private static void DrawTree(TreeNode treeNode, string file)
{
using (Metafile mf = new Metafile(file, Graphics.FromHwnd(IntPtr.Zero).GetHdc(), EmfType.EmfOnly))
{
using (Graphics graphics = Graphics.FromImage(mf))
{
graphics.PageUnit = GraphicsUnit.Point;
Font labelFont = new Font("SimSun", 9.0f, FontStyle.Regular, GraphicsUnit.Point);
DrawTreeContext context = new DrawTreeContext()
{
Graphics = graphics,
BorderPen = new Pen(Color.Black, 0.75f),
ConnectorPen = new Pen(Color.Black, 0.5f),
LabelBrush = Brushes.Black,
LabelFont = labelFont,
LabelHeight = labelFont.Size,
NodeHorizontalSep = 9.0,
NodeVerticalSep = 24.0,
NodeHorizontalPadding = 3.75,
NodeVerticalPadding = 3.75,
PreferCjk = true
};
treeNode.DrawTree(context, new PointD(treeNode.Layout(context).Pivot, 0.0));
}
}
}
private double MeasureNode(DrawTreeContext context)
{
double borderThickness = context.BorderPen == null ? 0.0 : context.BorderPen.Width;
nodeSize = new SizeD((context.NodeHorizontalPadding + borderThickness) * 2.0 + context.Graphics.MeasureString(Label, context.LabelFont, PointF.Empty, stringFormat).Width,
(context.NodeVerticalPadding + borderThickness) * 2.0 + context.LabelHeight);
return nodeSize.Width;
}
public TreeLayout Layout(DrawTreeContext context)
{
if (Children.Count == 0)
{
var nodeWidth = MeasureNode(context);
return new TreeLayout()
{
Width = nodeWidth,
Pivot = nodeWidth / 2.0,
RowWidths = { new TreeRowWidth(0.0, 0.0) }
};
}
else
{
var joinResult = TreeLayout.Join(Children.Select(n => n.Layout(context)).ToArray(), context.NodeHorizontalSep);
double pivot = (joinResult.Item4.First() + joinResult.Item4.Last()) / 2.0;
double nodeWidth = MeasureNode(context);
double nodeLeft = pivot - nodeWidth / 2.0;
double nodeRight = pivot + nodeWidth / 2.0;
double left = Math.Min(nodeLeft, joinResult.Item1);
double right = Math.Max(nodeRight, joinResult.Item2);
if (nodeLeft < joinResult.Item1)
{
foreach (var treeRowWidth in joinResult.Item3)
{
treeRowWidth.Left += joinResult.Item1 - nodeLeft;
}
}
if (nodeRight > joinResult.Item2)
{
foreach (var treeRowWidth in joinResult.Item3)
{
treeRowWidth.Right += nodeRight - joinResult.Item2;
}
}
joinResult.Item3.Insert(0, new TreeRowWidth(nodeLeft - left, right - nodeRight));
for (int i = 0; i < Children.Count; i++)
{
Children[i].offset = joinResult.Item4[i] - pivot;
}
return new TreeLayout()
{
Width = right - left,
Pivot = pivot - left,
RowWidths = joinResult.Item3
};
}
}
public void DrawTree(DrawTreeContext context, PointD location)
{
if (context.ConnectorPen != null && Children.Count > 0)
{
float nextY = (float)(location.Y + nodeSize.Height + context.NodeVerticalSep);
if (Children.Count == 1)
{
context.Graphics.DrawLine(context.ConnectorPen,
(float)location.X,
(float)(location.Y + nodeSize.Height),
(float)location.X,
nextY);
}
else if (Children.Count >= 2)
{
float branchY = (float)(location.Y + nodeSize.Height + context.NodeVerticalSep / 2.0);
context.Graphics.DrawLine(context.ConnectorPen,
(float)location.X,
(float)(location.Y + nodeSize.Height),
(float)location.X,
branchY);
context.Graphics.DrawLines(context.ConnectorPen, new[]
{
new PointF((float)(location.X + Children.First().offset), nextY),
new PointF((float)(location.X + Children.First().offset), branchY),
new PointF((float)(location.X + Children.Last().offset), branchY),
new PointF((float)(location.X + Children.Last().offset), nextY)
});
foreach (var treeNode in Children.Skip(1).Take(Children.Count - 2))
{
context.Graphics.DrawLine(context.ConnectorPen,
(float)(location.X + treeNode.offset),
branchY,
(float)(location.X + treeNode.offset),
nextY);
}
}
}
DrawNode(context, location);
foreach (var treeNode in Children)
{
treeNode.DrawTree(context, new PointD(location.X + treeNode.offset, location.Y + nodeSize.Height + context.NodeVerticalSep));
}
}
private void DrawNode(DrawTreeContext context, PointD location)
{
if (context.BorderPen != null)
{
RectangleD borderRect = new RectangleD(location.X - nodeSize.Width / 2.0 + context.BorderPen.Width / 2.0,
location.Y + context.BorderPen.Width / 2.0,
nodeSize.Width - context.BorderPen.Width,
nodeSize.Height - context.BorderPen.Width);
if (context.BackgroundBrush != null)
{
context.Graphics.FillRectangle(context.BackgroundBrush, borderRect);
}
context.Graphics.DrawRectangle(context.BorderPen,
(float)borderRect.X,
(float)borderRect.Y,
(float)borderRect.Width,
(float)borderRect.Height);
}
else
{
if (context.BackgroundBrush != null)
{
context.Graphics.FillRectangle(context.BackgroundBrush, new RectangleD(location, nodeSize));
}
}
if (context.PreferCjk)
{
stringFormat.LineAlignment = StringAlignment.Near;
context.Graphics.DrawString(Label,
context.LabelFont,
context.LabelBrush,
(float)location.X,
(float)(location.Y + (context.BorderPen == null ? 0.0 : context.BorderPen.Width) + context.NodeVerticalPadding),
stringFormat);
}
else
{
stringFormat.LineAlignment = StringAlignment.Center;
context.Graphics.DrawString(Label,
context.LabelFont,
context.LabelBrush,
(float)location.X,
(float)(location.Y + nodeSize.Height / 2.0),
stringFormat);
}
}