/// <summary>
/// Select minimal need and apply it recursively for all coliding items
/// <remarks>
/// Notice that applying same need on all recursive collisions
/// is enough for state where no collision has been before
/// </remarks>
/// </summary>
/// <param name="need"></param>
/// <param name="itemToMove"></param>
private bool recursiveApplyNeed(Move need, DiagramItem itemToMove)
{
if (!need.HasStretchableDirection)
{
//we have to check if need appling is allowed
var possibilities = computePossibilities(itemToMove);
if (!need.IsSatisfiedBy(possibilities.GetMove(need.Direction)))
{
return(false);
}
}
var currentPosition = getPosition(itemToMove);
var newPosition = need.Apply(currentPosition);
trySetPosition(itemToMove, newPosition);
var collidingItems = _navigator.GetItemsInCollision(itemToMove).ToArray();
foreach (var collidingItem in collidingItems)
{
//for other coliding items apply same need
var hasSuccess = recursiveApplyNeed(need, collidingItem);
if (!hasSuccess)
{
return(false);
}
}
return(true);
}
internal void Arrange(IEnumerable <DiagramItem> arrangedItems)
{
//TODO use zGroups on container
var sortedItems = arrangedItems.OrderBy((item) => DiagramCanvasBase.GetZIndex(item));
_navigator = new SceneNavigator();
foreach (var item in sortedItems)
{
var collidingItems = _navigator.GetItemsInCollision(item).ToArray();
foreach (var colidingItem in collidingItems)
{
//move colliding items
moveCollidingItem(item, colidingItem);
}
_navigator.AddItem(item);
}
}
