qmk-firmware/quantum/rgb_matrix_runners/effect_runner_dx_dy.h

#pragma once

typedef HSV (*dx_dy_f)(HSV hsv, int16_t dx, int16_t dy, uint8_t time);

bool effect_runner_dx_dy(effect_params_t* params, dx_dy_f effect_func) {
    RGB_MATRIX_USE_LIMITS(led_min, led_max);

    uint8_t time = scale16by8(g_rgb_timer, rgb_matrix_config.speed / 2);
    for (uint8_t i = led_min; i < led_max; i++) {
        RGB_MATRIX_TEST_LED_FLAGS();
        int16_t dx  = g_led_config.point[i].x - k_rgb_matrix_center.x;
        int16_t dy  = g_led_config.point[i].y - k_rgb_matrix_center.y;
        RGB     rgb = hsv_to_rgb(effect_func(rgb_matrix_config.hsv, dx, dy, time));
        rgb_matrix_set_color(i, rgb.r, rgb.g, rgb.b);
    }
    return led_max < DRIVER_LED_TOTAL;
}