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# Colormap
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The `Colormap` extension provides an easier way to set up a different - static -
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color map per-layer. This means that we can set up a map of colors for each key,
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on a per-layer basis, and whenever a layer becomes active, the color map for
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that layer is applied. Colors are picked from a 16-color palette, provided by
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the [LED-Palette-Theme][plugin:l-p-t] plugin. The color map is stored in
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`EEPROM`, and can be easily changed via the [FocusSerial][plugin:focusserial]
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plugin, which also provides palette editing capabilities.
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[plugin:focusserial]: Kaleidoscope-FocusSerial.md
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[plugin:l-p-t]: Kaleidoscope-LED-Palette-Theme.md
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## Using the extension
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To use the extension, include the header, tell it the number of layers you have,
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register the `Focus` hooks, and it will do the rest.
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```c++
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#include <Kaleidoscope.h>
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#include <Kaleidoscope-EEPROM-Settings.h>
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#include <Kaleidoscope-Colormap.h>
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#include <Kaleidoscope-FocusSerial.h>
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#include <Kaleidoscope-LED-Palette-Theme.h>
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KALEIDOSCOPE_INIT_PLUGINS(EEPROMSettings,
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LEDPaletteTheme,
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ColormapEffect,
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Focus);
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void setup(void) {
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Kaleidoscope.setup();
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ColormapEffect.max_layers(1);
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}
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```
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## Plugin methods
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The extension provides an `ColormapEffect` singleton object, with a single method:
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### `.max_layers(max)`
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> Tells the extension to reserve space in EEPROM for up to `max` layers. Can
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> only be called once, any subsequent call will be a no-op.
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## Focus commands
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### `colormap.map`
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> Without arguments, prints the color map: palette indexes for all layers.
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>
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> With arguments, updates the color map with new indexes. One does not need to
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> give the full map, the plugin will process as many arguments as available, and
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> ignore anything past the last key on the last layer (as set by the
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> `.max_layers()` method).
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## Dependencies
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* [Kaleidoscope-EEPROM-Settings](Kaleidoscope-EEPROM-Settings.md)
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* [Kaleidoscope-FocusSerial](Kaleidoscope-FocusSerial.md)
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* [Kaleidoscope-LED-Palette-Theme](Kaleidoscope-LED-Palette-Theme.md)
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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]: /examples/LEDs/Colormap/Colormap.ino
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