My Sketch

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let scale = 20;

let heart;

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let iValues = [];

let bValues = [];

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let ibValues = [];

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let xValues = [];

let yValues = [];

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let X1 = 562.5;

let Y1 = 1000;

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let X2 = 0;

let Y2 = 0;

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let allValues = [];

let total = 0;

let timesRan = 0;

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function setup() {

  createCanvas(1125, 2436);

  background(255,192,203);

  // background(12.2, 0, 20);

}

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function preload() {

  heart = loadImage('black.png');

}

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function draw() {

  if (frameCount == 1) {

    heart.resize(1125 / scale, 2436 / scale);

    loadPixels();

    heart.loadPixels();

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    for (y = 0; y < heart.height; y = y + 1) {

      for (x = 0; x < heart.width; x = x + 1) {

        let index = (x + y * heart.width) * 4;

        let r = heart.pixels[index];

        let g = heart.pixels[index + 1];

        let b = heart.pixels[index + 2];

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        let brightness = (r + g + b) / 3;

        let brightnessValue = (brightness - 255) * -1;

        if(brightnessValue < 50){

          brightnessValue = 0;

        }else{

          brightnessValue = 1;

        }

​

        bValues.push(brightnessValue);

        iValues.push(index / 4);

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        xValues.push(x * scale);

        yValues.push(y * scale);

        allValues.push(index / 4);

        if(brightnessValue > 0){

        total = total + 1;

        }

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​

      }

    }

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//    let firstNum = firstWeightedRandom();

//    X1 = xValues[firstNum];

//    Y1 = xValues[firstNum];

  }

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  if (frameCount % 1 == 0 && timesRan < total) {

    let currentNumb = weightedRandom();

    if(currentNumb > -1){

    X2 = xValues[currentNumb];

    Y2 = yValues[currentNumb];

    stroke(22,165,150);

      strokeWeight(2);

    line(X2,Y2,X1,Y1);

    X1 = X2;

    Y1 = Y2;

    }

  }

}

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function firstWeightedRandom(){

  let numbs = [];

  for (i = 0; i < iValues.length; i = i + 1) {

      for(j = 0; j < bValues[i]; j = j + 1) {

        numbs.push(iValues[i]);

    }

    }

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  return random(numbs);

} 

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function weightedRandom(){

  let numbs = [];

  for (i = 0; i < iValues.length; i = i + 1) {

    if(dist(xValues[i],yValues[i],X1,Y1) < 40 && dist(xValues[i],yValues[i],X1,Y1) > 7.5 && allValues[i] > -0.5){

      for(j = 0; j < bValues[i]; j = j + 1) {

        numbs.push(iValues[i]);

      }

    }

    }

  let xxx = random(numbs)

  allValues[xxx] = -1;

  if(numbs.length = 0){

    return -10

  }else{

  return xxx;

  }

}