/// <summary>
/// Get contact points defined for given item
/// <remarks>Note that because of simple getting contact points we store them as first four</remarks>.
/// </summary>
/// <param name="item">Item which points are generated.</param>
/// <returns>Generated points.</returns>
private IEnumerable <GraphPoint> generatePoints(DiagramItem item)
{
var span = SceneNavigator.GetSpan(item, item.GlobalPosition);
var topLeft = new GraphPoint(span.TopLeft, TopLeftCorner, item);
var topRight = new GraphPoint(span.TopRight, TopRightCorner, item);
var bottomLeft = new GraphPoint(span.BottomLeft, BottomLeftCorner, item);
var bottomRight = new GraphPoint(span.BottomRight, BottomRightCorner, item);
topLeft.SetEdgeStatus(topRight);
topLeft.SetEdgeStatus(bottomLeft);
bottomRight.SetEdgeStatus(topRight);
bottomRight.SetEdgeStatus(bottomLeft);
var points = new List <GraphPoint>();
points.Add(topLeft);
points.Add(topRight);
points.Add(bottomLeft);
points.Add(bottomRight);
generateConnectorPoints(item.TopConnectorDrawings, ConnectorAlign.Top, item, points);
generateConnectorPoints(item.LeftConnectorDrawings, ConnectorAlign.Left, item, points);
generateConnectorPoints(item.BottomConnectorDrawings, ConnectorAlign.Bottom, item, points);
generateConnectorPoints(item.RightConnectorDrawings, ConnectorAlign.Right, item, points);
return(points);
}
/// <summary>
/// Compute possibilities of movedItem to move without overlapping any other item
/// </summary>
/// <param name="movedItem">Item which possibilities are created</param>
/// <returns>Computed possibilities</returns>
private ItemMoveability computePossibilities(DiagramItem movedItem)
{
if (movedItem.IsRootItem)
{
return(new ItemMoveability(double.PositiveInfinity, double.PositiveInfinity, double.PositiveInfinity, double.PositiveInfinity));
}
var container = movedItem.ContainingDiagramCanvas;
//we have to check possibilities relative to parent!
//so using relative position is necessary
var currentPosition = getPosition(movedItem);
var currentLocalPosition = movedItem.AsLocalPosition(currentPosition);
var span = SceneNavigator.GetSpan(movedItem, currentLocalPosition);
var contMargin = container.Margin;
var upPossib = span.Top;
var downPossib = container.DesiredSize.Height - span.Bottom - contMargin.Bottom - contMargin.Top;
var rightPossib = container.DesiredSize.Width - span.Right - contMargin.Right - contMargin.Left;
var leftPossib = span.Left;
return(new ItemMoveability(
upPossib,
downPossib,
leftPossib,
rightPossib
));
}
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);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="JoinGraph"/> class.
/// </summary>
/// <param name="navigator">The navigator.</param>
internal JoinGraph(SceneNavigator navigator)
{
_navigator = navigator;
}
private Rect getLocalSpan(DiagramItem item)
{
return(SceneNavigator.GetSpan(item, item.LocalPosition));
}
