### Start Python HTTP Server

Source: https://github.com/3liz/proj4rs/blob/main/js/README.md

Use this command to start a local Python HTTP server. This is required to run the WASM examples in a browser due to security restrictions.

```bash
python3 -m http.server
```

--------------------------------

### Configure package.json for npm Publishing

Source: https://github.com/3liz/proj4rs/blob/main/proj4rs/README_WASM.md

Example configuration for the 'files' field in package.json to include necessary artifacts for npm publishing.

```json
"files": [
    "proj4rs_bg.wasm",
    "proj4rs_bg.wasm.d.ts",
    "proj4rs.js",
    "proj4rs_bg.js",
    "proj4rs.d.ts",
    "proj4.js"
  ]
```

--------------------------------

### Basic Rust Coordinate Transformation

Source: https://github.com/3liz/proj4rs/blob/main/README.md

Demonstrates how to define source and target coordinate systems using proj strings and perform a point transformation in Rust. Note that the output for WGS84 is in radians and requires conversion to degrees.

```rust
use proj4rs;
use proj4rs::proj::Proj;

// EPSG:5174 - Example
let from = Proj::from_proj_string(concat!(
    "+proj=tmerc +lat_0=38 +lon_0=127.002890277778",
    " +k=1 +x_0=200000 +y_0=500000 +ellps=bessel",
    " +towgs84=-145.907,505.034,685.756,-1.162,2.347,1.592,6.342",
    " +units=m +no_defs +type=crs"
))
.unwrap();

// EPSG:4326 - WGS84, known to us as basic longitude and latitude.
let to = Proj::from_proj_string(concat!(
    "+proj=longlat +ellps=WGS84",
    " +datum=WGS84 +no_defs"
))
.unwrap();

let mut point_3d = (198236.3200000003, 453407.8560000006, 0.0);
proj4rs::transform::transform(&from, &to, &mut point_3d).unwrap();

// Note that WGS84 output from this library is in radians, not degrees.
point_3d.0 = point_3d.0.to_degrees();
point_3d.1 = point_3d.1.to_degrees();

// Output in longitude, latitude, and height.
println!("{} {}",point_3d.0, point_3d.1); // 126.98069676435814, 37.58308534678718

```

--------------------------------

### Build WASM Package for Web

Source: https://github.com/3liz/proj4rs/blob/main/proj4rs/README_WASM.md

Compiles the proj4rs library for the web target using wasm-pack. Use the --no-default-features flag to exclude default features.

```bash
wasm-pack build --target web --no-default-features
```

--------------------------------

### Build npm Bundle Package with Cargo-Make

Source: https://github.com/3liz/proj4rs/blob/main/proj4rs/README_WASM.md

Creates an npm-compatible bundle package for proj4rs using cargo-make. This is typically used for publishing to npm.

```bash
cargo make wasm_bundle
```

--------------------------------

### Build WASM Package with Cargo-Make

Source: https://github.com/3liz/proj4rs/blob/main/proj4rs/README_WASM.md

Builds the WASM package using the cargo-make tool. This command simplifies the build process for WASM targets.

```bash
cargo make wasm
```

--------------------------------

### Proj4js Supported Projections

Source: https://github.com/3liz/proj4rs/blob/main/projections.md

This list indicates projections available in the proj4js library. '+' denotes supported projections, while '-' denotes unsupported ones.

```text
- [+] aea
- [+] aeqd
- [-] bonne
- [-] cass
- [+] cea
- [+] eqc
- [-] eqdc
- [-] eqearth
- [-] equi
- [+] etmerc
- [-] gauss
- [+] geocent
- [+] geos
- [-] gnom
- [-] gstmerc
- [+] krovac
- [+] laea
- [+] lcc
- [+] longlat
- [+] merc
- [+] mill
- [+] moll
- [-] nzmg
- [-] omerc
- [-] ortho
- [-] poly
- [-] qsc
- [-] robin
- [-] sinu
- [+] somerc
- [+] stere
- [+] sterea
- [+] tmerc
- [-] tpers
- [+] utm
- [-] vandg
```

--------------------------------

### JavaScript Coordinate Transformation with Proj4rs WASM

Source: https://github.com/3liz/proj4rs/blob/main/README.md

Shows how to use the JavaScript API exposed by proj4rs when compiled for WASM, mimicking the proj4js library for in-browser coordinate transformations.

```javascript
let from = new Proj.Projection("+proj=latlong +ellps=GRS80");
let to = new Proj.Projection("+proj=etmerc +ellps=GRS80");
let point = new Proj.Point(2.0, 1.0, 0.0);

// Point is transformed in place
Proj.transform(from, to, point);

```

--------------------------------

### Proj4rs Supported Projections

Source: https://github.com/3liz/proj4rs/blob/main/projections.md

This list shows projections directly defined and supported within the proj4rs library. It groups related projections together.

```text
[
    (latlong, longlat),
    (lcc),
    (etmerc, utm),
    (tmerc),
    (aea, leac),
    (stere, ups),
    (sterea),
    (merc, webmerc),
    (geocent, cart),
    (somerc),
    (laea),
    (moll, wag4, wag5),
    (geos),
    (eqc),
    (aeqd),
    (krovak),
    (mill),
    (cea),
]
```

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