Example #1
0
func continuedFraction(a float64, dSquaredFloorTimesTwo int) vector.IntVector {

	aFloor := int(math.Floor(a))

	var ret vector.IntVector

	if dSquaredFloorTimesTwo == aFloor {
		return ret
	}

	ret.Push(aFloor)

	nextRet := continuedFraction(1/(a-float64(aFloor)), dSquaredFloorTimesTwo)

	ret.AppendVector(&nextRet)

	return ret
}
Example #2
0
// apply color to vertex, modifying board and updating liberties of any go_adj strings
func (t *GoTracker) Play(color byte, vertex int) {
	if vertex != -1 {
		t.passes = 0

		if t.koVertex != -1 {
			t.weights.Set(t.koColor, t.koVertex, INIT_WEIGHT)
			t.koVertex = -1
			t.koColor = EMPTY
		}

		if t.superko {
			if t.history.Len() == 0 {
				t.history.Push(*NewHash(t.boardsize))
			}
			cp := t.Copy()
			cp.(*GoTracker).superko = false
			cp.Play(color, vertex)
			t.history.Push(*MakeHash(cp))
		}

		// modify the board
		t.board[vertex] = color

		// update parents and liberties of adjacent stones

		opp := Reverse(color)
		root := vertex
		for i := 0; i < 4; i++ {
			adj := t.adj[vertex][i]
			if adj != -1 && t.board[adj] == color {
				adj := find(adj, t.parent)
				// take adjacent chain out of atari (may be added back later)
				t.atari[color][adj] = 0, false
				// or in liberties to friendly chains
				new_root, old_root := union(root, adj, t.parent, t.rank)
				t.liberties[new_root][0] |= t.liberties[old_root][0]
				t.liberties[new_root][1] |= t.liberties[old_root][1]
				// xor out liberty from self
				t.liberties[new_root][0] &= ^t.mask[adj][0]
				t.liberties[new_root][1] &= ^t.mask[adj][1]
				root = new_root
			} else if adj != -1 && t.board[adj] == EMPTY {
				// xor out liberty from empty vertices
				t.liberties[adj][0] &= ^t.mask[vertex][0]
				t.liberties[adj][1] &= ^t.mask[vertex][1]
			} else if adj != -1 {
				// xor out liberties from enemy chains
				enemy := find(adj, t.parent)
				t.liberties[enemy][0] &= ^t.mask[vertex][0]
				t.liberties[enemy][1] &= ^t.mask[vertex][1]
			}
		}
		// xor out liberty from self
		t.liberties[root][0] &= ^t.mask[vertex][0]
		t.liberties[root][1] &= ^t.mask[vertex][1]

		// capture any adjacent enemies reduced to zero liberties
		var captured *vector.IntVector
		for i := 0; i < 4; i++ {
			adj := t.adj[vertex][i]
			if adj != -1 && t.board[adj] == opp {
				enemy := find(adj, t.parent)
				libs := t.libs(enemy)
				if libs == 0 {
					// take chain out of atari
					t.atari[opp][enemy] = 0, false
					if captured == nil {
						captured = t.capture(enemy)
					} else {
						captured.AppendVector(t.capture(enemy))
					}
				}
			}
		}

		// check for suicide of affected empty points
		for i := 0; i < 4; i++ {
			adj := t.adj[vertex][i]
			if adj != -1 && t.board[adj] == EMPTY && t.libs(adj) == 0 {
				t.check_suicide(adj)
			} else if adj != -1 && (t.board[adj] == BLACK || t.board[adj] == WHITE) {
				adj = find(adj, t.parent)
				if t.libs(adj) == 1 {
					last_liberty := t.lastliberty(adj)
					if t.libs(last_liberty) == 0 {
						t.check_suicide(last_liberty)
					}
				}
			}
		}

		// ko check
		if captured != nil && captured.Len() == 1 {
			capture := captured.At(0)
			t.check_suicide(capture)
			if t.libs(root) == 1 {
				t.koColor = opp
				t.koVertex = capture
			}
		}

		// check if capture took adjacent chains out of atari
		// if so, check suicide status of their previous last liberty
		for i := 0; captured != nil && i < captured.Len(); i++ {
			capture := captured.At(i)
			for j := 0; j < 4; j++ {
				adj := t.adj[capture][j]
				if adj != -1 && t.board[adj] == color {
					adj = find(adj, t.parent)
					if last_liberty, exists := t.atari[color][adj]; exists {
						t.check_suicide(last_liberty)
						t.atari[color][adj] = 0, false
					}
				}
			}
		}

		// cannot play on occupied vertex
		t.weights.Set(BLACK, vertex, 0)
		t.weights.Set(WHITE, vertex, 0)

		// update atari status of adjacent chains
		for i := 0; i < 4; i++ {
			adj := t.adj[vertex][i]
			if adj != -1 && (t.board[adj] == BLACK || t.board[adj] == WHITE) {
				adj = find(adj, t.parent)
				if t.libs(adj) == 1 {
					t.atari[t.board[adj]][adj] = t.lastliberty(adj)
				}
			}
		}

		// update atari status of current chain
		if t.libs(root) == 1 {
			t.atari[color][root] = t.lastliberty(root)
		}

		// apply patterns
		neighbors := t.neighbors[1][vertex]
		for i := range neighbors {
			if neighbors[i] != -1 && t.board[neighbors[i]] == EMPTY {
				t.updateWeights(neighbors[i])
			}
		}
		for i := 0; captured != nil && i < captured.Len(); i++ {
			t.updateWeights(captured.At(i))
		}

		// mark vertex as played for AMAF
		if t.played[vertex] == EMPTY {
			t.played[vertex] = color
		}

	} else {
		t.passes++
	}
	t.moves.Push(vertex)
}