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Standard easing functions for motion in Excalibur, defined on a domain of [0, duration] and a range from [+startValue,+endValue] Given a time, the function will return a value from positive startValue to positive endValue.

function Linear (t) {
return t * t;
}

// accelerating from zero velocity
function EaseInQuad (t) {
return t * t;
}

// decelerating to zero velocity
function EaseOutQuad (t) {
return t * (2 - t);
}

// acceleration until halfway, then deceleration
function EaseInOutQuad (t) {
return t < .5 ? 2 * t * t : -1 + (4 - 2 * t) * t;
}

// accelerating from zero velocity
function EaseInCubic (t) {
return t * t * t;
}

// decelerating to zero velocity
function EaseOutCubic (t) {
return (--t) * t * t + 1;
}

// acceleration until halfway, then deceleration
function EaseInOutCubic (t) {
return t < .5 ? 4 * t * t * t : (t - 1) * (2 * t - 2) * (2 * t - 2) + 1;
}

Hierarchy

  • EasingFunctions

Index

Constructors

Properties

EaseInCubic: Util.EasingFunction = ...
EaseInOutCubic: Util.EasingFunction = ...
EaseInOutQuad: Util.EasingFunction = ...
EaseInQuad: (time: number, start: number, end: number, duration: number) => number = ...

Type declaration

    • (time: number, start: number, end: number, duration: number): number
    • Parameters

      • time: number
      • start: number
      • end: number
      • duration: number

      Returns number

EaseOutCubic: Util.EasingFunction = ...
EaseOutQuad: Util.EasingFunction = ...
Linear: Util.EasingFunction = ...

Methods

  • CreateReversibleEasingFunction(easing: Util.EasingFunction): (time: number, start: number, end: number, duration: number) => number
  • Parameters

    Returns (time: number, start: number, end: number, duration: number) => number

      • (time: number, start: number, end: number, duration: number): number
      • Parameters

        • time: number
        • start: number
        • end: number
        • duration: number

        Returns number