pango

Struct Matrix

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pub struct Matrix { /* private fields */ }
Expand description

A Matrix specifies a transformation between user-space and device coordinates.

The transformation is given by

x_device = x_user * matrix->xx + y_user * matrix->xy + matrix->x0;
y_device = x_user * matrix->yx + y_user * matrix->yy + matrix->y0;

GLib type: Inline allocated boxed type with stack copy semantics.

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impl Matrix

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pub fn as_ptr(&self) -> *mut PangoMatrix

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pub unsafe fn from_glib_ptr_borrow<'a>(ptr: *const PangoMatrix) -> &'a Self

Borrows the underlying C value.

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pub unsafe fn from_glib_ptr_borrow_mut<'a>( ptr: *mut PangoMatrix, ) -> &'a mut Self

Borrows the underlying C value mutably.

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impl Matrix

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pub fn concat(&mut self, new_matrix: &Matrix)

Changes the transformation represented by @self to be the transformation given by first applying transformation given by @new_matrix then applying the original transformation.

§new_matrix

a Matrix

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pub fn font_scale_factor(&self) -> f64

Returns the scale factor of a matrix on the height of the font.

That is, the scale factor in the direction perpendicular to the vector that the X coordinate is mapped to. If the scale in the X coordinate is needed as well, use font_scale_factors().

§Returns

the scale factor of @self on the height of the font, or 1.0 if @self is None.

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pub fn font_scale_factors(&self) -> (f64, f64)

Calculates the scale factor of a matrix on the width and height of the font.

That is, @xscale is the scale factor in the direction of the X coordinate, and @yscale is the scale factor in the direction perpendicular to the vector that the X coordinate is mapped to.

Note that output numbers will always be non-negative.

§Returns
§xscale

output scale factor in the x direction

§yscale

output scale factor perpendicular to the x direction

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pub fn slant_ratio(&self) -> f64

Available on crate feature v1_50 only.

Gets the slant ratio of a matrix.

For a simple shear matrix in the form:

1 λ
0 1

this is simply λ.

§Returns

the slant ratio of @self

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pub fn rotate(&mut self, degrees: f64)

Changes the transformation represented by @self to be the transformation given by first rotating by @degrees degrees counter-clockwise then applying the original transformation.

§degrees

degrees to rotate counter-clockwise

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pub fn scale(&mut self, scale_x: f64, scale_y: f64)

Changes the transformation represented by @self to be the transformation given by first scaling by @sx in the X direction and @sy in the Y direction then applying the original transformation.

§scale_x

amount to scale by in X direction

§scale_y

amount to scale by in Y direction

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pub fn transform_distance(&self, dx: &mut f64, dy: &mut f64)

Transforms the distance vector (@dx,@dy) by @self.

This is similar to transform_point(), except that the translation components of the transformation are ignored. The calculation of the returned vector is as follows:

dx2 = dx1 * xx + dy1 * xy;
dy2 = dx1 * yx + dy1 * yy;

Affine transformations are position invariant, so the same vector always transforms to the same vector. If (@x1,@y1) transforms to (@x2,@y2) then (@x1+@dx1,@y1+@dy1) will transform to (@x1+@dx2,@y1+@dy2) for all values of @x1 and @x2.

§dx

in/out X component of a distance vector

§dy

in/out Y component of a distance vector

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pub fn transform_point(&self, x: &mut f64, y: &mut f64)

Transforms the point (@x, @y) by @self.

§x

in/out X position

§y

in/out Y position

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pub fn translate(&mut self, tx: f64, ty: f64)

Changes the transformation represented by @self to be the transformation given by first translating by (@tx, @ty) then applying the original transformation.

§tx

amount to translate in the X direction

§ty

amount to translate in the Y direction

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impl Matrix

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pub fn new(xx: f64, xy: f64, yx: f64, yy: f64, x0: f64, y0: f64) -> Self

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pub fn transform_pixel_rectangle(&self, rect: &mut Rectangle)

First transforms the @rect using @self, then calculates the bounding box of the transformed rectangle.

This function is useful for example when you want to draw a rotated @PangoLayout to an image buffer, and want to know how large the image should be and how much you should shift the layout when rendering.

For better accuracy, you should use transform_rectangle() on original rectangle in Pango units and convert to pixels afterward using extents_to_pixels()’s first argument.

§rect

in/out bounding box in device units

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pub fn transform_rectangle(&self, rect: &mut Rectangle)

First transforms @rect using @self, then calculates the bounding box of the transformed rectangle.

This function is useful for example when you want to draw a rotated @PangoLayout to an image buffer, and want to know how large the image should be and how much you should shift the layout when rendering.

If you have a rectangle in device units (pixels), use transform_pixel_rectangle().

If you have the rectangle in Pango units and want to convert to transformed pixel bounding box, it is more accurate to transform it first (using this function) and pass the result to pango_extents_to_pixels(), first argument, for an inclusive rounded rectangle. However, there are valid reasons that you may want to convert to pixels first and then transform, for example when the transformed coordinates may overflow in Pango units (large matrix translation for example).

§rect

in/out bounding box in Pango units

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pub fn xx(&self) -> f64

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pub fn xy(&self) -> f64

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pub fn yx(&self) -> f64

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pub fn yy(&self) -> f64

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pub fn x0(&self) -> f64

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pub fn y0(&self) -> f64

Trait Implementations§

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impl Clone for Matrix

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fn clone(&self) -> Self

Copies the inline boxed type by value with the type-specific copy function.

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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Matrix

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl HasParamSpec for Matrix

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type ParamSpec = ParamSpecBoxed

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type SetValue = Matrix

Preferred value to be used as setter for the associated ParamSpec.
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type BuilderFn = fn(_: &str) -> ParamSpecBoxedBuilder<'_, Matrix>

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fn param_spec_builder() -> Self::BuilderFn

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impl StaticType for Matrix

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fn static_type() -> Type

Returns the type identifier of Self.
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impl Copy for Matrix

Auto Trait Implementations§

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impl Freeze for Matrix

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impl RefUnwindSafe for Matrix

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impl Send for Matrix

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impl Sync for Matrix

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impl Unpin for Matrix

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impl UnwindSafe for Matrix

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GList> for T

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impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GPtrArray> for T

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impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GSList> for T

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impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GList> for T

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impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GPtrArray> for T

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impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GSList> for T

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GList> for T

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GPtrArray> for T

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GSList> for T

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GList> for T

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GPtrArray> for T

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GSList> for T

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoClosureReturnValue for T
where T: Into<Value>,

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impl<T> Property for T
where T: HasParamSpec,

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type Value = T

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impl<T> PropertyGet for T
where T: HasParamSpec,

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type Value = T

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fn get<R, F>(&self, f: F) -> R
where F: Fn(&<T as PropertyGet>::Value) -> R,

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impl<T> StaticTypeExt for T
where T: StaticType,

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fn ensure_type()

Ensures that the type has been registered with the type system.
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> ToSendValue for T
where T: Send + ToValue + ?Sized,

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fn to_send_value(&self) -> SendValue

Returns a SendValue clone of self.
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T> TryFromClosureReturnValue for T
where T: for<'a> FromValue<'a> + StaticType + 'static,

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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<'a, T, C, E> FromValueOptional<'a> for T
where T: FromValue<'a, Checker = C>, C: ValueTypeChecker<Error = ValueTypeMismatchOrNoneError<E>>, E: Error + Send + 'static,