private Vector2 getNewTargetSquare()
{
List <Vector2> path = PathFinder.FindPath(TileMap.GetSquareAtPixel(EnemySprite.WorldCenter), TileMap.GetSquareAtPixel(Player.BaseSprite.WorldCenter));
if (path.Count > 1)
{
return(new Vector2(path[1].X, path[1].Y));
}
else
{
return(TileMap.GetSquareAtPixel(Player.BaseSprite.WorldCenter));
}
}
private bool reachedTargetSquare()
{
return(Vector2.Distance(EnemySprite.WorldCenter, TileMap.GetSquareCenter(currentTargetSquare)) <= 2);
}
static public List <Vector2> FindPath(
Vector2 startTile,
Vector2 endTile)
{
if (TileMap.IsWallTile(endTile) ||
TileMap.IsWallTile(startTile))
{
return(null);
}
openList.Clear();
nodeCosts.Clear();
nodeStatus.Clear();
PathNode startNode;
PathNode endNode;
endNode = new PathNode(null, null, endTile, 0);
startNode = new PathNode(null, endNode, startTile, 0);
addNodeToOpenList(startNode);
while (openList.Count > 0)
{
PathNode currentNode = openList[openList.Count - 1];
if (currentNode.IsEqualToNode(endNode))
{
List <Vector2> bestPath = new List <Vector2>();
while (currentNode != null)
{
bestPath.Insert(0, currentNode.GridLocation);
currentNode = currentNode.ParentNode;
}
return(bestPath);
}
openList.Remove(currentNode);
nodeCosts.Remove(currentNode.GridLocation);
foreach (
PathNode possibleNode in
findAdjacentNodes(currentNode, endNode))
{
if (nodeStatus.ContainsKey(possibleNode.GridLocation))
{
if (nodeStatus[possibleNode.GridLocation] ==
NodeStatus.Closed)
{
continue;
}
if (
nodeStatus[possibleNode.GridLocation] ==
NodeStatus.Open)
{
if (possibleNode.TotalCost >=
nodeCosts[possibleNode.GridLocation])
{
continue;
}
}
}
addNodeToOpenList(possibleNode);
}
nodeStatus[currentNode.GridLocation] = NodeStatus.Closed;
}
return(null);
}
static private List <PathNode> findAdjacentNodes(
PathNode currentNode,
PathNode endNode)
{
List <PathNode> adjacentNodes = new List <PathNode>();
int X = currentNode.GridX;
int Y = currentNode.GridY;
bool upLeft = true;
bool upRight = true;
bool downLeft = true;
bool downRight = true;
if ((X > 0) && (!TileMap.IsWallTile(X - 1, Y)))
{
adjacentNodes.Add(new PathNode(
currentNode,
endNode,
new Vector2(X - 1, Y),
CostStraight + currentNode.DirectCost));
}
else
{
upLeft = false;
downLeft = false;
}
if ((X < 49) && (!TileMap.IsWallTile(X + 1, Y)))
{
adjacentNodes.Add(new PathNode(
currentNode,
endNode,
new Vector2(X + 1, Y),
CostStraight + currentNode.DirectCost));
}
else
{
upRight = false;
downRight = false;
}
if ((Y > 0) && (!TileMap.IsWallTile(X, Y - 1)))
{
adjacentNodes.Add(new PathNode(
currentNode,
endNode,
new Vector2(X, Y - 1),
CostStraight + currentNode.DirectCost));
}
else
{
upLeft = false;
upRight = false;
}
if ((Y < 49) && (!TileMap.IsWallTile(X, Y + 1)))
{
adjacentNodes.Add(new PathNode(
currentNode,
endNode,
new Vector2(X, Y + 1),
CostStraight + currentNode.DirectCost));
}
else
{
downLeft = false;
downRight = false;
}
if ((upLeft) && (!TileMap.IsWallTile(X - 1, Y - 1)))
{
adjacentNodes.Add(new PathNode(
currentNode,
endNode,
new Vector2(X - 1, Y - 1),
CostDiagonal + currentNode.DirectCost));
}
if ((upRight) && (!TileMap.IsWallTile(X + 1, Y - 1)))
{
adjacentNodes.Add(new PathNode(
currentNode,
endNode,
new Vector2(X + 1, Y - 1),
CostDiagonal + currentNode.DirectCost));
}
if ((downLeft) && (!TileMap.IsWallTile(X - 1, Y + 1)))
{
adjacentNodes.Add(new PathNode(
currentNode,
endNode,
new Vector2(X - 1, Y + 1),
CostDiagonal + currentNode.DirectCost));
}
if ((downRight) && (!TileMap.IsWallTile(X + 1, Y + 1)))
{
adjacentNodes.Add(new PathNode(
currentNode,
endNode,
new Vector2(X + 1, Y + 1),
CostDiagonal + currentNode.DirectCost));
}
return(adjacentNodes);
}
private static Vector2 checkTileObstacles(
float elapsedTime,
Vector2 moveAngle)
{
Vector2 newHorizontalLocation = BaseSprite.WorldLocation +
(new Vector2(moveAngle.X, 0) * (playerSpeed * elapsedTime));
Vector2 newVerticalLocation = BaseSprite.WorldLocation +
(new Vector2(0, moveAngle.Y) * (playerSpeed * elapsedTime));
Rectangle newHorizontalRect = new Rectangle(
(int)newHorizontalLocation.X,
(int)BaseSprite.WorldLocation.Y,
BaseSprite.FrameWidth,
BaseSprite.FrameHeight);
Rectangle newVerticalRect = new Rectangle(
(int)BaseSprite.WorldLocation.X,
(int)newVerticalLocation.Y,
BaseSprite.FrameWidth,
BaseSprite.FrameHeight);
int horizLeftPixel = 0;
int horizRightPixel = 0;
int vertTopPixel = 0;
int vertBottomPixel = 0;
if (moveAngle.X < 0)
{
horizLeftPixel = (int)newHorizontalRect.Left;
horizRightPixel = (int)BaseSprite.WorldRectangle.Left;
}
if (moveAngle.X > 0)
{
horizLeftPixel = (int)BaseSprite.WorldRectangle.Right;
horizRightPixel = (int)newHorizontalRect.Right;
}
if (moveAngle.Y < 0)
{
vertTopPixel = (int)newVerticalRect.Top;
vertBottomPixel = (int)BaseSprite.WorldRectangle.Top;
}
if (moveAngle.Y > 0)
{
vertTopPixel = (int)BaseSprite.WorldRectangle.Bottom;
vertBottomPixel = (int)newVerticalRect.Bottom;
}
if (moveAngle.X != 0)
{
for (int x = horizLeftPixel; x < horizRightPixel; x++)
{
for (int y = 0; y < BaseSprite.FrameHeight; y++)
{
if (TileMap.IsWallTileByPixel(new Vector2(x, newHorizontalLocation.Y + y)))
{
moveAngle.X = 0;
break;
}
}
if (moveAngle.X == 0)
{
break;
}
}
}
if (moveAngle.Y != 0)
{
for (int y = vertTopPixel; y < vertBottomPixel; y++)
{
for (int x = 0; x < BaseSprite.FrameWidth; x++)
{
if (TileMap.IsWallTileByPixel(new Vector2(newVerticalLocation.X + x, y)))
{
moveAngle.Y = 0;
break;
}
}
if (moveAngle.Y == 0)
{
break;
}
}
}
return(moveAngle);
}
