coordtransform 0.3.0

Provide mutual conversions between Baidu Coordinate System (BD09), Mars Coordinate System (GCJ02), and WGS84 Coordinate System.
Documentation 
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use coordtransform::*;

fn main() {
    println!("Coordinates transformation examples");
    println!("=============");

    let test_lon = 116.404;
    let test_lat = 39.915;

    println!("Original Coordinates: ({}, {})", test_lon, test_lat);
    println!();

    // BD09 -> GCJ02
    let (lon, lat) = bd09_to_gcj02(test_lon, test_lat);
    println!("BD09 -> GCJ02: ({:.10}, {:.10})", lon, lat);

    // GCJ02 -> BD09
    let (lon, lat) = gcj02_to_bd09(test_lon, test_lat);
    println!("GCJ02 -> BD09: ({:.10}, {:.10})", lon, lat);

    // WGS84 -> GCJ02
    let (lon, lat) = wgs84_to_gcj02(test_lon, test_lat);
    println!("WGS84 -> GCJ02: ({:.10}, {:.10})", lon, lat);

    // GCJ02 -> WGS84
    let (lon, lat) = gcj02_to_wgs84(test_lon, test_lat);
    println!("GCJ02 -> WGS84: ({:.10}, {:.10})", lon, lat);

    // BD09 -> WGS84
    let (lon, lat) = bd09_to_wgs84(test_lon, test_lat);
    println!("BD09 -> WGS84: ({:.10}, {:.10})", lon, lat);

    // WGS84 -> BD09
    let (lon, lat) = wgs84_to_bd09(test_lon, test_lat);
    println!("WGS84 -> BD09: ({:.10}, {:.10})", lon, lat);

    println!();
    println!("EPSG:3857 (Web Mercator) transformations:");

    // WGS84 -> EPSG:3857
    let (x, y) = wgs84_to_epsg3857(test_lon, test_lat);
    println!("WGS84 -> EPSG:3857: ({:.2}, {:.2})", x, y);

    // EPSG:3857 -> WGS84
    let (lon, lat) = epsg3857_to_wgs84(x, y);
    println!("EPSG:3857 -> WGS84: ({:.10}, {:.10})", lon, lat);

    // GCJ02 -> EPSG:3857
    let (x, y) = gcj02_to_epsg3857(test_lon, test_lat);
    println!("GCJ02 -> EPSG:3857: ({:.2}, {:.2})", x, y);

    // EPSG:3857 -> GCJ02
    let (lon, lat) = epsg3857_to_gcj02(x, y);
    println!("EPSG:3857 -> GCJ02: ({:.10}, {:.10})", lon, lat);

    // BD09 -> EPSG:3857
    let (x, y) = bd09_to_epsg3857(test_lon, test_lat);
    println!("BD09 -> EPSG:3857: ({:.2}, {:.2})", x, y);

    // EPSG:3857 -> BD09
    let (lon, lat) = epsg3857_to_bd09(x, y);
    println!("EPSG:3857 -> BD09: ({:.10}, {:.10})", lon, lat);

    println!();
    println!("Test coordinates outside of China (should remain unchanged):");
    let (lon, lat) = wgs84_to_gcj02(0.0, 0.0);
    println!("WGS84 -> GCJ02 (outside China): ({}, {})", lon, lat);
}