Electric Sphere

var pathPoints = []

​

function setup() {

  createCanvas(500, 500); 

  background(0);

} 

​

function draw() {

  //create the path

  pathPoints = circlePoints();

  for(var j=0;j<6;j++){

  pathPoints = complexifyPath(pathPoints);

  }

​

  //draw the path

  stroke(255,15);

  for(var i=0;i<pathPoints.length -1;i++){

    var v1 = pathPoints[i];

    var v2 = pathPoints[i+1];

    line(v1.x,v1.y,v2.x,v2.y);

  }

}

​

function complexifyPath(pathPoints){

  //create a new path array from the old one by adding new points inbetween the old points

  var newPath = [];

  for(var i=0;i<pathPoints.length -1;i++){

    var v1 = pathPoints[i];

    var v2 = pathPoints[i+1];

    var midPoint = p5.Vector.add(v1, v2).mult(0.5);

    var distance =  v1.dist(v2);

    //the new point is halfway between the old points, with some gaussian variation

    var standardDeviation = 0.125*distance;

    var v = createVector(randomGaussian(midPoint.x,standardDeviation),randomGaussian(midPoint.y,standardDeviation))

    append(newPath,v1);

    append(newPath,v);

  }

  //don't forget the last point!

  append(newPath,pathPoints[pathPoints.length-1]);

  return newPath;  

}

​

function circlePoints() {

  //two points somewhere on a circle

  var r = width/2.1;

  //var theta1 = random(TWO_PI);

  var theta1 = randomGaussian(0,PI/4);

  var theta2 = theta1 + randomGaussian(0,PI/3);

  var v1 = createVector(width/2 + r*cos(theta1),width/2 + r*sin(theta1));

  var v2 = createVector(width/2 + r*cos(theta2),width/2 + r*sin(theta2));

  return [v1,v2];

}