SOURCE

var speed=15;
var d=50;
var x;
var y;
var c=0;
var h=1
function setup(){
  createCanvas(480,480);
  x=width/2;
  y=height/2;
  colorMode(HSB,109,170,10,0);
}
function draw(){
  c+=h;
  if(c>155||c<=0){
    h=-h;
  }
  noStroke();
  fill(c,100,100,1);
  x+=random(-speed,speed);
  y+=random(-speed,speed);
  x=constrain(x,0,width);
  y=constrain(y,0,height);
  triangle(x,y,x+30,y+50,x-30,y+50);

}

<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.1.9/p5.min.js"></script>