Example of simple 2 step processing you can run on raw points in a drawing program

points_processing.js

function rdp_find_max(points, start, end) {
    const EPS = 0.5;
    let result = -1;
    let max_dist = 0;

    const a = points[start];
    const b = points[end];

    const dx = b.x - a.x;
    const dy = b.y - a.y;

    const dist_ab = Math.sqrt(dx * dx + dy * dy);
    const sin_theta = dy / dist_ab;
    const cos_theta = dx / dist_ab;

    for (let i = start; i < end; ++i) {
        const p = points[i];
        
        const ox = p.x - a.x;
        const oy = p.y - a.y;

        const rx = cos_theta * ox + sin_theta * oy;
        const ry = -sin_theta * ox + cos_theta * oy;

        const x = rx + a.x;
        const y = ry + a.y;

        const dist = Math.abs(y - a.y);

        if (dist > EPS && dist > max_dist) {
            result = i;
            max_dist = dist;
        }
    }

    return result;
}

function process_rdp_r(points, start, end) {
    let result = [];
    
    const max = rdp_find_max(points, start, end);

    if (max !== -1) {
        const before = process_rdp_r(points, start, max);
        const after = process_rdp_r(points, max, end);
        result = [...before, points[max], ...after];
    }

    return result;
}

function process_rdp(points) {
    const result = process_rdp_r(points, 0, points.length - 1);
    result.unshift(points[0]);
    result.push(points[points.length - 1]);
    return result;
}

function process_ewmv(points) {
    const result = [];
    const alpha = 0.4;

    result.push(points[0]);

    for (let i = 1; i < points.length; ++i) {
        const p = points[i];
        const x = alpha * p.x + (1 - alpha) * result[result.length - 1].x;
        const y = alpha * p.y + (1 - alpha) * result[result.length - 1].y;
        result.push({'x': x, 'y': y});
    }

    return result;
}

function process_stroke(points) {
    const result0 = process_ewmv(points);
    const result1 = process_rdp(result0);
    return result1;
}