Rotated rectangle collision in Dart

//Dart Implementation for detecting collision of two rotated rectangles

class Collision {
  static bool collides(CollisionBox a, CollisionBox b) {
    //The getpoints function will return the coordinates of the box in this order:
    //0:topleft  1:topright  2:bottomright   3: bottomleft

    List<Vector2> A = a.getPoints();
    List<Vector2> B = b.getPoints();

    Vector2 Axis1 = new Vector2(A[1].x-A[0].x,A[1].y-A[0].y);
    Vector2 Axis2 = new Vector2(A[1].x-A[2].x,A[1].y-A[2].y);
    Vector2 Axis3 = new Vector2(B[0].x-B[3].x,B[0].y-B[3].y);
    Vector2 Axis4 = new Vector2(B[0].x-B[1].x,B[0].y-B[1].y);

    return _projectionOverlap(Axis1,A,B) &&
        _projectionOverlap(Axis2,A,B) &&
        _projectionOverlap(Axis3,A,B) &&
        _projectionOverlap(Axis4,A,B);
  }

  static bool _projectionOverlap (Vector2 v,List<Vector2> A, List<Vector2> B) {
    List aVal = _projectPoints(v,A);
    double aMin = aVal[0];
    double aMax = aVal[1];

    List bVal = _projectPoints(v,B);
    double bMin = bVal[0];
    double bMax = bVal[1];

    if (aMax < bMin || bMax < aMin)
      return false;
    else
      return true;
  }

  static List _projectPoints(Vector2 v, List<Vector2> A) {
    double aMin;
    double aMax;
    A.forEach((Vector2 p) {
      num val = (p.x*v.x)+(p.y*v.y); //dot product of p & v

      if (aMin == null) {
        aMin = val;
        aMax = val;
      } else {
        aMin = Math.min(val, aMin);
        aMax = Math.max(val, aMax);
      }

    });

    return [aMin,aMax];
  }
}