// Partner Challenge with Billy Ho

​

let lineCount = 0;

const margin = 3;

const pointCount = 10;

let maxAmplitude = 0.2;

​

// the point of Billy's "cross"

let pX = 0;

let pY = 0;

​

function setup() {

  createCanvas(430, 400);

  maxAmplitude = height*maxAmplitude

  lineCount = (height+maxAmplitude) / margin;

  noFill();

  stroke("#00f");

  strokeWeight(0.4);

  pX = width*0.5;

  pY = height*0.7;

  noLoop();

}

​

function draw() {

  background(0);

​

  translate(0,-1*maxAmplitude)

  for( let l = 0; l < lineCount; l++ ){

    beginShape()

    for( let i = 0; i <= pointCount; i++ ){

      const tX = map( i, 0, pointCount, 0, width )

      const tY = l * margin

      let n = noise( i * 2, l * 0.1 )

      n *= map( dist(pX, pY, tX, tY), 0, width*0.8, 0, 1)

      let double = 1

      if( i === 0 || i === pointCount ){

        double = 2

      }

      for( let d = 0; d < double; d++ ){

        curveVertex( tX, n * maxAmplitude + tY )

      }

    }

    endShape()

  }

}