list	Creates a transformation from a list of 16 numbers.
from_matrix	Creates a transformation from a list[list[float]] object.
inverse	Returns the inverse transformation.
invert	Invert this transformation.
inverted	Returns the inverse transformation.
sha256	Compute a hash of the data for comparison during version control using the sha256 algorithm.
to_json	Convert an object to its native data representation and save it to a JSON file.
to_jsonstring	Convert an object to its native data representation and save it to a JSON string.
transpose	Transpose the matrix of this transformation.
transposed	Create a transposed copy of this transformation.
validate_data	Validate the data against the object's data schema.