Twinkle[] twinkle = new Twinkle[10];

void setup() 
{
  size(640, 360);

   background(0);

   fill(0,0,0,0);
   frameRate(30);
    
  for(int i = 0; i < 10; i++) {
    twinkle[i] = new Twinkle();
  }  
}

void draw() 
{
  for(int i = 0; i < 10; i++) {
    twinkle[i].update();
  }  
  
  background(0);
  for(int i = 0; i < 10; i++) {
  
    twinkle[i].draw();
  }
  
  
}
class Twinkle {
 
  private float[] lastX = new float[4];
  private float[] lastY = new float[4];
  int[] colorVal = new int[3];
  
  public Twinkle() {
    lastX[0] = 320;
    lastY[0] = 180;
    lastX[1] = 320;
    lastY[1] = 180;
    lastX[2] = 320;
    lastY[2] = 180;
    lastX[3] = 320;
    lastY[3] = 180;
    
    colorVal[0] = (int)random(0, 255);
    colorVal[1] = (int)random(0, 255);
    colorVal[2] = (int)random(0, 255);
  }
  
 public void update() {
  float newX = lastX[3];
  float newY = lastY[3];
  
  float differenceX = random(-width / 4, width / 4);
  float differenceY = random(-height / 4, height / 4);
  
  if(abs(differenceX) < 1) {
   differenceX = 0;
  }
  if(abs(differenceY) < 1) {
   differenceY = 0; 
  }
  
  newX += differenceX;
  newY += differenceY;

  newX = constrain(newX, 0, width);
  newY = constrain(newY, 0, height);
  
  lastX[0] = lastX[1];
  lastY[0] = lastY[1];
  lastX[1] = lastX[2];
  lastY[1] = lastY[2];
  lastX[2] = lastX[3];
  lastY[2] = lastY[3];  
  lastX[3] = newX;
  lastY[3] = newY;
 }

  public void draw() {
     stroke(colorVal[0], colorVal[1], colorVal[2]);
   curve(lastX[0], lastY[0], lastX[1], lastY[1], lastX[2], lastY[2], lastX[3], lastY[3]);
  } 
}