1.0.0
1.0.0 2026-10
**Bug Fixes**
* Recognise element fields named by isotope mass number (Sr88, Y89,
La139, Ce140, Pr141, Nd146, 88Sr, Sr_88, Sr88_ppm ...), preferring the
most abundant isotope when several are present
* Never treat normalised, ratio, error or detection-limit fields
(Sr_ChondriteNorm, La_N, Y_2SE, Nb_LOD ...) as a raw element
concentration; they could previously be picked up in place of the real
field and give wrong Sr/Y, sum LREE, etc.
* Winchester & Floyd (1977) diagram now plots Zr/TiO2 with both terms
in ppm (TiO2 wt pct x 10000, or Ti ppm x 1.6685 when only Ti is
available); a measured TiO2 (or Ti, for Zr/Ti diagrams) field is
preferred over a converted one
* Fix Custom Ternary plots drawing data towards the wrong apexes:
values for A (top), B (bottom-left) and C (bottom-right) now plot
towards their own labelled apex
* Fix chemical formulas in plot titles and axis labels (e.g. TiO2
shown with a square): formula digits (TiO2, SiO2, Na2O, Al2O3 ...) are
now drawn as subscripts
* Remove the "(both in ppm)" suffix from the Zr/Ti vs Nb/Y diagram
(Pearce 1996) ratio axis label; the Zr/TiO2 vs Nb/Y diagram
(Winchester & Floyd 1977) keeps a "(in ppm)" qualifier to avoid
ambiguity with Ti expressed in ppm
* Fix the automatic selected-on-top map rendering order (is_selected()
ascending), which was silently not applied; it is now set as soon as a
layer is chosen in the plugin and restored after any symbology change,
keeping any existing rendering order as a secondary sort
* Points selected on the map are now drawn above all unselected points
on scatter-type plots, so they stay visible in densely clustered data
* Fix selecting points (on a plot or on the map) sometimes drawing a
huge, wrongly-placed copy of the selected symbols on the plot instead
of a normal-sized highlight: the highlight copies weren't marked with
their own transform, so Matplotlib defaulted them to one meant for
data coordinates rather than for the tiny marker shape itself
* The rubber-band selection tool no longer caches/blits its own
background, avoiding a separate glitch where it could go stale and get
redrawn over the plot's actual current state
* Recognise FeOT/Fe2O3T ("total iron") fields - FeOT, FeOt, FeO*,
FeOtot, FeO-tot, FeO(T), FeO(t) and the equivalent Fe2O3 forms - as
FeO/Fe2O3: a dataset reporting only FeOT (no separate FeO) previously
had FeO flagged as missing; a real FeO/Fe2O3 field, when also present,
still takes priority over its FeOT/Fe2O3T counterpart
* New "FeO-T"/"Fe2O3-T" entries in the Custom XY/Ternary and bubble
"Size by" dropdowns, for reading the total-iron field specifically
(any of the spellings above) even when a separate, non-total FeO/Fe2O3
field is also present
* Fix the Custom XY/Ternary Num/Denom tick lists starting with an
entry pre-ticked (and refusing to let it be deselected on its own) and
sometimes toggling an entry just from clicking to open the list; they
now start empty and only toggle an entry on a deliberate click.
Num/Denom can be left blank - a blank Denom is treated as no
denominator (as "1 (none)" already was), while Generate Plot now asks
for the missing X/Y (or A/B/C, on Custom Ternary) fields if a Num list
is left empty
* Custom XY and Custom Ternary: rename "Show all numeric fields" to
"Show all numeric fields (including data different from
concentrations)"
* Fix plots (notably the apatite Sr/Y vs sum LREE diagram) reading the
wrong field for an element when the layer also holds ratio or
coordinate columns: a precomputed ratio such as Sr_Y could be read as
Sr and a Y_UTM coordinate as Y. Ratio/anomaly fields (Sr_Y, Sr/Y,
Sm_Nd, Eu_Eu* ...) are never read as concentrations, Symbol_Fullname
fields must use the element's real name, isotope fields (Sr88, Y89)
take precedence over other Symbol_word fields, and the fields used for
each plot are listed in the QGIS Log Messages panel
* Custom XY and Custom Ternary: Numerator/Denominator lists are now
tick lists; several ticked entries are added together (e.g. Na2O +
K2O), with built-in oxides/elements and unit-suffixed layer fields
converted to a common unit, and a warning when the units of the added
entries can't be reconciled; the bubble Size by list works the same
way on every tab (summed sizes are also exported to/imported from the
map's data-defined size) and on the Spider, Discrimination and
Minerals tabs lists the layer's numeric fields instead of accepting a
typed field name; drop-down lists open wide enough to show every entry
in full
* Category sample counts in plot legends and the style panel now read
n=x/y (x plotted out of y selected samples in the category, as samples
missing a required variable are not plotted); Discrimination and
Minerals legends now show these counts, and the Spider diagram title
counts only samples actually drawn

**Improvements**
* Rename the Minerals-tab apatite scheme to "Apatite - Sr/Y vs sum
LREE (La+Ce+Pr+Nd) - O'Sullivan et al. (2020)"
* Select Samples list shows each category once (with its sample count)
instead of repeating it for every sample; selecting a category selects
all of its samples
* Features selected on the QGIS map are now highlighted on every open
plot (map to plot selection, as well as plot to map)
* Style panel in the plot window can now be collapsed/expanded with a
button, docked to any side of the plot window (or floated), and
resized by dragging the bars between it and the plot and between its
Categories and Legend sections
* Each section of the style panel (Statistics, Style Management,
Categories, Legend) can be collapsed/expanded by clicking its header
* The options on every tab of the main plugin window are now grouped
into collapsible sections, each with a drag bar to resize it
(double-click to reset)
* Layer Selection, Plot Options (the tabs) and Samples are now
collapsible groups separated by two draggable bars, and the window
automatically re-fits (giving spare height to the Samples list) when
groups or sections are collapsed/expanded or the tab changes
* Apply the selected-on-top layer rendering order (is_selected()) when
plotting from the Spider tab as well
* Add opt-in "Use layer symbology" option: take each category's
colour, marker shape, size and label from the layer's Categorized
symbology when it classifies on the selected Category field
(map-unchecked categories start hidden; unstyled categories keep the
default plot styling); also available as a toggle button in the plot
style panel (Style Management) to restyle an open plot live (click
again to restore the default styles); a data-defined symbol size on
the layer fills in the tab's Bubble Size settings
* Add "Apply to layer..." button to the plot style panel, building a
Categorized symbology for the layer from the plot's category styles
(with confirmation; the previous layer style is kept in the layer's
style list); bubble sizing is exported as a matching data-defined
symbol size
* Add median and interquartile range (IQR) to the style panel's
Statistics section, with two new checkboxes alongside Show mean +/- 2
sigma, which can be combined freely: the median is an open ring around
the category's symbol (dashed trace on spider diagrams) and the IQR an
unfilled box from the 25th to the 75th percentile on both axes (shaded
band on spider diagrams, computed in log10 space like the mean); a new
Show faded individual data checkbox (ticked by default) hides the
faint points/lines behind the statistics
* Layer Selection: the layer selected in the QGIS Layers panel is now
preselected if it's suitable for the plugin, and followed while the
plugin is open; the Category and Add label lists show field aliases as
"alias (fieldname)" when defined
* Custom Ternary: the three apexes can now use a Linear or Log scale
(log10, or log10(1 + value) when a plotted value is below 1, as shown
in the apex labels). Plot Options: Bubble Size is now the last section
on every tab, and Axis Scales and Display follows the field
definitions on Custom XY and Custom Ternary
* Samples: all samples are selected by default when the layer has no
QGIS selection, and the list now follows map selections by itself.
Rows ticked in the list now select those samples on the map and on
open plots, and the All button is a true all (it also clears any QGIS
selection). New Copy Table and Copy Labels buttons copy the selected
samples to the clipboard, and a Selections list with back/forward
buttons recalls earlier selections, which can be saved with a name and
notes (stored with the layer in the QGIS project)
* Plots: new freehand area selection (as in Stereoplot) alongside the
rectangle, now also on Spider diagrams, chosen in the Style panel's
Selection section; an Add to selection option combines several zones
without holding Shift. Fix a Shift-drag also toggling the nearest
point and making the following click ignored
* Custom XY and Custom Ternary: Num and Denom lists are now the same
width, and a menu next to each one clears the ticked entries or saves
them under a name for later use, in any project
* Plots: new Copy PNG button in the plot window's toolbar, copying the
whole plot with its markers and legends to the clipboard as a 300 dpi
image. The Save... button of the plugin window is removed: plots are
saved from the plot window's toolbar
* Spider tab: new "Add lambda0-lambda4 to Layer (selected samples)"
button writing the REE shape coefficients of O'Neill (2016, J.
Petrology 57, 1463-1508) to the layer fields lambda0-lambda4, using
the paper's CI chondrite abundances, Shannon ionic radii and
orthogonal polynomials (Eu excluded; at least 6 REE including one of
La-Nd and one of Er-Lu needed)

**Dependencies & QGIS 4 (Qt6)**
* requirements.txt now declares minimum versions only, harmonised with
the GEOL-QMAPS and Stereoplot plugins (numpy>=1.21 ; matplotlib>=3.5).
The previous upper caps (numpy<2.0, matplotlib<3.12) conflicted with
the numpy 2.x that QGIS 3.44 and QGIS 4 ship, making qpip install an
older duplicate numpy that shadows QGIS's own (which can break QGIS's
GDAL bindings). The floors are the oldest versions the plugin actually
needs (matplotlib 3.5 is the first with the QtAgg backend used under
Qt6), so qpip never replaces the packages QGIS ships.
* Set plugin_dependencies=qpip (as GEOL-QMAPS already does), so the
QGIS Plugin Manager offers to install qpip, which installs the
requirements.txt dependencies, together with the plugin.
* The map-to-plot selection highlight now also works with matplotlib
3.5 (it used a keyword only available from matplotlib 3.6).
* Checked QGIS 4 readiness: QGIS 4 only uses qgisMaximumVersion (4.99)
to decide compatibility, and the supportsQt6 flag is obsolete (removed
from QGIS core), so it stays out of metadata.txt. The unscoped
Qt5-only enum fallbacks (Qt.RightDockWidgetArea, QMessageBox.Ok...)
flagged by the QGIS plugin repository's Qt6 check are removed: only
scoped enums are used, which work with both PyQt6 and the PyQt5 5.15
of QGIS 3. A static check of the code against PyQt6 finds no unscoped
Qt enums left.

0.0.5 2026-07
**Dependency Harmonisation & Qt6 Fixes**
* Declared explicit numpy/matplotlib version ranges in
requirements.txt, harmonised with the GEOL-QMAPS and Stereoplot
plugins (numpy>=1.26.4,<2.0 ; matplotlib>=3.7,<3.12), so installing
all three on the same QGIS Python environment converges on one
mutually compatible dependency set.
* Fixed a bug where a missing matplotlib installation crashed at
import time instead of degrading gracefully (an unconditional
matplotlib.colors import sat outside the intended try/except guard).
* Fixed a Qt6/QGIS4 compatibility bug: QAction is now imported with a
Qt5/Qt6-safe fallback (previously imported only from QtWidgets, which
raises ImportError under Qt6 since QAction moved to QtGui).
* Added the supportsQt6=True declaration to this file, now that
Qt6/QGIS4 compatibility has been verified.
* Fixed a copy-paste error in the README that referred to this plugin
as "GEOL-QMAPS" in the installation instructions.

**New Features**
* Add Geochemical Differentiation of Sedimentary Rocks ternary diagram
(Hasterok et al. 2018, after Mason 1966), with a first-screening check
for required oxide fields and a below-detection-limit (negative value)
handling option
* Add category mean +/- 2 sigma statistics overlay (all plot tabs),
toggled live from the interactive style panel: shows each category's
mean +/- 2 sigma with individual samples faded behind it, or replaced
by a semi-transparent contour-less envelope, with adjustable
background opacity and error bar/marker thickness; the mean marker
follows bubble sizing when active and stays in sync with the
category's colour/marker
* Add per-category drawing (z-stack) order control to the interactive
style panel
* Add hollow/full symbol fill option (white fill, coloured outline) to
the interactive style panel
* Add interactive per-category style panel (colour, marker, size,
transparency) with save/load/reset/delete templates, replacing the old
style JSON file
* Add "no category" option to plot all points with a single symbol
* Add bubble plots: scale symbol size by a chosen field (linear, log10
or exponential scaling), available for every plot type
* Add Filter Layer to Selected / Clear Filter buttons to turn a plot
selection into a QGIS layer filter
* Fix Ti vs Zr (Pearce & Cann 1973) diagram and add automatic
ppm/ppb/wt pct/oxide unit conversion across all plots
* Recognise many more elements and oxides in Custom XY plots
* Add Data Preprocessing sub-tab to Custom XY for
below-detection-limit (negative value) handling, with substitution
options and a review/histogram tool
* Add plot-type dropdown to the Minerals tab, ready for future
classification schemes
* Improve point label readability (white background) and stacking
order (always drawn above points)
* Various dock panel usability fixes: horizontal scrolling, tabs
resize to content, tighter control alignment

0.0.4
* Allow selection of plotted points to update map selections
* Assign field labels to points
* Add labels to selected points in plots
* Allow symbol choices to be saved to and read from file
* Add popup label when cursor near a point
* Selected points plot ontop on map layer
* Custom triangle plot added
* Add Sullivan 2020 Apatite classification
* Add density vs magnetic susceptibility plot

0.0.3
* Add Winchester & Floyd 1977 plot
* Allow any numeric field for Custom xy plots
* Allow field names with Na_Sodium naming convention

0.0.2
* Fix QT6 issues for QGIS 4

0.0.1 - Initial release
* Spider diagrams with multiple normalization options
* 7 discrimination diagrams
* Custom XY plotting with REE normalization

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