VISTA: Structure-Aware Training-Free Editable Diagram Generation from Natural Language

Dongqi Han, Bojie Lin, Junhan Wang, Jiefu Luo


Abstract
Editable diagram generation from natural language requires structural correctness and visual readability. Text-to-image models produce rasters with no editable objects. LLM code-generation approaches yield editable output but face three challenges: unreliable geometry from token-by-token coordinate emission, shallow verification that checks code rather than the rendered image, and dependence on task-specific fine-tuning. We present VISTA, a training-free pipeline that assigns each subproblem to the appropriate component: an LLM extracts semantic structure, a deterministic algorithm computes all geometry, and a VLM inspects the rendered diagram jointly with its source and issues localized repairs. We construct a 150-prompt benchmark from PNG-only references and evaluate against eight baselines including Codex, Claude Code, and a fine-tuned multi-agent system. VISTA achieves the highest readability across all pairwise comparisons. Code and data are available at https://github.com/nice-grp/Vista.
Anthology ID:
2026.emnlp-main.2403
Volume:
Proceedings of the 2026 Conference on Empirical Methods in Natural Language Processing
Month:
October
Year:
2026
Address:
Budapest, Hungary
Editors:
Hung-Yi Lee, Sunipa Dev, Jessy Li, Desmond Elliott
Venue:
EMNLP
SIG:
SIGDAT
Publisher:
Association for Computational Linguistics
Note:
Pages:
54612–54627
Language:
URL:
https://aclanthology.org/2026.emnlp-main.2403/
DOI:
Bibkey:
Cite (ACL):
Dongqi Han, Bojie Lin, Junhan Wang, and Jiefu Luo. 2026. VISTA: Structure-Aware Training-Free Editable Diagram Generation from Natural Language. In Proceedings of the 2026 Conference on Empirical Methods in Natural Language Processing, pages 54612–54627, Budapest, Hungary. Association for Computational Linguistics.
Cite (Informal):
VISTA: Structure-Aware Training-Free Editable Diagram Generation from Natural Language (Han et al., EMNLP 2026)
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PDF:
https://aclanthology.org/2026.emnlp-main.2403.pdf