Jaidyn Ann
94335468b3
It draws to the screen, now! Err, well, it has been able to do that, since my first day on this project. But until now, there wasn't a menu leading you there! c:<
95 lines
3.2 KiB
Common Lisp
95 lines
3.2 KiB
Common Lisp
;;;; Copyright © 2023, Jaidyn Ann <jadedctrl@posteo.at>
|
||
;;;;
|
||
;;;; This program is free software: you can redistribute it and/or
|
||
;;;; modify it under the terms of the GNU General Public License as
|
||
;;;; published by the Free Software Foundation, either version 3 of
|
||
;;;; the License, or (at your option) any later version.
|
||
;;;;
|
||
;;;; This program is distributed in the hope that it will be useful,
|
||
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
;;;; GNU General Public License for more details.
|
||
;;;;
|
||
;;;; You should have received a copy of the GNU General Public License
|
||
;;;; along with this program. If not, see <https://www.gnu.org/licenses/>.
|
||
|
||
;;;; FLORA-SEARCH-AURORA.DISPLAY
|
||
;;;; All display-related curses go here.
|
||
|
||
(defpackage :flora-search-aurora.display
|
||
(:use :cl)
|
||
(:export #:make-screen-matrix #:print-screen-matrix #:matrix-delta
|
||
#:clear-screen))
|
||
|
||
(in-package :flora-search-aurora.display)
|
||
|
||
|
||
(defmacro do-for-cell (matrix &body body)
|
||
"Given a 2d-array (matrix), execute the body for every cell.
|
||
The body has access to 4 variables:
|
||
* i/j — The current row/column.
|
||
* dimensions — Dimensions of the given matrix.
|
||
* cell — The value of the current cell."
|
||
`(let* ((dimensions (array-dimensions ,matrix))
|
||
(max-i (car dimensions))
|
||
(max-j (cadr dimensions))
|
||
(i 0) (j 0))
|
||
(loop
|
||
(let ((cell (ignore-errors (aref ,matrix i j))))
|
||
(cond
|
||
((< i max-i)
|
||
(cond
|
||
((< j max-j)
|
||
,@body
|
||
(incf j))
|
||
((eq j max-j)
|
||
(setf j 0)
|
||
(incf i))))
|
||
((eq i max-i)
|
||
(return)))))))
|
||
|
||
|
||
(defun matrix-delta (a b)
|
||
"Given two 2D matrices, return a matrix containing only the cells
|
||
that change between a→b (favouring those in b) — all others are nil."
|
||
(let ((delta (make-array (array-dimensions a))))
|
||
(do-for-cell a
|
||
(when (not (eq cell
|
||
(aref b i j)))
|
||
(setf (aref delta i j)
|
||
(aref b i j))))
|
||
delta))
|
||
|
||
|
||
(defun print-screen-matrix (matrix)
|
||
"Given a matrix of characters, print each element to standard output."
|
||
(do-for-cell matrix
|
||
(when (characterp cell)
|
||
(move-cursor (+ i 1) (+ j 1))
|
||
(write-char cell)))
|
||
(destructuring-bind (i j) (array-dimensions matrix)
|
||
(move-cursor i j)))
|
||
|
||
|
||
(defun make-screen-matrix ()
|
||
"Create a “screen matrix” — that is, a 2D array representing the
|
||
72x20 grid of characters we can print to the terminal."
|
||
(make-array '(20 72) :initial-element #\space))
|
||
|
||
|
||
|
||
;;; ———————————————————————————————————
|
||
;;; Misc. utils
|
||
;;; ———————————————————————————————————
|
||
(defun move-cursor (row column &key (stream *standard-output*))
|
||
"Moves cursor to desired position.
|
||
Borrowed from https://github.com/gorozhin/chlorophyll/
|
||
Copyright © 2022 Mikhail Gorozhin — MIT license"
|
||
(format stream "~C[~A;~AH" #\Esc row column))
|
||
|
||
|
||
(defun clear-screen (&key (stream *standard-output*))
|
||
"Completely clear the terminal screen."
|
||
(move-cursor 0 0 :stream stream)
|
||
(format stream "~C[J" #\Esc))
|