Enum gsk4::TransformCategory[][src]

#[non_exhaustive]
pub enum TransformCategory {
    Unknown,
    Any,
    _3d,
    _2d,
    _2dAffine,
    _2dTranslate,
    Identity,
    // some variants omitted
}
Expand description

The categories of matrices relevant for GSK and GTK.

Note that any category includes matrices of all later categories. So if you want to for example check if a matrix is a 2D matrix, category >= GSK_TRANSFORM_CATEGORY_2D is the way to do this.

Also keep in mind that rounding errors may cause matrices to not conform to their categories. Otherwise, matrix operations done via multiplication will not worsen categories. So for the matrix multiplication C = A * B, category(C) = MIN (category(A), category(B)).

Variants (Non-exhaustive)

This enum is marked as non-exhaustive
Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.
Unknown

The category of the matrix has not been determined.

Any

Analyzing the matrix concluded that it does not fit in any other category.

_3d

The matrix is a 3D matrix. This means that the w column (the last column) has the values (0, 0, 0, 1).

_2d

The matrix is a 2D matrix. This is equivalent to graphene::Matrix::is_2d() returning true. In particular, this means that Cairo can deal with the matrix.

_2dAffine

The matrix is a combination of 2D scale and 2D translation operations. In particular, this means that any rectangle can be transformed exactly using this matrix.

_2dTranslate

The matrix is a 2D translation.

Identity

The matrix is the identity matrix.

Trait Implementations

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