public void insertItems(List <Item> items)
{
tree.insertItems(items, depth, leftB, topB, rightB, bottomB);
}
public void insertItems(List <Item> items, int depth, float leftB, float topB, float rightB, float bottomB)
{
// If we've reached the maximum depth then insert all items into this
// quadrant.
depth--;
if (depth == 0)
{
foreach (Item i in items)
{
if (!landuses.Contains(i.landuseId))
{
landuses.Add(i.landuseId);
}
}
return;
}
// Find this quadrant's centre.
cx = Convert.ToSingle((leftB + rightB) * 0.5);
cy = Convert.ToSingle((topB + bottomB) * 0.5);
List <Item> nw_items = new List <Item>();
List <Item> sw_items = new List <Item>();
List <Item> se_items = new List <Item>();
List <Item> ne_items = new List <Item>();
foreach (Item item in items)
{
//check if landuse already in landuses
if (landuses.Contains(item.landuseId))
{
continue;
}
//check if node is in item
if (item.left < leftB && item.top > topB && item.right > rightB && item.bottom < bottomB)
{
landuses.Add(item.landuseId);
continue;
}
//Which of the sub-quadrants does the item overlap?
bool in_nw = (item.left <= cx && item.top >= cy);
bool in_sw = (item.left <= cx && item.bottom <= cy);
bool in_ne = (item.right >= cx && item.top >= cy);
bool in_se = (item.right >= cx && item.bottom <= cy);
if (in_nw)
{
nw_items.Add(item);
}
if (in_ne)
{
ne_items.Add(item);
}
if (in_se)
{
se_items.Add(item);
}
if (in_sw)
{
sw_items.Add(item);
}
}
//Create the sub-quadrants, recursively.
if (nw_items.Count > 0)
{
if (nw == null)
{
nw = new Quadtree(nw_items, depth, leftB, topB, cx, cy);
}
else
{
nw.insertItems(nw_items, depth, leftB, topB, cx, cy);
}
}
if (ne_items.Count > 0)
{
if (ne == null)
{
ne = new Quadtree(ne_items, depth, cx, topB, rightB, cy);
}
else
{
ne.insertItems(ne_items, depth, cx, topB, rightB, cy);
}
}
if (se_items.Count > 0)
{
if (se == null)
{
se = new Quadtree(se_items, depth, cx, cy, rightB, bottomB);
}
else
{
se.insertItems(se_items, depth, cx, cy, rightB, bottomB);
}
}
if (sw_items.Count > 0)
{
if (sw == null)
{
sw = new Quadtree(sw_items, depth, leftB, cy, cx, bottomB);
}
else
{
sw.insertItems(sw_items, depth, leftB, cy, cx, bottomB);
}
}
}