54 lines
2.0 KiB
Common Lisp
54 lines
2.0 KiB
Common Lisp
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;;;; 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.UTIL
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;;;; Utility functions used by multiple overworld packages (overworld.tiled & overworld).
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(defpackage :flora-search-aurora.overworld.util
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(:nicknames :fsa.o.u :overworld.util)
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(:use :cl)
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(:export #:coords->symbol #:symbol->coords
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#:world-coords->screen-coords
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#:world-coords-chunk))
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(in-package :flora-search-aurora.overworld.util)
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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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(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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