201 lines
8.3 KiB
Common Lisp
201 lines
8.3 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.TILED
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;;;; Import a Tiled-format (TMX) map into the hash-table/plist/alist format
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;;;; used by the overworld.
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(defpackage :flora-search-aurora.overworld.tiled
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(:nicknames :fsa.o.t :overworld.tiled :🌍.🀨)
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(:use :cl
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:flora-search-aurora.overworld.util)
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(:export #:load-map))
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(in-package :flora-search-aurora.overworld.tiled)
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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 KEY-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 built upon GROUPS.
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If NIL is returned from KEY-FUNCTION, the given item is thrown out."
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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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(when key
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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 tiled-coords->world-coords (x y tiled-map)
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"Given X & Y coordinates with a parsed Tiled map, return the appropriate
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character-scale world coordinates in plist form."
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(list :x (floor (/ x (cl-tiled:map-tile-width tiled-map)))
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:y (floor (/ y (cl-tiled:map-tile-height tiled-map)))))
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;;; ———————————————————————————————————
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;;; Object-layer (Persons/Triggers)
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;;; ———————————————————————————————————
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(defun tiled-rectangle-p (tiled-obj)
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"Whether or not a Tiled object is a valid rectangle."
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(and (> (cl-tiled:rect-width tiled-obj) 0)
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(> (cl-tiled:rect-height tiled-obj) 0)))
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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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(when (not (tiled-rectangle-p tiled-obj))
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(let ((properties (cl-tiled:properties tiled-obj)))
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(append
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(list (string->symbol (gethash "id" properties)))
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(loop for key being the hash-keys in properties
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for val being the hash-values in properties
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collect (intern (string-upcase key) "KEYWORD")
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collect val)
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(list
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:face (gethash "normal-face" properties)
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:coords (tiled-coords->world-coords (cl-tiled:object-x tiled-obj)
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(cl-tiled:object-y tiled-obj)
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tiled-map))))))
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(defun tiled-object->trigger (tiled-obj tiled-map)
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"Convert a Tiled object into a “trigger” plist. That is, a rectangle with
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a :FUNCTION to be triggered when it’s stepped upon."
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(when (tiled-rectangle-p tiled-obj)
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(let ((obj-x (cl-tiled:object-x tiled-obj))
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(obj-y (cl-tiled:object-y tiled-obj))
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(obj-width (cl-tiled:rect-width tiled-obj))
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(obj-height (cl-tiled:rect-height tiled-obj)))
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(list
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:coords (tiled-coords->world-coords obj-x obj-y tiled-map)
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:width obj-width
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:height obj-height
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:bottom-coords (tiled-coords->world-coords (+ obj-x obj-width) (+ obj-y obj-height) tiled-map)
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:function (gethash "function" (cl-tiled:properties tiled-obj))))))
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(defun object-layer-entities (layer &optional (entity-chunks '()))
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"Convert all point objects in an object layer into entity plists."
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(let ((entities (mapcar (lambda (object) (tiled-object->entity object (cl-tiled:layer-map layer)))
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(layer-objects layer))))
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(collect-items-into-groups
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entities
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(lambda (entity)
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(when entity
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(world-coords-chunk (getf (cdr entity) :coords))))
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:groups entity-chunks)))
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(defun object-layer-triggers (layer &optional (trigger-chunks '()))
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"Convert all rectangle objects in an object layer into trigger plists."
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(let ((triggers (mapcar (lambda (object) (tiled-object->trigger object (cl-tiled:layer-map layer)))
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(layer-objects layer))))
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(collect-items-into-groups
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triggers
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(lambda (trigger)
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(when trigger
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(world-coords-chunk (getf trigger :coords))))
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:groups trigger-chunks)))
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;;; ———————————————————————————————————
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;;; Tile-layer parsing (graphics)
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;;; ———————————————————————————————————
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(defun tiled-cell->cell (tiled-cell &key (language nil))
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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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:lang language))
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(defun tiled-layer-cells (layer)
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"Given a Tiled layer, return all of its cells in our custom cell plist-format."
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(let ((layer-lang
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(…:langcode->keysym
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(gethash "language" (cl-tiled:properties layer)))))
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(mapcar (lambda (tiled-cell)
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(tiled-cell->cell tiled-cell :language layer-lang))
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(cl-tiled:layer-cells layer))))
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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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(collect-items-into-groups
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(tiled-layer-cells layer)
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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 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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;;; 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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(top-tiles '())
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(bump-map '())
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(entities '())
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(triggers '())
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(hash (make-hash-table)))
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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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;; Add to the bump-map if the layer is colliding
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(when (gethash "colliding" (cl-tiled:properties layer))
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(setf bump-map (tile-layer-chunks layer bump-map)))
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(if (gethash "top-layer" (cl-tiled:properties layer))
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(setf top-tiles (tile-layer-chunks layer top-tiles))
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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 triggers (object-layer-triggers layer triggers))
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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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(setf (gethash :tiles hash) tile-chunks)
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(setf (gethash :top-tiles hash) top-tiles)
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(setf (gethash :bump-map hash) bump-map)
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(setf (gethash :entities hash) entities)
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(setf (gethash :triggers hash) triggers)
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hash))
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