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Add some more interesting boundary behavior

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This commit is contained in:
Chris Hodapp 2020-07-11 16:53:42 -04:00
parent 3e4804bced
commit 9bfa83594f
1 changed files with 29 additions and 11 deletions
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40
src/curlnoise/core.cljc
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@ -6,9 +6,9 @@
(def res-x 500) (def res-x 500)
(def res-y res-x) (def res-y res-x)
;; Lower grid size produces more points ;; Lower grid size produces more points
(def grid-size 20) (def grid-size 10)
;; Lower alpha produces *longer* particle trails ;; Lower alpha produces *longer* particle trails
(def alpha 20) (def alpha 40)
(def renderer #?(:clj :java2d (def renderer #?(:clj :java2d
:cljs :p2d)) :cljs :p2d))
@ -90,13 +90,13 @@
(let [w (q/width) (let [w (q/width)
h (q/height) h (q/height)
;; Overall multiplier for velocity of particle: ;; Overall multiplier for velocity of particle:
vf 0.2 vf 0.1
;; Domain scale for noise function: ;; Domain scale for noise function:
scale 400.0 scale 400.0
;; Amplitude multiplier for noise: ;; Amplitude multiplier for noise:
noise-scale (* scale 3.0) noise-scale (* scale 10.0)
;; Radius for mouse-thingy: ;; Radius for mouse-thingy:
rad 50.0 rad 20.0
;; Radius for rounded corners: ;; Radius for rounded corners:
rect-rad 100.0 rect-rad 100.0
margin 0 margin 0
@ -120,16 +120,26 @@
(- h (* rect-rad 2)) ; height (- h (* rect-rad 2)) ; height
)) ))
;; potential modulation function - takes (x,y): ;; potential modulation function - takes (x,y):
amp-fn #(ramp (min (/ (d-mouse %1 %2) d0) amp-fn (fn [_ _] 1.0)
(/ (d-border %1 %2) d0))) ;; #(ramp (min (/ (d-mouse %1 %2) d0)
;; (/ (d-border %1 %2) d0)
;; ))
mouse-drift #(if (q/mouse-pressed?)
(+
(* (- (/ mx w) 0.5) %2 0.01)
(* (- (/ my h) 0.5) %1 -0.01))
0.0)
;; Noise function - must take 3 arguments, (x,y,z): ;; Noise function - must take 3 arguments, (x,y,z):
n-fn #(* noise-scale (q/noise (* f-inv %1) (* f-inv %2) (* f-inv %3))) n-fn #(* noise-scale
(+
(mouse-drift %1 %2)
(q/noise (* f-inv %1) (* f-inv %2) (* f-inv %3))))
;; Overall amplitude function: ;; Overall amplitude function:
p-fn #(* vf (amp-fn %1 %2) (n-fn %1 %2 %3)) p-fn #(* vf (amp-fn %1 %2) (n-fn %1 %2 %3))
points points
(map (fn [pt] (map (fn [pt]
(let [[i j x y] pt (let [[i j x y] pt
z (/ (:frame state) 50.0) z (/ (:frame state) 20.0)
border (if (and (and (> x margin) (< x (- w margin))) border (if (and (and (> x margin) (< x (- w margin)))
(and (> y margin) (< x (- h margin)))) (and (> y margin) (< x (- h margin))))
1.0 0.0) 1.0 0.0)
@ -142,8 +152,16 @@
vy (/ (- n n-dx) eps) vy (/ (- n n-dx) eps)
;; Updated point position: ;; Updated point position:
x2 (+ x vx) x2 (+ x vx)
y2 (+ y vy)] y2 (+ y vy)
[i j x2 y2] [x3 y3] (if (or (< x2 0) (> x2 w) (< y2 0) (> y2 h))
[(q/random w) (q/random h)]
[x2 y2])
;; This boundary behavior is a little more
;; interesting: when a particle leaves the edges,
;; it just reappears in a random place.
]
[i j x3 y3]
)) (:grid state))] )) (:grid state))]
(-> state (-> state
(update :frame inc) (update :frame inc)