Featuresprovided by Oviz

Expressive language

Component {
  width = 50
  height = 100%-20
  on:click = handler
  Rect.full {
    fill = "#ffa"
Instead of constructing the graph by lines of code, Oviz allows you to describe the structure via its visualization language. It is designed for users with different technical backgrounds, without requiring knowledge on any specific programming language.

Intuitive grammar

The syntax is simple, flexible and easy to learn. Read the tutorial to get started.

Compiler included

Oviz ships with a compiler that can run in the browser environment. No Webpack or other preprocessors are needed.

Editor support

A VSCode plugin is provided with support for syntax highlighting, auto completion, snippets, and other features.

Layout system

Oviz provides an auto-layout system that works for both SVG and Canvas, therefore you no longer need to maintain logic for calculating sizes and positions for graphical elements.


Components are positioned based on their anchors and relative sizes.

Coordinate systems

Components can have scaling systems or use polor coordinate systems.

Layout components

High-level layout components such as ColumnsRows, and Box are provided.

Component-based framework

The core concept of Oviz is creating and reusing components. It is dead simple to write a new component that encapsulates graphical elements, data processing logic, and behaviors. Then it can be used anywhere in your template or even shared across projects.

Sockets and delegates

These two powerful features make custom components incredibly flexible and extensible. Read the docs for more information.

The lifetime and hooks

The lifetime of an Oviz component is clearly defined. Users can add hooks at any point to customize the behavior of a component.

Interactive visualization

Oviz is designed for interactive data visualization. Simple interactions such as mouseover effects and tooltips can be achieved in the template without incorporating any code; you can also write event listeners to meet advanced requirements.

States and stages

States and stages provided a simple solution to the internal mutability of components.


Complicated interactions can be abstracted into behaviors and applied to other components.


You won't be baffled by colors and themes in Oviz. The built-in theming system supports extendable themes with support for named colors, color manipulation, color schemes, and more advanced features. Two carefully crafted default themes are provided.
Theme light
Theme dark

Built-in chart library

Although not designed to be a plotting library, Oviz handles plots and charts drawing excellently from simple bar charts to complicated ones such as the pyramid heatmap. Visit our dedicated charts demo site at chart.oviz.org for more examples.

Uniform extension API

Almost every part of Oviz is available for extension via a collection of API that conforms to a consistent style.You can even write a custom renderer to prevent it from outputting SVGs or Canvas images, and instead use the raw laid-out element tree to fit your particular needs.


Oviz has been used in multipe published systems, including Oviz-Bio, an integrated platform for bioinformatics data visualization. The following thumbnails show some figures available in Oviz-Bio: