VEGA

Data

inline

url (json, csv, tsv, dsv, topoJSON)

programmatically

Transform

Functions to transform data to compute graphical representation

• Basic (sorting, filtering, max/min, aggregation, packing, custom)
• Geographic
• Layout (pie, stack, force, voronoi, world cloud)
• Hierarchy (tree, treemap, partition)
• Cross filtering

Scales

Bijective functions

Use to map data with visual values

• Quantitative (linear, pow, sqrt, log)
• Discrete (ordinal, band, point)
• Discretizing (quantile, quantize, threshold)

Marks

What you draw

All is path. Is basically svg markup

• rect
• symbol
• line/trail
• arc/area
• path
• text
• shape (for maps)
• area
• image

Chart elements

• Axes
• Legends

Signals

It's variables you can use anywhere

• Predefine signals: width / height
• Expression evaluation
• Event handling

Pro / Const

Pro

+ All in one structured file

+ Online live editor

+ Nearly no dataviz limit

+ Good documentation

+ Active development

Const

- spec in json

- No reusable code across spec

- No predefined design

- Transform function naming not straightforward
(collect to sort)

- Uncomplete autocompletion of online editor

- Uncomplete documentation (custom styling, unknown properties)

- hard to size with css (responsive)