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fact file4.7 Tweening


As you learned in Section 2 and experienced briefly if you followed the first tutorial in this section 'How to start a keyframe animation', tweening is the process of producing intermediate frames "in between" the key frames of an animation to give the impression of continuous movement. When compared with stop-frame animation, keyframe animation offers a more powerful and efficient technology that saves you from having to draw every single frame.

Essentially, the technique lets you generate key frames containing key objects that can be assigned a position, rotation, and different attributes or actions. Intermediate steps between key objects are created automatically by DrawPlus and produce a smooth natural transition.

pond life

The 'Pond life' storyboard illustrated uses two clipart characters from the Animals subfolder in the Gallery's Clipart collection. The animation consists of a tween in four steps between the first and last frames: the frog moves from bottom left to bottom centre; the fly changes position from top right to centre bottom.

The key objects (frog and fly) are positioned in the first key frame and automatically copied or run forward by DrawPlus in subsequent frames, after you have repositioned them in the final keyframe. It is this repositioning that creates the movement and generates the tweened frames The frog's tongue is introduced in frame 4 only and the fly is made 100% transparent in the final two frames, so that it seems to disappear down the frog's throat.

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