Idle callback → buat square tengah tu berpusing non-stop. Mouse left click/drag → lukis square kecik warna random. Mouse move tanpa klik → player square warna biru ikut cursor. Arrow keys → gerakkan player square macam game. Key P → pause / resume animation (tunjuk idle boleh control). Key C → clear semua square yang dilukis. Right click / Q / ESC → quit program. Resize window → scene still cantik sebab reshape callback update gluOrtho2D.