ameboid movement

int SIZE=8;

int W=720;

int SPEED=10;

int NUM=99;

int RANGE=200;

​

Particle[] P= new Particle[NUM];

​

class Particle {

  float x, y;

  float vx, vy;

  Particle() {

    this.x=int(random(width)/SIZE)*SIZE;

    this.y=int(random(height)/SIZE)*SIZE;

    this.vx=(cos(random(TAU)))/SPEED;

    this.vy=(sin(random(TAU)))/SPEED;

  }

}

​

void setup() {

  size(720, 720);

  rectMode(CENTER);

  noStroke();

  for (int i=0; i<NUM; i++) {

    P[i]=new Particle();

  }

}

​

void draw() {

  clear();

  int f=0;

  for(int d=RANGE;d>6;d-=SIZE*2,f=1-f){

     fill(f*255);

    for(Particle p : P){

      p.x+=p.vx;

      p.y+=p.vy;

      if(p.x<0 || p.x>W){p.vx=-p.vx;}

      if(p.y<0 || p.y>W){p.vy=-p.vy;}

      ellipse(p.x,p.y,d,d);

    }

}}

​