platforms.js

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display.color = color.hsb(0,0,0,10);

[
  [250, 150, 600, 15],
  [710, 275, 600, 15],
  [250, 400, 600, 15],
  [710, 525, 600, 15]
].each((ar, i) => {
  let f = display.rect(...ar)
  f.angle = (i == 1 || i == 3) ? -15 : 15
  f.color = color.clear
  let ang = ((f.y / display.height * 360) + 180) % 360
  f.borderColor = color.hsb(f.y / display.height * 360, 55, 95)
  f.borderWidth = 0.25
  physics.add(f, { static: true })
})

repeat(200, () => {
  let c = display.circle(100, 50, 5)
  c.color = color.hsb(0, 55, 95)
  physics.add(c, { friction: 0.5, bounce: 0.7, density: 1 })
})

update(() => {
  display.each("circle", (el) => {
    el.ifOnEdgeContinue()
    el.color.hue = el.y / display.height * 360
  })
})