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