Transform2D¶
2D transformation (2×3 matrix).
Description¶
2×3 matrix (2 rows, 3 columns) used for 2D linear transformations. It can represent transformations such as translation, rotation, or scaling. It consists of three Vector2 values: x, y, and the origin.
For more information, read the "Matrices and transforms" documentation article.
Tutorials¶
Properties¶
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Methods¶
Transform2D ( Transform from ) |
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Transform2D ( Vector2 x_axis, Vector2 y_axis, Vector2 origin ) |
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Transform2D ( float rotation, Vector2 position ) |
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affine_inverse ( ) |
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basis_xform ( Vector2 v ) |
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basis_xform_inv ( Vector2 v ) |
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determinant ( ) |
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get_origin ( ) |
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get_rotation ( ) |
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get_scale ( ) |
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interpolate_with ( Transform2D transform, float weight ) |
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inverse ( ) |
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is_equal_approx ( Transform2D transform ) |
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orthonormalized ( ) |
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translated ( Vector2 offset ) |
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Constants¶
IDENTITY = Transform2D( 1, 0, 0, 1, 0, 0 )
The identity Transform2D with no translation, rotation or scaling applied. When applied to other data structures, IDENTITY performs no transformation.
FLIP_X = Transform2D( -1, 0, 0, 1, 0, 0 )
The Transform2D that will flip something along the X axis.
FLIP_Y = Transform2D( 1, 0, 0, -1, 0, 0 )
The Transform2D that will flip something along the Y axis.
Property Descriptions¶
Vector2 origin = Vector2( 0, 0 )
The origin vector (column 2, the third column). Equivalent to array index 2. The origin vector represents translation.
Vector2 x = Vector2( 1, 0 )
The basis matrix's X vector (column 0). Equivalent to array index 0.
Vector2 y = Vector2( 0, 1 )
The basis matrix's Y vector (column 1). Equivalent to array index 1.
Method Descriptions¶
Transform2D Transform2D ( Transform from )
Constructs the transform from a 3D Transform.
Transform2D Transform2D ( Vector2 x_axis, Vector2 y_axis, Vector2 origin )
Constructs the transform from 3 Vector2 values representing x, y, and the origin (the three column vectors).
Transform2D Transform2D ( float rotation, Vector2 position )
Constructs the transform from a given angle (in radians) and position.
Transform2D affine_inverse ( )
Returns the inverse of the transform, under the assumption that the transformation is composed of rotation, scaling and translation.
Vector2 basis_xform ( Vector2 v )
Returns a vector transformed (multiplied) by the basis matrix.
This method does not account for translation (the origin vector).
Vector2 basis_xform_inv ( Vector2 v )
Returns a vector transformed (multiplied) by the inverse basis matrix.
This method does not account for translation (the origin vector).
float determinant ( )
Returns the determinant of the basis matrix. If the basis is uniformly scaled, then its determinant equals the square of the scale factor.
A negative determinant means the basis was flipped, so one part of the scale is negative. A zero determinant means the basis isn't invertible, and is usually considered invalid.
Vector2 get_origin ( )
Returns the transform's origin (translation).
float get_rotation ( )
Returns the transform's rotation (in radians).
Vector2 get_scale ( )
Returns the scale.
Transform2D interpolate_with ( Transform2D transform, float weight )
Returns a transform interpolated between this transform and another by a given weight (on the range of 0.0 to 1.0).
Transform2D inverse ( )
Returns the inverse of the transform, under the assumption that the transformation is composed of rotation and translation (no scaling, use affine_inverse for transforms with scaling).
bool is_equal_approx ( Transform2D transform )
Returns true if this transform and transform are approximately equal, by calling is_equal_approx on each component.
Transform2D orthonormalized ( )
Returns the transform with the basis orthogonal (90 degrees), and normalized axis vectors (scale of 1 or -1).
Transform2D rotated ( float angle )
Returns a copy of the transform rotated by the given angle (in radians), using matrix multiplication.
Transform2D scaled ( Vector2 scale )
Returns a copy of the transform scaled by the given scale factor, using matrix multiplication.
Note: Negative X scales in 2D are not decomposable from the transformation matrix. Due to the way scale is represented with transformation matrices in Redot, negative scales on the X axis will be changed to negative scales on the Y axis and a rotation of 180 degrees when decomposed.
Transform2D translated ( Vector2 offset )
Returns a copy of the transform translated by the given offset, relative to the transform's basis vectors.
Unlike rotated and scaled, this does not use matrix multiplication.
Transforms the given Vector2, Rect2, or PoolVector2Array by this transform.
Variant xform_inv ( Variant v )
Inverse-transforms the given Vector2, Rect2, or PoolVector2Array by this transform, under the assumption that the transformation is composed of rotation and translation (no scaling). Equivalent to calling inverse().xform(v) on this transform. For affine transformations (e.g. with scaling) see affine_inverse method.