protected void DrawTreeNode(Graphics graphics, VisualTreeNode <ISymbolicExpressionTreeNode> visualTreeNode)
{
graphics.Clip = new Region(new Rectangle(visualTreeNode.X, visualTreeNode.Y, visualTreeNode.Width + 1, visualTreeNode.Height + 1));
graphics.Clear(backgroundColor);
var node = visualTreeNode.Content;
using (var textBrush = new SolidBrush(visualTreeNode.TextColor))
using (var nodeLinePen = new Pen(visualTreeNode.LineColor))
using (var nodeFillBrush = new SolidBrush(visualTreeNode.FillColor)) {
var x = visualTreeNode.X;
var y = visualTreeNode.Y;
var w = visualTreeNode.Width - 1; // allow 1px for the drawing of the line
var h = visualTreeNode.Height - 1; // allow 1px for the drawing of the line
// draw leaf nodes as rectangles and internal nodes as ellipses
if (node.SubtreeCount > 0)
{
fill = graphics.FillEllipse; draw = graphics.DrawEllipse;
}
else
{
fill = graphics.FillRectangle; draw = graphics.DrawRectangle;
}
fill(nodeFillBrush, x, y, w, h);
draw(nodeLinePen, x, y, w, h);
//draw name of symbol
graphics.DrawString(node.ToString(), textFont, textBrush, new RectangleF(x, y, w, h), stringFormat);
}
}
protected void DrawTreeNode(Graphics graphics, VisualTreeNode <ISymbolicExpressionTreeNode> visualTreeNode)
{
graphics.Clip = new Region(new Rectangle(visualTreeNode.X, visualTreeNode.Y, visualTreeNode.Width + 1, visualTreeNode.Height + 1));
graphics.Clear(backgroundColor);
var node = visualTreeNode.Content;
using (var textBrush = new SolidBrush(visualTreeNode.TextColor))
using (var nodeLinePen = new Pen(visualTreeNode.LineColor))
using (var nodeFillBrush = new SolidBrush(visualTreeNode.FillColor)) {
//draw terminal node
if (node.SubtreeCount == 0)
{
graphics.FillRectangle(nodeFillBrush, visualTreeNode.X, visualTreeNode.Y, visualTreeNode.Width, visualTreeNode.Height);
graphics.DrawRectangle(nodeLinePen, visualTreeNode.X, visualTreeNode.Y, visualTreeNode.Width, visualTreeNode.Height);
}
else
{
graphics.FillEllipse(nodeFillBrush, visualTreeNode.X, visualTreeNode.Y, visualTreeNode.Width, visualTreeNode.Height);
graphics.DrawEllipse(nodeLinePen, visualTreeNode.X, visualTreeNode.Y, visualTreeNode.Width, visualTreeNode.Height);
}
//draw name of symbol
var text = node.ToString();
graphics.DrawString(text, textFont, textBrush, new RectangleF(visualTreeNode.X, visualTreeNode.Y, visualTreeNode.Width, visualTreeNode.Height), stringFormat);
}
}
protected virtual void SymbolicExpressionTreeChart_MouseDoubleClick(object sender, MouseEventArgs e)
{
VisualTreeNode <ISymbolicExpressionTreeNode> visualTreeNode = FindVisualSymbolicExpressionTreeNodeAt(e.X, e.Y);
if (visualTreeNode != null)
{
OnSymbolicExpressionTreeNodeDoubleClicked(visualTreeNode, e);
}
}
public void RepaintNode(VisualTreeNode <ISymbolicExpressionTreeNode> visualNode)
{
if (!suspendRepaint)
{
using (var graphics = Graphics.FromImage(image)) {
graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
DrawTreeNode(graphics, visualNode);
}
this.Refresh();
}
}
protected void DrawLine(Graphics graphics, VisualTreeNode <ISymbolicExpressionTreeNode> startNode, VisualTreeNode <ISymbolicExpressionTreeNode> endNode)
{
var origin = new Point(startNode.X + startNode.Width / 2, startNode.Y + startNode.Height);
var target = new Point(endNode.X + endNode.Width / 2, endNode.Y);
graphics.Clip = new Region(new Rectangle(Math.Min(origin.X, target.X), origin.Y, Math.Max(origin.X, target.X), target.Y));
var visualLine = GetVisualSymbolicExpressionTreeNodeConnection(startNode.Content, endNode.Content);
using (var linePen = new Pen(visualLine.LineColor)) {
linePen.DashStyle = visualLine.DashStyle;
graphics.DrawLine(linePen, origin, target);
}
}
private void RecursiveLayout(Dictionary <T, VisualTreeNode <T> > nodeMap, VisualTreeNode <T> visualTreeNode, int x, int y, int width, int height)
{
float center_x = x + width / 2;
float center_y = y + height / 2;
int actualWidth = width - HorizontalSpacing;
int actualHeight = height - VerticalSpacing;
//calculate size of node
if (actualWidth >= visualTreeNode.PreferredWidth && actualHeight >= visualTreeNode.PreferredHeight)
{
visualTreeNode.Width = visualTreeNode.PreferredWidth;
visualTreeNode.Height = visualTreeNode.PreferredHeight;
visualTreeNode.X = (int)center_x - visualTreeNode.Width / 2;
visualTreeNode.Y = (int)center_y - visualTreeNode.Height / 2;
}
//width too small to draw in desired sized
else if (actualWidth < visualTreeNode.PreferredWidth && actualHeight >= visualTreeNode.PreferredHeight)
{
visualTreeNode.Width = actualWidth;
visualTreeNode.Height = visualTreeNode.PreferredHeight;
visualTreeNode.X = x;
visualTreeNode.Y = (int)center_y - visualTreeNode.Height / 2;
}
//height too small to draw in desired sized
else if (actualWidth >= visualTreeNode.PreferredWidth && actualHeight < visualTreeNode.PreferredHeight)
{
visualTreeNode.Width = visualTreeNode.PreferredWidth;
visualTreeNode.Height = actualHeight;
visualTreeNode.X = (int)center_x - visualTreeNode.Width / 2;
visualTreeNode.Y = y;
}
//width and height too small to draw in desired size
else
{
visualTreeNode.Width = actualWidth;
visualTreeNode.Height = actualHeight;
visualTreeNode.X = x;
visualTreeNode.Y = y;
}
//calculate areas for the subtrees according to their tree size
var node = visualTreeNode.Content;
var children = GetChildren(node).ToList();
int[] xBoundaries = new int[children.Count + 1];
xBoundaries[0] = x;
for (int i = 0; i < children.Count; i++)
{
xBoundaries[i + 1] = (int)(xBoundaries[i] + (width * (double)GetLength(children[i])) / (GetLength(node) - 1));
RecursiveLayout(nodeMap, nodeMap[children[i]], xBoundaries[i], y + height, xBoundaries[i + 1] - xBoundaries[i], height);
}
}
private void CreateVisualNodes(T root, Dictionary <T, VisualTreeNode <T> > map)
{
var node = new VisualTreeNode <T>(root)
{
PreferredWidth = NodeWidth,
PreferredHeight = NodeHeight
};
map.Add(root, node);
var children = GetChildren(root).ToList();
if (children.Any())
{
foreach (var child in children)
{
CreateVisualNodes(child, map);
}
}
}
private void SymbolicExpressionTreeChart_MouseMove(object sender, MouseEventArgs e)
{
VisualTreeNode <ISymbolicExpressionTreeNode> visualTreeNode = FindVisualSymbolicExpressionTreeNodeAt(e.X, e.Y);
if (draggedSymbolicExpressionTree != null &&
draggedSymbolicExpressionTree != visualTreeNode)
{
OnSymbolicExpressionTreeNodeDragDrag(draggedSymbolicExpressionTree, new ItemDragEventArgs(dragButtons, draggedSymbolicExpressionTree));
draggedSymbolicExpressionTree = null;
}
else if (draggedSymbolicExpressionTree == null &&
visualTreeNode != null)
{
string tooltipText = visualTreeNode.ToolTip;
if (this.toolTip.GetToolTip(this) != tooltipText)
{
this.toolTip.SetToolTip(this, tooltipText);
}
}
else if (visualTreeNode == null)
{
this.toolTip.SetToolTip(this, "");
}
}
private void SymbolicExpressionTreeChart_MouseUp(object sender, MouseEventArgs e)
{
this.draggedSymbolicExpressionTree = null;
this.dragButtons = MouseButtons.None;
}
private void SymbolicExpressionTreeChart_MouseDown(object sender, MouseEventArgs e)
{
this.dragButtons = e.Button;
this.draggedSymbolicExpressionTree = FindVisualSymbolicExpressionTreeNodeAt(e.X, e.Y);
}
