plt 0.4.0

Plotting library with a focus on publication level aesthetics and ergonomic control.
Documentation 
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# plt

[![CI](https://github.com/plt-rs/plt/actions/workflows/ci.yml/badge.svg)](https://github.com/plt-rs/plt/actions/workflows/ci.yml)
[![Crates.io](https://img.shields.io/crates/v/plt)](https://crates.io/crates/plt)
[![docs.rs](https://img.shields.io/docsrs/plt)](https://docs.rs/plt)
[![dependency status](https://deps.rs/crate/plt/0.3.1/status.svg)](https://deps.rs/crate/plt/0.3.1)

A plotting library with a focus on publication level aesthetics and ergonomic control.

## Structure
- Plots are drawn on a `Subplot`.
- One or more subplots are organized in a `Layout`.
- The layout is added to a `Figure`, which is used to draw to a file or directly to a `Backend`.

## Use

To get started, see the [examples](https://github.com/plt-rs/plt/tree/main/plt/examples) directory in the main repository.

### Example
```rust
use plt::*;

// create data
let xs: Vec<f64> = (0..=100).map(|n: u32| n as f64 * 0.1).collect();
let ys: Vec<f64> = xs.iter().map(|x| x.powi(3)).collect();

// create subplot
let mut sp = Subplot::builder()
    .label(Axes::X, "x data")
    .label(Axes::Y, "y data")
    .build();

// plot data
sp.plot(&xs, &ys).unwrap();

// make figure and add subplot
let mut fig = <Figure>::default();
fig.set_layout(SingleLayout::new(sp)).unwrap();

// save figure to file
fig.draw_file(FileFormat::Png, "example.png").unwrap();
```

![Simple Example](https://github.com/plt-rs/plt/blob/main/plt/examples/assets/simple.png?raw=true)

## Dependencies

Currently, the only implemented backend depends on [Cairo](https://www.cairographics.org).

### Debian / Ubuntu
`apt install libcairo2-dev`

### Arch
`pacman -Syu cairo`