What does the color shading system represent in the Gantt chart? #4
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Question
The Gantt chart uses a distinct color per project, and tasks within each project are rendered as tonal variants (lighter/darker shades) of that project's color. What does the shading convey — is it intentional (e.g. task status, priority, type, progress) or purely aesthetic? The answer determines what the legend must explain.
Resolution
The shading system represents task status — 5 states, all purely tonal variants of the project's base color, with borders/lines available to carry additional per-status differentiation:
Done tasks are always shown (ghost shade provides spatial context for adjacent tasks) and are read-only / frozen once they reach that state — cannot be modified.
Cancelled and won't-do tasks are hidden from the Gantt entirely (no shading needed).
The legend must therefore explain: which color = which project, and what each of the 5 tonal states means.