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I’m still planning to post a technical explanation on that process if anyone is interested.
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I used many of the same techniques that I created for the MotionSketch tool to interact with the new tweening model. When you import and export, you can any number of the eases available.
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You can re-apply the ease and uncheck X and rotation, and check the box that says, “Set unchecked properties to ‘No Ease’.” This will remove the first ease that you applied from the X and rotation properties, and apply the new ease to the Y property only. For instance, suppose you just applied an ease to X, Y, and rotation (Z)–the default–, but you only wanted the ease to be applied to Y.
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If you want the settings to overwrite existing applied eases, you can check this box. And, since recording the demo, I’ve also added an overwrite option to this box. This keeps you from having to open the massive Motion Editor editor panel, while still taking advantage of much of the power and flexibility that the new motion model offers. When applying a stored ease to a new motion tween, you can choose to apply it to the available properties that currently have keyframes. I used Singularity’s FastBezier Actionscript class to draw quadratic bezier curves from the cubic curve data ( explanation here). There’s an adjustable preview at the top gives an approximation of the easing curve. Eases within the panel can be renamed by simply double-clicking on their names. The panel is sortable by column, and has a filter field, in case you collect a large number of eases. So you can even save eases from your Flash CS4 Motion Editor panel and send them to someone who has Flash CS3, or open up old files and reuse your classic tween eases on the new motion tweens. You can save both classic (pre-CS4 motion tween) eases and object (new motion tween, as of CS4) eases, and apply one to the other. You can save your eases to a file and send them to someone else. The EaseCaddy panel allows you to store your custom eases and re-apply them. But what if you want to apply an ease from a motion preset, but not overwrite your existing animation? Or apply the effect to a different property? Hence I’ve titled this post, “The Missing Flash Panel.” In fact, I modeled the visual design and functionality of EaseCaddy on the Motion Presets panel. The Motion Presets panel that comes with CS4 is a great way to store and quickly apply entire animations that include easing. And I’ll go out on a limb here, there was no way to transfer an ease from a classic tween to a motion tween or vice versa…that is, until EaseCaddy. Custom eases can be cumbersome to transfer eases across tweens and across files. A custom ease cannot be transferred from one tween to another ( UPDATE: you can copy/paste curves in the motion editor–a great feature that I somehow missed. One area where a lot of time can be lost is in recreating custom eases. Put simply, the upshot of the Motion Editor is control and precision, the downside is time and complexity. The Motion Editor panel allows for extremely precise control of each individual animation property as well as custom easing curves. Along with the brilliant new tweening model in Flash CS4, the Flash team has given us the powerful, but somewhat daunting, Motion Editor panel.