Changelog

1.0.1

Ported from SPC Chart 2.4.0.

New Features:

• Variable limits from a reference query: A control line positioned from a Series can now follow a limit that changes over time. When the reference query returns one value per plotted point and those values differ, the line is drawn stepped instead of flat — the same rendering the attribute charts use for their per-point control limits. A reference query holding a single value, or the same value repeated, still draws a constant line.

Bug Fixes:

• Feature queries are selectable again, and behave like reference data: The "Feature queries" option, which marks queries as reference-only, was never registered in the panel editor — it could only be set by hand-editing the panel JSON. It now appears in the SPC section. A feature query is also properly consumed as a reference now: it is drawn only through the control lines that read it, in the color configured on the line, instead of being plotted as an extra series with its own palette color and points, and the chart type transform no longer runs over specification values.
• Fill regions follow a variable limit: The shaded region attached to a control line was drawn as a flat band at the line's first value, so on a variable (stepped) limit the line moved but its fill did not. The region now steps with the line.
• Series-positioned control lines take the first reference value, not the last: A control line reading its position from a reference query used that query's last row, so the limit drifted whenever a row was appended. Reference queries are lookups, so the first value is used. Single-row lookups — by far the common case — are unaffected.
• Numeric X-axis works whatever order the queries come back in: The X field was located by looking up its name in the first query only, and the resulting column index was then applied to every other query by position. A panel whose first query did not carry the X column — a specification-limit lookup, say — silently fell back to a time axis and charted the X column as though it were a measurement; and queries that returned their columns in different orders had the wrong column treated as the X axis. The X field is now matched by name in each query independently.

1.0.0 (2026-07-29)

Initial SPC Chart PRO release, forked from SPC Chart v2.4.0.

• All SPC Chart features: XmR, Xbar-R, Xbar-S control charts, custom control lines, capability statistics (Cp/Cpk/Pp/Ppk), statistics table, CSV export, annotations, numeric X-axis.
• Run rules — Nelson rules 1–8 with per-chart applicability, severity-coloured violation markers, tooltip detail and a CSV section.
• Attribute charts — p, np, c, u, Laney p′/u′.
• Time-weighted charts — CUSUM and EWMA, with optional historical mean/σ.
• Between/within charts — I-MR-R/S.
• Short-run charts — Z-MR and DNOM.
• Point exclusion (omit-from-estimation) and staged control limits.