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88 lines
1.6 KiB

10 months ago
struct Step {
i: i8,
j: i8
}
struct Steps {
l: usize,
i: usize,
j: usize,
k: usize,
s: usize
}
impl Steps {
fn new(n: usize) -> Steps {
return Steps {
i: n / 2,
j: n / 2,
l: 1,
k: 1,
s: 0,
};
}
fn ads(&mut self, s: &Step) {
if s.i < 0 { self.i -= 1; }
if s.i > 0 { self.i += 1; }
if s.j < 0 { self.j -= 1; }
if s.j > 0 { self.j += 1; }
}
fn next(&mut self) {
let mut sts = Vec::new();
sts.push(Step { i: 0, j: 1 });
sts.push(Step { i: -1, j: 0 });
sts.push(Step { i: 0, j: -1 });
sts.push(Step { i: 1, j: 0 });
if self.k > self.l {
self.k = 1;
self.s += 1;
if self.s == sts.len() {
self.s = 0;
self.l += 1;
}
if self.s == 2 {
self.l += 1;
}
}
let st = &sts[self.s];
self.k += 1;
self.ads(st)
}
}
fn print() {
let n = 7usize;
let mut m = Vec::<Vec<u32>>::new();
for i in 0..n {
let mut l = Vec::<u32>::new();
for j in 0..n {
l.push(0);
}
m.push(l);
}
let mut st = Steps::new(n);
for i in 1..20 {
m[st.i][st.j] = i;
st.next();
}
for i in 0..n {
let l = &m[i];
for j in 0..n {
print!("{}\t", l[j]);
}
println!("");
}
}
fn main() {
println!("hello world");
print();
}