// Returns an instance of Player
public Player createPlayer(Vector2 pos)
{
Player p = new Player(textures[MAINPLAYER], textures[MAINPLAYER]);
p.Position = pos;
return p;
}
public HUD createHUD(Player player)
{
return new HUD(textures[INFECT_RANGE], textures[HEALTH_BAR]);
}
/*
* Handle collision between player and item
*/
private bool CheckItemCollision(Player player, Item item)
{
if (player.distance(item) < (player.Size + Item.ITEM_SIZE)/2)
{
player.PickupItem(item);
return true;
}
return false;
}
/*
* Calculates and processes all collisions that occur,
* using the collision cell optimization structure
*/
public void Update(List<GameUnit> units, Player player, Level level, ItemController item_controller)
{
ConstructCollisionGrids(units, item_controller.Items, player, level);
foreach (GameUnit unit in units)
{
ProcessCollisions(unit, level.Map);
}
if (player != null)
{
ProcessCollisions(player, level.Map);
ProcessItems(player, item_controller);
}
}
/*
* Process item pickups
*/
public void ProcessItems(Player player, ItemController item_controller)
{
int x_indexp = (int)MathHelper.Clamp((player.Position.X / CELL_SIZE), 0, itemGrid.GetLength(1) - 1);
int y_indexp = (int)MathHelper.Clamp((player.Position.Y / CELL_SIZE), 0, itemGrid.GetLength(0) - 1);
List<Point> adjacent = getAdjacent(new Point(x_indexp, y_indexp));
foreach (Point loc in adjacent)
{
if (itemGrid[loc.Y, loc.X] != null)
{
foreach (Item it in itemGrid[loc.Y, loc.X])
{
if (CheckItemCollision(player, it))
{
item_controller.RemoveItem(it);
}
}
}
}
}
/*
* Populates the collision grid by bucketizing each unit on the map into a cell
* around which collisions will be processed
*/
public void ConstructCollisionGrids(List<GameUnit> units, List<Item> items,
Player player, Level level)
{
// Construct unit collision grid
List<GameUnit>[,] grid = new List<GameUnit>[
(int)level.Width / CELL_SIZE, (int)level.Height / CELL_SIZE];
foreach (GameUnit unit in units)
{
int x_index = (int)MathHelper.Clamp((unit.Position.X / CELL_SIZE), 0, grid.GetLength(1)-1);
int y_index = (int)MathHelper.Clamp((unit.Position.Y / CELL_SIZE), 0, grid.GetLength(0)-1);
if (grid[y_index, x_index] == null)
{
grid[y_index, x_index] = new List<GameUnit>();
}
grid[y_index, x_index].Add(unit);
}
if (player != null)
{
int x_indexp = (int)MathHelper.Clamp((player.Position.X / CELL_SIZE), 0, grid.GetLength(1) - 1);
int y_indexp = (int)MathHelper.Clamp((player.Position.Y / CELL_SIZE), 0, grid.GetLength(0) - 1);
if (grid[y_indexp, x_indexp] == null)
{
grid[y_indexp, x_indexp] = new List<GameUnit>();
}
grid[y_indexp, x_indexp].Add(player);
cellGrid = grid;
}
// Contruct item collision grid
itemGrid = new List<Item>[(int)level.Width / CELL_SIZE, (int)level.Height / CELL_SIZE];
foreach (Item item in items)
{
int x_index = (int)MathHelper.Clamp((item.Position.X / CELL_SIZE), 0, grid.GetLength(1) - 1);
int y_index = (int)MathHelper.Clamp((item.Position.Y / CELL_SIZE), 0, grid.GetLength(0) - 1);
if (itemGrid[y_index, x_index] == null)
{
itemGrid[y_index, x_index] = new List<Item>();
}
itemGrid[y_index, x_index].Add(item);
}
}