Programming language: Kotlin
License: GNU General Public License v3.0 or later
Tags: Science    
Latest version: v3.1.1

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Lets-Plot for Kotlin official JetBrains project

Latest Lets-Plot Kotlin API Version Latest Lets-Plot Version License


Lets-Plot for Kotlin is a Kotlin API for the Lets-Plot library - an open-source plotting library for statistical data.

Lets-Plot Kotlin API is built on the principles of layered graphics first described in the Leland Wilkinson work The Grammar of Graphics and later implemented in the ggplot2 package for R.

This grammar [...] is made up of a set of independent components that can be composed in many different ways. This makes [it] very powerful because you are not limited to a set of pre-specified graphics, but you can create new graphics that are precisely tailored for your problem.

Read Lets-Plot Usage Guide for quick introduction to the Grammar of Graphics and Lets-Plot Kotlin API.

Lets-Plot in Jupyter with Kotlin Kernel


In Jupyter notebook with a Kotlin Kernel, Lets-Plot library is available out-of-the-box. To install Kotlin Kernel and OpenJDK into a Conda environment, run the following command:

```shell script conda install kotlin-jupyter-kernel -c jetbrains

For more information about Jupyter Kotlin kernel, see the [Kotlin kernel for Jupyter/iPython](https://github.com/Kotlin/kotlin-jupyter) project.

<a id="line-magics"></a>
#### "Line Magics" 

You can include all the necessary Lets-Plot boilerplate code to a notebook using the following "line magic":

%use lets-plot

This will apply the lets-plot `library descriptor` bundled with the Kotlin Jupyter Kernel installed in your environment.

The `%useLatestDescriptors` line magic will force Kotlin Kernel to pull and apply the latest 
repository version of all `library descriptors`.

You can override lets-plot `library descriptor` settings using the lets-plot line magic parameters, like:

%use lets-plot(api=1.1.0, lib=1.5.4, js=1.5.4, isolatedFrame=false)

- `api` - version of Lets-Plot Kotlin API.
- `lib` - version of Lets-Plot library (JAR-s).
- `js`  - version of Lets-PLot JavaScript bundle.
- `isolatedFrame` - If `false`: load JS just once per notebook (default in Jupyter).
                    If `true`: include Lets-Plot JS in each output (default in [Datalore notebooks](#datalore))    

See: [Line Magics](https://github.com/Kotlin/kotlin-jupyter#line-magics) documentation in the Kotlin Jupyter project for more details.                    

<a id="start"></a>
#### Quickstart in Jupyter

- In [Jupyter](https://jupyter-notebook.readthedocs.io/en/stable/index.html), create a new notebook and choose the Kotlin kernel (see the [instructions](https://jupyter-notebook.readthedocs.io/en/stable/notebook.html?highlight=new#creating-a-new-notebook-document) for more details on how to select a kernel).

- Add the following code to a Jupyter notebook:

%use lets-plot

val rand = java.util.Random() val data = mapOf( "rating" to List(200) { rand.nextGaussian() } + List(200) { rand.nextGaussian() * 1.5 + 1.5 }, "cond" to List(200) { "A" } + List(200) { "B" } )

var p = lets_plot(data) p += geom_density(color="dark_green", alpha=.3) {x="rating"; fill="cond"} p + ggsize(500, 250)

- Execute the added code to evaluate the plotting capabilities of Lets-Plot.

<img src="https://raw.githubusercontent.com/JetBrains/lets-plot-kotlin/master/docs/examples/images/quickstart.png" alt="Couldn't load quickstart.png" width="500" height="270"/>
<a href="https://nbviewer.jupyter.org/github/JetBrains/lets-plot-kotlin/blob/master/docs/examples/jupyter-notebooks/quickstart.ipynb" 
   <img src="https://raw.githubusercontent.com/jupyter/design/master/logos/Badges/nbviewer_badge.png" 
        width="109" height="20">

<a id="jupyter-examples"></a>
#### Example of notebooks

Try the following [examples](https://github.com/JetBrains/lets-plot-kotlin/blob/master/docs/examples.md) to study features of the `Lets-Plot` library.

<a id="datalore"></a>
## Lets-Plot-Kotlin in Datalore notebooks

[Datalore](https://datalore.jetbrains.com/) is an online data science notebook by JetBrains.

In Datalore notebook you can run Kotlin code directly in your browser. Many popular Kotlin libraries are preinstalled and readily available
(see the list of [supported Kotlin libraries](https://github.com/Kotlin/kotlin-jupyter#supported-libraries)).

See [Quickstart in Datalore](https://view.datalore.io/notebook/Ybcyrh7ifkvTQVxbTMxaTp) example notebook to learn more
about Kotlin support in Datalore.

Watch the [Datalore Getting Started Tutorial](https://youtu.be/MjvFQxqNSe0) video for a quick introduction to Datalore.

<a id="jvm"></a>

## Lets-Plot in JVM and Kotlin/JS application

Apart from Jupyter notebooks, Lets-Plot library and Kotlin API enables embedding plots into a JVM and a Kotlin/JS

See [README_DEV.md](https://github.com/JetBrains/lets-plot-kotlin/blob/master/README_DEV.md) to learn more about
creating plots in JVM or Kotlin/JS environment.

In the [lets-plot-mini-apps](https://github.com/alshan/lets-plot-mini-apps) GitHub repository you will find examples of
using Lets-Plot Kotlin API in JVM and Kotlin/JS projects.

<a id="further_reading"></a>
## Further Reading

<a id="guide"></a>
#### User guide and API reference

- The User Guide in the form of Jupyter
  notebook: [user_guide.ipynb](https://nbviewer.jupyter.org/github/JetBrains/lets-plot-kotlin/blob/master/docs/guide/user_guide.ipynb).

- Lets-Plot Kotlin
  API [reference](https://lets-plot.org/kotlin/index.html).

<a id="tooltip-customization"></a>
#### Tooltip customization

You can customize the content, values formatting and appearance of tooltip for any geometry layer in your plot.

Learn more: [Tooltip Customization](https://github.com/JetBrains/lets-plot-kotlin/blob/master/docs/tooltips.md).

<a id="formatting"></a>
#### Formatting

Formatting of numeric and date-time values in tooltips, legends, on the axes and *text geometry* layer.

Learn more: [Formatting](https://github.com/JetBrains/lets-plot-kotlin/blob/master/docs/formats.md).

<a id="sampling"></a>
#### Data sampling 

Sampling is a special technique of data transformation, which helps to deal with large datasets and overplotting.

Learn more: [Data Sampling](https://github.com/JetBrains/lets-plot-kotlin/blob/master/docs/sampling.md). 

<a id="export"></a>
#### Saving plot to a file

The `ggsave()` function is a convenient way of saving a plot or a GGBunch object to a file.

The supported export formats are: `SVG, HTML, PNG, JPEG and TIFF`.

For example, the code below will save plot as a PNG image to the file `<user dir>//lets-plot-images/density.png`:

%use lets-plot

val rand = java.util.Random(123) val n = 400 val data = mapOf ( "rating" to List(n/2) { rand.nextGaussian() } + List(n/2) { rand.nextGaussian() * 1.5 + 1.5 }, "cond" to List(n/2) { "A" } + List(n/2) { "B" } )

var p = lets_plot(data) + geom_density { x = "rating"; color = "cond" } + ggsize(500, 250)

ggsave(p, "density.png")

<img src="https://raw.githubusercontent.com/JetBrains/lets-plot-kotlin/master/docs/examples/images/ggsave_demo.png" alt="Couldn't load ggsave_demo.png" width="500" height="250"/>

See `ggsave()` [documentation](https://htmlpreview.github.io/?https://raw.githubusercontent.com/JetBrains/lets-plot-kotlin/master/docs/api-reference/plot-api/jetbrains.letsPlot.export/ggsave.html)
for more information about the function arguments and default values.

<a id="geotools"></a>

#### GeoTools support

[GeoTools](https://www.geotools.org/) is an open source Java GIS Toolkit.

Lets-Plot supports visualization of a set of `SimpleFeature`-s stored in `SimpleFeatureCollection`, as well as
individual `Geometry` and `ReferencedEnvelope` objects.

Learn more: [GeoTools Support](https://github.com/JetBrains/lets-plot-kotlin/blob/master/docs/geotools.md).

<a id="new"></a>

## What is new in 3.1.0

- Added support for `coordFlip()`.

  See: [example notebook](https://nbviewer.jupyter.org/github/JetBrains/lets-plot-kotlin/blob/master/docs/examples/jupyter-notebooks/coord_flip.ipynb)

- Improved plot appearance and better `theme` support:

  - Bigger fonts across the board;
  - Gridlines;
  - 4 themes from ggplot2 (R) library: `themeGrey(), themeLight(), themeClassic(), themeMinimal()`;
  - Our designer theme: `themeMinimal2()` (used by default);
  - `themeNone()` for the case you want to design another theme;
  - A lot more parameters in the `theme()` function, also helpers: `elementLine()`, `elementRect()`, `elementText()`.

  See: [example notebook](https://nbviewer.jupyter.org/github/JetBrains/lets-plot-kotlin/blob/master/docs/examples/jupyter-notebooks/themes.ipynb)

> Note: fonts size, family and face still can not be configured.

- Improved Date-time formatting support:

  - tooltip format() should understand date-time format
    pattern [[#387](https://github.com/JetBrains/lets-plot/issues/387)];
  - scaleXDatetime should apply date-time formatting to the
    breaks [[#392](https://github.com/JetBrains/lets-plot/issues/392)].

  See `Out[7, 8, 10]` in
  the [example notebook](https://nbviewer.jupyter.org/github/JetBrains/lets-plot-kotlin/blob/master/docs/examples/jupyter-notebooks/formatting_axes_etc.ipynb)

- `CorrPlot()` function now also accepts pre-computed correlation coefficients.

- Kotlin/JS IR: `xxx.klib` artifacts are now available.

  See: [sample Kotlin/JS IR app](https://github.com/alshan/lets-plot-mini-apps/tree/main/js-ir-frontend-app)

- Other improvements and fixes -
  see [CHANGELOG.md](https://github.com/JetBrains/lets-plot-kotlin/blob/master/CHANGELOG.md#310---2021-11-05)
  for details.

<a id="change_log"></a>

## Change Log

See [CHANGELOG.md](https://github.com/JetBrains/lets-plot-kotlin/blob/master/CHANGELOG.md).

<a id="license"></a>
## License

Code and documentation released under the [MIT license](https://github.com/JetBrains/lets-plot-kotlin/blob/master/LICENSE).
Copyright © 2019-2021, JetBrains s.r.o.

*Note that all licence references and agreements mentioned in the lets-plot-kotlin README section above are relevant to that project's source code only.