Light of LED increases as button is held down

/*
 * Manvi Mittal
 * Increasing Intensity
 */

 const int pinLed = 6;
 const int pinButton = 2;
 int readValue = 0;
 boolean lightOn = 0;

void setup()
{
  // put your setup code here, to run once:
  pinMode (pinButton, INPUT);
  pinMode (pinLed, OUTPUT);

  Serial.begin (9600);

  digitalWrite (pinLed, HIGH);
  delay (50);
  digitalWrite (pinLed, LOW);

}

void loop()
{
  // put your main code here, to run repeatedly:
  readValue = digitalRead (pinButton);

  if (readValue == 1)
  {
    for (int i = 0; i <= 200; i++)
    {
      analogWrite (pinLed, i);
      delay (50);
    }
  }
  else
  {
    digitalWrite (pinLed, LOW);
  }
}