初等函数的视觉实验

//processing IDEArrayList<PVector> pos;ArrayList<Cs> cs;void setup() {  size(640, 290);  pos = new ArrayList<PVector>();  cs = new ArrayList<Cs>();}void draw() {  background(0);  generate();  for (int i = pos.size()-1; i>=0; i--) {        cs.get(i).editvalue(pos.get(i).x, pos.get(i).y);    if (cs.get(i).Dead()) {        cs.remove(i);      pos.remove(i);    }  }  fill(255);  text(nfc(frameRate, 1), 20, 20);}void generate() {  float d = dist(mouseX, mouseY, pmouseX, pmouseY);  println(d);  if (d > 12) {    cs.add( new Cs());    pos.add(new PVector(mouseX, mouseY));  }}class Cs {  float r;  float alpha = 255;  float zs = 0;  float bs =  0;  Cs() {    r = random(1, 170);  }  void editvalue(float x, float y) {    bs = pow(2, -zs);    noFill();    stroke(255, alpha*bs);    strokeWeight(2);    ellipse(x, y, r*(1-bs), r*(1-bs) );    zs+=0.06;  }  boolean Dead() {    if (alpha*bs <=1) {      return true;    } else {      return false;    }  }}