Selection Sort - OpenProcessing

mySketch
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let rectLength;
let range = 500; //Generating random numbers from 1-200
let dataSet = 500; //Total amount of numbers in dataSet
let values = [dataSet]; //Array of numbers
let rects = [dataSet]; //Rectangle representation of data values
let start = true;
let startSort = false;
let tickDelay = 1; //Speed between each iteration
let currentTick = 0; //Current Tick
let swapPos = 0; //Current position being swapped
​
function setup() {
  createCanvas(windowWidth, windowHeight);
  background(0);
  rectLength = windowWidth/dataSet;
}
​
​
​
function draw() {
  if (start)
  {
    start = false;
    for (let i = 0; i < dataSet; i++)
    {
      values[i] = random(1, range); //Creates dataSet random numbers from 1-range
      let r = rect(i*rectLength, windowHeight-values[i], rectLength, values[i]);
      rects[i] = r;
    }
    startSort = true;
  }
  
  if (startSort)
  {
    if (currentTick == tickDelay && swapPos != dataSet)
    {
      currentTick = 0;
      let low = swapPos;
      for (let i = swapPos+1; i < dataSet; i++)
      {
        if (values[i] < values[low])
        {
          low = i;
        }
      }
      let temp = values[swapPos];
      values[swapPos] = values[low];
      values[low] = temp;
      background(0);
      textAlign(CENTER);
      textSize(50);
      fill(255, 255, 255);
      text("Selection Sort", windowWidth/2, 100);
      for (let i = 0; i < dataSet; i++)
      {
        if (i == swapPos+1)
        {
          fill (255,0 ,0);
        }else {
          fill (255,255, 255);
        }
        let r = rect(i*rectLength, windowHeight-values[i], rectLength, values[i]);
        rects[i] = r;
      }
      swapPos++;
    }else {
      currentTick++;
    }
  }
}