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Creating an animated data video enriched with audio narration takes asignificant amount of time and effort and requires expertise. Users not onlyneed to design complex animations, but also turn written text scripts intoaudio narrations and synchronize visual changes with the narrations. This paperpresents WonderFlow, an interactive authoring tool, that facilitatesnarration-centric design of animated data videos. WonderFlow allows authors toeasily specify a semantic link between text and the corresponding chartelements. Then it automatically generates audio narration by leveragingtext-to-speech techniques and aligns the narration with an animation.WonderFlow provides a visualization structure-aware animation library designedto ease chart animation creation, enabling authors to apply pre-designedanimation effects to common visualization components. It also allows authors topreview and iteratively refine their data videos in a unified system, withouthaving to switch between different creation tools. To evaluate WonderFlow'seffectiveness and usability, we created an example gallery and conducted a userstudy and expert interviews. The results demonstrated that WonderFlow is easyto use and simplifies the creation of data videos with narration-animationinterplay.

WonderFlow: Narration-Centric Design of Animated Data Videos