The glide (Graph Layout Interactive Diagram Editor) system (first presented at GD’96) improves on general constraint-based approaches to drawing and layout by supporting only a small set of “macro” constraints, known as VOFs (visual organization features). They are specifically suited to graph drawing, contributing both aesthetic and semantic information. To date, glide remains the only interactive graph drawing tool to support the use of VOFs or similar constructs. More recent work  has begun to investigate the importance of visual organization in graph drawing.
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