// pro správný vstup vrací pole se souřadnicemi x a y na prvním
// a druhém prvku pole, pro špatný vstup vrací null
private static int[] IsInput(string s)
{
if (s.Length == 2)
{
char first = s.ToCharArray() [0];
char second = s.ToCharArray() [1];
if (first >= 'a' && first < 'a' + g.GetWidth() &&
second >= '1' && second <= '9')
{
return(new int[2] {
first - 'a', second - '1'
});
}
else if (second >= 'a' && second < 'a' + g.GetWidth() &&
first >= '1' && first <= '9')
{
return(new int[2] {
second - 'a', first - '1'
});
}
}
else if (s.Length == 3)
{
char first = s.ToCharArray() [0];
char second = s.ToCharArray() [1];
char third = s.ToCharArray() [2];
if (first >= 'a' && first < 'a' + g.GetWidth())
{
if ((second >= '0' && second <= '0' + g.GetHeight() / 10) &&
(third >= '0' && third <= '9'))
{
int y = (second - '0') * 10 + (third - '1');
if (y > g.GetHeight())
{
return(null);
}
return(new int[2] {
first - 'a', y
});
}
}
else if (third >= 'a' && third < 'a' + g.GetWidth())
{
if ((first >= '0' && first <= '0' + g.GetHeight() / 10) &&
(second >= '0' && second <= '9'))
{
int y = (first - '0') * 10 + (second - '1');
if (y > g.GetHeight())
{
return(null);
}
return(new int[2] {
third - 'a', y
});
}
}
}
return(null);
}