312 lines
12 KiB
Common Lisp
312 lines
12 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
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(:use :cl
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:flora-search-aurora.input :flora-search-aurora.display
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:flora-search-aurora.ui)
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(:export #:overworld-state #:player))
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(in-package :flora-search-aurora.overworld)
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;;; ———————————————————————————————————
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;;; Overworld loop
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;;; ———————————————————————————————————
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(defun overworld-state
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(matrix &key (map-path nil) (map (load-map map-path)))
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"Render the given map to the matrix and take user-input — for one frame.
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A state-function for use with STATE-LOOP."
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(sleep .02)
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(overworld-state-draw matrix map)
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(overworld-state-update map))
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(defun overworld-state-draw (matrix map)
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"Draw the overworld map to the given matrix.
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A core part of OVERWORLD-STATE."
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(let* ((player-data (cdr (assoc 'PLAYER (getf map :entities))))
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(chunk (world-coords-chunk (getf player-data :coords))))
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(matrix-write-map-chunk matrix map chunk)
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(matrix-write-entities matrix map)))
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(defun overworld-state-update (map)
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"Do nothing, lol. Core part of OVERWORLD-STATE.
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Returns parameters to be used in the next invocation of OVERWORLD-STATE."
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(process-overworld-input map)
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(list :map map))
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;;; ———————————————————————————————————
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;;; Overworld logic
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;;; ———————————————————————————————————
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(defun process-overworld-input (map)
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"Get and process any keyboard input, modifying the map or entities as necessary."
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(if (listen)
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(let* ((input (normalize-char-plist (read-char-plist))))
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(cond
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((plist= input '(:modifier nil :char #\→))
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(move-entity map 'player :x 1))
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((plist= input '(:modifier nil :char #\←))
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(move-entity map 'player :x -1))
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((plist= input '(:modifier nil :char #\↑))
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(move-entity map 'player :y -1))
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((plist= input '(:modifier nil :char #\↓))
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(move-entity map 'player :y 1))))))
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(defun move-entity (map entity &key (x 0) (y 0))
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"Move an entity relative to its current position."
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(let ((entity-plist (cdr (assoc entity (getf map :entities)))))
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(when (< x 0)
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(setf (getf entity-plist :direction) 'left))
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(when (> x 0)
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(setf (getf entity-plist :direction) 'right))
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(move-entity-to map entity
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:x (+ x (getf (getf entity-plist :coords) :x))
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:y (+ y (getf (getf entity-plist :coords) :y)))))
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(defun move-entity-to (map entity &key (x 0) (y 0))
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"Move the given entity to the given coordinates."
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(let ((entity-plist (cdr (assoc entity (getf map :entities)))))
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(when (walkable-tile-p map x y)
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(setf (getf (getf entity-plist :coords) :x) x)
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(setf (getf (getf entity-plist :coords) :y) y))))
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;;; ———————————————————————————————————
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;;; Mapping & map-rendering
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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.)
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At the moment, this consists solely of :TILE-CHUNKS, all visible cells sorted
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into an alist by their “chunk” on the map."
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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 (tiled-tile-layer-chunks layer bump-map)))
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(setf tile-chunks (tiled-tile-layer-chunks layer tile-chunks)))
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(cl-tiled.data-types:object-layer
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(setf entities (tiled-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 tiled-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 tiled-object-layer-entities (layer &optional (entities '()))
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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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(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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(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 (tiled-tile-character (cl-tiled:cell-tile tiled-cell))))
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(defun matrix-write-map-chunk (matrix map chunk
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&key (chunk-width 72) (chunk-height 20))
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"Draw a map’s specific chunk (by its ID) to the matrix."
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(mapcar (lambda (cell)
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(matrix-write-cell matrix cell))
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(cdr (assoc chunk (getf map :tiles)))))
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(defun matrix-write-cell (matrix cell)
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"Set a matrice's (2d array's) element corresponding to a “cell”; that is, an
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alist containing a character (:CHAR) and :X & :Y coordinates."
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(let ((coords (world-coords->screen-coords (getf cell :coords))))
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(setf (aref matrix
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(getf coords :y)
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(getf coords :x))
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(getf cell :char))))
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(defun layer-objects (layer)
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(slot-value layer 'cl-tiled.data-types::objects))
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(defun tiled-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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(defun cell-at-world-coords-p (map-chunks coords)
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"Return whether or not there is a cell at the given coordinates."
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(let ((chunk (world-coords-chunk coords)))
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(member 't (cdr (assoc chunk map-chunks))
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:test (lambda (ignored cell)
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(plist= (getf cell :coords) coords)))))
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(defun walkable-tile-p (map x y)
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"Return whether or not the given coordinates on the map are traversable for an entity."
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(not (cell-at-world-coords-p (getf map :bump-map)
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(list :x x :y y))))
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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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;;; ———————————————————————————————————
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;;; Entity magic (AKA player, NPCs)
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;;; ———————————————————————————————————
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(defun matrix-write-entities (matrix map)
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"Draw all entities from an alist of entities to the matrix."
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(mapcar (lambda (entity-assoc)
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(matrix-write-entity matrix (cdr entity-assoc)))
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(getf map :entities)))
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(defun matrix-write-entity (matrix entity-plist)
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"Render an entity-plist to the matrix."
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(matrix-write-entity-head matrix entity-plist)
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(matrix-write-entity-legs matrix entity-plist))
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(defun matrix-write-entity-head (matrix entity-plist)
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"Draw an entity’s head. There aren't any Mami Tomoes in this game, dang it!"
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(let* ((screen-coords (world-coords->screen-coords (getf entity-plist :coords)))
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(direction (getf entity-plist :direction))
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(face (getf entity-plist :face))
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(width (+ (length face) 2)) ;; Face + |borders|
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(y (- (getf screen-coords :y) 1))
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(x (if (eq direction 'right)
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(- (getf screen-coords :x) (floor (/ width 2)) 0)
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(- (getf screen-coords :x) (floor (/ width 2)) 0))))
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(render-line matrix face (+ x 1) y)
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(ignore-errors (setf (aref matrix y x) #\|))
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(ignore-errors (setf (aref matrix y (+ width x -1))
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#\|))))
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(defun matrix-write-entity-legs (matrix entity-plist)
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"Draw a bipdel entity’s legs — a surprisingly in-depth task!"
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(let* ((screen-coords (world-coords->screen-coords (getf entity-plist :coords)))
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(x (getf screen-coords :x))
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(y (getf screen-coords :y))
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(direction (getf entity-plist :direction)))
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(cond ((eq direction 'right)
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(ignore-errors (setf (aref matrix y x) #\|))
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(ignore-errors (setf (aref matrix y (- x 1)) #\|)))
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((eq direction 'left)
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(ignore-errors (setf (aref matrix y x) #\|))
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(ignore-errors (setf (aref matrix y (+ x 1)) #\|))))))
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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 every-other-element (list)
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"Collect every-other-element of a list. E.g., (1 2 3 4) → (1 3)."
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(when list
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(cons (car list)
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(every-other-element (cddr list)))))
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(defun plist= (a b &key (test #'eql))
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"Return whether or not two property lists are equal, by comparing values of each pair.
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Uses the keys of plist a."
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(let ((keys (every-other-element a)))
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(loop for key in keys
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do (when (not (apply test (list (getf a key)
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(getf b key))))
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(return nil))
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finally (return 't))))
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