Struct PinchTracker 

pub struct PinchTracker { /* private fields */ }

Turns the total scale a gesture reports into how much it changed since the last event.

Implementations

impl PinchTracker

pub fn begin(&mut self)

A gesture began: scales count from here.

pub fn update(&mut self, scale: f64) -> f32

The gesture stands at this scale. Returns the change as a fraction, 0.1 for 10% bigger.

Trait Implementations

impl Clone for PinchTracker

fn clone(&self) -> PinchTracker

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for PinchTracker

impl Debug for PinchTracker

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

Formats the value using the given formatter.

impl Default for PinchTracker

fn default() -> Self

Returns the “default value” for a type.