Algorithm 1: block location setting

1Function OPTIMAL BLOCKS{predefined workspace, selected tileset}:

2 define {$\mathit{w}({\mathit{w}}_{\mathit{r}},{\mathit{w}}_{\mathit{c}})$}

3i ←1, j ←1, t ←1

4 for alli, i ←1, do

5  for allj, j ←1, do

6   location$\mathit{w}(\mathit{i},\mathit{j})$ is COM of tile t:

7    if tile t is asymmetrical tile:

8     Locate: tile t blocks as Figure 8c

9    else if tile t is symmetrical tile:

10      Execute: shifting from $\mathit{t}-1$ to t

11      Find: blocks of tile having the similar heading with the heading after transforming

12      Locate: tile t blocks as Figure 8a,b

13    end

14   end

15  end

End Function