# 163a Scale Green

```
(define
step-y (/ 1000 {8 (gen/int min: 6 max: 10)})
step-x (/ 1000 {10 (gen/int min: 8 max: 12)}))
(fn (interesting-circle position: [500 500]
colour: red
seed: 564
radius: 300)
(define
rng (prng/build seed: seed)
outer-exterior (prng/build seed: (prng/value from: rng) min: 170 max: 210)
outer-interior (prng/build seed: (prng/value from: rng) min: 80 max: 170)
inner-exterior (prng/build seed: (prng/value from: rng) min: 100 max: 150)
inner-interior (prng/build seed: (prng/value from: rng) min: 0 max: 100)
srng (prng/build min: -1 max: 1 seed: seed))
(on-matrix-stack
(translate vector: position)
(scale scalar: (/ radius 210))
(loop (i to: 8)
(on-matrix-stack
(rotate angle: (* 360 (prng/value from: rng)))
;; outer ring
(circle-slice tessellation: 30
position: [0 0]
colour: (col/lighten colour: colour
value: (* {411 (gen/stray-int from: 411 by: 10)} (prng/value from: srng)))
angle-start: 0
angle-end: 320
width: (prng/value from: outer-exterior)
inner-width: (prng/value from: outer-interior)
height: (prng/value from: outer-exterior)
inner-height: (prng/value from: outer-interior))
;; inner ring
(circle-slice tessellation: 10
position: [0 0]
colour: (col/lighten colour: colour
value: (* {24 (gen/stray-int from: 24 by: 10)} (prng/value from: srng)))
angle-start: 0
angle-end: 320
width: (prng/value from: inner-exterior)
inner-width: (prng/value from: inner-interior)
height: (prng/value from: inner-exterior)
inner-height: (prng/value from: inner-interior))))
;; centre fill
(circle-slice tessellation: 10
position: [0 0]
colour: (col/lighten colour: colour
value: (* {140 (gen/stray-int from: 140 by: 10)} (prng/value from: srng)))
angle-start: 0
angle-end: 360
radius: 30)))
(define initial-seed (prng/build seed: {77 (gen/int max: 1000)} min: 1 max: 1000))
(on-matrix-stack
(translate vector: [500 500])
(scale scalar: {1.320 (gen/scalar min: 1 max: 2)})
(rotate angle: {156 (gen/stray-int from: 156 by: 40)})
(loop (y from: -500 upto: 500 inc: step-y)
(loop (x from: -500 upto: 500 inc: step-x)
(interesting-circle position: [x y]
seed: (prng/value from: initial-seed)
radius: {98 (gen/int min: 70 max: 100)}
colour: {(col/rgb r: 0.053 g: 0.613 b: 0.424 alpha: 0.400) (gen/col alpha: 0.4)}))))
```