otion ngụ ý thời gian. Một đối tượng tĩnh, chẳng hạn như một trang web HTML thông thường, có thể tồn tại trong một thời điểm hoặc trong khoảng thời gian của thời gian. Ngược lại, các đối tượng chuyển động (chẳng hạn như các lớp năng động HTML bay trên màn hình) cần một vài giây để hoàn thành con đường của mình. | C H Working with Timelines Motion implies time. A static object such as an ordinary HTML Web page can exist either in a single moment or over a period of time. Conversely moving objects such as Dynamic HTML layers flying across the screen need a few seconds to complete their path. All of Dreamweaver s Dynamic HTML animation effects use the Timeline feature to manage this conjunction of movement and time. Timelines can do much more than move a layer across a Web page however. A timeline can coordinate an entire presentation starting the background music scrolling the opening rolling credits and cueing the voice-over narration on top of a slideshow. These actions are all possible with Dreamweaver because in addition to controlling a layer s position timelines can also trigger any of Dreamweaver s JavaScript behaviors on a specific frame. This chapter explores the full and varied world of timelines. After an introductory section brings you up to speed on the underlying concepts of timelines you learn how to insert and modify timelines to achieve cutting-edge effects. A Dreamweaver Technique shows you step by step how to create a multiscreen slideshow complete with fly-in and fly-out graphics. From complex multilayer animations to slideshow presentations you can do it all with Dreamweaver timelines. Note Because timelines are so intricately intertwined with layers and behaviors you need to have a good grasp of these concepts. If you re not familiar with the topics of layers and behaviors be sure to read Chapters 21 and 23. Into the Fourth Dimension with Timelines Web designers in the early days had little control over the interaction between their Web pages and the fourth dimension time . Only animated GIFs Java or animation programs such as Macromedia s Flash could create the illusion of motion events. Unfortunately all of these technologies have some limitations. In This Chapter Adding animation with Dreamweaver timelines Using the Timelines panel Incorporating .
