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# Kaleidoscope-LED-Stalker
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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-LED-Stalker.svg?branch=master
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[travis:status]: https://travis-ci.org/keyboardio/Kaleidoscope-LED-Stalker
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[st:stable]: https://img.shields.io/badge/stable-✔-black.png?style=flat&colorA=44cc11&colorB=494e52
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[st:broken]: https://img.shields.io/badge/broken-X-black.png?style=flat&colorA=e05d44&colorB=494e52
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[st:experimental]: https://img.shields.io/badge/experimental----black.png?style=flat&colorA=dfb317&colorB=494e52
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The `StalkerEffect` plugin provides an interesting new typing experience: the
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LEDs light up as you tap keys, and play one of the selected effects: a haunting
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trail of ghostly white lights, or a blazing trail of fire.
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## Using the plugin
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To use the plugin, one needs to include the header, and select the effect.
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```c++
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#include <Kaleidoscope.h>
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#include <Kaleidoscope-LED-Stalker.h>
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void setup () {
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Kaleidoscope.setup ();
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StalkerEffect.configure (STALKER (Haunt, {0xff, 0, 0}));
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USE_PLUGINS (&StalkerEffect);
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StalkerEffect.activate ();
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}
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```
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It is recommended to place the activation of the plugin (the `Kaleidoscope.use`
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call) as early as possible, so the plugin can catch all relevant key presses.
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The configuration can happen at any time, but using the `STALKER` macro is
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highly recommended.
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## Plugin methods
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The plugin provides the `StalkerEffect` object, which has the following
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method:
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### `.configure(effect)`
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> Set the effect to use with the plugin. See below for a list.
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>
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> It is recommended to use the `STALKER` macro to declare the effect itself.
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### `.stepLength`
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> The length - in milliseconds - of each step of the animation. An animation
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> lasts 256 steps.
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>
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> Not a method itself, but a changeable value.
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>
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> Defaults to 50.
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## Plugin helpers
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### `STALKER(effect, params...)`
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> Returns an effect, to be used by the `.configure` method of the
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> `StalkerEffect` object. Any arguments given to the macro, are also passed on
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> to the effect. If the effect takes no arguments, use `NULL`.
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## Plugin effects
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The plugin provides the following effects:
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### `Haunt([color])`
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> A ghostly haunt effect, that trails the key taps with a ghostly white color
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> (or any other color, if specified).
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### `BlazingTrail()`
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> A blazing trail of fire will follow our fingers!
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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-LED-Stalker/blob/master/examples/LED-Stalker/LED-Stalker.ino
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