https://github.com/dustin/go-heatmap

Heatmap creation stuff for go.
https://github.com/dustin/go-heatmap

Last synced: about 2 months ago
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Heatmap creation stuff for go.

• Host: GitHub
• URL: https://github.com/dustin/go-heatmap
• Owner: dustin
• License: other
• Created: 2012-02-12T11:12:57.000Z (almost 13 years ago)
• Default Branch: master
• Last Pushed: 2019-11-17T15:46:44.000Z (about 5 years ago)
• Last Synced: 2024-10-11T14:15:22.854Z (2 months ago)
• Language: Go
• Homepage:
• Size: 74.2 KB
• Stars: 111
• Watchers: 6
• Forks: 16
• Open Issues: 3
• Metadata Files:
  • Readme: README.markdown
  • License: LICENSE

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README

        
# Heatmaps

This is a toolkit for creating [heatmaps][heatmap].  Heatmaps are

awesome.  I use them for a few things, and now you can, too.

There are quite a few things you can do here and they don't all have

the high level documentation they deserve currently.  You can start by

looking at the [example][example] to get a feel for what you can do.

Basically, feed in a bunch of `x,y` type data and get back a heatmap.

Awesome.

Here's an example from a real-live report:

![Northeast US](https://raw.github.com/wiki/dustin/go-heatmap/ne-us.jpg)

## Colors

Colors are always the hardest part, so I attempted to make it easy by

providing three things:

### Predefined Color Schemes

[gheat][gheat] has a set of colors that are available by default under

the `schemes` subpackage.  You can preview them in

[their documentation][ghschemes] and use them directly.

### Drawing Color Schemes

The `schemes` subpackage also has a tool for generating a color scheme

from an image.  Given an image that looks like this:

![Alpha Fire Scheme](https://raw.github.com/dustin/go-heatmap/master/schemes/alphafire.png)

You can use `schemes.FromImage("/path/to/file")` to load it and use it

directly.  Colors near the bottom are for sparsely populated areas and

colors near the top are for areas that are densely populated.

### Computing Color Schemes

You can also compute a color scheme from spec using `schemes.Build`.

This lets you specify starting and ending colors across multiple

segments.  Fun away!

[heatmap]: http://en.wikipedia.org/wiki/Heat_map

[example]: examples/example/example.go

[gheat]: http://www.zetadev.com/software/gheat/0.2/__/doc/html/configuration.html

[ghschemes]: http://www.zetadev.com/software/gheat/0.2/__/doc/html/configuration.html#SECTION003200000000000000000