Class CmdlineOptions

tools/streamline.rs:39–130

#[derive(Debug, Parser)]
#[clap(name = "streamline", verbatim_doc_comment)]
struct CmdlineOptions {
    /// The log level
    #[clap(short, long, default_value_t = tracing::Level::INFO)]
    log_level: tracing::Level,

    /// Input file to read input from. Defaults to stdin.
    #[clap(short, long)]
    input: Option<PathBuf>,

    /// Output file to write result to. Defaults to stdout.
    #[clap(short, long)]
    output: Option<PathBuf>,

    /// A Rune script that defines the vector field. If not given, a Perlin noise field will be
    /// used instead.
    ///
    /// Example:
    ///
    ///     let temp = f64::sqrt(x.powf(2.0) + y.powf(2.0) + 4.0);
    ///     let x_new = -f64::sin(x) / temp;
    ///     let y_new = y / temp;
    ///
    /// I.e., the f64 x, y variables are inputs, and the x_new, y_new variables are outputs.
    ///
    /// May be given multiple times for multi-line functions.
    #[clap(short, long)]
    function: Vec<String>,

    /// The random seed to use. Use zero to let the tool pick its own random seed.
    #[clap(long, default_value_t = 0)]
    seed: u64,

    /// The minimum x coordinate of the vector field
    #[clap(short = 'x', long, default_value_t = 0.0)]
    min_x: f64,

    /// The maximum x coordinate of the vector field
    #[clap(short = 'X', long, default_value_t = 20.0)]
    max_x: f64,

    /// The minimum y coordinate of the vector field
    #[clap(short = 'y', long, default_value_t = 0.0)]
    min_y: f64,

    /// The maximum y coordinate of the vector field
    #[clap(short = 'Y', long, default_value_t = 20.0)]
    max_y: f64,

    /// The vector field grid spacing
    #[clap(short = 'd', long, default_value_t = 0.5)]
    delta_h: f64,

    /// The size of each time step
    #[clap(short = 't', long, default_value_t = 0.1)]
    delta_t: f64,

    /// The number of time steps to make
    #[clap(short = 'T', long, default_value_t = 10)]