/// <summary>
/// Move the unit to destination grid position
/// </summary>
/// <param name="destination">coords to move to</param>
/// <returns>true if move successful, false otherwise</returns>
public bool Move(Coords destination)
{
//unhighlight the move tiles when moving
UnhighlightTiles();
//create a new Breadth-first search object
BFS bfs = new BFS();
//check is unit has no path to destination
if (!HasPath(destination, ref bfs, moveRange))
{
return(false);
}
//set new position
transform.position = Grid.CoordsToWorldSpace(destination);
return(true);
}
/// <summary>
/// Determine the best move towards attacking range of unit
/// </summary>
/// <param name="movingUnitController">the unit that will be moving</param>
/// <param name="targetUnitController">the unit to move towards</param>
private void MoveTowardsUnit(UnitController movingUnitController, UnitController targetUnitController)
{
Transform movingUnitTransform = movingUnitController.GetComponent <Transform>(); //transform of moving unit
Coords movingUnitCoords = movingUnitController.GetUnitCoords();
Coords targetUnitCoords = targetUnitController.GetUnitCoords();
int attackRange = movingUnitController.GetAttackRange();
int moveRange = movingUnitController.GetMoveRange();
//Determine best coordinates to move to to be within attack range
//we will get a couple of coords and then check to see which one is shortest distance from moving unit
//check the spaces next to target for best space eligibility
List <Coords> coordsToCheck = new List <Coords>(); //a list of coords to check for best space eligibility
//look at spaces left of target
//move from furthest space attackable from to closer to target unit
for (int x = targetUnitCoords.X - attackRange; x < targetUnitCoords.X; x += 2) //increment by two because if a space isn't good then the next one won't be either
{
Coords testCoords = new Coords(x, targetUnitCoords.Y);
if (targetUnitController.HasDirectPath(testCoords))
{
//coords close to target and has direct path, add them to list of coords to check
coordsToCheck.Add(testCoords);
}
}
//spaces right of target
for (int x = targetUnitCoords.X + attackRange; x > targetUnitCoords.X; x -= 2)
{
Coords testCoords = new Coords(x, targetUnitCoords.Y);
if (targetUnitController.HasDirectPath(testCoords))
{
//coords close to target and has direct path, add them to list of coords to check
coordsToCheck.Add(testCoords);
}
}
//spaces above target
for (int y = targetUnitCoords.Y + attackRange; y > targetUnitCoords.Y; y -= 2)
{
Coords testCoords = new Coords(targetUnitCoords.X, y);
if (targetUnitController.HasDirectPath(testCoords))
{
//coords close to target and has direct path, add them to list of coords to check
coordsToCheck.Add(testCoords);
}
}
//spaces below target
for (int y = targetUnitCoords.Y - attackRange; y < targetUnitCoords.Y; y += 2)
{
Coords testCoords = new Coords(targetUnitCoords.X, y);
if (targetUnitController.HasDirectPath(testCoords))
{
//coords close to target and has direct path, add them to list of coords to check
coordsToCheck.Add(testCoords);
}
}
//evaluate coords that were added to list
//look for the one with the shortest path from moving unit
int shortestPathLength = int.MaxValue; //the length of the path to the coords that have the shortest path from moving to target
BFS shortestPathBFS = new BFS(); //the bfs of the shortest path to coords
foreach (var coords in coordsToCheck)
{
BFS bfs = new BFS();
if (movingUnitController.HasPath(coords, ref bfs))
{
int solutionLength = bfs.GetSolutionLength();
if (solutionLength < shortestPathLength)
{
shortestPathLength = solutionLength;
shortestPathBFS = bfs;
}
}
}
//Move (partially or fully)
//traverse through bfs
int stepsTaken = 0; //the number of space moved already
Coords coordsToMoveTo = movingUnitCoords; //the coords to move to (within moveRange)
shortestPathBFS.Reset();
while (stepsTaken < moveRange && shortestPathBFS.HasNext())
{
//step along path to destination
coordsToMoveTo = coordsToMoveTo.Get(shortestPathBFS.Next());
stepsTaken++; //unit has moved 1 space
}
//set new position for moving unit
movingUnitTransform.position = Grid.CoordsToWorldSpace(coordsToMoveTo);
//update unit location on grid
grid.SetGridArray(coordsToMoveTo, movingUnitController.gameObject);
grid.SetGridArray(movingUnitCoords, null);
}
