code: function getLengthAngle(x1, x2, y1, y2) {
    var xDiff = x2 - x1;
  
    var yDiff = y2 - y1;
  
    return {
      length: Math.ceil(Math.sqrt(xDiff * xDiff + yDiff * yDiff)),
      angle: Math.round(Math.atan2(yDiff, xDiff) * 180 / Math.PI)
    };
  }
docs: return height and angle for lines