@cantoo/pdf-lib/es/utils/elements/Plot.js

Create and modify PDF files with JavaScript

import { plus } from '../maths.js';
import GraphElement from './GraphElement.js';
import Point from './Point.js';
import Segment from './Segment.js';
export default class Plot extends GraphElement {
    constructor(points = []) {
        super();
        this.points = points;
    }
    getPoints() {
        return [...this.points];
    }
    translate(translationVector) {
        this.points = this.points.map((point) => plus(point, translationVector));
    }
    isEqual(element) {
        if (!(element instanceof Plot))
            return false;
        const points = this.getPoints().map((coord) => new Point(coord));
        const points2 = element.getPoints().map((coord) => new Point(coord));
        return (points.every((point, i) => point.isEqual(points2[i])) ||
            points.reverse().every((point, i) => point.isEqual(points2[i])));
    }
    orthoProjection(P) {
        const points = this.getPoints();
        const orthos = points
            .slice(0, -1)
            .map((pt, i) => new Segment(new Point(pt), new Point(points[i + 1])))
            .map((seg) => seg.orthoProjection(P));
        let min = Number.POSITIVE_INFINITY;
        let closest = new Point(points[0]);
        orthos.forEach((ortho) => {
            const d = ortho.distance(P);
            if (d < min) {
                min = d;
                closest = ortho;
            }
        });
        return closest;
    }
}
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