Purple DS Composer contains a full-fledged animation tool. This allows all elements on the stage to be freely animated. Keyframe animations consists essentially of two key frames: a keyframe that describes the state at the beginning and a keyframe that describes the state at the end of the animation. The Composer automatically calculates all states between the keyframes, the "in-betweens", creating a fluid animation.
The "Charts" sample, which is given after starting the Composer, contains examples for using keyframe animation.
You can find our video tutorial on keyframe animation on YouTube: