RedwoodAdmin/RedwoodFramework — pull request #38 by marmphco (2014-08-14 20:44:58+00:00)
Title: Switched d3rw.js heatmap to canvas backing

The grid of 's previously used to render a heatmap has been replaced with a single whose data is taken from a hidden canvas.

So the rendering flow is something like this: grid data => hidden canvas => inline PNG data => SVG image.

This change causes noticeable improvements to heatmap rendering speed and hover smoothness, particularly in the Continuous Markets experiment. The output is identical.