//--------------------------- UpdateGraphFromBrush ----------------------------
//
// given a brush and a node index, this method updates the graph appropriately
// (by removing/adding nodes or changing the costs of the node's edges)
//-----------------------------------------------------------------------------
public void UpdateGraphFromBrush(int brush, int CellIndex)
{
//set the terrain type in the terrain index
m_TerrainType[CellIndex] = brush;
//if current brush is an obstacle then this node must be removed
//from the graph
if (brush == (int)brush_type.obstacle)
{
m_Graph.RemoveNode(CellIndex);
}
else
{
//make the node active again if it is currently inactive
if (!m_Graph.isNodePresent(CellIndex))
{
int y = CellIndex / m_iCellsY;
int x = CellIndex - (y * m_iCellsY);
m_Graph.AddNode(new NavGraphNode(CellIndex, new Vector2D(x * m_dCellWidth + m_dCellWidth / 2.0,
y * m_dCellHeight + m_dCellHeight / 2.0)));
SparseGraph.Helper_AddAllNeighboursToGridNode(m_Graph, y, x, m_iCellsX, m_iCellsY);
}
//set the edge costs in the graph
SparseGraph.Helper_WeightNavGraphNodeEdges(m_Graph, CellIndex, GetTerrainCost((brush_type)brush));
}
}