/// <summary>
/// The activeTrackLocation needs to be between two nodes on the track, if it is to be valid.
/// Here we find whether indeed it is.
/// </summary>
/// <param name="drawnPathData">The data structure with the information on the drawn path</param>
/// <param name="trackNodeIndex">The index of the track node</param>
/// <returns>The node that will be before a possible new node on the track</returns>
TrainpathNode FindPrevNodeOfActiveTrack(DrawnPathData drawnPathData, int trackNodeIndex)
{
Collection <TrainpathNode> nodesOnTrack = drawnPathData.NodesOnTrack(trackNodeIndex);
// We are given a set of nodes. We know that a part of the path was drawn following those nodes
// All of these parts are on the same track.
// The nodes are ordered in pairs.
for (int i = nodesOnTrack.Count - 1; i > 0; i -= 2)
{
if (activeTrackLocation.IsBetween(nodesOnTrack[i - 1], nodesOnTrack[i]))
{
return(nodesOnTrack[i - 1]);
}
}
return(null);
}
/// <summary>
/// Find the location on the track that can be used as a new end or wait node (or possibly start)
/// </summary>
/// <param name="drawnPathData">The data structure with the information on the drawn path</param>
void FindActiveTrackLocation(DrawnPathData drawnPathData)
{
if (drawTrackDB.ClosestTrack == null ||
drawTrackDB.ClosestTrack.TrackNode == null)
{
activeTrackLocation.Location = WorldLocation.None;
return;
}
uint tni = drawTrackDB.ClosestTrack.TrackNode.Index;
int tni_int = (int)tni;
if (!drawnPathData.TrackHasBeenDrawn(tni_int) && CurrentTrainPath.FirstNode != null && activeMouseDragAction == null)
{
activeTrackLocation.Location = WorldLocation.None;
return;
}
int tvsi = drawTrackDB.ClosestTrack.TrackVectorSectionIndex;
float distance = drawTrackDB.ClosestTrack.DistanceAlongTrack;
// find location
WorldLocation location = drawTrackDB.FindLocation(tni, tvsi, distance, true);
// fill the properties of the activeTrackLocation
activeTrackLocation.TvnIndex = tni_int;
activeTrackLocation.TrackVectorSectionIndex = tvsi;
activeTrackLocation.TrackSectionOffset = distance;
activeTrackLocation.Location = location;
if ((CurrentTrainPath.FirstNode != null) && (activeMouseDragAction == null))
{ //Only in case this is not the first path.
TrainpathNode prevNode = FindPrevNodeOfActiveTrack(drawnPathData, tni_int);
if (prevNode == null || prevNode.HasSidingPath)
{
activeTrackLocation.Location = WorldLocation.None;
}
else
{
activeTrackLocation.PrevNode = prevNode;
}
}
}
/// <summary>
/// Find the node in the path that is closest to the mouse,
/// </summary>
/// <param name="drawArea">Area that is being drawn upon and where we have a mouse location</param>
/// <param name="drawnPathData">The data structure with the information on the drawn path</param>
void FindActiveNode(DrawArea drawArea, DrawnPathData drawnPathData)
{
// Initial simplest implementation: find simply the closest and first.
float closestMouseDistanceSquared = float.MaxValue;
TrainpathNode closestNode = null;
foreach (TrainpathNode node in drawnPathData.DrawnNodes)
{
float distanceSquared = CloseToMouse.GetGroundDistanceSquared(node.Location, drawArea.MouseLocation);
// by using '<=' instead of '<' we should get the latest one, which overrides earlier ones
if (distanceSquared <= closestMouseDistanceSquared)
{
closestMouseDistanceSquared = distanceSquared;
closestNode = node;
}
}
activeNode = closestNode;
}
/// <summary>
/// Find the active node and active node candidate and draw them
/// </summary>
/// <param name="drawArea">Area to draw upon</param>
public void Draw(DrawArea drawArea)
{
DrawnPathData drawnPathData = new DrawnPathData();
int numberDrawn = drawPath.Draw(drawArea, currentTrainPath.FirstNode, currentTrainPath.FirstNodeOfTail, numberToDraw,
drawnPathData);
if (numberDrawn < numberToDraw)
{
// Apparently we were not able to draw all nodes. Reset maximum number to draw, and possibly add a node
numberToDraw = numberDrawn;
if (EditingIsActive && allowAddingNodes &&
(CurrentNode != null) && (CurrentNode.NodeType != TrainpathNodeType.End))
{
nonInteractiveAction.AddMainNode(CurrentNode, UpdateAfterEdits);
}
}
if (!EditingIsActive)
{
return;
}
if (EnableMouseUpdate)
{
FindActiveNode(drawArea, drawnPathData);
FindActiveTrackLocation(drawnPathData);
}
float textureSize = 8f;
int minPixelSize = 7;
int maxPixelSize = 24;
if (activeNode != null && activeNode.Location != null)
{
drawArea.DrawTexture(activeNode.Location, "ring", textureSize, minPixelSize, maxPixelSize, DrawColors.colorsNormal.ActiveNode);
}
if (activeTrackLocation != null && activeTrackLocation.Location != WorldLocation.None)
{
drawArea.DrawTexture(activeTrackLocation.Location, "ring", textureSize, minPixelSize, maxPixelSize, DrawColors.colorsNormal.CandidateNode);
}
}
/// <summary>
/// Find the node in the path that is closest to the mouse,
/// </summary>
/// <param name="drawArea">Area that is being drawn upon and where we have a mouse location</param>
/// <param name="drawnPathData">The data structure with the information on the drawn path</param>
void FindActiveNode(DrawArea drawArea, DrawnPathData drawnPathData)
{
// Initial simplest implementation: find simply the closest and first.
float closestMouseDistanceSquared = float.MaxValue;
TrainpathNode closestNode = null;
foreach (TrainpathNode node in drawnPathData.DrawnNodes)
{
float distanceSquared = CloseToMouse.GetGroundDistanceSquared(node.Location, drawArea.MouseLocation);
// by using '<=' instead of '<' we should get the latest one, which overrides earlier ones
// To prevent numerical issues, we add a small number (smaller than two junctions would normally be together
if (distanceSquared <= closestMouseDistanceSquared + 0.1f)
{
closestMouseDistanceSquared = distanceSquared;
closestNode = node;
}
}
activeNode = closestNode;
}
/// <summary>
/// Draw the actual path coded in the PATfile (for a number of nodes that can be extended or reduced)
/// </summary>
/// <param name="drawArea">Area to draw upon</param>
/// <param name="firstNode">The first node of the path to draw</param>
/// <param name="firstNodeOfTail">The node that is the start of the tail (if available)</param>
/// <param name="numberToDraw">The requested number of nodes to draw</param>
/// <param name="drawnPathData">Data structure that we will fill with information about the path we have drawn</param>
/// <returns>the number of nodes actually drawn (not taking into account nodes on a siding)</returns>
public int Draw(DrawArea drawArea,
TrainpathNode firstNode,
TrainpathNode firstNodeOfTail,
int numberToDraw,
DrawnPathData drawnPathData)
{
//List of all nodes that need to be drawn.
List<TrainpathNode> drawnNodes = new List<TrainpathNode>();
// start of path
TrainpathNode currentSidingNode = null; // we start without siding path
CurrentMainNode = firstNode;
if (CurrentMainNode == null)
{
// no path, but there might still be a tail
DrawTail(drawArea, colorSchemeMain, null, firstNodeOfTail);
return 0;
}
drawnNodes.Add(CurrentMainNode);
drawnPathData.AddNode(CurrentMainNode);
// We want to draw only a certain number of nodes. And if there is a siding, for the siding
// we also want to draw the same number of nodes from where it splits from the main track
int numberDrawn = 1;
while (numberDrawn < numberToDraw)
{
// If we have a current siding track, we draw it
if (currentSidingNode != null)
{
//finish the complete siding path if the main path is at end of siding already
int sidingNodesToDraw = (CurrentMainNode.NodeType == TrainpathNodeType.SidingEnd) ? Int32.MaxValue : 1;
while (sidingNodesToDraw >= 1)
{
//while tracking a siding, it has its own next node
TrainpathNode nextNodeOnSiding = currentSidingNode.NextSidingNode;
if (nextNodeOnSiding != null) // because also this path can run off at the end
{
DrawPathOnVectorNode(drawArea, colorSchemeSiding, currentSidingNode, nextNodeOnSiding, currentSidingNode.NextSidingTvnIndex);
drawnNodes.Add(nextNodeOnSiding);
drawnPathData.AddNode(nextNodeOnSiding);
//siding nodes will not be added to drawnPathData
sidingNodesToDraw--;
}
else
{
sidingNodesToDraw = 0;
}
currentSidingNode = nextNodeOnSiding;
}
}
// Draw the start of a siding path, so from this main line point to the next siding node.
// If there is a next siding node, we also reset the currentSidingNode
// but probably it is not allowed to have siding on a siding
TrainpathNode nextSidingNode = CurrentMainNode.NextSidingNode;
if (nextSidingNode != null)
{
DrawPathOnVectorNode(drawArea, colorSchemeSiding, CurrentMainNode, nextSidingNode, CurrentMainNode.NextSidingTvnIndex);
drawnNodes.Add(nextSidingNode);
drawnPathData.AddNode(nextSidingNode);
currentSidingNode = nextSidingNode;
}
// From this mainline point to the next
TrainpathNode nextMainNode = CurrentMainNode.NextMainNode;
if (nextMainNode != null)
{
DrawPathOnVectorNode(drawArea, colorSchemeMain, CurrentMainNode, nextMainNode, CurrentMainNode.NextMainTvnIndex);
drawnNodes.Add(nextMainNode);
drawnPathData.AddNode(nextMainNode);
drawnPathData.NoteAsDrawn(CurrentMainNode, nextMainNode);
CurrentMainNode = nextMainNode;
numberDrawn++;
}
else
{
// no more nodes, so leave the loop even if we did not draw the amount of points requested
break;
}
}
//Draw all the nodes themselves
foreach (TrainpathNode node in drawnNodes) {
DrawNodeItself(drawArea, node);
}
DrawTail(drawArea, colorSchemeMain, drawnNodes.Last(), firstNodeOfTail);
return numberDrawn;
}
/// <summary>
/// Draw the actual path coded in the PATfile, completely.
/// </summary>
/// <param name="drawArea">Area to draw upon</param>
/// <param name="firstNode">The first node of the path to draw</param>
public void Draw(DrawArea drawArea, TrainpathNode firstNode)
{
DrawnPathData dummyData = new DrawnPathData();
Draw(drawArea, firstNode, null, int.MaxValue, dummyData);
}