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;;; The Inevitable Game
;;; Copyright © 2018, 2021 Ricardo Wurmus <rekado@elephly.net>
;;;
;;; 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
;;; <http://www.gnu.org/licenses/>.
(define-module (utils)
#:use-module (chickadee)
#:use-module (chickadee audio)
#:use-module (chickadee math vector)
#:use-module (chickadee graphics color)
#:use-module (chickadee graphics font)
#:use-module (chickadee graphics path)
#:use-module (chickadee graphics sprite)
#:use-module (chickadee graphics texture)
#:use-module (chickadee graphics tile-map)
#:use-module (chickadee scripting)
#:use-module (config)
#:use-module (engine assets)
#:use-module (srfi srfi-1)
#:use-module (ice-9 match)
#:use-module (oop goops)
#:export (arrange-text
<label>
draw-label
visible?
<sprite>
agenda
position
texture
tint
draw
<animated-sprite>
atlas
draw-animated-sprite
update-animated-sprite
change-sprite-animation
<character>
name
velocity
walk-speed
direction
conversations
accepted-messages
speaking?
walk))
(define* (arrange-text text font #:key
(margin 0.0)
(max-width %width))
"Take the string TEXT and split it at spaces so that it fits in the
given MAX-WIDTH. Return a list of lines."
(match (fold (lambda (chunk acc)
(match acc
((#:width width #:result (and (current-line . tail) lines))
(let* ((new-line (string-append current-line " " chunk))
(new-width (font-line-width font new-line)))
(if (< (+ new-width margin) max-width)
`(#:width ,new-width
#:result ,(cons new-line tail))
`(#:width ,(font-line-width font chunk)
#:result ,(cons chunk lines)))))))
'(#:width 0 #:result (""))
(string-tokenize text))
((#:width _ #:result lines)
(reverse lines))))
(define-class <label> ()
(position #:accessor position #:init-keyword #:position)
(visible? #:accessor visible? #:init-keyword #:visible?)
(font #:accessor font #:init-keyword #:font)
(text #:accessor text #:init-form "" #:init-keyword #:text))
(define-method (draw-label label alpha)
(when (visible? label)
(draw-text (text label) (position label)
#:font (asset-ref (font label)))))
(define-class <sprite> ()
(agenda #:getter agenda #:init-form (make-agenda))
(position #:accessor position #:init-keyword #:position)
(texture #:accessor texture #:init-keyword #:texture)
(tint #:accessor tint #:init-keyword #:tint #:init-form white))
(define-method (draw (sprite <sprite>) alpha)
(draw-sprite (asset-ref (texture sprite))
(position sprite)
#:tint (tint sprite)))
(define-class <animated-sprite> (<sprite>)
(atlas #:accessor atlas #:init-keyword #:atlas)
(animations #:accessor animations #:init-keyword #:animations)
(frame-duration #:accessor frame-duration #:init-keyword #:frame-duration)
(current-animation #:accessor current-animation
#:init-keyword #:current-animation)
(start-time #:accessor start-time #:init-form 0))
(define (draw-animated-sprite sprite offset)
(draw-sprite (asset-ref (texture sprite))
(vec2+ offset (position sprite))
#:tint (tint sprite)))
(define (update-animated-sprite sprite dt)
(let* ((anim (assq-ref (animations sprite) (current-animation sprite)))
(frame-duration (frame-duration sprite))
(anim-duration (* frame-duration (vector-length anim)))
(time (modulo (- (agenda-time) (start-time sprite)) anim-duration))
(frame (vector-ref anim (floor (/ time frame-duration))))
(texture-region (texture-atlas-ref (asset-ref (atlas sprite)) frame)))
(set! (texture sprite) texture-region)))
(define (change-sprite-animation sprite name)
(set! (current-animation sprite) name)
(set! (start-time sprite) (with-agenda (agenda sprite) (agenda-time))))
(define-class <character> (<animated-sprite>)
(name #:getter name #:init-keyword #:name)
(velocity #:getter velocity #:init-form (vec2 0.0 0.0))
(walk-speed #:accessor walk-speed #:init-form 0.8)
(direction #:accessor direction #:init-form '(idle))
(conversations #:accessor conversations #:init-keyword #:conversations)
(accepted-messages #:accessor accepted-messages #:init-form '((hello "Hello there!")))
(speaking? #:accessor speaking? #:init-form #false))
(define-method (walk (character <character>) directions . rest)
(let ((stop? (member 'stop rest)))
(unless (and (equal? (direction character) directions)
(not stop?))
(let ((speed (if stop? 0.0 (walk-speed character))))
(change-sprite-animation character (last directions))
(for-each (lambda (dir)
(case dir
((right)
(set-vec2-x! (velocity character) speed))
((left)
(set-vec2-x! (velocity character) (* -1.0 speed)))
((up)
(set-vec2-y! (velocity character) speed))
((down)
(set-vec2-y! (velocity character) (* -1.0 speed)))
((idle)
(set-vec2-x! (velocity character) 0.0)
(set-vec2-y! (velocity character) 0.0)
(change-sprite-animation
character
(case (last (direction character))
((right) 'idle-right)
((left) 'idle-left)
((up) 'idle-back)
((down) 'idle-front))))))
directions)
(set! (direction character) directions)))))
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