つぶやきProcessing (2025/10/30)

https://scrapbox.io/files/69036279453f89a38fd378a1.mp4

でも、もはや角度とか計算する必要なさそう。

code:processing

//#つぶやきProcessing

float w=200, r, p, s=PI/6, t;

void setup() {

size(800, 800);

}

void draw() {

background(-1);

t=t>TAU?0:t;

fill(0, 128-128*cos(t));

for (r=0; r<TAU; r+=s) {

p=acos(dist(w*cos(r), w*sin(r), w*cos(r+s), w*sin(r+s))/w);

arc(w*cos(r)+400, w*sin(r)+400, w, w, p+r-s/2+t, TAU-p+r-s/2+t);

}

t+=.01;

}