/// <summary>
/// Draws connector line between two nodes.
/// </summary>
/// <param name="info">Connector context information.</param>
public override void DrawConnector(ConnectorRendererEventArgs info)
{
if(info.NodeConnector.LineColor.IsEmpty || info.NodeConnector.LineWidth<=0)
return;
Point pStart, pEnd;
// FromNode is null when connector is rendered for the child node
if (info.FromNode == null)
{
Rectangle cellBounds = NodeDisplay.GetNodeRectangle(eNodeRectanglePart.NodeContentBounds, info.ToNode, info.Offset);
Rectangle expandBounds = NodeDisplay.GetNodeRectangle(eNodeRectanglePart.ExpandBounds, info.ToNode, info.Offset);
pStart = new Point(cellBounds.X - 4, cellBounds.Y + cellBounds.Height / 2);
pEnd = new Point(expandBounds.X + expandBounds.Width / 2, pStart.Y);
}
else
{
// FromNode is parent node, ToNode is last visible child node. Connector is vertical line from parent to last visible child
Rectangle cellBounds = NodeDisplay.GetNodeRectangle(eNodeRectanglePart.NodeContentBounds, info.FromNode, info.Offset);
Rectangle expandBounds = NodeDisplay.GetNodeRectangle(eNodeRectanglePart.ExpandBounds, info.ToNode, info.Offset);
pStart = new Point(expandBounds.X + expandBounds.Width / 2, cellBounds.Bottom);
pEnd = new Point(pStart.X, expandBounds.Y + expandBounds.Height / 2);
}
Graphics g = info.Graphics;
using (Pen pen = GetLinePen(info))
{
SmoothingMode sm = g.SmoothingMode;
if (pen.DashStyle != DashStyle.Solid)
g.SmoothingMode = SmoothingMode.Default;
g.DrawLine(pen, pStart, pEnd);
g.SmoothingMode = sm;
}
}
/// <summary>
/// Raises RenderConnector event.
/// </summary>
/// <param name="e">Event data.</param>
protected virtual void OnRenderConnector(ConnectorRendererEventArgs e)
{
if(RenderConnector!=null)
RenderConnector(this, e);
}
/// <summary>
/// Draws connector between nodes. If you need to provide custom rendering this is the method that you should override in your custom rendered. If you
/// do not want default rendering to occur do not call the base implementation. You can call OnRenderConnector method so events can occur.
/// </summary>
/// <param name="e">Information provided for rendering.</param>
public virtual void DrawConnector(ConnectorRendererEventArgs e)
{
OnRenderConnector(e);
}
/// <summary>
/// Draws connector line between two nodes.
/// </summary>
/// <param name="info">Connector context information.</param>
public virtual void DrawConnector(ConnectorRendererEventArgs info){}
///// <summary>
///// Returns the connector starting coordinates.
///// </summary>
///// <param name="info">Connector display information.</param>
///// <returns>Point object.</returns>
//protected virtual Point GetStartPoint(ConnectorRendererEventArgs info)
//{
// Point p=Point.Empty;
// if(info.IsRootNode)
// {
// //int toMidPoint=info.ToNode.Bounds.Top+info.ToNode.Bounds.Height/2;
// //if(info.FromNode.Bounds.Top>toMidPoint)
// if(IsAbove(info.FromNode,info.ToNode))
// p=new Point(info.FromNode.BoundsRelative.Left+info.FromNode.BoundsRelative.Width/2,info.FromNode.BoundsRelative.Top);
// //else if(info.FromNode.Bounds.Bottom<toMidPoint)
// else if(IsBelow(info.FromNode,info.ToNode))
// p=new Point(info.FromNode.BoundsRelative.Left+info.FromNode.BoundsRelative.Width/2,info.FromNode.BoundsRelative.Bottom-1);
// }
// if(p.IsEmpty)
// {
// // To element to the Left
// if(this.IsOnLeftSide(info.FromNode,info.ToNode))
// p=new Point(info.FromNode.BoundsRelative.Left,info.FromNode.BoundsRelative.Top+info.FromNode.BoundsRelative.Height/2);
// else
// {
// p=new Point(info.FromNode.BoundsRelative.Right,info.FromNode.BoundsRelative.Top+info.FromNode.BoundsRelative.Height/2);
// if(info.IsRootNode)
// p.X--;
// if(!NodeDisplay.DrawExpandPart(info.FromNode) && info.FromNode.ExpandVisibility==eNodeExpandVisibility.Auto)
// p.X-=(info.FromNode.BoundsRelative.Width-info.FromNode.ContentBounds.Width);
// }
// }
// if(!p.IsEmpty)
// p.Offset(info.Offset.X,info.Offset.Y);
// return p;
//}
///// <summary>
///// Returns true if fromNode is above the toNode.
///// </summary>
///// <param name="fromNode">From Node object.</param>
///// <param name="toNode">To Node object</param>
///// <returns>True if fromNode is above toNode.</returns>
//protected bool IsAbove(Node fromNode, Node toNode)
//{
// //int toMidPoint=toNode.Bounds.Top+toNode.Bounds.Height/2;
// //if(fromNode.Bounds.Top>toMidPoint)
// if(fromNode.BoundsRelative.Top>toNode.BoundsRelative.Bottom)
// return true;
// return false;
//}
///// <summary>
///// Returns true if fromNode is below toNode.
///// </summary>
///// <param name="fromNode">From Node object.</param>
///// <param name="toNode">To Node object.</param>
///// <returns>True if fromNode is below toNode.</returns>
//protected bool IsBelow(Node fromNode, Node toNode)
//{
// int toMidPoint=toNode.BoundsRelative.Top+toNode.BoundsRelative.Height/2;
// if(fromNode.BoundsRelative.Bottom<toMidPoint)
// return true;
// return false;
//}
///// <summary>
///// Returns whether connector is extended to underline the node.
///// </summary>
///// <param name="nodeStyle">Refernce to Node style.</param>
///// <returns>True if node should be underlined by connector.</returns>
//protected bool UnderlineNode(ElementStyle nodeStyle)
//{
// if(!nodeStyle.PaintBottomBorder && !nodeStyle.PaintTopBorder &&
// !nodeStyle.PaintLeftBorder && !nodeStyle.PaintRightBorder)
// return true;
// return false;
//}
///// <summary>
///// Returns the connector end point. The array of end points. Two valid points will be returned if node needs to be underlined by connector.
///// </summary>
///// <param name="info">Connector display info.</param>
///// <returns>Array of point objects.</returns>
//protected Point[] GetEndPoint(ConnectorRendererEventArgs info)
//{
// // If to element is to the right of the from node and has left border end point is the vertical mid-point
// // If to element is to the left of the from node and has right border end point is the vertical mid-point
// // If there is no border end point is text bottom
// // If this is link connector the end point is the middle bottom or top point of the node
// Point p=Point.Empty;
// Point pLineEnd=Point.Empty;
// int capWidthOffset = 0; // GetCapWidthOffset(info.NodeConnector.EndCap, info.NodeConnector.EndCapSize);
// bool leftSide=this.IsOnLeftSide(info.FromNode,info.ToNode);
// if(info.LinkConnector && info.FromNode.BoundsRelative.Top>info.ToNode.BoundsRelative.Bottom)
// p=new Point(info.ToNode.BoundsRelative.X+info.ToNode.BoundsRelative.Width/2+(leftSide?capWidthOffset:-capWidthOffset),info.ToNode.BoundsRelative.Bottom+1);
// else if(info.LinkConnector && info.FromNode.BoundsRelative.Bottom<info.ToNode.BoundsRelative.Top)
// p=new Point(info.ToNode.BoundsRelative.X+info.ToNode.BoundsRelative.Width/2+(leftSide?capWidthOffset:-capWidthOffset),info.ToNode.BoundsRelative.Top-info.NodeConnector.EndCapSize.Height);
// else
// {
// if(leftSide)
// {
// // To element is to the left of from node
// Rectangle r=info.ToNode.BoundsRelative;
// if(info.StyleToNode==null || UnderlineNode(info.StyleToNode))
// {
// p=new Point(r.Right,r.Bottom);
// if(m_EndCap)
// p.X+=capWidthOffset;
// if(info.NodeConnector.UnderlineNoBorderNode)
// {
// Rectangle rc=NodeDisplay.GetNodeRectangle(eNodeRectanglePart.NodeContentBounds,info.ToNode,Point.Empty);
// pLineEnd=new Point(rc.Left+1,r.Bottom);
// }
// }
// else
// {
// p=new Point(r.Right,r.Y+r.Height/2);
// if(m_EndCap)
// p.X+=capWidthOffset;
// }
// }
// else
// {
// // To element to the right of from node
// Rectangle r=info.ToNode.BoundsRelative;
// if(info.StyleToNode==null || UnderlineNode(info.StyleToNode))
// {
// //r=NodeDisplay.GetCellRectangle(eCellRectanglePart.TextBounds,info.ToNode.Cells[0],Point.Empty);
// //r=info.ToNode.Cells[0].TextContentBounds;
// p=new Point(r.X,r.Bottom);
// if(m_EndCap)
// p.X-=capWidthOffset;
// if(info.NodeConnector.UnderlineNoBorderNode)
// {
// Rectangle rc=NodeDisplay.GetNodeRectangle(eNodeRectanglePart.NodeContentBounds,info.ToNode,Point.Empty);
// pLineEnd=new Point(rc.Right-1,r.Bottom);
// }
// }
// else
// {
// p=new Point(r.X,r.Y+r.Height/2);
// if(m_EndCap)
// p.X-=capWidthOffset;
// }
// }
// }
// if(!p.IsEmpty)
// p.Offset(info.Offset.X,info.Offset.Y);
// if(!pLineEnd.IsEmpty)
// pLineEnd.Offset(info.Offset.X,info.Offset.Y);
// return new Point[] {p,pLineEnd};
//}
///// <summary>
///// Returns the offest for the node connector cap.
///// </summary>
///// <param name="cap">Cap type.</param>
///// <param name="size">Cap size.</param>
///// <returns></returns>
//protected int GetCapWidthOffset(eConnectorCap cap,Size size)
//{
// int capWidthOffset=0;
// switch(cap)
// {
// case eConnectorCap.Arrow:
// capWidthOffset=size.Width+1;
// break;
// case eConnectorCap.Ellipse:
// capWidthOffset=size.Width;
// break;
// }
// return capWidthOffset;
//}
///// <summary>
///// Returns true if source node is on the left side of the target node.
///// </summary>
///// <param name="source">Reference to source node.</param>
///// <param name="target">Reference to target node.</param>
///// <returns>True if source is on the left side of target.</returns>
//protected bool IsOnLeftSide(Node source, Node target)
//{
// if((source.BoundsRelative.Left+source.BoundsRelative.Width/2)>target.BoundsRelative.Left)
// return true;
// return false;
//}
/// <summary>
/// Returns new instance of pen object for node connector line. Caller is responsible for
/// disposing of this object.
/// </summary>
/// <param name="info">Node connector display info.</param>
/// <returns>New instance of Pen object.</returns>
protected Pen GetLinePen(ConnectorRendererEventArgs info)
{
Pen pen = new Pen(info.NodeConnector.LineColor, info.NodeConnector.LineWidth);
pen.DashStyle = info.NodeConnector.DashStyle;
return pen;
}