Processing で タイマースレッド (Timer thread programming in your Processing sketch)

Processingでタイマースレッドを使う方法は以下
(How to implement a timer thread in your Processing sketch)

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Thread thread1; // thread for timer
boolean tick;

void setup() {
  size(400, 300);
  tick = false;
  thread1 = new Thread(new timerThread());
  thread1.start();
}

void draw() {
  background(255);
  if (tick) line(10, 10, 100, 10);
  else line(10, 10, 10, 100);
}

// thread for 1 sec. timer
class timerThread implements Runnable {
  public synchronized void run() {
    while (true) {
      try{
        Thread.sleep(1000);
      } catch (InterruptedException e) {}
      tick = !tick;
    }
  }
}