TTMSFNCGanttChart – How to shorten/“zoom-out” bar length when switching Timeline Unit (Day → Week → Month → Year)?

FNC TMS FNC Gantt Chart
1

Hello TMS Support Team,

I'm using the TMS FNC Gantt Chart and have a question about changing the timeline scale.

Goal
When I change the timeline from Day → Week → Month → Year, I’d like the visible length of the Gantt bars to become progressively shorter (i.e., effectively “zoom out” so the overall schedule fits more compactly on screen).

Reproduction steps (using your demo):

  1. Open Demos\Gantt Chart\Timeline Options and run it.
  2. In the right pane, switch Timeline → Unit from Day to Year (and/or switch Timeline Group → Unit from Week to Year).
  3. Observe the bar lengths.

Actual result
Even after switching the Timeline Unit (and/or Timeline Group Unit), the displayed bar lengths do not change. The bars appear the same length as before, so I can’t get a compact overview.

Expected / desired behavior
As I move to coarser units (Week/Month/Year), I expect the chart to zoom out so that each task bar is drawn shorter on screen, allowing me to see more of the schedule at once.

Questions

  • Which property or API should be used to achieve this zoom-out behavior when changing units?
    (e.g., something in TimeLineOptions like TimeLineUnit, TimeLineSpan, a zoom factor, ViewDateStart/End, or an “auto-fit/zoom-to-fit” method?)
  • Is there an example snippet showing the recommended way to shrink the on-screen bar lengths as the timeline unit changes (Day→Week→Month→Year)?
  • In the Timeline Options demo, is there a setting I should toggle (e.g., Auto View) or an additional call I should make after changing the unit to force the chart to re-scale?

Environment

  • Delphi 12 Update 2 (RAD Studio 12.2, 29.0.53982.0329)
  • Windows 11
  • TMS FNC Gantt Chart 1.3.1.0

Attachments

  • Screenshot 1: Timeline Unit = Day
  • Screenshot 2: Timeline Unit = Year
    (Bar lengths look identical in both.)

If you could point me to the correct properties/methods or a minimal code sample to get the progressive shortening/zoom-out effect, I’d greatly appreciate it.

Best regards,

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2

Thank you for your feedback.

For the moment there is no such functionality. You can set the TimeLineUnitWidth in TimeLineAppearance to change th size of the units.

We will have a look at your request and see what is feasable and useful to implement in a future version of the TMS FNC Gantt Chart.