/// <summary>
/// Returns the nearest ancestor terminal that is visible. The edge appears
/// to be connected to this terminal on the display.
/// </summary>
/// <param name="edge">Cell whose visible terminal should be returned.</param>
/// <param name="source">Boolean that specifies if the source or target terminal
/// should be returned.</param>
/// <returns>Returns the visible source or target terminal.</returns>
public Object GetVisibleTerminal(Object edge, bool source)
{
mxIGraphModel model = graph.Model;
Object result = model.GetTerminal(edge, source);
Object best = result;
while (result != null)
{
if (!graph.IsCellVisible(best) ||
graph.IsCellCollapsed(result))
{
best = result;
}
result = model.GetParent(result);
}
// Checks if the result is not a layer
if (model.GetParent(best) == model.Root)
{
best = null;
}
return(best);
}
/// <summary>
/// Validates the cell state for the given cell.
/// </summary>
/// <param name="cell">Cell whose cell state should be validated.</param>
/// <param name="recurse">Boolean indicating if the children of the cell should be
/// validated.</param>
/// <returns></returns>
public mxCellState ValidateCellState(Object cell, Boolean recurse)
{
mxCellState state = null;
if (cell != null)
{
state = GetState(cell);
if (state != null)
{
mxIGraphModel model = graph.Model;
if (state.Invalid)
{
state.Invalid = false;
ValidateCellState(model.GetParent(cell), false);
mxCellState source = ValidateCellState(GetVisibleTerminal(cell, true), false);
mxCellState target = ValidateCellState(GetVisibleTerminal(cell, false), false);
UpdateCellState(state, source, target);
if (model.IsEdge(cell) || model.IsVertex(cell))
{
UpdateLabelBounds(state);
UpdateBoundingBox(state);
}
}
if (recurse)
{
int childCount = model.GetChildCount(cell);
for (int i = 0; i < childCount; i++)
{
ValidateCellState(model.GetChildAt(cell, i));
}
}
}
}
return(state);
}
/// <summary>
/// Updates the given cell state.
/// </summary>
/// <param name="state"></param>
public void UpdateCellState(mxCellState state, mxCellState source, mxCellState target)
{
state.AbsoluteOffset.X = 0;
state.AbsoluteOffset.Y = 0;
state.Origin.X = 0;
state.Origin.Y = 0;
state.Length = 0;
mxIGraphModel model = graph.Model;
mxCellState pState = GetState(model.GetParent(state.Cell));
if (pState != null)
{
state.Origin.X += pState.Origin.X;
state.Origin.Y += pState.Origin.Y;
}
mxPoint offset = graph.GetChildOffsetForCell(state.Cell);
if (offset != null)
{
state.Origin.X += offset.X;
state.Origin.Y += offset.Y;
}
mxGeometry geo = graph.GetCellGeometry(state.Cell);
if (geo != null)
{
if (!model.IsEdge(state.Cell))
{
mxPoint origin = state.Origin;
offset = geo.Offset;
if (offset == null)
{
offset = EMPTY_POINT;
}
if (geo.Relative && pState != null)
{
if (model.IsEdge(pState.Cell))
{
mxPoint orig = GetPoint(pState, geo);
if (orig != null)
{
origin.X += (orig.X / scale) - pState.Origin.X - translate.X;
origin.Y += (orig.Y / scale) - pState.Origin.Y - translate.Y;
}
}
else
{
origin.X += geo.X * pState.Width / scale + offset.X;
origin.Y += geo.Y * pState.Height / scale + offset.Y;
}
}
else
{
state.AbsoluteOffset = new mxPoint(scale * offset.X,
scale * offset.Y);
origin.X += geo.X;
origin.Y += geo.Y;
}
}
state.X = scale * (translate.X + state.Origin.X);
state.Y = scale * (translate.Y + state.Origin.Y);
state.Width = scale * geo.Width;
state.Height = scale * geo.Height;
if (model.IsVertex(state.Cell))
{
UpdateVertexState(state, geo);
}
if (model.IsEdge(state.Cell))
{
UpdateEdgeState(state, geo, source, target);
}
}
}
/// <summary>
/// Validates the points for the state of the given cell recursively if the
/// cell is not collapsed and returns the bounding box of all visited states
/// as a rectangle.
/// </summary>
public mxRectangle ValidatePoints(mxCellState parentState, Object cell)
{
mxIGraphModel model = graph.Model;
mxCellState state = GetState(cell);
mxRectangle bbox = null;
if (state != null)
{
mxGeometry geo = graph.GetCellGeometry(cell);
if (geo != null && model.IsEdge(cell))
{
// Updates the points on the source terminal if its an edge
mxCellState source = GetState(GetVisibleTerminal(cell, true));
if (source != null && model.IsEdge(source.Cell) &&
!model.IsAncestor(source, cell))
{
mxCellState tmp = GetState(model.GetParent(source.Cell));
ValidatePoints(tmp, source.Cell);
}
// Updates the points on the target terminal if its an edge
mxCellState target = GetState(GetVisibleTerminal(cell, false));
if (target != null && model.IsEdge(target.Cell) &&
!model.IsAncestor(target.Cell, cell))
{
mxCellState tmp = GetState(model.GetParent(target.Cell));
ValidatePoints(tmp, target.Cell);
}
UpdateFixedTerminalPoints(state, source, target);
UpdatePoints(state, geo.Points, source, target);
UpdateFloatingTerminalPoints(state, source, target);
UpdateEdgeBounds(state);
state.AbsoluteOffset = GetPoint(state, geo);
}
else if (geo != null &&
geo.Relative &&
parentState != null &&
model.IsEdge(parentState.Cell))
{
mxPoint origin = GetPoint(parentState, geo);
if (origin != null)
{
state.X = origin.X;
state.Y = origin.Y;
origin.X = (origin.X / scale) - translate.X;
origin.Y = (origin.Y / scale) - translate.Y;
state.Origin = origin;
childMoved(parentState, state);
}
}
if (model.IsEdge(cell) || model.IsVertex(cell))
{
UpdateLabelBounds(state);
bbox = new mxRectangle(UpdateBoundingBox(state));
}
}
if (state != null && !graph.IsCellCollapsed(cell))
{
int childCount = model.GetChildCount(cell);
for (int i = 0; i < childCount; i++)
{
Object child = model.GetChildAt(cell, i);
mxRectangle bounds = ValidatePoints(state, child);
if (bounds != null)
{
if (bbox == null)
{
bbox = bounds;
}
else
{
bbox.Add(bounds);
}
}
}
}
return(bbox);
}
