//50 Copy Solve to an IEnumerator
/// <summary>
/// Animates the solution of the tower
/// </summary>
/// <returns>Each step of the solution</returns>
IEnumerator AnimatedSolution()
{
//51 Add the Y iteration to the begining
for (int y = 0; y < _voxelGrid.GridSize.y; y++)
{
for (int x = 0; x < _voxelGrid.GridSize.x; x++)
{
for (int z = 0; z < _voxelGrid.GridSize.z; z++)
{
SudokuVoxel sVoxel = (SudokuVoxel)_voxelGrid.Voxels[x, y, z];
if (sVoxel.State == 0)
{
for (int i = 1; i < 10; i++)
{
if (Possible(sVoxel, i))
{
sVoxel.ChangeState(i);
//52 Add yield return after changing the state
yield return(new WaitForSeconds(0.1f));
//53 Start recursion with Coroutine
StartCoroutine(AnimatedSolution());
if (GameAsList(y).Count(v => v.State == 0) != 0)
{
sVoxel.ChangeState(0);
//54 Add yield return after backtracking
yield return(new WaitForSeconds(0.1f));
}
}
}
//55 Switch return to yield return
yield return(new WaitForSeconds(0.1f));
}
}
}
//56 Switch return to yield return
yield return(new WaitForSeconds(0.15f));
}
}
//38 Create the Solve method for a single layer
/// <summary>
/// Solves the a layer(game) of the tower
/// </summary>
/// <param name="y">The y coordinate of the game to be solved</param>
private void Solve(int y)
{
//39 Iterate through X and Z indexes of layer Y
for (int x = 0; x < _voxelGrid.GridSize.x; x++)
{
for (int z = 0; z < _voxelGrid.GridSize.z; z++)
{
//40 Get the SudokuVoxel to be evalauted, casting from Voxel
SudokuVoxel sVoxel = (SudokuVoxel)_voxelGrid.Voxels[x, y, z];
//41 Test if state of SudokuVoxel is 0 (empty cell)
if (sVoxel.State == 0)
{
//42 Try to change to the numbers between 1 and 9
for (int i = 1; i < 10; i++)
{
if (Possible(sVoxel, i))
{
//43 If it is possible, change it
sVoxel.ChangeState(i);
//44 Initiate the process again, moving to the next empty cell, recursively
Solve(y);
//45 This step is only reached if the solution succedded or failed
//Count the amount of empty spaces to see if solution succeeded
if (GameAsList(y).Count(v => v.State == 0) != 0)
{
//47 If solution failed, change the state of this voxel back to 0, backtracking
sVoxel.ChangeState(0);
}
}
}
//48 Exit method if all numbers have been tested and failed
return;
}
}
}
return;
}
