qmk_firmware/quantum/led_matrix/animations/solid_reactive_nexus.h

#ifdef LED_MATRIX_KEYREACTIVE_ENABLED
#    if defined(ENABLE_LED_MATRIX_SOLID_REACTIVE_NEXUS) || defined(ENABLE_LED_MATRIX_SOLID_REACTIVE_MULTINEXUS)

#        ifdef ENABLE_LED_MATRIX_SOLID_REACTIVE_NEXUS
LED_MATRIX_EFFECT(SOLID_REACTIVE_NEXUS)
#        endif

#        ifdef ENABLE_LED_MATRIX_SOLID_REACTIVE_MULTINEXUS
LED_MATRIX_EFFECT(SOLID_REACTIVE_MULTINEXUS)
#        endif

#        ifdef LED_MATRIX_CUSTOM_EFFECT_IMPLS

static uint8_t SOLID_REACTIVE_NEXUS_math(uint8_t val, int16_t dx, int16_t dy, uint8_t dist, uint16_t tick) {
    uint16_t effect = tick - dist;
    if (effect > 255) effect = 255;
    if (dist > 72) effect = 255;
    if ((dx > 8 || dx < -8) && (dy > 8 || dy < -8)) effect = 255;
    return qadd8(val, 255 - effect);
}

#            ifdef ENABLE_LED_MATRIX_SOLID_REACTIVE_NEXUS
bool SOLID_REACTIVE_NEXUS(effect_params_t* params) {
    return effect_runner_reactive_splash(qsub8(g_last_hit_tracker.count, 1), params, &SOLID_REACTIVE_NEXUS_math);
}
#            endif

#            ifdef ENABLE_LED_MATRIX_SOLID_REACTIVE_MULTINEXUS
bool SOLID_REACTIVE_MULTINEXUS(effect_params_t* params) {
    return effect_runner_reactive_splash(0, params, &SOLID_REACTIVE_NEXUS_math);
}
#            endif

#        endif // LED_MATRIX_CUSTOM_EFFECT_IMPLS
#    endif     // defined(ENABLE_LED_MATRIX_SOLID_REACTIVE_NEXUS) || defined(ENABLE_LED_MATRIX_SOLID_REACTIVE_MULTINEXUS)
#endif         // LED_MATRIX_KEYREACTIVE_ENABLED