tailieunhanh - Flash CS4 Professional in 24 Hours- P7

Flash CS4 Professional in 24 Hours- P7: The creation of this book could not have happened without the skill and patience of many, many people at Sams Publishing. Most of all, I want to thank Mark Taber for offering me this opportunity and Philip Kerman for writing such a great book. I also greatly appreciate the efforts of Songlin Qiu for keeping me on track and organized, not an easy task. | Fine-Tuning a Motion Tween 171 TRY IT YOURSELF FIGURE This S-curve graph makes a single tween that eases in and eases out. Make an Animation Ease In and Ease Out Notice that as time passes at the beginning the graph is mainly horizontal meaning it s not completing much of its tween. Then in the middle it s nearly a vertical line meaning it is doing most of its tween. Finally it slows back down as it approaches the end. You can click anywhere between the two keyframes and press F5 many times to insert more frames. Also you can crank up the frame rate to something relatively fast like 50fps. To change the frame rate select Modify Document or press Ctrl J. Both edits should make the tween more obvious. You might have noticed the list of other preset eases under the plus sign menu next to the Eases section. Take a look at them now. Most have names that clearly describe what effect they have on the speed of your motion tween. Figure shows the Spring easing effect graph. In the figure we ve applied it to our tween by selecting it from the drop-down list next to Basic Motion. Give it a try it s a really cool effect. The number to the right of the label Spring is currently set to 5 this means it seems to spring five times lessening each time. You can change this number to increase or decrease the springiness. 172 HOUR 8 Using Motion Tweens to Animate FIGURE The Spring ease effect makes your animated symbol move as though it s attached to a spring. CAUTION Less Is More Gratuitous animation is a fine example of having too much of a good thing. There s no harm in playing with all the bells and whistles available in Flash. In fact while you are learning Flash you should play with everything. But when you create that Flash movie for your website a little animation goes a long way. Too much can make your work look unprofessional. Remember the point of using Flash is to create animation. To effectively communicate an idea or tell a story you should refrain from .