/// <summary>
/// 查找一次中转的路线。
/// </summary>
/// <param name="startNode">开始节点。</param>
/// <param name="endNode">结束节点。</param>
/// <returns>乘车路线。</returns>
private MetroPath FindOneTransferPath(MetroNode startNode, MetroNode endNode)
{
List <MetroPath> pathList = new List <MetroPath>();
foreach (var startLine in startNode.Links.Select(c => c.Line).Distinct())
{
foreach (var endLine in endNode.Links.Select(c => c.Line).Where(c => c != startLine).Distinct())
{
//两条线路的中转站
foreach (var transferNode in this.Graph.GetTransferNodes(startLine, endLine))
{
//起点到中转站的直达路线
var startDirectPathList = FindShortestPaths(startNode, transferNode, startLine);
//中转站到终点的直达路线
var endDirectPathList = FindShortestPaths(transferNode, endNode, endLine);
//合并两条直达路线
foreach (var startDirectPath in startDirectPathList)
{
foreach (var endDirectPath in endDirectPathList)
{
var directPath = startDirectPath.Merge(endDirectPath);
pathList.Add(directPath);
}
}
}
}
}
//挑选最短路线
return(GetShortestPath(pathList));
}
/// <summary>
/// 查找直达路线。
/// </summary>
/// <param name="startNode">开始节点。</param>
/// <param name="endNode">结束节点。</param>
/// <returns>乘车路线。</returns>
private MetroPath FindDirectPath(MetroNode startNode, MetroNode endNode)
{
MetroPath path = new MetroPath();
var startLines = startNode.Links.Select(c => c.Line).Distinct().ToList();
var endLines = endNode.Links.Select(c => c.Line).Distinct().ToList();
var lines = startLines.Where(c => endLines.Contains(c)).ToList();
if (lines.Count == 0)
{
return(path);
}
//查找直达路线
List <MetroPath> pathList = new List <MetroPath>();
foreach (var line in lines)
{
pathList.AddRange(FindShortestPaths(startNode, endNode, line));
}
//挑选最短路线
return(GetShortestPath(pathList));
}
/// <summary>
/// 判断是否包含指定的站点。
/// </summary>
/// <exception cref="ArgumentNullException">如果node为空引用，则跑出该异常。</exception>
public bool ContainsNode(MetroNode node)
{
if (node == null)
{
throw new ArgumentNullException("node");
}
return(Links.FirstOrDefault(c => c.From == node || c.To == node) != null);
}
/// <summary>
/// 构造函数。
/// </summary>
/// <param name="line">所属线路。</param>
/// <param name="from">来源站点。</param>
/// <param name="to">目标站点。</param>
/// <exception cref="ArgumentNullException">如果from或to为空引用，则抛出该异常。</exception>
public MetroLink(MetroLine line, MetroNode from, MetroNode to)
{
if (line == null)
{
throw new ArgumentNullException("line");
}
if (from == null)
{
throw new ArgumentNullException("from");
}
if (to == null)
{
throw new ArgumentNullException("to");
}
m_line = line;
m_from = from;
m_to = to;
}
/// <summary>
/// 绘制地铁站点。
/// </summary>
/// <param name="g">绘图图面。</param>
/// <param name="node">地铁站点。</param>
private void PaintNode(Graphics g, MetroNode node)
{
if (node.Name != "1" && node.Name != "2" && node.Name != "3")
{
//绘制站点圆圈
Color color = node.Links.Count > 2 ? Color.Black : node.Links[0].Line.Color;
var rect = GetNodeRect(node);
g.FillEllipse(Brushes.White, rect);
using (Pen pen = new Pen(color))
{
g.DrawEllipse(pen, rect);
}
if (node.Links.Count > 2)
{
Point p = new Point(node.X - 4, node.Y - 4);
//g.DrawString("C", Font, Brushes.Red, p);
var startNodeImage = Properties.Resources.Trans;
g.DrawImage(startNodeImage, node.X - 10, node.Y - 10);
}
//绘制站点名称
var sz = g.MeasureString(node.Name, this.Font).ToSize();
Point pt = new Point(node.X - sz.Width / 2, node.Y + (rect.Height >> 1) + 4);
g.DrawString(node.Name, new Font("微软雅黑", 9, FontStyle.Bold), Brushes.Black, pt);
}
if (node.Name == "2")
{
Color color = node.Links.Count > 2 ? Color.Black : node.Links[0].Line.Color;
var rect = GetNodeRect(node);
//g.FillEllipse(Brushes.White, rect);
using (Pen pen = new Pen(color))
{
//g.DrawEllipse(pen, rect);
g.FillEllipse(new SolidBrush(color), node.X - 2, node.Y - 2, 8, 8);
}
}
}
private void BtnAddNodeC_Click(object sender, EventArgs e)
{
try
{
bool IsDouLine1 = false;
bool IsDouLine2 = false;
MetroNode NewNode = new MetroNode();
MetroNode PreNode = new MetroNode();
MetroNode NexNode = new MetroNode();
String Prename = (CobPreNode.Text.ToString() == "海伦路" && CobNexNode.Text.ToString() == "宝山路") || (CobPreNode.Text.ToString() == "宝山路" && CobNexNode.Text.ToString() == "海伦路") ? "3" : CobPreNode.Text.ToString();
String Nexname = (CobPreNode.Text.ToString() == "海伦路" && CobNexNode.Text.ToString() == "宝山路") || (CobPreNode.Text.ToString() == "宝山路" && CobNexNode.Text.ToString() == "海伦路") ? "2" : CobNexNode.Text.ToString();
foreach (var node in metroGraphView1.Graph.Nodes)
{
if (node.Name == Prename)
{
PreNode = node;
}
if (node.Name == Nexname)
{
NexNode = node;
}
}
NewNode.Name = this.TxtNodeName.Text.ToString();
NewNode.X = (CobPreNode.Text.ToString() == "海伦路" && CobNexNode.Text.ToString() == "宝山路") || (CobPreNode.Text.ToString() == "宝山路" && CobNexNode.Text.ToString() == "海伦路") ? 2033 : int.Parse(this.TxtNodeX.Text.ToString());
NewNode.Y = (CobPreNode.Text.ToString() == "海伦路" && CobNexNode.Text.ToString() == "宝山路") || (CobPreNode.Text.ToString() == "宝山路" && CobNexNode.Text.ToString() == "海伦路") ? 750 : int.Parse(this.TxtNodeY.Text.ToString());
if ((Math.Abs(NewNode.X - PreNode.X) > 200 || Math.Abs(NewNode.Y - PreNode.Y) > 200 || Math.Abs(NewNode.X - NexNode.X) > 200 || Math.Abs(NewNode.Y - NexNode.Y) > 200) && (PreNode.Name != "" && NexNode.Name != ""))
{
MessageBox.Show("距离太远了哦，请重新设定坐标(´▽`ʃ♡ƪ)");
this.TxtNodeX.Text = "";
this.TxtNodeY.Text = "";
return;
}
for (int i = 0; i < PreNode.Links.Count; i++)
{
if (PreNode.Links[i].Flag == 1 && PreNode.Links.Count > 3)
{
IsDouLine1 = true;
}
}
for (int i = 0; i < NexNode.Links.Count; i++)
{
if (NexNode.Links[i].Flag == 1 && NexNode.Links.Count > 3)
{
IsDouLine2 = true;
}
}
if (!IsDouLine2 || !IsDouLine1)
{
MetroLine NewLine = new MetroLine();
foreach (var line in metroGraphView1.Graph.Lines)
{
if (line.Name == CobNodeLine.Text.ToString())
{
NewLine = line;
}
}
if (!((CobPreNode.Text == "" || CobPreNode.Text == null) && NexNode.Links.Count <= 1))
{
MetroLink NewLink = new MetroLink(NewLine, NewNode, PreNode);
NewLink.Weight = 3;
NewNode.Links.Add(NewLink);
NewLink.Flag = 0;
}
if (!((CobNexNode.Text == "" || CobNexNode.Text == null) && PreNode.Links.Count <= 1))
{
MetroLink NewLink = new MetroLink(NewLine, NewNode, NexNode);
NewLink.Flag = 0;
NewLink.Weight = 3;
NewNode.Links.Add(NewLink);
}
if (!((CobPreNode.Text == "" || CobPreNode.Text == null) && NexNode.Links.Count <= 1))
{
for (int i = 0; i < PreNode.Links.Count; i++)
{
if (PreNode.Links[i].To.Name == NexNode.Name)
{
PreNode.Links.RemoveAt(i);
}
}
}
PreNode.Links.Add(new MetroLink(NewLine, PreNode, NewNode));
if (!((CobNexNode.Text == "" || CobNexNode.Text == null) && PreNode.Links.Count <= 1))
{
for (int i = 0; i < NexNode.Links.Count; i++)
{
if (NexNode.Links[i].To.Name == PreNode.Name)
{
NexNode.Links.RemoveAt(i);
}
}
}
NexNode.Links.Add(new MetroLink(NewLine, NexNode, NewNode));
metroGraphView1.Graph.Nodes.Add(NewNode);
}
else
{
for (int i = 0; i < PreNode.Links.Count; i++)
{
if (PreNode.Links[i].To.Name == NexNode.Name)
{
MetroLine NewLine = new MetroLine();
NewLine = PreNode.Links[i].Line;
MetroLink NewLink = new MetroLink(NewLine, PreNode, NewNode);
NewLink.Flag = PreNode.Links[i].Flag;
MetroLink SNewLink = new MetroLink(NewLine, NewNode, NexNode);
SNewLink.Flag = PreNode.Links[i].Flag;
SNewLink.Weight = 3;
NewNode.Links.Add(SNewLink);
PreNode.Links.RemoveAt(i);
PreNode.Links.Add(NewLink);
}
}
for (int i = 0; i < NexNode.Links.Count; i++)
{
if (NexNode.Links[i].To.Name == PreNode.Name)
{
MetroLine NewLine = new MetroLine();
NewLine = NexNode.Links[i].Line;
MetroLink NewLink = new MetroLink(NewLine, NexNode, NewNode);
NewLink.Flag = NexNode.Links[i].Flag;
MetroLink SNewLink = new MetroLink(NewLine, NewNode, PreNode);
SNewLink.Flag = NexNode.Links[i].Flag;
SNewLink.Weight = 3;
NewNode.Links.Add(SNewLink);
NexNode.Links.RemoveAt(i);
NexNode.Links.Add(NewLink);
}
}
metroGraphView1.Graph.Nodes.Add(NewNode);
}
//metroGraphView1.SaveToFile(Application.StartupPath + "\\MetroGraph.xml");
metroGraphView1.Invalidate();
this.CobPreNode.Text = "";
this.CobNexNode.Text = "";
this.TxtNodeName.Text = "";
this.TxtNodeX.Text = "";
this.TxtNodeY.Text = "";
this.TxtLineName.Text = "";
this.CobNodeLine.Text = "";
this.colorDialog1.Reset();
this.LabNexXY.Text = "";
this.LabPreXY.Text = "";
}
catch
{
MessageBox.Show("请检查是否有误哦(✿◕‿◕✿)");
return;
}
this.PnlAddNode.Visible = false;
this.BtnMetroHelp.Visible = true;
this.BtnAdd.Visible = true;
this.BtnSave.Visible = true;
}
/// <summary>
/// 获取地铁站点的矩形区域。
/// </summary>
/// <param name="node">地铁站点。</param>
/// <returns></returns>
private Rectangle GetNodeRect(MetroNode node)
{
int r = node.Links.Count > 2 ? 7 : 5;
return(new Rectangle(node.X - r, node.Y - r, (r << 1) + 1, (r << 1) + 1));
}
/// <summary>
/// 查找指定两个节点之间的最短路径。
/// </summary>
/// <param name="startNode">开始节点。</param>
/// <param name="endNode">结束节点。</param>
/// <param name="line">目标线路（为null表示不限制线路）。</param>
/// <returns>乘车路线列表。</returns>
private List <MetroPath> FindShortestPaths(MetroNode startNode, MetroNode endNode, MetroLine line)
{
List <MetroPath> pathtList = new List <MetroPath>();
if (startNode == endNode)
{
return(pathtList);
}
//路径队列，用于遍历路径
Queue <MetroPath> pathQueue = new Queue <MetroPath>();
pathQueue.Enqueue(new MetroPath());
while (pathQueue.Count > 0)
{
var path = pathQueue.Dequeue();
//如果已经超过最短路径，则直接返回
if (pathtList.Count > 0 && path.Links.Count > pathtList[0].Links.Count)
{
continue;
}
//路径的最后一个节点
MetroNode prevNode = path.Links.Count > 0 ? path.Links[path.Links.Count - 1].From : null;
MetroNode lastNode = path.Links.Count > 0 ? path.Links[path.Links.Count - 1].To : startNode;
//继续寻找后续节点
//int Gx_min = int.MaxValue;
//int Gx;
foreach (var link in lastNode.Links.Where(c => c.To != prevNode && (line == null || c.Line == line)))
{
/*Gx = Math.Abs(link.To.X - endNode.X) + Math.Abs(link.To.Y - endNode.Y) + 500 * path.Links.Count;
*
* if (Gx < Gx_min)
* Gx_min = Gx;
* else
* continue;*/
if (link.Weight == 2)
{
continue;
}
if (link.To == endNode)
{
MetroPath newPath = path.Append(link);
if (pathtList.Count == 0 || newPath.Links.Count == pathtList[0].Links.Count)
{//找到一条路径
pathtList.Add(newPath);
}
else if (newPath.Links.Count < pathtList[0].Links.Count)
{//找到一条更短的路径
pathtList.Clear();
pathtList.Add(newPath);
}
else
{
break; //更长的路径没有意义
}
}
else if (!path.ContainsNode(link.To))
{
pathQueue.Enqueue(path.Append(link));
}
link.Weight = 2;
}
}
return(pathtList);
}
/// <summary>
/// 查找乘车路线。
/// </summary>
/// <param name="startNode">起点。</param>
/// <param name="endNode">终点。</param>
/// <returns>乘车路线。</returns>
public MetroPath FindPath(MetroNode startNode, MetroNode endNode)
{
MetroPath path = new MetroPath();
if (startNode == null || endNode == null)
{
return(path);
}
if (startNode == endNode)
{
return(path);
}
foreach (var item in this.Graph.Nodes)
{
foreach (var link in item.Links)
{
link.Weight = 3;
}
}
//如果起点和终点拥有共同线路，则查找直达路线
path = FindDirectPath(startNode, endNode);
if (path.Links.Count > 0)
{
return(path);
}
//如果起点和终点拥有一个共同的换乘站点，则查找一次换乘路线
//path = FindOneTransferPath(startNode, endNode);
//if (path.Links.Count > 0) return path;
//查找路径最短的乘车路线
var pathList = FindShortestPaths(startNode, endNode, null);
//查找换乘次数最少的一条路线
int minTransfers = int.MaxValue;
foreach (var item in pathList)
{
var curTransfers = item.Transfers;
if (curTransfers < minTransfers)
{
minTransfers = curTransfers;
path = item;
}
}
if (CurPath.Links.Count > 0)
{
this.BackColor = Color.White;
}
else
{
this.BackColor = Color.WhiteSmoke;
}
return(path);
}
