/// <summary>
/// If cells in m_highlightPositions forms one block, add block in m_puzzle, and draw the block. Otherwise, do nothing.
/// </summary>
/// <returns>PlacedBlock if block is found, null otherwise</returns>
private PlacedBlock FindAndHighlightBlockMaybe()
{
if (m_highlightPositions.Count == 0)
{
return(null);
}
int minX = m_highlightPositions.Select(pos => pos.x).Min();
int minY = m_highlightPositions.Select(pos => pos.y).Min();
int maxX = m_highlightPositions.Select(pos => pos.x).Max();
int maxY = m_highlightPositions.Select(pos => pos.y).Max();
if (maxX - minX > 3 || maxY - minY > 3)
{
return(null);
}
int[,] hlBlockIndex = new int[4, 4];
for (int i = 0; i < 4; i++)
{
for (int j = 0; j < 4; j++)
{
if (m_highlightPositions.Contains(new Position(minX + i, minY + j)))
{
hlBlockIndex[i, j] = 1;
}
}
}
foreach (string name in BlockFactory.m_blockNames)
{
Block b = BlockFactory.GetBlockByName(name);
for (int i = 0; i < b.m_varients.Count; i++)
{
if (BlockFactory.ArrayEquals(b.m_varients[i], hlBlockIndex))
{
PlacedBlock pb = new PlacedBlock(b, i, minX, minY);
return(pb);
}
}
}
return(null);
}