Demonstration of averaging an array of values in Processing

AverageDemo.pde

// Average of values over time
// Daniel Shiffman

int[] values = new int[20];

void setup() {
  size(300, 300);
}

void draw() {
  background(0);
  
  // Shift all values
  for (int i = 0; i < values.length-1; i++) {
    values[i] = values[i+1];
  }
  // Get the new value
  values[values.length-1] = mouseX;

  // Calculate average
  float avg = 0;
  for (int i = 0; i < values.length; i++) {
    avg += values[i];
  }  
  avg /= values.length;
  
  // Draw raw value and average to compare
  ellipse(mouseX, 100, 32, 32);
  ellipse(avg, 200, 32, 32);
}