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qmk_firmware/quantum/rgb_matrix_animations/rainbow_beacon_anim.h

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#ifndef DISABLE_RGB_MATRIX_RAINBOW_BEACON
RGB_MATRIX_EFFECT(RAINBOW_BEACON)
# ifdef RGB_MATRIX_CUSTOM_EFFECT_IMPLS
static HSV RAINBOW_BEACON_math(HSV hsv, int8_t sin, int8_t cos, uint8_t i, uint8_t time) {
hsv.h += ((g_led_config.point[i].y - k_rgb_matrix_center.y) * 2 * cos + (g_led_config.point[i].x - k_rgb_matrix_center.x) * 2 * sin) / 128;
return hsv;
}
bool RAINBOW_BEACON(effect_params_t* params) { return effect_runner_sin_cos_i(params, &RAINBOW_BEACON_math); }
# endif // RGB_MATRIX_CUSTOM_EFFECT_IMPLS
#endif // DISABLE_RGB_MATRIX_RAINBOW_BEACON