Control RGB LED with Joystick

const int PUSHBUTTON_PIN = 2; 
const int RED_PIN = 11; 
const int GREEN_PIN = 10; 
const int BLUE_PIN = 9; 

const int redX = 512;
const int redY = 1023;
const int greenX = 1023;
const int greenY = 0;
const int blueX = 0;
const int blueY = 0;

void setup() {
  Serial.begin(9600);
  // Set the Joystick button as an input
  pinMode(PUSHBUTTON_PIN, INPUT); 
  digitalWrite(PUSHBUTTON_PIN, HIGH);

  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);
}

void loop() {
  int xAxis = analogRead(A0);
  int yAxis = analogRead(A1);

  // Flip orientation (if needed)
  xAxis = map(xAxis, 0, 1023, 0, 1023);
  yAxis = map(yAxis, 0, 1023, 1023, 0);

  int distanceRed = sqrt(pow(abs(redX - xAxis), 2) +  pow(abs(redY - yAxis), 2));
  int distanceGreen = sqrt(pow(abs(greenX - xAxis), 2) +  pow(abs(greenY - yAxis), 2));
  int distanceBlue = sqrt(pow(abs(blueX - xAxis), 2) +  pow(abs(blueY - yAxis), 2));

  int brightRed = 255 - constrain(map(distanceRed, 0, 1023, 0, 255), 0, 255);
  int brightGreen = 255 - constrain(map(distanceGreen, 0, 1023, 0, 255), 0, 255);
  int brightBlue = 255 - constrain(map(distanceBlue, 0, 1023, 0, 255), 0, 255);

  if (digitalRead(PUSHBUTTON_PIN) == 0) {
      brightRed = 255;
      brightGreen = 255;
      brightBlue = 255;
  }
  
  analogWrite(RED_PIN, brightRed);
  analogWrite(GREEN_PIN, brightGreen);
  analogWrite(BLUE_PIN, brightBlue);

  Serial.print("KEY: ");
  Serial.print(digitalRead(PUSHBUTTON_PIN));
  Serial.print(", X: ");
  Serial.print(xAxis);
  Serial.print(", Y: ");
  Serial.print(yAxis);
  Serial.print(", R: ");
  Serial.print(brightRed);
  Serial.print(", G: ");
  Serial.print(brightGreen);
  Serial.print(", B: ");
  Serial.print(brightBlue);
  Serial.println("\n");
 
  delay(100);
}