public void DestroyList(int startX, int endX, int startY, int endY)
{
int index = (halfHeight * 2 + 1) * (halfWidth * 2 + 1);
int i;
for (i = halfHeight; i >= -halfHeight; i--)
{
for (int j = -halfWidth; j <= halfWidth; j++)
{
index--;
if (i <= startY && i >= endY && j >= startX && j <= endX)
{
list.DestroyItem(index);
}
}
}
}