From Newsgroup: comp.text.tex

Alain Matthes submitted an update to the

tkz-elements

package.

Version: 4.50c 2026-01-25
License: lppl1.3c

Summary description: A Lua library for drawing Euclidean geometry with TikZ or tkz-euclide

Announcement text: ----------------------------------------------------------------------

New in version 4.50c

Introduction of the angle class (experimental), providing a
dedicated object for oriented and non-oriented angles.

Introduction of the list_point class (experimental), a container
for ordered collections of points.

Improvements and fixes across core classes (circle, line, point,
quadrilateral, conic).

New matrix algorithms (gauss_jordan, rank) and rewritten triangle
angle handling.

Ongoing documentation restructuring, with systematic tables of
attributes and methods, cross-referenced throughout the manual.

The new classes angle and list_point are marked as experimental:
their interfaces are stable enough for use, but they are not yet
fully integrated into all parts of the ecosystem.

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From Newsgroup: comp.text.tex

Alain Matthes submitted an update to the

tkz-elements

package.

Version: 5.00c 2026-02-17
License: lppl1.3c

Summary description: A Lua library for drawing Euclidean geometry with TikZ or tkz-euclide

Announcement text: ----------------------------------------------------------------------

Docs:
Major Documentation Restructuring
The documentation is now structured into four coherent parts:

Geometry Core
Algebra and Tools
Lua and Integration
Mathematical and Computational Foundations

This restructuring improves conceptual clarity and clearly separates
geometric theory from implementation details.

New Sections:
Added subsection "Special Characters and Catcodes"
Added new section:
Computational Model and Geometric Engine

Added:

in line - Added method where_on_line.
New Classes
Added class fct (function)
Added class pfct (parametric function)
Standard tables introduced: - F raA functions - PF raA parametric functions
Added class list_point

Changed:

Unified Geometric Position Model

A major harmonization of geometric relation methods has been introduced.
Standardized Return Values

All geometric position methods now consistently return:
"ON", "IN", "OUT"
or relation-specific classifications (e.g. "TANGENT", "DISJOINT", etc.)
Boolean wrappers remain available for backward compatibility.
line: New & Updated Methods

line:position(pt)\ raA Returns "ON" or "OUT".
line:in_out(pt)\ raA Boolean wrapper of position.
line:path(n)\ raA Parameter n is now documented.
circle

circle:position(obj) now accepts generic objects:
Relation names are now consistently uppercase:
point: IN, ON, OUT
line: DISJOINT, TANGENT, INTERSECT
circle: Extended circle--circle classification

triangle:
on_triangle
New Attributes: alpha_ , beta_, gamma_, orientation, cross

angle: Major development and stabilization. - value and deg are
now attributes\ (no longer methods).

path: - path:count() is now documented.
- tkzSetCountFromPath is now documented.
- Improved integration between list_point and path.

New Macros (Graph Support): For fct and pfct:

\tkzDrawPointOnGraph
\tkzDrawPointsOnGraph
\tkzDrawPointOnParamGraph
\tkzDrawPointsOnParamGraph

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From Newsgroup: comp.text.tex

Alain Matthes submitted an update to the

tkz-elements

package.

Version: 5.02c 2026-02-20
License: lppl1.3c

Summary description: A Lua library for drawing Euclidean geometry with TikZ or tkz-euclide

Announcement text: ----------------------------------------------------------------------

Added

- path Method 'scale' Anisotropic scaling

- fct Added half_tangents and tangent methods.
Tangents now return unit direction points (no line objects).
Fully compatible with set_scale.
Unified implementation based on drawing coordinates.


Changed

- path homothety now center is optional

- fct et pfct

Removed graph-related drawing macros (\tkzDrawPointOnGraph,
\tkzDrawPointsOnGraph, \tkzDrawPointOnParamGraph, \tkzDrawPointsOnParamGraph).
These were incompatible with set_scale and contradicted the
Lua-computation / TikZ-drawing design principle.

- tkz-elements.sty
Deletions and corrections.

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From Newsgroup: comp.text.tex

Alain Matthes submitted an update to the

tkz-elements

package.

Version: 5.03c 2026-03-04
License: lppl1.3c

Summary description: A Lua library for drawing Euclidean geometry with TikZ or tkz-euclide

Announcement text: ----------------------------------------------------------------------

## [2026/03/04 rCo version 5.03c]

### Changed

- **path**
- `add_point` now accepts either a `point` object or a string
representing coordinates (e.g. `"(2,3)"`, `"(1e-5,0)"`).
- String arguments are automatically parsed using
`utils.parse_point`.
- Improves API flexibility while preserving internal
TikZ-formatted storage.

- **utils**
- Clarified and documented support for scientific notation
in `parse_point` (e.g. `1e-5`, `2E3`).
- Improved documentation of `format_number`,
`checknumber`, and `to_decimal_string`.
- Reinforced consistent fixed-decimal formatting
for TikZ output.

- **tkz-elements.sty**
- Removed the `tkzelements` environment.

- **point**
- Unified approximate equality and geometric identity.
- `__eq` now uses the same Euclidean proximity criterion as `identity`.
- Removed coordinate-wise comparison in favor of a rotation-invariant
distance test.
- Centralized comparison logic for improved numerical consistency.

- **triangle**
- Added `radical_circle`: the circle orthogonal to the three excentral circles.
- Added `the_apollonius_center` and `the_apollonius_circle`.
- `triangle.feuerbach` is now defined as `triangle.euler_circle()`.

### Documentation

- Improved documentation of `\tkzDrawCoordinates`.
- Explained its direct mapping to TikZ `plot coordinates`.
- Clarified that a Lua `path` is a discrete computational object
rendered as an explicit polygonal chain.
- Emphasized the design principle:

*Lua computes rCo TikZ draws.*

- Clarified terminology:
- **mediator** refers to the **perpendicular bisector** of a segment.

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From Newsgroup: comp.text.tex

Alain Matthes submitted an update to the

tkz-elements

package.

Version number: 5.04c 2026-03-11
License type: lppl1.3c

Summary description: A Lua library for drawing Euclidean geometry with TikZ or tkz-euclide

Announcement text: ----------------------------------------------------------------------


## [2026/03/11 rCo version 5.04c]

### Added

- **triangle**
- Added new attributes: `ma`, `mb`, `mc`, `ha`, `hb`, `hc`, `ia`, `ib`, `ic`
- `ma`, `mb`, `mc`: midpoints of the sides
- `ha`, `hb`, `hc`: feet of the altitudes
- `ia`, `ib`, `ic`: feet of the internal angle bisectors

- Added method: `triangle:reflections(pt)`

### Changed

- **triangle**
- Renamed method: `projection(pt)` -> `projections(pt)`

### Notes
- **triangle**
- `projections(pt)` and `reflections(pt)` apply to an arbitrary point.
- `projection()` and `reflection()` apply to the triangle vertices.


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From Newsgroup: comp.text.tex

Alain Matthes submitted an update to the
tkz-elements
package.
Version: 5.05c 2026-03-14
License: lppl1.3c
Summary description: A Lua library for drawing Euclidean geometry with TikZ or tkz-euclide
Announcement text: ----------------------------------------------------------------------
## [2026/03/14 rCo version 5.05c]
### Added
- **triangle**
- methods `isotomic`, `complement`, `anticomplement`
- function triangle:ellipse_inscribed({brianchon/center/focus})
- function triangle:cevian_point(p, q, eps)
- **conics**
- function EL_five_points(z1,z2,z3,z4,z5)
### Documentation
- **conic**
- documentation clarification about constructor usage and helper functions ----------------------------------------------------------------------
The packagerCOs Catalogue entry can be viewed at
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Thanks for the upload.
For the CTAN Team
Vincent Goulet ----------------------------------------------------------------------
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From Newsgroup: comp.text.tex

Alain Matthes submitted an update to the

tkz-elements

package.

Version: 5.06c 2026-04-11
License: lppl1.3c

Summary description: A Lua library for drawing Euclidean geometry with TikZ or tkz-euclide

Announcement text: ----------------------------------------------------------------------

Changed
- triangle
- Changed the order of returned points for `reflections`
and `projections`: (1 raA pa, 2 raA pb, 3 raA pc).
- Added methods returning directly the vertices of special
triangles:
- `orthic_points()`
- `medial_points()`
- `tangential_points()`
- circle
- Modification of the `point` method.
Added an optional point parameter to specify the
reference point on the circle.

Documentation
- Reorganized the method descriptions in the **point** class,
especially for utility methods and the `rotation` method.
- Fixed an incorrect example of the `PPP` method in the
**point** class.
- Section 16.4.1 (Parabola construction):
corrected `bisector of angle HMF` (instead of `angle HFT`).
- Section 7.3 (Use of Trilinear Coordinates):
corrected `projection` raA `projections` in the code.
Thanks to :SwiftWu for these remarks.
- Added documentation for the `print` method.

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