/// <summary>
/// Remove a UIBox from all the cells it currently intersects. This is the opposite of PlaceUIBox()
/// </summary>
/// <param name="item">UIBox reference to remove</param>
public void RemoveUIBox(UIBox item)
{
//Get the start and end positions
int startCol = Utils.Clamp(0, this.cellNum, (int)Math.Floor((double)item.boundaries.X / this.cellWidth));
int endCol = Utils.Clamp(0, this.cellNum, (int)Math.Ceiling((double)(item.boundaries.X + item.boundaries.Width) / this.cellWidth));
int startRow = Utils.Clamp(0, this.cellNum, (int)Math.Floor((double)item.boundaries.Y / this.cellHeight));
int endRow = Utils.Clamp(0, this.cellNum, (int)Math.Ceiling((double)(item.boundaries.Y + item.boundaries.Height) / this.cellHeight));
//Loop through all sections that the object intersects with
int h = startRow;
do
{
int w = startCol;
do
{
//Remove this item from that cell's list
this.dataGrid[h][w].Remove(item);
w++;
} while (w <= endCol);
h++;
} while (h <= endRow);
}
/// <summary>
/// Take a UIBox and place it in all grid cells intersecting with it
/// </summary>
/// <param name="item">UIBox to place</param>
public void PlaceUIBox(UIBox item)
{
//Get the start and end positions
int startCol = Utils.Clamp(0, this.cellNum, (int)Math.Floor((double)item.boundaries.X / this.cellWidth));
int endCol = Utils.Clamp(0, this.cellNum, (int)Math.Ceiling((double)(item.boundaries.X + item.boundaries.Width) / this.cellWidth));
int startRow = Utils.Clamp(0, this.cellNum, (int)Math.Floor((double)item.boundaries.Y / this.cellHeight));
int endRow = Utils.Clamp(0, this.cellNum, (int)Math.Ceiling((double)(item.boundaries.Y + item.boundaries.Height) / this.cellHeight));
//Loop through all sections that the object intersects with. Use a do/while loop in case the entire UIBox fits into the 0, 0 cell
int h = startRow;
do
{
int w = startCol;
do
{
//Add this item to that cell's list
this.dataGrid[h][w].Add(item);
w++;
} while (w < endCol);
h++;
} while (h < endRow);
}
/// <summary>
/// Swaps two items in a UIBox list
/// </summary>
/// <param name="arr">UIBox list with items to swap</param>
/// <param name="targ">Index of the item to swap with dest</param>
/// <param name="dest">Index of the item to swap with targ</param>
public static void SwapUIBox(List <UI.UIBox> arr, int targ, int dest)
{
UI.UIBox temp = arr[dest];
arr[dest] = arr[targ];
arr[targ] = temp;
}
