// Set x,y,width,height of each Node
public static CanvasDefinition GenerateLayout(
IList <Node> Nodes,
double Padding,
CanvasDefinition.LayoutDirection Direction = CanvasDefinition.LayoutDirection.LeftToRight
)
{
CanvasDefinition Canvas = null;
if (Nodes == null || Nodes.Count == 0)
{
return(null);
}
var RootNodes = from n in Nodes
where n.ParentNodes.Count == 0
select n;
if (RootNodes != null)
{
#region Assign individual Node to slots, and update Node.x/Node.y
GridSizingInfo SizingInfo = GenerateGraph(RootNodes, Direction, Padding);
Canvas = new CanvasDefinition()
{
Direction = Direction
};
Canvas.NumSlotsHorizontal = (from Entry in SizingInfo.MaxColumnWidths
select Entry.Value).Count();
Canvas.NumSlotsVertical = (from Entry in SizingInfo.MaxRowHeights
select Entry.Value).Count();
Canvas.Width = (from Entry in SizingInfo.MaxColumnWidths
select Entry.Value).Sum() + Canvas.NumSlotsHorizontal * Padding;
Canvas.Height = (from Entry in SizingInfo.MaxRowHeights
select Entry.Value).Sum() + Canvas.NumSlotsVertical * Padding;
#endregion
}
else
{
throw new ArgumentException("There must be at least one root node");
}
return(Canvas);
}
protected static GridSizingInfo GenerateGraph(
IEnumerable <Node> RootNodes,
CanvasDefinition.LayoutDirection Direction,
double Padding)
{
int i = 0;
int j = 0;
GridSizingInfo SizingInfo = new GridSizingInfo();
foreach (Node RootNode in RootNodes)
{
RootNode.Width = RootNode.Width * 1.25;
RootNode.Height = RootNode.Height * 1.25;
}
RecursiveGenerateGrid(RootNodes, SizingInfo, Direction, i, j);
RecursivePositionSlots(RootNodes, SizingInfo, Direction, Padding);
return(SizingInfo);
}
// Employ "Depth First" strategy (As supposed to "Breath First")
protected static void RecursiveGenerateGrid(
IEnumerable <Node> Nodes,
GridSizingInfo SizingInfo,
CanvasDefinition.LayoutDirection Direction,
int i, int j)
{
int NumDecendantsLeaveNodes = 0;
foreach (Node n in Nodes)
{
NumDecendantsLeaveNodes = FindNumDecendantsLeaveNodes(n);
#region Set Slot
switch (Direction)
{
case CanvasDefinition.LayoutDirection.LeftToRight:
n.xSlot = i;
n.ySlot = j;
SizingInfo.UpdateSizingInfo(n);
RecursiveGenerateGrid(n.ChildNodes, SizingInfo, Direction, i + 1, j);
j += NumDecendantsLeaveNodes > 0 ? NumDecendantsLeaveNodes : 1;
break;
case CanvasDefinition.LayoutDirection.TopToBottom:
n.xSlot = i;
n.ySlot = j;
SizingInfo.UpdateSizingInfo(n);
RecursiveGenerateGrid(n.ChildNodes, SizingInfo, Direction, i, j + 1);
i += NumDecendantsLeaveNodes > 0 ? NumDecendantsLeaveNodes : 1;
break;
}
#endregion
}
return;
}
protected static void RecursivePositionSlots(
IEnumerable <Node> Nodes,
GridSizingInfo SizingInfo,
CanvasDefinition.LayoutDirection Direction,
double Padding
)
{
double CumulativeWidth = 0;
double CumulativeHeight = 0;
foreach (Node n in Nodes)
{
#region Set Slot Position
CumulativeWidth = 0;
CumulativeHeight = 0;
CumulativeWidth = 0;
for (int i = 0; i < n.xSlot; i++)
{
CumulativeWidth += (SizingInfo.MaxColumnWidths[i] + Padding);
}
for (int j = 0; j < n.ySlot; j++)
{
CumulativeHeight += (SizingInfo.MaxRowHeights[j] + Padding);
}
n.x = CumulativeWidth;
n.y = CumulativeHeight;
if (n.ChildNodes.Count > 0)
{
#region Center node alignment
double Offset = 0;
int k = 0;
switch (Direction)
{
case CanvasDefinition.LayoutDirection.LeftToRight:
double ChildNodeHeight = 0;
foreach (Node ChildNode in n.ChildNodes)
{
ChildNodeHeight = FindChildHeight(ChildNode, Padding);
if (k < n.ChildNodes.Count - 1)
{
Offset += (ChildNodeHeight + Padding);
}
else
{
Offset += (ChildNodeHeight);
}
k++;
}
Offset -= (n.Height);
n.y += (Offset / 2.0);
break;
case CanvasDefinition.LayoutDirection.TopToBottom:
double ChildNodeWidth = 0;
foreach (Node ChildNode in n.ChildNodes)
{
ChildNodeWidth = FindChildWidth(ChildNode, Padding);
if (k < n.ChildNodes.Count - 1)
{
Offset += (ChildNodeWidth + Padding);
}
else
{
Offset += (ChildNodeWidth);
}
k++;
}
Offset -= (n.Width);
n.x += (Offset / 2.0);
break;
}
#endregion
}
RecursivePositionSlots(n.ChildNodes, SizingInfo, Direction, Padding);
#endregion
}
return;
}
