Jaidyn Ann
ce3dcebbb4
The previous method — clearing the screen and completely redrawing every frame — caused severe screen-flickering. This is better, calculating the changed characters per-frame and printing only those.
123 lines
3.7 KiB
Common Lisp
123 lines
3.7 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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;;
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;; Made for the text-flavoured LibreJam of 2023-06!
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;; https://jamgaroo.xyz/jams/2
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;; 72x20
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(ql:quickload '(alexandria cl-tiled str))
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(defun move-cursor (row column &key (stream *standard-output*))
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"Moves cursor to desired position.
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Borrowed from https://github.com/gorozhin/chlorophyll/
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© 2022 Mikhail Gorozhin — MIT license"
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(format stream "~C[~A;~AH" #\Esc row column))
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(defun clear-screen (&key (stream *standard-output*))
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"Completely clear the terminal screen."
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(move-cursor 0 0 :stream stream)
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(format stream "~C[J" #\Esc))
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(defun matrix-delta (a b)
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"Given two 2D matrices, return a listcontaining on the cells that change between a→b in the following
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format:
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only the cells that change between a→b — all others are nil."
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(let* ((dimensions (array-dimensions a))
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(delta (make-array dimensions :initial-element nil))
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(max-i (car dimensions))
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(max-j (cadr dimensions))
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(i 0) (j 0))
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(loop
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(cond
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((< i max-i)
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(cond
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((< j max-j)
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(if (not (eq (aref a i j)
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(aref b i j)))
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(setf (aref delta i j)
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(aref b i j)))
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(incf j))
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((eq j max-j)
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(setf j 0)
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(incf i))))
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((eq i max-i)
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(return))))
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delta))
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(defun print-screen-matrix (array)
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"Given a matrix of characters, print each element to standard output."
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(let* ((dimensions (array-dimensions array))
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(max-i (car dimensions))
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(max-j (cadr dimensions))
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(i 0) (j 0))
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(loop
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(cond
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((< i max-i)
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(cond
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((< j max-j)
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(if (characterp (aref array i j))
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(progn
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(move-cursor i j)
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(write-char (aref array i j))))
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(incf j))
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((eq j max-j)
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(setf j 0)
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(incf i))))
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((eq i max-i)
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(return))))))
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(defun screen-matrix-set-map (array map-path)
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"Draw a Tiled-format tilemap to the 2D array."
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(mapcar (lambda (layer) (screen-matrix-set-map-layer array layer))
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(cl-tiled:map-layers (cl-tiled:load-map map-path)))
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array)
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(defun screen-matrix-set-map-layer (array tile-layer)
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"Set an array's elements to those corresponding the given Tiled
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tile-layer's cells. a Tiled tile-layer to the screen."
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(mapcar (lambda (cell) (screen-matrix-set-char-cell array cell))
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(cl-tiled:layer-cells tile-layer))
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array)
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(defun screen-matrix-set-char-cell (array cell)
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"Set a 2D array's element corresponding to a Tiled cell's
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character-value, using it's column and row."
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(setf (aref array
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(cl-tiled:cell-row cell)
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(cl-tiled:cell-column cell))
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(tile-character
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(cl-tiled:cell-tile cell))))
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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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(main)
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