js-tetris - animate

main.js

function animate(now = 0) {
  // Update elapsed time.  
  time.elapsed = now - time.start;
  
  // If elapsed time has passed time for current level  
  if (time.elapsed > time.level) {
  
    // Restart counting from now
    time.start = now;   
    
    this.drop();  
  }
  
  // Clear board before drawing new state.
  ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height); 
  
  board.draw();  
  requestId = requestAnimationFrame(animate);
}