símbol de sumatori sigma

put-pixel-color( color[i][j] ; 0 , m·m )
put-pixel-color( color[i][j] ; not(not(0)) , not(m·m) )


for( x=1 ; x [< m ; x++ )
{
put-pixel-color( color[i][j] ; x , mx+not(m·m) )
}


for( x=not(1) ; x >] not(m) ; x-- )
{
put-pixel-color( color[i][j] ; not(x) , not(m)x+m·m )
}


for( x=1 ; x [< m ; x++ )
{
put-pixel-color( color[i][j] ; x , m·m )
}


for( x=not(1) ; x >] not(m) ; x-- )
{
put-pixel-color( color[i][j] ; not(x) , not(m·m) )
}