glam::f32

Struct Affine2

#[repr(C)]pub struct Affine2 {
    pub matrix2: Mat2,
    pub translation: Vec2,
}

Expand description

A 2D affine transform, which can represent translation, rotation, scaling and shear.

Fields§

§matrix2: Mat2§translation: Vec2

Implementations§

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impl Affine2

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pub const ZERO: Self = _

The degenerate zero transform.

This transforms any finite vector and point to zero. The zero transform is non-invertible.

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pub const IDENTITY: Self = _

The identity transform.

Multiplying a vector with this returns the same vector.

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pub const NAN: Self = _

All NAN:s.

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pub const fn from_cols(x_axis: Vec2, y_axis: Vec2, z_axis: Vec2) -> Self

Creates an affine transform from three column vectors.

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pub fn from_cols_array(m: &[f32; 6]) -> Self

Creates an affine transform from a [f32; 6] array stored in column major order.

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pub fn to_cols_array(&self) -> [f32; 6]

Creates a [f32; 6] array storing data in column major order.

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pub fn from_cols_array_2d(m: &[[f32; 2]; 3]) -> Self

Creates an affine transform from a [[f32; 2]; 3] 2D array stored in column major order. If your data is in row major order you will need to transpose the returned matrix.

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pub fn to_cols_array_2d(&self) -> [[f32; 2]; 3]

Creates a [[f32; 2]; 3] 2D array storing data in column major order. If you require data in row major order transpose the matrix first.

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pub fn from_cols_slice(slice: &[f32]) -> Self

Creates an affine transform from the first 6 values in slice.

§Panics

Panics if slice is less than 6 elements long.

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pub fn write_cols_to_slice(self, slice: &mut [f32])

Writes the columns of self to the first 6 elements in slice.

§Panics

Panics if slice is less than 6 elements long.

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pub fn from_scale(scale: Vec2) -> Self

Creates an affine transform that changes scale. Note that if any scale is zero the transform will be non-invertible.

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pub fn from_angle(angle: f32) -> Self

Creates an affine transform from the given rotation angle.

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pub fn from_translation(translation: Vec2) -> Self

Creates an affine transformation from the given 2D translation.

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pub fn from_mat2(matrix2: Mat2) -> Self

Creates an affine transform from a 2x2 matrix (expressing scale, shear and rotation)

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pub fn from_mat2_translation(matrix2: Mat2, translation: Vec2) -> Self

Creates an affine transform from a 2x2 matrix (expressing scale, shear and rotation) and a translation vector.

Equivalent to Affine2::from_translation(translation) * Affine2::from_mat2(mat2)

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pub fn from_scale_angle_translation( scale: Vec2, angle: f32, translation: Vec2, ) -> Self

Creates an affine transform from the given 2D scale, rotation angle (in radians) and translation.

Equivalent to Affine2::from_translation(translation) * Affine2::from_angle(angle) * Affine2::from_scale(scale)

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pub fn from_angle_translation(angle: f32, translation: Vec2) -> Self

Creates an affine transform from the given 2D rotation angle (in radians) and translation.

Equivalent to Affine2::from_translation(translation) * Affine2::from_angle(angle)

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pub fn from_mat3(m: Mat3) -> Self

The given Mat3 must be an affine transform,

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pub fn from_mat3a(m: Mat3A) -> Self

The given Mat3A must be an affine transform,

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pub fn to_scale_angle_translation(self) -> (Vec2, f32, Vec2)

Extracts scale, angle and translation from self.

The transform is expected to be non-degenerate and without shearing, or the output will be invalid.

§Panics

Will panic if the determinant self.matrix2 is zero or if the resulting scale vector contains any zero elements when glam_assert is enabled.

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pub fn transform_point2(&self, rhs: Vec2) -> Vec2

Transforms the given 2D point, applying shear, scale, rotation and translation.

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pub fn transform_vector2(&self, rhs: Vec2) -> Vec2

Transforms the given 2D vector, applying shear, scale and rotation (but NOT translation).

To also apply translation, use Self::transform_point2() instead.

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pub fn is_finite(&self) -> bool

Returns true if, and only if, all elements are finite.

If any element is either NaN, positive or negative infinity, this will return false.

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pub fn is_nan(&self) -> bool

Returns true if any elements are NaN.

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pub fn abs_diff_eq(&self, rhs: Self, max_abs_diff: f32) -> bool

Returns true if the absolute difference of all elements between self and rhs is less than or equal to max_abs_diff.

This can be used to compare if two 3x4 matrices contain similar elements. It works best when comparing with a known value. The max_abs_diff that should be used used depends on the values being compared against.

For more see comparing floating point numbers.

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