利用Rust编写一个简单的字符串时钟

    let five_seconds = Duration::new(5, 0);
    let five_seconds_and_five_nanos = five_seconds + Duration::new(0, 10);

    assert_eq!(five_seconds_and_five_nanos.as_secs(), 5);
    assert_eq!(five_seconds_and_five_nanos.subsec_nanos(), 10);



    let five_seconds = Duration::from_secs(5);
    assert_eq!(five_seconds, Duration::from_millis(5_000));
    assert_eq!(five_seconds, Duration::from_micros(5_000_000));
    assert_eq!(five_seconds, Duration::from_nanos(5_000_000_000));

    let ten_seconds = Duration::from_secs(10);
    let seven_nanos = Duration::from_nanos(7);
    let total = ten_seconds + seven_nanos;
    assert_eq!(total, Duration::new(10, 7));

    let local:DateTime<Local>= Local::now();
    println!("{:?}", local.fORMat("%Y-%m-%d %H:%M:%S").to_string());
    println!("{:?}", local.format("%a %b %e %T %Y").to_string());
    println!("{:?}", local.format("%c").to_string());
    println!("{:?}", local.to_string());
    println!("{:?}", local.to_rfc2822());
    println!("{:?}", local.to_rfc3339());

    let dt = Local.with_ymd_and_hms(2020 as i32, 12, 05, 12, 0, 9).unwrap();
    println!("{:?}", dt.format("%Y-%m-%d %H:%M:%S").to_string());
    println!("{:?}", dt.format("%a %b %e %T %Y").to_string());
    println!("{:?}", dt.format("%c").to_string());
    println!("{:?}", dt.to_string());
    println!("{:?}", dt.to_rfc2822());
    println!("{:?}", dt.to_rfc3339());

let curdate =  Local::now();
let datecollect = curdate.format("%H:%M:%S").to_string();

    let cur_dir = std::env::current_dir().unwrap().
        into_os_string().into_string().unwrap();

    let _path = if number == ':' {
        format!("{}/number_pic/{}.png", &cur_dir, "maohao")
    }
    else{
        format!("{}/number_pic/{}.png", &cur_dir, number)
    };

    // println!("imagepath = {}", _path);
    let gray_pic = image::open(_path).unwrap()
    .resize(nwidth, nheight, image::imageops::FilterType::Nearest)
    .into_luma8();

pub struct pix_clock {
    Words : HashMap<char, Vec<String>>,
}


impl pix_clock {
    pub fn new() -> pix_clock {
        let mut dict_result = HashMap::new();
        let numbers = vec!['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', ':'];
        for value in numbers {
            let result = get_num_pic(value);
            dict_result.insert(value, result);
            // println!("num={} {:#?}", value, dict_result[&value]);
        }

        return pix_clock {
            words: dict_result,
        };
    }
}

   let mut pix_data: Vec<String> = vec![];
    let mut line = String::from("");
    for (index, tmp) in gray_pic.to_vec().iter().enumerate() {
        if index % nwidth as usize == 0 {
            if line.len()>0 {
                let line2 = line.clone();
                pix_data.push(line2);
            }
            line.clear();
        }
        if tmp > &gap_value {
            line.push_str("*");
        }
        else {
            line.push_str(" ");
        }
    }

result data 3 [
    "*************",
    "*************",
    "****** ******",
    "***       ***",
    "***       ***",
    "***  ***   **",
    "********   **",
    "*******   ***",
    "****      ***",
    "****      ***",
    "*******    **",
    "********   **",
    "*********  **",
    "**   ***   **",
    "**        ***",
    "***       ***",
    "*****   *****",
    "*************",
    "*************",
]

let time_str = datestr.chars(); // 把字符串解析为char型字符
let mut final_vector: Vec<String> = vec![];
for _index in 0..self.words.get(&'0').unwrap().len() { // 合并后的图案高度不变，即行数不变
    final_vector.push("".to_string()); // 每行的字符串变长了，先预留空String来接收每行字符
}

for value in time_str { //遍历时间字符串的每个字符
    let value_pix = self.words.get(&value).unwrap(); //获取单个字符的图案
    let mut index = 0;
    for x in value_pix.iter() {
        final_vector[index].push_str(&x); # 每个字符相同行的字符串合并为一个大字符串
        index += 1;
      }
}

for temp in final_vector { // 合并后的字符串，高度不变（即行数不变）
   println!("{}", format!("{}", temp));  // 打印合并后的字符串，按行显示
}
println!("");

fn main() {
    let pix_clock = pix_clock::new();
    let delay = time::Duration::from_secs(1);
    loop {
        let curdate =  Local::now();
        let datecollect = curdate.format("%H:%M:%S").to_string();
        pix_clock.beautifyshow(&datecollect);
        thread::sleep(delay);
        Clear(ClearType::All);
    }
}