[CustomEditor(typeof(PathCreator))]
public class PathEditor : Editor {

PathCreator creator;
Path path;
Path subPath;
float curveLengthValue = 1.0f;


void OnEnable()
{
    creator = (PathCreator)target;
    if (creator.path == null)
    {
        creator.CreatePath();
    }
    path = creator.path;
    subPath = new Path(creator.transform.position);

}

public override void OnInspectorGUI()
{
    base.OnInspectorGUI();
    EditorGUI.BeginChangeCheck();

    bool continuousControlPoints = GUILayout.Toggle(path.isContinuous, "Set Continuous Control Points");
    if (continuousControlPoints != path.isContinuous)
    {
        Undo.RecordObject(creator, "Toggle set continuous controls");
        path.isContinuous = continuousControlPoints;
    }

          bool symmetricControlPoints = GUILayout.Toggle(path.isSymmetric, "Symmetric Control Points");
        if (symmetricControlPoints != path.isSymmetric)
        {
            Undo.RecordObject(creator, "Toggle set symmetric controls");
            path.isSymmetric = symmetricControlPoints;
        }


    // HERE IS WHERE I HANDLE THE BEZIER SIZE SLIDER
    if (symmetricControlPoints)
            {
                curveLengthValue = EditorGUILayout.Slider("Curve Length", creator.curveSizeValue, 0.0f, 1.0f);

                if (!Mathf.Approximately(creator.curveSizeValue, curveLengthValue))
                {
                    subPath = PathIntervalFromTo(path, 0.5f - 0.5f * curveLengthValue, 0.5f + 0.5f * curveLengthValue, 0); //I'm not sure how to set the subPath so it draws the LineRenderer and responds to symmetry and continuity bools above

                    creator.curveSizeValue = curveLengthValue;
                }
            }

if (EditorGUI.EndChangeCheck())
    {
        SceneView.RepaintAll();
    }
}

static Path IntervalFromTo(Path curve, float start, float end, int segIndex)
    {

        float oneMinusStart = 1f - start;
        float oneMinusEnd = 1f - end;
        float scale = (end - start) / 3f;

        var a =
            oneMinusStart * oneMinusStart * oneMinusStart * curve.GetPointsInSegment(segIndex)[0] +
            3f * oneMinusStart * oneMinusStart * start * curve.GetPointsInSegment(segIndex)[1] +
            3f * oneMinusStart * start * start * curve.GetPointsInSegment(segIndex)[2] +
            start * start * start * curve.GetPointsInSegment(segIndex)[3];

        var b = a + (3f * oneMinusStart * oneMinusStart * (curve.GetPointsInSegment(segIndex)[1] - curve.GetPointsInSegment(segIndex)[0]) +
                     6 * start * oneMinusStart * (curve.GetPointsInSegment(segIndex)[2] - curve.GetPointsInSegment(segIndex)[1]) +
                     3 * start * start * (curve.GetPointsInSegment(segIndex)[3] - curve.GetPointsInSegment(segIndex)[2])) * scale;

        var d = oneMinusEnd * oneMinusEnd * oneMinusEnd * curve.GetPointsInSegment(segIndex)[0] +
            3f * oneMinusEnd * oneMinusEnd * end * curve.GetPointsInSegment(segIndex)[1] +
            3f * oneMinusEnd * end * end * curve.GetPointsInSegment(segIndex)[2] +
            end * end * end * curve[3];

        var c = d - (3f * oneMinusEnd * oneMinusEnd * (curve.GetPointsInSegment(segIndex)[1] - curve.GetPointsInSegment(segIndex)[0]) +
                     6 * end * oneMinusEnd * (curve.GetPointsInSegment(segIndex)[2] - curve.GetPointsInSegment(segIndex)[1]) +
                     3 * end * end * (curve.GetPointsInSegment(segIndex)[3] - curve.GetPointsInSegment(segIndex)[2])) * scale;

        return curve;
    }


void OnSceneGUI()
{
	Handles.matrix = creator.transform.localToWorldMatrix;
    handleRotation = Tools.pivotRotation == PivotRotation.Local ? creator.transform.rotation : Quaternion.identity;

    Input();
    Draw();
}

void Input()
 {
    Event guiEvent = Event.current;
    Vector2 mousePos = HandleUtility.GUIPointToWorldRay(guiEvent.mousePosition).origin;

    if (guiEvent.type == EventType.MouseDown && guiEvent.button == 0 && guiEvent.shift)
    {
        Undo.RecordObject(creator, "Add segment");
        path.AddSegment(mousePos);
    }
}

void Draw()
{

    for (int i = 0; i < path.NumSegments; i++)
    {
        Vector2[] points = path.GetPointsInSegment(i);
        Handles.color = Color.black;
        Handles.DrawLine(points[1], points[0]);
        Handles.DrawLine(points[2], points[3]);
        Handles.DrawBezier(points[0], points[3], points[1], points[2], Color.green, null, 2);
    }

     creator.DrawBezierCurve(); // HANDLES DRAWING OF LINERENDERER FOR BEZIER CURVE
    Handles.color = Color.red;
    for (int i = 0; i < path.NumPoints; i++)
    {
        Vector2 newPos = Handles.FreeMoveHandle(path[i], Quaternion.identity, .1f, Vector2.zero, Handles.CylinderHandleCap);
        if (path[i] != newPos)
        {
            Undo.RecordObject(creator, "Move point");
            path.MovePoint(i, newPos);
        }
    }
}


}