private void checkForClickedNode(Vector2 clickPosition,
bool leftAltPressed, bool rightAltPressed)
{
PositionalNode nodeClicked = null;
PathNodeRadar nodeRadar = new PathNodeRadar(clickPosition, g);
List<PositionalNode> adjacentNodes;
nodeRadar.AdjacentNodes(out adjacentNodes);
foreach (PositionalNode n in adjacentNodes)
{
Vector2 mouseToNode = n.Position - clickPosition;
if (mouseToNode.LengthSquared() < nodeRadius * nodeRadius)
{
nodeClicked = n;
break;
}
}
if (nodeClicked != null)
{
if (leftAltPressed && !rightAltPressed)
{
if (SourceNode != null)
ChangeNodeColor(SourceNode, NodeColor);
SourceNode = nodeClicked;
ChangeNodeColor(nodeClicked, Color.White);
}
else if (!leftAltPressed && rightAltPressed)
{
if (TargetNode != null)
ChangeNodeColor(TargetNode, NodeColor);
TargetNode = nodeClicked;
ChangeNodeColor(nodeClicked, Color.Black);
}
}
}
// Depending on whether or not source and target nodes have
// been selected, this method will display the A* path between
// source and target, or instruct the player's entity to move
// along the A* path to the target.
private void updatePathDisplay()
{
IGameEntity player = EntityManager.Instance.GetPlayer();
if (SourceNode == null && TargetNode != null && !player.FollowingPath)
{
PathNodeRadar nodeRadar = new PathNodeRadar(player.Position, g);
List<PositionalNode> adjacentNodes;
nodeRadar.AdjacentNodes(out adjacentNodes);
PositionalNode nodeClosestToPlayer = null;
float minDistSquared = float.MaxValue;
foreach (PositionalNode n in adjacentNodes)
{
float distSquared = (n.Position - player.Position).LengthSquared();
if (distSquared < minDistSquared)
{
minDistSquared = distSquared;
nodeClosestToPlayer = n;
}
}
AStarSearch search = new AStarSearch(g, nodeClosestToPlayer.Index,
TargetNode.Index, AStarHeuristics.Distance);
if (search.TargetFound)
{
// Change old path back to default curEdge color.
for (int i = 0; i < path.Count - 1; i++)
ChangeEdgeColor(g.GetEdge(path[i], path[i + 1]), EdgeColor);
search.PathToTarget(out path);
// Change new path to contrasting curEdge color.
for (int i = 0; i < path.Count - 1; i++)
ChangeEdgeColor(g.GetEdge(path[i], path[i + 1]), Color.Red);
List<Vector2> nodePositions = new List<Vector2>();
for (int i = 0; i < path.Count; i++)
nodePositions.Add(g.GetNode(path[i]).Position);
player.FollowPath(nodePositions, false);
}
}
else if (SourceNode != null && TargetNode != null)
{
AStarSearch search = new AStarSearch(g, SourceNode.Index,
TargetNode.Index, AStarHeuristics.Distance);
if (search.TargetFound)
{
// Change old path back to default curEdge color.
for (int i = 0; i < path.Count - 1; i++)
ChangeEdgeColor(g.GetEdge(path[i], path[i + 1]), EdgeColor);
search.PathToTarget(out path);
// Change new path to contrasting curEdge color.
for (int i = 0; i < path.Count - 1; i++)
ChangeEdgeColor(g.GetEdge(path[i], path[i + 1]), Color.Red);
}
}
}