Flow field #2

const stars=[]

const blackholes=[]

​

setup=()=>{

  createCanvas(800,800)

  background(0)

  strokeWeight(2)

  colorMode(HSB,360)

  for(let i=2e3;i--;){

    stars[i]={

      x:cos(i)*300,

      y:sin(i)*300,

      colour:i%360

    }

  }

  for(let i=4;i--;){

    blackholes[i]={

      x:random(-250,250),

      y:random(-250,250)

    }

  }

}

​

draw=()=> {

  translate(width/2,height/2)

​

  for(const s of stars){

    let direction=0

    for(const b of blackholes){

      direction+=atan2(b.y-s.y,b.x-s.x)*2

    }

    stroke(s.colour,360,360)

    line(s.x,s.y,s.x+=cos(direction)*5,s.y+=sin(direction)*5)

  }

}

​

mousePressed=_=>setup()