Animation is the rapid display of a sequence of images to create an illusion of movement. The most common method of presenting animation is as a motion picture or video program, although there are other methods. This type of presentation is usually accomplished with a camera and a projector or a computer viewing screen which can rapidly cycle through images in a sequence. Animation can be made with either hand rendered art, computer generated imagery, or three-dimensional objects, e.g. puppets or clay figures, or a combination of techniques. The position of each object in any particular image relates to the position of that object in the previous and following images so that the objects each appear to fluidly move independently of one another. The viewing device displays these images in rapid succession, usually 24, 25 or 30 frames per second.
Types of Animation
There are three types of animation in Flash - Motion, Shape and Frame-by-Frame tween. "Tweening" is a term coined by the pioneers of Flash to denote in-betweening. You will learn what in-betweening means in the next section when we discuss frames and keyframes. Scroll down to see more.
Frame-by-frame was the conventional way of authoring animation. Real movies are really a form of frame-by-frame animation. Each frame contains different content and animation is achieved by running the playhead through the frames. In Flash, a keyframe can be a frame that effect a change in an animation or when it holds new content, Frame-by-frame animation is very tedious or painstaking to develop but it is sometimes necessary.
Motion tween can be referred to an object that travels from one point to another and involves no change of shape over time. Sometimes motion tween can also mean changing colours over time. In Flash, the Playhead sweeps the frames from left to right. To author motion tween in Flash, you place a graphic in the first frame (a keyframe) and one in the last frame (another keframe) and tell Flash to spread the change in position over a certain number of frames. Click the image to playback movie.
Shape tween means an object travels from one point to another and involves change of shape over time. Sometimes motion tween can also mean a stationary object changing shape over time. Click the image to playback movie.
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