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Transform2D¶
A 2×3 matrix representing a 2D transformation.
描述¶
A 2×3 matrix (2 rows, 3 columns) used for 2D linear transformations. It can represent transformations such as translation, rotation, and scaling. It consists of three Vector2 values: x, y, and the origin.
For more information, read the "Matrices and transforms" documentation article.
备注
There are notable differences when using this API with C#. See C# API 与 GDScript 的差异 for more information.
教程¶
属性¶
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构造函数¶
Transform2D ( ) |
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Transform2D ( Transform2D from ) |
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Transform2D ( float rotation, Vector2 position ) |
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Transform2D ( float rotation, Vector2 scale, float skew, Vector2 position ) |
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Transform2D ( Vector2 x_axis, Vector2 y_axis, Vector2 origin ) |
Methods¶
affine_inverse ( ) const |
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basis_xform ( Vector2 v ) const |
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basis_xform_inv ( Vector2 v ) const |
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determinant ( ) const |
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get_origin ( ) const |
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get_rotation ( ) const |
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get_scale ( ) const |
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get_skew ( ) const |
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interpolate_with ( Transform2D xform, float weight ) const |
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inverse ( ) const |
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is_equal_approx ( Transform2D xform ) const |
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is_finite ( ) const |
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looking_at ( Vector2 target=Vector2(0, 0) ) const |
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orthonormalized ( ) const |
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rotated_local ( float angle ) const |
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scaled_local ( Vector2 scale ) const |
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translated ( Vector2 offset ) const |
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translated_local ( Vector2 offset ) const |
运算符¶
operator != ( Transform2D right ) |
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operator * ( PackedVector2Array right ) |
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operator * ( Rect2 right ) |
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operator * ( Transform2D right ) |
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operator * ( Vector2 right ) |
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operator * ( float right ) |
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operator * ( int right ) |
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operator == ( Transform2D right ) |
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operator [] ( int index ) |
常量¶
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.
Constructor Descriptions¶
Transform2D Transform2D ( )
Constructs a default-initialized Transform2D set to IDENTITY.
Transform2D Transform2D ( Transform2D from )
Constructs a Transform2D as a copy of the given Transform2D.
Transform2D Transform2D ( float rotation, Vector2 position )
Constructs the transform from a given angle (in radians) and position.
Transform2D Transform2D ( float rotation, Vector2 scale, float skew, Vector2 position )
Constructs the transform from a given angle (in radians), scale, skew (in radians) and position.
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).
Method Descriptions¶
Transform2D affine_inverse ( ) const
Returns the inverse of the transform, under the assumption that the transformation is composed of rotation, scaling and translation.
Vector2 basis_xform ( Vector2 v ) const
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 ) const
Returns a vector transformed (multiplied) by the inverse basis matrix.
This method does not account for translation (the origin vector).
float determinant ( ) const
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 ( ) const
Returns the transform's origin (translation).
float get_rotation ( ) const
Returns the transform's rotation (in radians).
Vector2 get_scale ( ) const
Returns the scale.
float get_skew ( ) const
Returns the transform's skew (in radians).
Transform2D interpolate_with ( Transform2D xform, float weight ) const
Returns a transform interpolated between this transform and another by a given weight (on the range of 0.0 to 1.0).
Transform2D inverse ( ) const
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 xform ) const
Returns true if this transform and xform are approximately equal, by calling is_equal_approx on each component.
bool is_finite ( ) const
Returns true if this transform is finite, by calling @GlobalScope.is_finite on each component.
Transform2D looking_at ( Vector2 target=Vector2(0, 0) ) const
Returns a copy of the transform rotated such that the rotated X-axis points towards the target position.
Operations take place in global space.
Transform2D orthonormalized ( ) const
Returns the transform with the basis orthogonal (90 degrees), and normalized axis vectors (scale of 1 or -1).
Transform2D rotated ( float angle ) const
Returns a copy of the transform rotated by the given angle (in radians).
This method is an optimized version of multiplying the given transform X with a corresponding rotation transform R from the left, i.e., R * X.
This can be seen as transforming with respect to the global/parent frame.
Transform2D rotated_local ( float angle ) const
Returns a copy of the transform rotated by the given angle (in radians).
This method is an optimized version of multiplying the given transform X with a corresponding rotation transform R from the right, i.e., X * R.
This can be seen as transforming with respect to the local frame.
Transform2D scaled ( Vector2 scale ) const
Returns a copy of the transform scaled by the given scale factor.
This method is an optimized version of multiplying the given transform X with a corresponding scaling transform S from the left, i.e., S * X.
This can be seen as transforming with respect to the global/parent frame.
Transform2D scaled_local ( Vector2 scale ) const
Returns a copy of the transform scaled by the given scale factor.
This method is an optimized version of multiplying the given transform X with a corresponding scaling transform S from the right, i.e., X * S.
This can be seen as transforming with respect to the local frame.
Transform2D translated ( Vector2 offset ) const
Returns a copy of the transform translated by the given offset.
This method is an optimized version of multiplying the given transform X with a corresponding translation transform T from the left, i.e., T * X.
This can be seen as transforming with respect to the global/parent frame.
Transform2D translated_local ( Vector2 offset ) const
Returns a copy of the transform translated by the given offset.
This method is an optimized version of multiplying the given transform X with a corresponding translation transform T from the right, i.e., X * T.
This can be seen as transforming with respect to the local frame.
Operator Descriptions¶
bool operator != ( Transform2D right )
Returns true if the transforms are not equal.
Note: Due to floating-point precision errors, consider using is_equal_approx instead, which is more reliable.
PackedVector2Array operator * ( PackedVector2Array right )
Transforms (multiplies) each element of the Vector2 array by the given Transform2D matrix.
Rect2 operator * ( Rect2 right )
Transforms (multiplies) the Rect2 by the given Transform2D matrix.
Transform2D operator * ( Transform2D right )
Composes these two transformation matrices by multiplying them together. This has the effect of transforming the second transform (the child) by the first transform (the parent).
Vector2 operator * ( Vector2 right )
Transforms (multiplies) the Vector2 by the given Transform2D matrix.
Transform2D operator * ( float right )
This operator multiplies all components of the Transform2D, including the origin vector, which scales it uniformly.
Transform2D operator * ( int right )
This operator multiplies all components of the Transform2D, including the origin vector, which scales it uniformly.
bool operator == ( Transform2D right )
Returns true if the transforms are exactly equal.
Note: Due to floating-point precision errors, consider using is_equal_approx instead, which is more reliable.
Vector2 operator [] ( int index )
Access transform components using their index. t[0] is equivalent to t.x, t[1] is equivalent to t.y, and t[2] is equivalent to t.origin.