A layout engine is a software component that applies one or more layout algorithms to a model of visual elements and produces a concrete arrangement ready for rendering. It manages coordinate systems, constraint solving, sizing, and incremental relayout in response to data changes. Layout engines power diagram tools, document renderers, and graphical user interface frameworks.
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- Engines such as Graphviz, ELK, and dagre encapsulate algorithm selection, constraint solving, and edge routing behind a stable API. Performance hinges on incremental relayout and caching so that interactive diagrams remain responsive as the underlying graph evolves.