private void DrawTransitionFromPointToPoint(TransitionViewData transitionViewData, Vector2 point, Vector2 targetPoint, TransitionViewStyle style)
{
Color transitionColor = TransitionViewStyleUtil.GetColor(style);
GUIStyle transitionArrowStyle = TransitionViewStyleUtil.GetArrowStyle(style);
Vector2 offset = targetPoint - point;
// ex. A ---> B == Direction.RIGHT
Direction offsetDirection = DirectionUtil.ConvertVector2(offset);
// ex. (Direction.RIGHT).Vector2Value() == Vector2(1.0f, 0.0f)
Vector2 nodeTangent = Vector2.Scale(offsetDirection.Vector2Value(), Vector2Util.Abs(offset) * kTransitionTangentMultiplier);
Vector2 targetNodeTangent = -nodeTangent;
Handles.DrawBezier(point,
targetPoint,
point + nodeTangent,
targetPoint + targetNodeTangent,
transitionColor,
null,
kTransitionLineWidth);
Vector3[] bezierPoints = Handles.MakeBezierPoints(point,
targetPoint,
point + nodeTangent,
targetPoint + targetNodeTangent,
division: 40);
int midPointIndex = Mathf.FloorToInt(bezierPoints.Length / 2.0f);
Vector2 midPointTangent = bezierPoints[midPointIndex + 1] - bezierPoints[midPointIndex];
Vector2 midPoint = (point + targetPoint) / 2.0f;
float rotationAngle = Vector2.Angle(Vector2.right, midPointTangent);
if (midPointTangent.y < 0.0f)
{
rotationAngle *= -1.0f;
}
GUIUtility.RotateAroundPivot(rotationAngle, midPoint);
GUI.Box(RectUtil.MakeRect(midPoint, new Vector2(10.0f, 10.0f), pivot: new Vector2(0.5f, 0.5f)), "", transitionArrowStyle);
GUIUtility.RotateAroundPivot(-rotationAngle, midPoint);
}