text: export default function(a, b, l, v) {
    const points = [];
    for(let i=0;i<l;i++) { // for each point
      points[i] = [];
      for(let j=0;j<2;j++) { // each point coordinate
        points[i].push( ((a[i][j]+(b[i][j]-a[i][j])*v) * 1000 >> 0)/1000 );
      }
    }
    return points;
  }