One class of toolkits supports either interaction or animation, but not both. Unfortunately, existing visualization toolkits can present a highly viscous specification process when navigating this time-space trade-off. ĭespite these differences, the designs express a shared goal - to visualize different groupings of the data - and a visualization author might reasonably expect to be able to easily move between the three to make the most appropriate choice. These designs make different trade-offs between time and space and, as a result, research results suggest they afford readers different levels of clarity, time commitment, and visual interest. However, consider the friction of visualizing faceted data: an author might choose between depicting facets as a small multiples display, on-demand via interaction (e.g., dynamic query widgets), or played sequentially via animation. When making an explanatory graphic, rapid prototyping allows a visualization author to evaluate candidate designs before committing to refining one in detail.įor exploratory data analysis, rapid prototyping is equally key as visualization is just one part of a broader workflow, with analysts focused on producing and analyzing a chart to yield insight or seed further analysis. Rapid prototyping is critical to the visualization authoring process. These reflections highlight the key motivating role of in-the-wild examples, and identify three central tradeoffs: the language design process, the types of animated transitions supported, and how the systems model keyframes. We also critically reflect on the conceptual affordances and limitations of our contribution by interviewing five expert developers of existing animation grammars. We evaluate the expressiveness of our approach through a gallery of diverse examples that demonstrate coverage over taxonomies of both interaction and animation.
To compose animation and interaction, we also represent time as an event stream Vega-Lite selections, which provide dynamic data queries, are now driven not only by input events but by timer ticks as well. Time encodings map a data field to animation keyframes, providing a lightweight specification for animations without interaction. Thus, to compose animation with static visualizations, we represent time as an encoding channel. In contrast to alternate approaches for specifying animated visualizations, which prize a highly expressive design space, Animated Vega-Lite prioritizes unifying animation with the language’s existing abstractions for static and interactive visualizations to enable authors to smoothly move between or combine these modalities.
We present Animated Vega-Lite, a set of extensions to Vega-Lite that model animated visualizations as time-varying data queries. IEEE Transactions on Visualization & Computer Graphics (Proc.
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