public ObjectGrid(int mWidth, int mHeight, int gWidth, int gHeight)
{
gridHeight = gHeight;
gridWidth = gWidth;
mapHeight = mHeight;
mapWidth = mWidth;
objects = new List<Entity>();
//created grids
int verticalGrids = mHeight/gHeight;
if (mHeight%gHeight != 0)
verticalGrids++;
int horizontalGrids = mWidth/gWidth;
if (mWidth%gWidth != 0)
horizontalGrids++;
grids = new Grid[horizontalGrids][];
for (int i = 0; i < horizontalGrids; i++)
{
grids[i]=new Grid[verticalGrids];
for (int j = 0; j < verticalGrids; j++)
{
grids[i][j]=new Grid();
}
}
}
//parameters are expected to be in arrays of x, y format
public List<Entity> GetActiveObjects(int[] upperLeftCorner, int[] upperRightCorner, int[] lowerLeftCorner, int[] lowerRightCorner)
{
List<Entity> activeObjects = new List<Entity>();
Grid[] foundGrid = new Grid[4];
foundGrid[0] = FindGrid(upperLeftCorner[0], upperLeftCorner[1]);
foundGrid[1] = FindGrid(upperRightCorner[0], upperRightCorner[1]);
foundGrid[2] = FindGrid(lowerLeftCorner[0], lowerLeftCorner[1]);
foundGrid[3] = FindGrid(lowerRightCorner[0], lowerRightCorner[1]);
//add grid objects to active objects list
//add grid0
activeObjects.AddRange(foundGrid[0].getObjects());
//add grid1 if it hasn't been added yet
if (foundGrid[1] != foundGrid[0])
{
activeObjects.AddRange(foundGrid[1].getObjects());
}
//add grid2 if it hasn't been
if (foundGrid[2] != foundGrid[1] && foundGrid[2] != foundGrid[0])
{
activeObjects.AddRange(foundGrid[2].getObjects());
}
//add final grid if it hasn't been
if (foundGrid[3] != foundGrid[2] && foundGrid[3] != foundGrid[1] && foundGrid[3] != foundGrid[0])
{
activeObjects.AddRange(foundGrid[3].getObjects());
}
return activeObjects;
}