Struct LightAttenuation 

pub struct LightAttenuation {
    pub constant: f64,
    pub linear: f64,
    pub quadratic: f64,
    pub min_cutoff: f64,
    pub max_cutoff: f64,
}

The attenuation of a point or spot light with the distance.

Fields

constant: f64

The constant term of the denominator.

linear: f64

The term proportional to the distance.

quadratic: f64

The term proportional to the square of the distance.

min_cutoff: f64

The distance up to which the light is attenuated as at this distance.

max_cutoff: f64

The distance beyond which the light lights nothing.

Implementations

impl LightAttenuation

pub const NONE: LightAttenuation

No attenuation (the default of WinUI: constant 1).

pub fn factor(&self, distance: f64) -> f64

The factor of the light at distance: none beyond the maximum cutoff, 1 / (constant + linear * d + quadratic * d^2) with the distance raised to the minimum cutoff otherwise (1 when the denominator is not positive).

Deviation (winui-composition.md): WinUI does not say how the cutoffs apply; closer than the minimum cutoff the light is attenuated as at the cutoff, beyond the maximum cutoff it lights nothing.

Trait Implementations

impl Clone for LightAttenuation

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for LightAttenuation

impl Debug for LightAttenuation

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

Formats the value using the given formatter.

impl PartialEq for LightAttenuation

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for LightAttenuation