qmk-firmware/quantum/rgb_matrix_animations/raindrops_anim.h

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#pragma once
#ifndef DISABLE_RGB_MATRIX_RAINDROPS
#include "rgb_matrix_types.h"
extern rgb_counters_t g_rgb_counters;
extern rgb_config_t rgb_matrix_config;
static void raindrops_set_color(int i) {
HSV hsv = { 0 , rgb_matrix_config.sat, rgb_matrix_config.val };
// Take the shortest path between hues
int16_t deltaH = ((rgb_matrix_config.hue + 180) % 360 - rgb_matrix_config.hue) / 4;
if (deltaH > 127) {
deltaH -= 256;
} else if (deltaH < -127) {
deltaH += 256;
}
hsv.h = rgb_matrix_config.hue + (deltaH * (rand() & 0x03));
RGB rgb = hsv_to_rgb(hsv);
rgb_matrix_set_color(i, rgb.r, rgb.g, rgb.b);
}
bool rgb_matrix_raindrops(effect_params_t* params) {
if (!params->init) {
// Change one LED every tick, make sure speed is not 0
if (scale16by8(g_rgb_counters.tick, qadd8(rgb_matrix_config.speed, 16)) % 10 == 0) {
raindrops_set_color(rand() % DRIVER_LED_TOTAL);
}
return false;
}
RGB_MATRIX_USE_LIMITS(led_min, led_max);
for (int i = led_min; i < led_max; i++) {
raindrops_set_color(i);
}
return led_max < DRIVER_LED_TOTAL;
}
#endif // DISABLE_RGB_MATRIX_RAINDROPS