Construction Gantt Chart Generator

Problem to solve

Project schedules often involve complex task hierarchy, unclear predecessor relationships, and hard-to-verify critical paths. Construction schedules are especially tricky because work is usually organized by division → sub-division → item-level task, and the final chart needs to be printable, reviewable, and consistent with plan dates. Manual charting tends to break down when tasks multiply: dates shift, critical paths are missed, and paginated prints fragment.

How it works and limits

• Input: users provide task data organized according to docs/reference.md, including project name, start date, task hierarchy, duration, and predecessor links.
• Detection: for construction projects, it reads docs/building-engineering-logic.md and loads reference material in resources/Building Engineering Resources.md, based on GB50300-2013.
• Generation: the script scripts/generate_gantt.py computes the CPM critical path and produces A4 landscape paginated PNG files plus an Excel Gantt table with bars; it relies on matplotlib, networkx, Pillow, and openpyxl.
• Limits: input JSON must match the required fields; the construction reference is auxiliary and does not replace code review; missing task levels, durations, or predecessor data will significantly reduce chart usability.