sailor 0.1.0

A sailing navigation application.
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mod tile_id;
mod tile_field;
mod screen;

use std::f32::consts::PI;
use lyon::math::{
    Point,
    point,
    vector,
};

pub use tile_id::*;
pub use tile_field::*;
pub use screen::*;

fn deg2rad(deg: f32) -> f32 {
    2.0 * PI * deg / 360.0
}

pub fn deg2num(lat_deg: f32, lon_deg: f32, zoom: u32) -> TileCoordinate {
    let lat_rad = deg2rad(lat_deg);
    let n = 2f32.powi(zoom as i32);
    let xtile = (lon_deg + 180.0) / 360.0 * n;
    let ytile = (
        1.0 - (
            lat_rad.tan() + 1.0 / lat_rad.cos()
        ).ln() / PI
    ) / 2.0 * n;

    TileCoordinate::new(zoom, xtile, ytile)
}

pub fn num_to_global_space(coordinate: &TileCoordinate) -> Point {
    point(0.0, 0.0) + vector(coordinate.x, coordinate.y) * 1.0/2f32.powi(coordinate.z as i32)
}

pub fn global_to_num_space(point: &Point, z: u32) -> TileCoordinate {
    let p = *point / 2f32.powi(-(z as i32));
    TileCoordinate::new(z, p.x, p.y)
}