78 lines
1.8 KiB
TypeScript
78 lines
1.8 KiB
TypeScript
import { Comp, Layer } from 'expression-globals-typescript';
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const version = '_npmVersion';
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const thisComp = new Comp();
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const thisLayer = new Layer();
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let thisProperty;
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function get_functions(time: number = thisLayer.time)
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{
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function get_key_index(forward = false, input_property = thisProperty)
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{
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let n = 0;
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if (input_property.numKeys > 0)
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{
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n = input_property.nearestKey(time).index;
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if (input_property.key(n).time > time && !forward) n--;
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else if (input_property.key(n).time <= time && forward) n++;
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}
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return Math.min(n, input_property.numKeys);
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}
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function angle_offset(rot: number, pos: number)
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{
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rot = thisLayer.degreesToRadians(rot - 90);
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const x = Math.cos(rot);
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const y = Math.sin(rot);
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return [pos*x, pos*y];
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}
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// https://gist.github.com/animoplex/aafd6a157282351c8dfeea385d969ef2
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function inertial_bounce(amp: number, freq: number, decay: number, input_property = thisProperty)
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{
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const n = get_key_index();
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let t = 0;
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if (n != 0)
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{
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t = time - input_property.key(n).time;
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}
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if (n > 0 && t < 1)
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{
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const v = input_property.velocityAtTime(input_property.key(n).time - thisComp.frameDuration/10);
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return input_property.value + v * (amp / 100) * Math.sin(freq * t * 2 * Math.PI) / Math.exp(decay*t);
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}
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else
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{
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return t;
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}
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}
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const YTPMV = {
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flip: function(input_property = thisProperty, mult = 100)
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{
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const n = get_key_index(undefined, input_property);
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return (n % 2 != 0 || n == 0) ? 1*mult : -mult;
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},
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time_reset: function(input_property = thisProperty)
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{
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const n = get_key_index(undefined, input_property);
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return (n > 0) ? time - input_property.key(n).time : 0;
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}
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};
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return {
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get_key_index,
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angle_offset,
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inertial_bounce,
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YTPMV
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};
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}
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export {
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version,
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get_functions
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}; |