@meta2d/core/src/utils/easing.js

@meta2d/core: Powerful, Beautiful, Simple, Open - Web-Based 2D At Its Best .

export const easingFunctions = {
    linear: (t) => t,
    easeInQuad: (t) => t * t,
    easeOutQuad: (t) => 1 - (1 - t) * (1 - t),
    easeInOutQuad: (t) => t < 0.5 ? 2 * t * t : 1 - Math.pow(-2 * t + 2, 2) / 2,
    easeInCubic: (t) => t * t * t,
    easeOutCubic: (t) => 1 - Math.pow(1 - t, 3),
    easeInOutCubic: (t) => t < 0.5 ? 4 * t * t * t : 1 - Math.pow(-2 * t + 2, 3) / 2,
    easeInQuart: (t) => t * t * t * t,
    easeOutQuart: (t) => 1 - Math.pow(1 - t, 4),
    easeInOutQuart: (t) => t < 0.5 ? 8 * t * t * t * t : 1 - Math.pow(-2 * t + 2, 4) / 2,
    easeInSine: (t) => 1 - Math.cos((t * Math.PI) / 2),
    easeOutSine: (t) => Math.sin((t * Math.PI) / 2),
    easeInOutSine: (t) => -(Math.cos(Math.PI * t) - 1) / 2,
};
export function getEasingFunction(name) {
    return easingFunctions[name] || easingFunctions['easeOutCubic'];
}
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