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# Kaleidoscope-Heatmap
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![status][st:experimental] [![Build Status][travis:image]][travis:status]
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[travis:image]: https://travis-ci.org/keyboardio/Kaleidoscope-Heatmap.svg?branch=master
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[travis:status]: https://travis-ci.org/keyboardio/Kaleidoscope-Heatmap
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[st:stable]: https://img.shields.io/badge/stable-✔-black.svg?style=flat&colorA=44cc11&colorB=494e52
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[st:broken]: https://img.shields.io/badge/broken-X-black.svg?style=flat&colorA=e05d44&colorB=494e52
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[st:experimental]: https://img.shields.io/badge/experimental----black.svg?style=flat&colorA=dfb317&colorB=494e52
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The `Heatmap` plugin provides a LED effect, that displays a heatmap on the
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keyboard. The LEDs under each key will have a color according to how much use
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they see. Fewer used keys will have deep blue colors, that gradually turns
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lighter, then green, to yellow, and finally red for the most used keys. The
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heatmap is not updated on every key press, but periodically. It's precision is
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also an approximation, and not a hundred percent exact. Nevertheless, it is a
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reasonable estimate.
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## Using the plugin
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The plugin comes with reasonable defaults pre-configured, all one needs to do is
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include the header, and make sure the plugin is in use:
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```c++
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#include <Kaleidoscope.h>
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#include <Kaleidoscope-Heatmap.h>
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void setup() {
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USE_PLUGINS(&HeatmapEffect);
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Kaleidoscope.setup ();
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}
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```
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This sets up the heatmap to update every 500 cycles, which is about 2.5 seconds,
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and is the default. It also registers a new LED effect, which means that if you
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have not set up any other effects, then Heatmap will likely be the default. You
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may not want that, so setting up at least one other LED effect, such as `LEDOff`
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is highly recommended.
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## Plugin methods
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The plugin provides a `HeatmapEffect` object, which has the following methods
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and properties:
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### `.activate()`
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> When called, immediately activates the Heatmap effect. Mostly useful in the
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> `setup()` method of the Sketch, or in macros that are meant to switch to the
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> heatmap effect, no matter where we are in the list.
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### `.update_delay`
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> The number of milliseconds to wait between updating the heatmap. Updating the
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> heatmap incurs a significant performance penalty, and should not be done too
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> often. Doing it too rarely, on the other hand, make it much less useful. One
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> has to strike a reasonable balance.
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>
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> Defaults to *500*.
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## Dependencies
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* [Kaleidoscope-LEDControl](https://github.com/keyboardio/Kaleidoscope-LEDControl)
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## Further reading
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Starting from the [example][plugin:example] is the recommended way of getting
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started with the plugin.
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[plugin:example]: https://github.com/keyboardio/Kaleidoscope-Heatmap/blob/master/examples/Heatmap/Heatmap.ino
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