private int ComputeShadowDistance()
{
var min = Playfield.Height;
// For each row within the piece
foreach (var(x, y) in GetPieceFieldCoordinates())
{
// If a shadow block
if (UserPiece.IsShadowBlock(x - X, y - Y, Rotation))
{
// Cast down to find nearest intercepting solid row
var row = Playfield.CastDown(x, y, true) - 1;
//
var dist = row - y;
// Was underground
if (dist < 0)
{
// How much of a vertical is needed to push up?
dist = Playfield.CastUp(x, y, false) - y;
}
// Store minimum distance found
min = Math.Min(min, dist);
}
}
return(min);
}