Enum Rotation 

pub enum Rotation {
    None,
    CW90,
    CW180,
    CW270,
}

Viewport rotation in 90-degree increments (clockwise).

When applied, the entire UI is rendered rotated and all input coordinates (mouse, touch) are remapped. Application code sees a normal coordinate space — rotation is transparent.

Use cases: pinball cabinet displays, kiosks, embedded screens, industrial panels mounted in non-standard orientation.

Variants

None

No rotation (0 degrees).

CW90

90 degrees clockwise.

CW180

180 degrees.

CW270

270 degrees clockwise (= 90 degrees counter-clockwise).

Implementations

impl Rotation

pub fn swaps_axes(self) -> bool

true if width and height are swapped (90 or 270 degrees).

pub fn is_none(self) -> bool

true if this is Self::None.

pub fn next_cw(self) -> Self

The next rotation, cycling clockwise: None → CW90 → CW180 → CW270 → None.

Handy for a “rotate 90°” button or keyboard shortcut.

pub fn prev_cw(self) -> Self

The previous rotation, cycling counter-clockwise.

pub fn transform_pos(self, pos: Pos2, physical_size: Vec2) -> Pos2

Transform a point from physical screen space to logical UI space.

physical_size is the physical window size (before rotation).

pub fn inverse_transform_pos(self, pos: Pos2, logical_size: Vec2) -> Pos2

Transform a point from logical UI space back to physical screen space.

pub fn transform_vec(self, vec: Vec2) -> Vec2

Transform a delta/vector (no translation needed).

pub fn inverse_angle(self) -> f32

Clockwise angle (radians) of the logical→physical mapping.

This is the rotational part of Self::inverse_transform_pos, expressed as the clockwise angle used by epaint’s per-shape angle fields (egui::epaint::TextShape::angle, RectShape::angle, EllipseShape::angle).

Note the sign: it is the opposite of the screen’s physical mounting (e.g. a screen mounted 90° CW is compensated by rendering the UI at -90°), matching the directional remapping in crate::CursorIconExt::rotate.

pub fn transform_screen_rect(self, physical_rect: Rect) -> Rect

Logical screen rect after rotation. For 90/270, width and height are swapped.

Trait Implementations

impl Clone for Rotation

fn clone(&self) -> Rotation

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Rotation

impl Debug for Rotation

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

Formats the value using the given formatter.

impl Default for Rotation

fn default() -> Rotation

Returns the “default value” for a type.

impl Eq for Rotation

impl Hash for Rotation

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Rotation

fn eq(&self, other: &Rotation) -> 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 StructuralPartialEq for Rotation