/// <summary>
/// Finds the farthest block in dir direction, that has a same color block in check direction
/// </summary>
/// <param name="block"></param>
/// <param name="dir"></param>
/// <param name="check"></param>
private Block GetEndBlock(Block block, Direction dir, Direction checkDir)
{
Block current = null;
Block next;
Block nextAdj;
//Set current block
current = block;
//Iterate left
next = current.SameAdjacent(dir);
nextAdj = next?.SameAdjacent(checkDir);
while (next != null && nextAdj != null && next.IsGrouped() == false && nextAdj.IsGrouped() == false)
{
current = next;
next = current.SameAdjacent(dir);
nextAdj = next?.SameAdjacent(checkDir);
}
return(current);
}
private Block SameLeft(Block block)
{
return(block.SameAdjacent(Direction.left));
}
private Block SameDown(Block block)
{
return(block.SameAdjacent(Direction.down));
}
private Block SameRight(Block block)
{
return(block.SameAdjacent(Direction.right));
}
private Block SameUp(Block block)
{
return(block.SameAdjacent(Direction.up));
}
private bool SameColorLine(Block block, Direction dir, int length)
{
if (block == null || block.IsGrouped() == true)
{
return(false);
}
switch (dir)
{
case Direction.up:
for (int i = 0; i < length; i++)
{
block = block.SameAdjacent(Direction.up);
if (block == null || block.IsGrouped() == true)
{
return(false);
}
}
break;
case Direction.right:
for (int i = 0; i < length; i++)
{
block = block.SameAdjacent(Direction.right);
if (block == null || block.IsGrouped() == true)
{
return(false);
}
}
break;
case Direction.down:
for (int i = 0; i < length; i++)
{
block = block.SameAdjacent(Direction.down);
if (block == null || block.IsGrouped() == true)
{
return(false);
}
}
break;
case Direction.left:
for (int i = 0; i < length; i++)
{
block = block.SameAdjacent(Direction.left);
if (block == null || block.IsGrouped() == true)
{
return(false);
}
}
break;
default:
return(false);
}
return(true);
}
public BlockPosition BlockPos(Block block)
{
bool up = false, right = false, down = false, left = false;
bool upperLeft = false, upperRight = false, lowerLeft = false, lowerRight = false;
int adjacentCount = 0;
Block other = block.SameAdjacent(Direction.up);
//Check directly adjacent blocks
if (other != null && other.IsGrouped() == false)
{
adjacentCount++;
up = true;
}
other = block.SameAdjacent(Direction.right);
if (other != null && other.IsGrouped() == false)
{
adjacentCount++;
right = true;
}
other = block.SameAdjacent(Direction.down);
if (other != null && other.IsGrouped() == false)
{
adjacentCount++;
down = true;
}
other = block.SameAdjacent(Direction.left);
if (other != null && other.IsGrouped() == false)
{
adjacentCount++;
left = true;
}
//If 3 or more adjacent, check diagonals too
if (adjacentCount >= 3)
{
//check upper diagonals
other = GetBlock(block.X - 1, block.Y + 1);
if (block.SameColor(other) && other.IsGrouped() == false)
{
upperLeft = true;
}
other = GetBlock(block.X + 1, block.Y + 1);
if (block.SameColor(other) && other.IsGrouped() == false)
{
upperRight = true;
}
//Check lower diagonals
other = GetBlock(block.X - 1, block.Y - 1);
if (block.SameColor(other) && other.IsGrouped() == false)
{
lowerLeft = true;
}
other = GetBlock(block.X + 1, block.Y - 1);
if (block.SameColor(other) && other.IsGrouped() == false)
{
lowerRight = true;
}
}
if (adjacentCount == 2)
{
//Corner block
if (up && right)
{
//bottom left
return(BlockPosition.bottomLeft);
}
else if (right && down)
{
//top left
return(BlockPosition.topLeft);
}
else if (down && left)
{
// top right
return(BlockPosition.topRight);
}
else if (left && up)
{
//bottom right
return(BlockPosition.bottomRight);
}
//3 blocks in a row
}
else if (adjacentCount == 3)
{
//T shape
//Edge of rect
if (up && right && down)
{
//left edge
if (upperRight && lowerRight)
{
return(BlockPosition.left);
}
//bottom left
if (upperRight)
{
return(BlockPosition.bottomLeft);
}
//top right
if (lowerRight)
{
return(BlockPosition.topLeft);
}
}
else if (right && down && left)
{
//top edge
if (lowerLeft && lowerRight)
{
return(BlockPosition.top);
}
//top right
if (lowerLeft)
{
return(BlockPosition.topRight);
}
//top left
if (lowerRight)
{
return(BlockPosition.topLeft);
}
}
else if (down && left && up)
{
//right edge
if (upperLeft && lowerLeft)
{
return(BlockPosition.right);
}
//bottom right
if (upperLeft)
{
return(BlockPosition.bottomRight);
}
//top right
if (lowerLeft)
{
return(BlockPosition.topRight);
}
}
else if (left && up && right)
{
//bottom edge
if (upperLeft && upperRight)
{
return(BlockPosition.bottom);
}
//bottom left corner
if (upperRight)
{
return(BlockPosition.bottomLeft);
}
//bottom right corner
if (upperLeft)
{
return(BlockPosition.bottomRight);
}
}
}
else if (adjacentCount == 4)
{
//+ shape
//+ shape + 1 corner = group
if (upperLeft || upperRight || lowerLeft || lowerRight)
{
return(BlockPosition.middle);
}
//Middle block of group
if (upperLeft && upperRight && lowerLeft && lowerRight)
{
return(BlockPosition.middle);
}
}
return(BlockPosition.original);
}
