98 lines
3.6 KiB
EmacsLisp
98 lines
3.6 KiB
EmacsLisp
;;; cg-render.el --- Renderer "skins" for card games -*- lexical-binding: t; -*-
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;; Copyright (C) 2026 Corwin Brust
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;; Author: Corwin Brust <corwin@bru.st>
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;; Maintainer: Corwin Brust <corwin@bru.st>
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;; Version: 1.0.50
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;; Package-Requires: ((emacs "26.1"))
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;; Keywords: games
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;; URL: https://code.bru.st/corwin/card-game.el
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Concrete display treatments ("skins") built on the `cg-renderer'
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;; protocol from cg-core. Each treatment is a small EIEIO class that
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;; registers itself by name:
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;;
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;; text plain UNICODE text (works in a terminal and on Android)
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;; svg SVG cards on a graphical display
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;; svg-fill a full-window SVG table that grows with the window
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;;
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;; A game draws itself by calling `cg-render-game', which selects the
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;; game's current renderer (falling back to a default treatment chosen
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;; for the display) and dispatches `cg-renderer-draw'. The actual,
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;; game-specific drawing is supplied as methods specialised on a
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;; (TREATMENT GAME) pair in the individual game files.
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;;; Code:
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(require 'cg-core)
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(defgroup cg-render nil
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"Display treatments (\"skins\") for card games."
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:group 'card-games
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:prefix "cg-render-")
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(defclass cg-text-renderer (cg-renderer)
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((name :initform 'text))
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"Plain UNICODE text treatment.")
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(defclass cg-svg-renderer (cg-renderer)
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((name :initform 'svg))
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"SVG cards on a graphical display.")
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(defclass cg-svg-fill-renderer (cg-svg-renderer)
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((name :initform 'svg-fill))
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"Full-window SVG table that grows to fill the window.")
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(cg-register-renderer 'text 'cg-text-renderer)
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(cg-register-renderer 'svg 'cg-svg-renderer)
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(cg-register-renderer 'svg-fill 'cg-svg-fill-renderer)
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(defcustom cg-render-default-treatment 'auto
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"Default display treatment for games.
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The value `auto' chooses `svg' on a graphical display and `text'
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otherwise. It may instead name a treatment registered in
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`cg-renderers', such as `text', `svg', or `svg-fill'."
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:type '(choice (const :tag "Automatic (svg if graphical, else text)" auto)
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(const text) (const svg) (const svg-fill)
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(symbol :tag "Other registered treatment"))
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:group 'cg-render)
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(defun cg-render-resolve-treatment (&optional name)
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"Return a concrete treatment name, resolving `auto' and NAME for this display.
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NAME defaults to `cg-render-default-treatment'."
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(let ((n (or name cg-render-default-treatment)))
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(if (eq n 'auto)
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(if (display-graphic-p) 'svg 'text)
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n)))
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(defun cg-render-game (game)
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"Draw GAME with its current renderer, creating a default one if needed.
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The default treatment comes from `cg-render-resolve-treatment'."
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(let ((r (or (oref game renderer)
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(let ((new (cg-make-renderer (cg-render-resolve-treatment))))
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(oset game renderer new)
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new))))
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(cg-renderer-draw r game)))
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(defun cg-render-set-treatment (game name)
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"Switch GAME to the treatment NAME and return its new renderer."
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(oset game renderer (cg-make-renderer name)))
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(provide 'cg-render)
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;;; cg-render.el ends here
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