Struct RotatableExtent

pub struct RotatableExtent {
    pub origin: PointF,
    pub width: f32,
    pub height: f32,
    pub angle_degrees: f32,
}

A view bounding box, described in another view’s coordinate system. Concretely, |RotatableExtent| describes the origin, size, and rotation angle about the origin, for a view’s bounding box.

Note: For describing a view’s bounding box in the view’s own coordinate system, see |AlignedExtent|.

We use “V” to refer to the view being described, and “W” to refer to the view where V is being described.

Note that while |angle| can be arbitrary, typical usage is axis aligned. To find the bounding box of V in W in clockwise order, starting with |origin|, where |angle| is 0, 90, 180, or 270, and using o=origin, w=width, h=height, a=angle: a= 0: (o.x, o.y), (o.x + w, o.y), (o.x + w, o.y + h), (o.x, o.y + h) a= 90: (o.x, o.y), (o.x, o.y - w), (o.x + h, o.y - w), (o.x + h, o.y) a=180: (o.x, o.y), (o.x - w, o.y), (o.x - w, o.y - h), (o.x, o.y - h) a=270: (o.x, o.y), (o.x, o.y + w), (o.x - h, o.y + w), (o.x - h, o.y) A formula based on sin a and cos a is readily obtained, but floating point computation may give only approximate results.

Fields

origin: PointF

The origin point of V’s bounding box, in W’s coordinate system.

width: f32

The width of V’s bounding box (along the direction where V’s x axis increases), in W’s coordinate system.

height: f32

The height of V’s bounding box (along the direction where V’s y axis increases), in W’s coordinate system.

angle_degrees: f32

The clockwise rotation about the origin, in degrees.

Trait Implementations

impl Clone for RotatableExtent

fn clone(&self) -> RotatableExtent

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for RotatableExtent

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

Formats the value using the given formatter.

impl<D> Decode<RotatableExtent, D> for RotatableExtent

where D: ResourceDialect,

fn new_empty() -> RotatableExtent

Creates a valid instance of Self. The specific value does not matter, since it will be overwritten by decode.

unsafe fn decode( &mut self, decoder: &mut Decoder<'_, D>, offset: usize, _depth: Depth, ) -> Result<(), Error>

Decodes an object of type T from the decoder’s buffers into self.

impl<D> Encode<RotatableExtent, D> for &RotatableExtent

where D: ResourceDialect,

unsafe fn encode( self, encoder: &mut Encoder<'_, D>, offset: usize, _depth: Depth, ) -> Result<(), Error>

Encodes the object into the encoder’s buffers. Any handles stored in the object are swapped for Handle::INVALID.

impl PartialEq for RotatableExtent

fn eq(&self, other: &RotatableExtent) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl TypeMarker for RotatableExtent

type Owned = RotatableExtent

The owned Rust type which this FIDL type decodes into.

fn inline_align(_context: Context) -> usize

Returns the minimum required alignment of the inline portion of the encoded object. It must be a (nonzero) power of two.

fn inline_size(_context: Context) -> usize

Returns the size of the inline portion of the encoded object, including padding for alignment. Must be a multiple of inline_align.

fn encode_is_copy() -> bool

Returns true if the memory layout of Self::Owned matches the FIDL wire format and encoding requires no validation. When true, we can optimize encoding arrays and vectors of Self::Owned to a single memcpy.

fn decode_is_copy() -> bool

Returns true if the memory layout of Self::Owned matches the FIDL wire format and decoding requires no validation. When true, we can optimize decoding arrays and vectors of Self::Owned to a single memcpy.

impl ValueTypeMarker for RotatableExtent

type Borrowed<'a> = &'a RotatableExtent

The Rust type to use for encoding. This is a particular Encode<Self> type cheaply obtainable from &Self::Owned. There are three cases:

fn borrow( value: &<RotatableExtent as TypeMarker>::Owned, ) -> <RotatableExtent as ValueTypeMarker>::Borrowed<'_>

Cheaply converts from &Self::Owned to Self::Borrowed.

impl Persistable for RotatableExtent

impl StructuralPartialEq for RotatableExtent