playcanvas/build/playcanvas/src/core/math/curve-set.js

PlayCanvas WebGL game engine

import { CURVE_SMOOTHSTEP } from './constants.js';
import { Curve } from './curve.js';
import { CurveEvaluator } from './curve-evaluator.js';

class CurveSet {
		constructor(...args){
				this.curves = [];
				this._type = CURVE_SMOOTHSTEP;
				if (args.length > 1) {
						for(let i = 0; i < args.length; i++){
								this.curves.push(new Curve(args[i]));
						}
				} else if (args.length === 0) {
						this.curves.push(new Curve());
				} else {
						const arg = args[0];
						if (typeof arg === 'number') {
								for(let i = 0; i < arg; i++){
										this.curves.push(new Curve());
								}
						} else {
								for(let i = 0; i < arg.length; i++){
										this.curves.push(new Curve(arg[i]));
								}
						}
				}
		}
		get length() {
				return this.curves.length;
		}
		set type(value) {
				this._type = value;
				for(let i = 0; i < this.curves.length; i++){
						this.curves[i].type = value;
				}
		}
		get type() {
				return this._type;
		}
		get(index) {
				return this.curves[index];
		}
		value(time, result = []) {
				const length = this.curves.length;
				result.length = length;
				for(let i = 0; i < length; i++){
						result[i] = this.curves[i].value(time);
				}
				return result;
		}
		clone() {
				const result = new this.constructor();
				result.curves = [];
				for(let i = 0; i < this.curves.length; i++){
						result.curves.push(this.curves[i].clone());
				}
				result._type = this._type;
				return result;
		}
		quantize(precision) {
				precision = Math.max(precision, 2);
				const numCurves = this.curves.length;
				const values = new Float32Array(precision * numCurves);
				const step = 1.0 / (precision - 1);
				for(let c = 0; c < numCurves; c++){
						const ev = new CurveEvaluator(this.curves[c]);
						for(let i = 0; i < precision; i++){
								values[i * numCurves + c] = ev.evaluate(step * i);
						}
				}
				return values;
		}
		quantizeClamped(precision, min, max) {
				const result = this.quantize(precision);
				for(let i = 0; i < result.length; ++i){
						result[i] = Math.min(max, Math.max(min, result[i]));
				}
				return result;
		}
}

export { CurveSet };