gibber_canvas.js

ctx = Graphics.two()
   
let x = 0  
onframe = function(timestamp) {
  const w = Graphics.canvas.width, h = Graphics.canvas.height
  
  ctx.strokeStyle = 'green'
  ctx.clearRect( 0,0,w,h )
  const size = 300
  
  ctx.save()
  ctx.setTransform(1,0,0,1,Math.random()*100+300,Math.random()*100+300)
  ctx.rotate(x)
  ctx.strokeRect( -size/2, -size/2, size, size)
  ctx.restore()
  x += .01
  requestAnimationFrame( onframe )
}
   
onframe()