@tokens-studio/graph-engine/dist/nodes/curves/sample.js

An execution engine to handle Token Studios generators and resolvers

import { CurveSchema, NumberSchema, Vec2Schema } from '../../schemas/index.js';
import { Node } from '../../programmatic/node.js';
const scaleVec = (vec, scale) => vec.map(v => v * scale);
const addVec = (vec1, vec2) => vec1.map((v, i) => v + vec2[i]);
const sampleBezier = (bezier, sample) => {
    const { points } = bezier;
    const [a, b, c, d] = points;
    return [
        scaleVec(a, -(sample ** 3) + 3 * sample ** 2 - 3 * sample + 1),
        scaleVec(b, 3 * sample ** 3 - 6 * sample ** 2 + 3 * sample),
        scaleVec(c, -3 * sample ** 3 + 3 * sample ** 2),
        scaleVec(d, sample ** 3)
    ].reduce(addVec, [0, 0]);
};
export default class NodeDefinition extends Node {
    static title = 'Sample Curve';
    static type = 'studio.tokens.curve.sample';
    static description = 'Samples a curve at a specified point';
    constructor(props) {
        super(props);
        this.addInput('curve', {
            type: CurveSchema
        });
        this.addInput('sample', {
            type: {
                ...NumberSchema,
                default: 0.5
            }
        });
        this.addOutput('value', {
            type: Vec2Schema
        });
        this.addOutput('x', {
            type: NumberSchema
        });
        this.addOutput('y', {
            type: NumberSchema
        });
    }
    execute() {
        const { curve, sample } = this.getAllInputs();
        //TODO this currently assumes that the curve is purely just beziers
        //First look for the bezier that contains the sample
        const foundCurve = curve.curves.find(piece => piece.points[0][0] <= sample &&
            piece.points[piece.points.length - 1][0] >= sample);
        if (!foundCurve)
            throw new Error('No curve found for sample');
        const output = sampleBezier(foundCurve, sample);
        this.outputs.value.set(output);
        this.outputs.x.set(output[0]);
        this.outputs.y.set(output[1]);
    }
}
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