150 lines
5.9 KiB
Common Lisp
150 lines
5.9 KiB
Common Lisp
;;;; Copyright © 2023, Jaidyn Ann <jadedctrl@posteo.at>
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;;;;
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;;;; This program is free software: you can redistribute it and/or
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;;;; modify it under the terms of the GNU General Public License as
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;;;; published by the Free Software Foundation, either version 3 of
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;;;; the License, or (at your option) any later version.
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;;;;
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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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;;;;
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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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;;;; FLORA-SEARCH-AURORA.OVERWORLD
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;;;; All game-functions and data relating to the “overworld” (that is,
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;;;; the primary gameplay, the RPG-ish-ish bits).
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(defpackage :flora-search-aurora.overworld.tiled
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(:use :cl)
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(:export #:load-map
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#:world-coords-chunk #:world-coords->screen-coords))
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(in-package :flora-search-aurora.overworld.tiled)
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;;; ———————————————————————————————————
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;;; Tiled maps → Map lists
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;;; ———————————————————————————————————
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(defun load-map (map-file)
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"Parse a map-file into an plist of its data. This consists of:
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:BUMP-MAP, an alist of tiles (keyed by chunk) in a “collidable” layer
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:TILES, an alist of visible tiles (keyed by chunk).
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:ENTITIES, a list of entity plists."
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(let ((tile-chunks '())
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(bump-map '())
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(entities '()))
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(mapcar (lambda (layer)
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(typecase layer
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(cl-tiled.data-types:tile-layer
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(when (gethash "colliding" (cl-tiled:properties layer) #'string-equal)
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(setf bump-map (tile-layer-chunks layer bump-map)))
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(setf tile-chunks (tile-layer-chunks layer tile-chunks)))
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(cl-tiled.data-types:object-layer
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(setf entities (object-layer-entities layer entities)))))
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(cl-tiled:map-layers (cl-tiled:load-map map-file)))
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(list :tiles tile-chunks :bump-map bump-map :entities entities)))
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(defun tile-layer-chunks (layer &optional (chunks '()))
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"Given a Tiled tile-layer (that is, graphics of the map), parse it into an
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alist of Tiled cell “chunks”."
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(let ((cells (mapcar #'tiled-cell->cell (cl-tiled:layer-cells layer))))
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(collect-items-into-groups
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cells
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(lambda (cell)
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(world-coords-chunk (getf cell :coords)))
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:groups chunks)))
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(defun object-layer-entities (layer &optional (entities '()))
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"Convert all objects in an object layer into entity plists."
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(append
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entities
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(mapcar
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(lambda (object)
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(tiled-object->entity object
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(cl-tiled:layer-map layer)))
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(layer-objects layer))))
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(defun tiled-object->entity (tiled-obj tiled-map)
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"Convert a Tiled object into an entity plist."
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(let ((properties (cl-tiled:properties tiled-obj)))
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(list (intern (string-upcase (gethash "id" properties #'string-equal)))
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:coords (list :x (floor (/ (cl-tiled:object-x tiled-obj)
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(cl-tiled:map-tile-width tiled-map)))
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:y (floor (/ (cl-tiled:object-y tiled-obj)
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(cl-tiled:map-tile-height tiled-map))))
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:face (gethash "face" properties #'string-equal)
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:direction (if (gethash "facing_right" properties #'string-equal)
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'right
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'left))))
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(defun tiled-cell->cell (tiled-cell)
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"Convert a Tiled cell into a cell plist."
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(list :coords (list :x (cl-tiled:cell-column tiled-cell)
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:y (cl-tiled:cell-row tiled-cell))
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:char (tile-character (cl-tiled:cell-tile tiled-cell))))
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(defun layer-objects (layer)
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"Return all Tiled objects in the given object layer."
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(slot-value layer 'cl-tiled.data-types::objects))
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(defun tile-character (tile)
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"Given a tileset's tile, return it's corresponding text character,
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assuming that the tileset is a bitmap font starting with char-code 32
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with 15 characters-per-line."
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(code-char
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(+ (* (cl-tiled:tile-row tile) 15)
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(cl-tiled:tile-column tile)
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32)))
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;;; ———————————————————————————————————
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;;; Misc. utility
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;;; ———————————————————————————————————
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(defun collect-items-into-groups (list key-function &key (groups '()))
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"Given a LIST of items and a function categorizing an individual item
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(returning a “category” symbol for any given item), return an sorted
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associative list."
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(loop for item in list
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do (let ((key (apply key-function (list item))))
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(setf (assoc-utils:aget groups key)
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(append (assoc-utils:aget groups key)
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(list item)))))
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groups)
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(defun world-coords->screen-coords (world-coords &key (chunk-width 72) (chunk-height 20))
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"Given a set of “world” coordinates, determine where this spot would be on the screen.
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The world is split into screen-sized “chunks” to this end.
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— Chester P. Runk"
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(let* ((chunk-x (floor (/ (getf world-coords :x)
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chunk-width)))
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(chunk-y (floor (/ (getf world-coords :y)
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chunk-height)))
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(x (- (getf world-coords :x) (* chunk-x chunk-width)))
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(y (- (getf world-coords :y) (* chunk-y chunk-height))))
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(list :x x
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:y y
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:chunk (coords->symbol chunk-x chunk-y))))
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(defun world-coords-chunk (coords)
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(getf (world-coords->screen-coords coords) :chunk))
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(defun coords->symbol (x y)
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(intern (format nil "~A,~A" x y)))
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(defun symbol->coords (coords-symbol)
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(str:split #\, (symbol-name coords-symbol)))
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