Vega is an incredible way to create visualizations, stated in their own words:
Vega is a visualization grammar, a declarative language for creating, saving, and sharing interactive visualization designs. With Vega, you can describe the visual appearance and interactive behavior of a visualization in a JSON format, and generate web-based views using Canvas or SVG.
More complex Vega visuals in Looker: https://github.com/groodlooker/vega
This Looker version adds a number of ui elements to craft visualizations in Vega-Lite, a higher-level language built on top of Vega:
https://vega.github.io/vega-lite/
NEW as of 07/08/2020 a bundled version - simply drop in the "Main" section. No more dependencies needed. https://storage.googleapis.com/custom-visualizations/bundle.js
Dependencies that need to be added to your Looker Custom Viz are hosted here.
Use these dependencies for Vega 3.2
https://cdn.jsdelivr.net/npm/vega@5.4.0
https://cdn.jsdelivr.net/npm/vega-lite@3.4.0
https://cdn.jsdelivr.net/npm/vega-embed@4.2.1
If using older versions of vega and having issues, try these dependencies
(Newer versions of Vega-lite for Looker may not work without updating to the newest Vega dependencies)
https://cdn.jsdelivr.net/npm/vega@5.0.0-rc2
https://cdn.jsdelivr.net/npm/vega-lite@3.0.0-rc13
https://cdn.jsdelivr.net/npm/vega-embed@3.29.1
Versions:
Vega-lite for Looker 3.2 with Legend & Size Control: https://grood-lookin.s3.us-east-2.amazonaws.com/vega-3-2.js
Vega-lite for Looker 3.1 with sort & label fixes: https://s3.us-east-2.amazonaws.com/grood-lookin/vega-3-1.js
Vega-lite for Looker 3.0 https://s3.us-east-2.amazonaws.com/grood-lookin/vega-3.js
Vega-lite for Looker 1.0 https://s3.us-east-2.amazonaws.com/grood-lookin/vega.js
Vega-lite for Looker 2.0: https://s3.us-east-2.amazonaws.com/grood-lookin/vega-2.js
All charts you create will maintain their drill paths with additional info about which field is generating the drill link.
A few examples of what you can create with Vega-Lite for Looker:
Move Legend in 3.2 (& two Looker color Palettes)
Labels available in 3.0
Label can be pinned to the field value or to zero:
Apply filters/conditions to labels:
New as of 12/22/18 box plot support
Multi-layer support availabe in 2.0
Value vs Target charting:
Lollipop style charts:
Reference Lines that update on selection:
Functionality in original vega-lite
Bar trellising:
Multi-facet trellising:
Bubble Plots:
Heatmap:
Scatter Plots:
Highlighting:
Vega-Lite enables even richer visualization than this current version of "Vega-Lite for Looker" will allow for. Future iterations of this will include layers or "dual axis" support, cross-highlighting capabilities, more formatting options (line thickness, fonts, etc) and possibly crossfiltering.