MPU9250 WS2812B bouncing ball

#include <MPU9250_asukiaaa.h>
#include <FastLED.h>

#define LED_PIN     5
#define NUM_LEDS    144
#define BRIGHTNESS  64
#define LED_TYPE    WS2811
#define COLOR_ORDER GRB
#define DEBUG       1
#define UPDATES_PER_SECOND 50

CRGB leds[NUM_LEDS];
int startIndex = 0;
CRGBPalette16 currentPalette;
TBlendType    currentBlending;
extern CRGBPalette16 myRedWhiteBluePalette;
extern const TProgmemPalette16 myRedWhiteBluePalette_p PROGMEM;
float gX, gY, gZ;
float aX, aY, aZ, aSqrt;

MPU9250 mySensor;

void init_mpu() {
  Wire.begin();

  mySensor.setWire(&Wire);

  mySensor.beginAccel();
  //mySensor.beginMag();
  mySensor.beginGyro();

  // you can set your own offset for mag values
  // mySensor.magXOffset = -50;
  // mySensor.magYOffset = -55;
  // mySensor.magZOffset = -10;
}
int  LED=0;
int  LASTLED=0;
void init_fastled() {
  FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection( TypicalLEDStrip );
  FastLED.setBrightness(  BRIGHTNESS );
    
  // currentPalette = RainbowColors_p;
  currentBlending = LINEARBLEND;
}

int trail(int index, int length, int direction) {
  
}
void setup() {
  while(!Serial);

  Serial.begin(115200);
  Serial.println("started");
  init_mpu();
  init_fastled();
  LED=0;
  LASTLED=0;
}

void loop() {
  mySensor.accelUpdate();
  //mySensor.magUpdate();

  aX = mySensor.accelX();
  aY = mySensor.accelY();
  int color = 255 * ((aX + 1.0) / 2.0);
  int value = 255 * ((aY + 1.0) / 2.0);
  Serial.println("color:" + String(color));
  Serial.println("value:" + String(value));
  for( int i = 0; i < 16; i++) {
    currentPalette[i] = CHSV(color, 255, value);
  }
  
  startIndex = startIndex + 5; /* motion speed */
  //FillLEDsFromPaletteColors(startIndex);
  FastLED.clear();
  leds[value/2] = CHSV(color, 255, 128);
  //leds[LASTLED] = CRGB::Purple;
  //leds[LASTLED-1] = CRGB::Black;
  
  FastLED.show();
  FastLED.delay(1000 / UPDATES_PER_SECOND);  
  

}

void FillLEDsFromPaletteColors(uint8_t colorIndex)
{
  uint8_t brightness = 255;
    
  for( int i = 0; i < NUM_LEDS; i++) {
    leds[i] = ColorFromPalette(currentPalette, colorIndex, brightness, currentBlending);
    colorIndex += 3;
  }
}