// m.vanish.length >= 2, first capture gives direction
const ref = (Math.abs(m.vanish[1].x - m.start.x) == 1 ? m.start : m.end);
const step = [m.vanish[1].x - ref.x, m.vanish[1].y - ref.y];
// m.vanish.length >= 2, first capture gives direction
const ref = (Math.abs(m.vanish[1].x - m.start.x) == 1 ? m.start : m.end);
const step = [m.vanish[1].x - ref.x, m.vanish[1].y - ref.y];
- step[0] / Math.abs(step[0]),
- step[1] / Math.abs(step[1])
+ multStep * step[0] / Math.abs(step[0]),
+ multStep * step[1] / Math.abs(step[1])