by Torstein Hønsi
A heat map is a graphical representation of data where the individual values contained in a matrix are represented as colors.
Heat maps require the modules/heatmap.js file to be loaded.
The heat map series is defined by setting the type to heatmap. A heat map has an X and Y axis like any cartesian series. The point definitions however, take three values, x, y as well as value, which serves as the value for color coding the point. These values can also be given as an array of three numbers.
Heat maps borrow a central concept from Highmaps, the color axis. See the docs article on color axis for details
See the featured demos at Heat map and Large heatmap. The latter demonstrates how a HTML5 canvas can be plugged in to optimize rendering times.
See heatmap in the Highmaps docs.