@stringsync/vexml/dist/esm/rendering/pen.js

MusicXML to Vexflow

import * as util from '../util';
import { Point } from '../spatial';
import { Stack } from '../util';
/**
 * Pen is a position tracker.
 *
 * The term "cursor" is overloaded in the codebase, so this is a simple alternative.
 */
export class Pen {
    positions = new Stack();
    constructor(initialPosition = Point.origin()) {
        this.positions.push(initialPosition);
    }
    get x() {
        return this.position().x;
    }
    get y() {
        return this.position().y;
    }
    position() {
        const position = this.positions.peek();
        util.assertDefined(position);
        return position;
    }
    moveTo(point) {
        this.positions.pop();
        this.positions.push(new Point(point.x, point.y));
    }
    moveBy(opts) {
        const dx = opts.dx ?? 0;
        const dy = opts.dy ?? 0;
        const position = this.position();
        this.moveTo({ x: position.x + dx, y: position.y + dy });
    }
    clone() {
        const pen = new Pen();
        pen.positions = this.positions.clone();
        return pen;
    }
    save() {
        this.positions.push(this.position());
    }
    restore() {
        if (this.positions.size() > 1) {
            this.positions.pop();
        }
    }
}