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90 lines
2.7 KiB
90 lines
2.7 KiB
# Heatmap
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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-LEDControl.h>
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#include <Kaleidoscope-Heatmap.h>
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static const cRGB heat_colors[] PROGMEM = {
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{ 0, 0, 0}, // black
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{255, 25, 25}, // blue
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{ 25, 255, 25}, // green
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{ 25, 25, 255} // red
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};
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KALEIDOSCOPE_INIT_PLUGINS(LEDControl, HeatmapEffect);
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void setup() {
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Kaleidoscope.setup ();
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HeatmapEffect.heat_colors = heat_colors;
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HeatmapEffect.heat_colors_length = 4;
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}
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```
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This sets up the heatmap to update every second (by default). It also registers
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a new LED effect, which means that if you have not set up any other effects,
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then Heatmap will likely be the default. You may not want that, so setting up
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at least one other LED effect, such as `LEDOff` 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 *1000*.
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### `.heat_colors`
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> A cRGB array describing the gradian of colors that will be used, from colder
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> to hoter keys.
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> E.g. with `heat_colors = {{100, 0, 0}, {0, 100, 0}, {0, 0, 100}}`, a key
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> with a temperature of 0.8 (0=coldest, 1=hotest), will end up with a color
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> `{0, 40, 60}`.
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>
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> Defaults to `{{0, 0, 0}, {25, 255, 25}, {25, 255, 255}, {25, 25, 255}}`
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> (black, green, yellow, red)
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### `.heat_colors_length`
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> Length of the `heat_colors` array.
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>
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> Defaults to *4*
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## Dependencies
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* [Kaleidoscope-LEDControl](LEDControl.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/Heatmap/Heatmap.ino
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