public void AddClaim(Claim claim)
{
for (var i = claim.Left; i < claim.Right; ++i)
{
for (var j = claim.Top; j < claim.Bottom; ++j)
{
foreach (var conflictingClaim in canvas[i, j])
{
claim.ConflictsWith(conflictingClaim);
}
canvas[i, j].Add(claim);
}
}
}