When is animation performed?

• Simple case: time-based animation
  • begin, dur, end attributes
  • values are in time (with "t = 0" value at loading)
  • all kinds of time units are available
• Complicated case: event-based animation
  • begin attribute can refer to events, eg:
    • obj.click, when a click occurs on obj
    • anim.end or anim.begin, when anim ends, resp. begins
    • anim.end; anim2.end, when anim or anim2 ends
    • anim.begin+4s 4 seconds afteranim begins
    • obj.mouseover, obj.mouseout when mouse moves over/out obj
    • ...