/// <summary>
/// Called when a change of ActualTarget occurs. Recalculates ActualSource based on the new value.
/// </summary>
/// <param name="newActualTarget">The new ActualTarget.</param>
private void OnActualTargetChanged(NPoint newActualTarget)
{
// only perform recalculation if no target has been set previously
if (TargetNodePos == null)
{
switch (_sourceType)
{
case NodeType.Place:
ActualSource = CalculatePlaceIntersection(SourceNodePos, newActualTarget);
break;
case NodeType.Transition:
ActualSource = CalculateTransIntersection(SourceNodePos, newActualTarget);
break;
default:
break;
}
}
AdjustPositioning();
}
/// <summary>
/// Called when a change of TargetNodePos occurs. Recalculates ActualTarget and ActualSource based
/// on the new value.
/// </summary>
/// <param name="newTargetNodePos">The new TargetNodePos.</param>
private void OnTargetNodePosChanged(NPoint newTargetNodePos)
{
if (IsValid)
{
switch (_sourceType)
{
case NodeType.Place:
ActualTarget = CalculateTransIntersection(newTargetNodePos, SourceNodePos);
ActualSource = CalculatePlaceIntersection(SourceNodePos, newTargetNodePos);
break;
case NodeType.Transition:
ActualTarget = CalculatePlaceIntersection(newTargetNodePos, SourceNodePos);
ActualSource = CalculateTransIntersection(SourceNodePos, newTargetNodePos);
break;
default:
break;
}
// calculate minimum distance between node presentations for the VisualArc to remain visible
double minimumDistance = Calculations.GetDistance(SourceNodePos, ActualSource) +
Calculations.GetDistance(newTargetNodePos, ActualTarget);
double distance = Calculations.GetDistance(SourceNodePos, newTargetNodePos);
if (distance < minimumDistance)
Visible = false;
else
Visible = true;
}
}
/// <summary>
/// Performs initialization for a node move operation.
/// </summary>
/// <param name="dragSourceId">The id of the visual node that requested the operation.</param>
/// <param name="coords">The coordinates at which the node move has been initiated.</param>
private void InitializeNodeMove(String dragSourceId, Point coords)
{
IVisualNode node = ElementProvider.GetNode(dragSourceId);
DragStart = new NPoint(coords.X, coords.Y);
node.IsDragSource = true;
DragSourceId = dragSourceId;
UndoManager.MoveUndoViewSize = new Point(ViewWidth, ViewHeight);
UndoManager.MoveUndoStart = new Point(node.XPos, node.YPos);
}
