/*!

# Plotters - Rust Drawing Library for Visualization  🦀 📈🚀

<a href="https://crates.io/crates/plotters">
    <img style="display: inline!important" src="https://img.shields.io/crates/v/plotters.svg"></img>
</a>

<a href="https://docs.rs/plotters">
    <img style="display: inline!important" src="https://docs.rs/plotters/badge.svg"></img>
</a>

<a href="https://plumberserver.com/plotters-docs/plotters">
    <img style="display: inline! important" src="https://img.shields.io/badge/docs-development-lightgrey.svg"></img>
</a>

*Please note: This library is in a very early stage. I am trying my best to stabilize the APIs and improving the overall quality. APIs may change at this time.*

Plotters is drawing library designed for rendering figures, plots, and charts, in pure rust. Plotters supports various types of backends, including bitmap, vector graph and WebAssembly.

## Gallery

<div class="galleryItem">
    <a href="https://raw.githubusercontent.com/38/plotters/master/examples/outputs/sample.png">
        <img src="https://raw.githubusercontent.com/38/plotters/master/examples/outputs/sample.png" class="galleryItem"></img>
    </a>
    <div class="galleryText">
        Multiple Plot
        <a href="https://github.com/38/plotters/blob/master/examples/chart.rs">[code]</a>
    </div>
</div>

<div class="galleryItem">
    <a href="https://raw.githubusercontent.com/38/plotters/master/examples/outputs/stock.png">
        <img src="https://raw.githubusercontent.com/38/plotters/master/examples/outputs/stock.png" class="galleryItem"></img>
    </a>
    <div class="galleryText">
        Candlestick Plot
        <a href="https://github.com/38/plotters/blob/master/examples/stock.rs">[code]</a>
    </div>
</div>

<div class="galleryItem">
    <a href="https://raw.githubusercontent.com/38/plotters/master/examples/outputs/histogram.png">
        <img src="https://raw.githubusercontent.com/38/plotters/master/examples/outputs/histogram.png" class="galleryItem"></img>
    </a>
    <div class="galleryText">
       Histogram
        <a href="https://github.com/38/plotters/blob/master/examples/histogram.rs">[code]</a>
    </div>
</div>

<div class="galleryItem">
    <a href="https://raw.githubusercontent.com/38/plotters/master/examples/outputs/0.png">
        <img src="https://raw.githubusercontent.com/38/plotters/master/examples/outputs/0.png" class="galleryItem"></img>
    </a>
    <div class="galleryText">
        Simple Chart
    </div>
</div>

<div class="galleryItem">
    <a href="https://raw.githubusercontent.com/38/plotters/master/examples/outputs/mandelbrot.png">
        <img src="https://raw.githubusercontent.com/38/plotters/master/examples/outputs/mandelbrot.png" class="galleryItem"></img>
    </a>
    <div class="galleryText">
        Mandelbrot set
        <a href="https://github.com/38/plotters/blob/master/examples/mandelbrot.rs">[code]</a>
    </div>
</div>

## Quick Start

To use Plotters, you can simply add Plotters into your `Cargo.toml`
```toml
[depedencies]
plotters = "^0.1.13"
```

And the following code draws a quadratic function. `src/main.rs`,

```rust
use plotters::prelude::*;
fn main() -> Result<(), Box<dyn std::error::Error>> {
    let root = BitMapBackend::new("examples/outputs/0.png", (640, 480)).into_drawing_area();
    root.fill(&White)?;
    let mut chart = ChartBuilder::on(&root)
        .caption("y=x^2", &("Arial", 50).into_font())
        .margin(5)
        .x_label_area_size(30)
        .y_label_area_size(30)
        .build_ranged(-1f32..1f32, -0.1f32..1f32)?;

    chart.configure_mesh().draw()?;

    chart.draw_series(LineSeries::new(
        (-50..=50).map(|x| x as f32 / 50.0).map(|x| (x, x * x)),
        &Red,
    ))?
        .label("y = x^2")
        .legend(|(x,y)| Path::new(vec![(x,y), (x + 20,y)], &Red));

    chart.configure_series_labels()
        .background_style(&White.mix(0.8))
        .border_style(&Black)
        .draw()?;

    Ok(())
}
```

![](https://raw.githubusercontent.com/38/plotters/master/examples/outputs/0.png)


## Motivation of Plotting in Rust

Rust is a perfect language for data visualization. Although there are many mature visualization libraries in many different languages.
But Rust is one of the best languages fits the need.

* **Easy to use** Rust has a very good iterator system built into the standard library. With the help of iterators,
Plotting in Rust can be as easy as most of the high-level programming languages. The Rust based plotting library
can be very easy to use.

* **Fast** If you need rendering a figure with trillions of data points,
Rust is a good choice. Rust's performance allows you to combine data processing step
and rendering step into a single application. When plotting in high-level programming languages,
e.g. Javascript or Python, data points must be downsampled before feeding into the plotting
program because of the performance considerations. Rust is fast enough to do the data processing and visualization
within a single program. You can also integrate the
figure rendering code into your application handling a huge amount of data and visualize it in real-time.

* **WebAssembly Support** Rust is one of few the language with the best WASM support. Plotting in Rust could be
very useful for visualization on a web page and would have a huge performance improvement comparing to Javascript.

## What types of figure are supported?

Plotters is not limited to any specific type of figure.
You can create your own types of figures easily with the Plotters API.

But Plotters provides some builtin figure types for convenience.
Currently, we support line series, point series, candlestick series, and histogram.
And the library is designed to be able to render multiple figure into a single image.
But Plotter is aimed to be a platform that is fully extendable to support any other types of figure.

## Plotting on HTML5 canvas

Plotters currently supports backend that uses the HTML5 canvas. To use the WASM support, you can simply use
`CanvasBackend` instead of other backend and all other API remains the same!

There's a small demo for Plotters + WASM under `examples/wasm-demo` directory of this repo.
To play with the deployed version, follow this [link](https://plumberserver.com/plotters-wasm-demo/index.html).

## Concepts by examples

### Drawing Backends
Plotters can use different drawing backends, including SVG, BitMap, and even real-time rendering. For example, a bitmap drawing backend.

```rust
use plotters::prelude::*;
fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Create a 800*600 bitmap and start drawing
    let mut backend = BitMapBackend::new("examples/outputs/1.png", (300, 200));
    // And if we want SVG backend
    // let backend = SVGBackend::new("output.svg", (800, 600));
    backend.draw_rect((50, 50), (200, 150), &Red, true)?;
    Ok(())
}
```

![](https://raw.githubusercontent.com/38/plotters/master/examples/outputs/1.png)

### Drawing Area
Plotters uses a concept called drawing area for layout purpose.
Plotters support multiple integrating into a single image.
This is done by creating sub-drawing-areas.

Besides that, the drawing area also allows the customized coordinate system, by doing so, the coordinate mapping is done by the drawing area automatically.

```rust
use plotters::prelude::*;
fn main() -> Result<(), Box<dyn std::error::Error>> {
    let root_drawing_area =
        BitMapBackend::new("examples/outputs/2.png", (300, 200)).into_drawing_area();
    // And we can split the drawing area into 3x3 grid
    let child_drawing_areas = root_drawing_area.split_evenly((3, 3));
    // Then we fill the drawing area with different color
    for (area, color) in child_drawing_areas.into_iter().zip(0..) {
        area.fill(&Palette99::pick(color))?;
    }
    Ok(())
}
```

![](https://raw.githubusercontent.com/38/plotters/master/examples/outputs/2.png)

### Elements

In Plotters, elements are build blocks of figures. All elements are able to draw on a drawing area.
There are different types of built-in elements, like lines, texts, circles, etc.
You can also define your own element in the application code.

You may also combine existing elements to build a complex element.

To learn more about the element system, please read the [element module documentation](./element/index.html).

```rust
use plotters::prelude::*;
fn main() -> Result<(), Box<dyn std::error::Error>> {
    let root = BitMapBackend::new("examples/outputs/3.png", (300, 200)).into_drawing_area();
    root.fill(&White)?;
    // Draw an circle on the drawing area
    root.draw(&Circle::new(
        (100, 100),
        50,
        Into::<ShapeStyle>::into(&Green).filled(),
    ))?;
    Ok(())
}
```

![](https://raw.githubusercontent.com/38/plotters/master/examples/outputs/3.png)

### Composable Elements

Besides the built-in elements, elements can be composed into a logic group we called composed elements.
When composing new elements, the upper-left corner is given in the target coordinate, and a new pixel-based
coordinate which has the upper-left corner defined as `(0,0)` is used for further element composition purpose.

For example, we can have an element which includes a dot and its coordinate.

```rust
use plotters::prelude::*;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let root = BitMapBackend::new("examples/outputs/4.png", (640, 480)).into_drawing_area();

    root.fill(&RGBColor(240, 200, 200))?;

    let root = root.apply_coord_spec(RangedCoord::<RangedCoordf32, RangedCoordf32>::new(
        0f32..1f32,
        0f32..1f32,
        (0..640, 0..480),
    ));
    let font = ("Arial", 15.0).into_font();

    let dot_and_label = |x: f32, y: f32| {
        return EmptyElement::at((x, y))
            + Circle::new((0, 0), 3, ShapeStyle::from(&Black).filled())
            + Text::new(format!("({:.2},{:.2})", x, y), (10, 0), &font);
    };

    root.draw(&dot_and_label(0.5, 0.6))?;
    root.draw(&dot_and_label(0.25, 0.33))?;
    root.draw(&dot_and_label(0.8, 0.8))?;
    Ok(())
}
```

![](https://raw.githubusercontent.com/38/plotters/master/examples/outputs/4.png)

### Chart Context

In order to draw a chart, Plotters need a data object built on top of the drawing area called `ChartContext`.
The chart context defines even higher level constructs compare to the drawing area.
For example, you can define the label areas, meshes, and put a data series onto the drawing area with the help
of the chart context object.

```rust
use plotters::prelude::*;
fn main() -> Result<(), Box<dyn std::error::Error>> {
    let root = BitMapBackend::new("examples/outputs/5.png", (640, 480)).into_drawing_area();
    root.fill(&White);
    let root = root.margin(10, 10, 10, 10);
    // After this point, we should be able to draw construct a chart context
    let font: FontDesc = ("Arial", 40.0).into();
    // Create the chart object
    let mut chart = ChartBuilder::on(&root)
        // Set the caption of the chart
        .caption("This is our first plot", &font)
        // Set the size of the label region
        .x_label_area_size(20)
        .y_label_area_size(40)
        // Finally attach a coordinate on the drawing area and make a chart context
        .build_ranged(0f32..10f32, 0f32..10f32)?;

    // Then we can draw a mesh
    chart
        .configure_mesh()
        // We can customize the maximum number of labels allowed for each axis
        .x_labels(5)
        .y_labels(5)
        // We can also change the format of the label text
        .y_label_formatter(&|x| format!("{:.3}", x))
        .draw()?;

    // And we can draw something in the drawing area
    let smaller_font = font.resize(10.0);
    chart.draw_series(LineSeries::new(
        vec![(0.0, 0.0), (5.0, 5.0), (8.0, 7.0)],
        &Red,
    ))?;
    // Similarly, we can draw point series
    chart.draw_series(PointSeries::of_element(
        vec![(0.0, 0.0), (5.0, 5.0), (8.0, 7.0)],
        5,
        &Red,
        &|c, s, st| {
            return EmptyElement::at(c)    // We want to construct a composed element on-the-fly
            + Circle::new((0,0),s,st.filled()) // At this point, the new pixel coordinate is established
            + Text::new(format!("{:?}", c), (10, 0), &smaller_font);
        },
    ))?;
    Ok(())
}
```

![](https://raw.githubusercontent.com/38/plotters/master/examples/outputs/5.png)

## Misc

To use the latest development version, pull https://github.com/38/plotters.git. In `Cargo.toml`

```toml
[dependencies]
plotters = { git = "https://github.com/38/plotters.git" }
```

Plotters now supports use features to control the backend dependencies. By default, `BitMapBackend` and `SVGBackend` are supported,
use `default_features = false` in the dependency description in `Cargo.toml` and you can cherrypick the backend implementations.

- `svg` Enable the `SVGBackend`
- `bitmap` Enable the `BitMapBackend`

For example, the following dependency description would avoid compiling with bitmap support:

```toml
[dependencies]
plotters = { git = "https://github.com/38/plotters.git", default_features = false, features = ["svg"] }
```


<style>
    img {
            display: block;
            margin: 0 auto;
            max-width: 500px;
    }
    .galleryItem {
            width: 250px;
            display: inline-block;
    }
    .galleryImg {
            max-width: 100%;
    }
    .galleryText {
            text-align: center;
    }
</style>

*/
pub mod chart;
pub mod coord;
pub mod data;
pub mod drawing;
pub mod element;
pub mod series;
pub mod style;

#[cfg(test)]
pub use crate::drawing::create_mocked_drawing_area;

/// The module imports the most commonly used types and modules in Plotters
pub mod prelude {
    pub use crate::chart::{ChartBuilder, ChartContext};
    pub use crate::coord::{
        CoordTranslate, LogCoord, LogRange, LogScalable, Ranged, RangedCoord, RangedCoordf32,
        RangedCoordf64, RangedCoordi32, RangedCoordi64, RangedCoordu32, RangedCoordu64,
    };

    #[cfg(feature = "chrono")]
    pub use crate::coord::{RangedDate, RangedDateTime};

    pub use crate::drawing::*;
    pub use crate::series::{Histogram, LineSeries, PointSeries};
    pub use crate::style::{
        Black, Blue, Color, Cyan, FontDesc, FontTransform, Green, HSLColor, IntoFont, Magenta,
        Mixable, Palette, Palette100, Palette99, Palette9999, PaletteColor, RGBColor, Red,
        ShapeStyle, SimpleColor, TextStyle, Transparent, White, Yellow,
    };

    pub use crate::element::{
        CandleStick, Circle, Cross, DynElement, EmptyElement, IntoDynElement, MultiLineText, Path,
        Pixel, Rectangle, Text,
    };

    #[allow(type_alias_bounds)]
    /// The type used to returns a drawing operation that can be failed
    /// - `T`: The return type
    /// - `D`: The drawing backend type
    pub type DrawResult<T, D: DrawingBackend> =
        Result<T, crate::drawing::DrawingAreaErrorKind<D::ErrorType>>;
}