private DropItem AddAll(DropItem to, int x, int y)
{
if (x > 0 && y > 0 && x < xc && y < yc)
{
var items = matrix[x][y];
while (items.Next != null)
{
items = items.Next;
to.Next = new DropItem(items.Dropdata);
to = to.Next;
}
}
return to;
}
private bool Collision_Sample(CanvasDrawingSession context, Drop drop, DropItem collisions)
{
DropItem item = collisions;
Drop drop2 = null;
while (item != null)
{
Drop p = item.Dropdata;
if (Math.Sqrt(Math.Pow(drop.X - p.X, 2) + Math.Pow(drop.Y - p.Y, 2)) < (drop.R + p.R))
{
drop2 = p;
break;
}
item = item.Next;
}
if (drop2 == null)
{
return false;
}
// rename so that we're dealing with low/high drops
Drop higher, lower;
if (drop.Y > drop2.Y)
{
higher = drop;
lower = drop2;
}
else
{
higher = drop2;
lower = drop;
}
// force stopping the second drop
ClearDrop(context, lower);
ClearDrop(context, higher, true);
matrix.Remove(higher);
lower.Draw(this, context);
lower.Colliding = higher;
lower.Collided = true;
return true;
}
public DropItem(Drop drop)
{
dropdata = drop;
next = null;
}
public DropItem Collisions(Drop drop)
{
var item = new DropItem(null);
var first = item;
item = AddAll(item, drop.Gmx - 1, drop.Gmy + 1);
item = AddAll(item, drop.Gmx, drop.Gmy + 1);
item = AddAll(item, drop.Gmx + 1, drop.Gmy + 1);
return first;
}