MACROMEDIA DIRECTOR MX 2004-GETTING STARTED WITH DIRECTOR Manual de usuario descargar pdf (Pagina 73)

Writing scripts to control the movie 73

Digital video movies use a timeline instead of a Score. The timing of the video playback is tied

closely to the sound track of the video. For example, if the video has a sound track, the timing of

the video and sound must remain synchronized during the entire playback of the video. For this

reason, digital videos will skip frames if necessary to keep up with the sound track. On slower

computers, several frames might be skipped during video playback. This kind of animation is

called time-based. These differences are the reason you navigate a Director movie by jumping to

different frames in the movie, and you navigate a digital video by jumping to different times

within the video.

Now you are ready to add scripts to the bitmap graphic buttons for controlling the digital video

playback. The bitmap graphic buttons are a Play button, a Pause button, and a Rewind button.

For these buttons, you use some new scripting terms, including the

movieRate and movieTime

properties of the QuickTime sprite. By changing the values of these properties with Lingo, you

change the way the video plays on the Stage.

When the user navigates to the sound and video scene from a different scene, the digital video

plays from start to finish once. To play the video again without first leaving the scene, you need to

rewind it. You rewind the video by setting its

movieTime property.

The

movieTime property indicates the time, within the digital video, that currently appears on

the screen. The

movieTime is measured in ticks, or 60ths of a second. For example, when the

movie displays the very first frame of video, the

movieTime is 0. When 1 second of the video has

played, the

movieTime equals 60. When 3 seconds of the video have played, the movieTime

equals 180. By setting the

movieTime to a number that you select, you can make the video jump

to a different frame.

Rewind the QuickTime sprite

You can rewind the QuickTime sprite by setting its

movieTime to 0.

1 In the Score, display frames 55 through 64.

2 In frames 55 through 64, right-click (Windows) or Control-click (Macintosh) the Rewind

button sprite.

3 Select Script from the context menu.

The Script window opens with a default

on mouseUp handler already entered.

4 On the second line of the handler, type the following Lingo to rewind the QuickTime sprite:

sprite(1).movieTime = 0

5 Press Enter (Windows) or Return (Macintosh).

6 On the third line of the handler, type the following Lingo:

sprite(1).movieRate = 0

The movieRate property indicates the speed at which the QuickTime sprite is playing. When

the video is stopped, the

movieRate is 0.

The result looks like this:

On mouseUp me

sprite(1).movieTime = 0

sprite(1).movieRate = 0

end

7 In the Name text box at the top of the Script window, type RewindScript.

8 Close the Script window, and save your movie.

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