[ANN] Guile-PNG 0.7.1 released

[Artyom V. Poptsov]

Hello Guilers,

I'm pleased to announce Guile-PNG 0.7.1, Portable Network Graphics
(PNG)[1] library for GNU Guile, implemented in pure scheme:
  https://github.com/artyom-poptsov/guile-png/releases/tag/v0.7.1

This release fixes some bugs, expands the library of graphic types and
procedures, and adds new examples of Guile-PNG usage.  Namely there's
now "Sierpinski Carpet Animation" example that allows to generate a
sequence of images that can be latter joined together into a video/GIF
animation of Sierpinski Carpet infinite zoom.  Please see the attached
GIF animation as an example.

sierpinski-carpet-animation.gif
Description: GIF image

* List of user-visible changes

--8<---------------cut here---------------start------------->8---
* Changes in version 0.7.1 (2023-08-20)
** Fix Bresenham's Line generation algorithm                         :BUGFIX:
Bresenham's Line generation algorithm would fail to draw properly some types
of inclined lines.  Now that is fixed.
** Fix the order of building Guile-PNG FSM modules                   :BUGFIX:
The building process would fail during =make distcheck=.  Not that is fixed.
** New modules
*** =(png graphics dimension)=
=<dimension>= class represents a dimension with width and height as
properties.
*** =(png graphics selection)=
=<selection>= class represents a selected part of an image.  The selected part
has only =selection-crop= method for now, that allows to get a part of the
base image as a new image.
** Add class printers for graphic objects
Classes from =(png graphics)= are now have proper class printers.
** Add new examples
New examples added:
- Sierpinski Triangle
- Sierpinski Carpet
- Sierpinski Carpet Animation
--8<---------------cut here---------------end--------------->8---


Happy hacking!

- avp


References:
1. https://www.rfc-editor.org/rfc/rfc2083

-- 
Artyom "avp" Poptsov <poptsov.artyom@gmail.com>
Home page: https://memory-heap.org/~avp/
CADR Hackerspace co-founder: https://cadrspace.ru/
GPG: D0C2 EAC1 3310 822D 98DE  B57C E9C5 A2D9 0898 A02F

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