Rewrite existing credits
Each credit has its own draw function Credits outside of the visible game area are not drawn
This commit is contained in:
Amy Grinn
parent
7d4d6115a4
commit
afef0fd480
5 changed files with 174 additions and 76 deletions
7
game.js
7
game.js
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@ -81,7 +81,12 @@ window.addEventListener("load", async () => {
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translate: (ctx, x, y) => ctx.translate(x, y),
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rotate: (ctx, angle) => ctx.rotate(angle),
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setTransform: (ctx, a, b, c, d, e, f) => ctx.setTransform(a, b, c, d, e, f),
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setImageSmoothingEnabled: (ctx, enabled) => ctx.imageSmoothingEnabled = (enabled == 1)
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setImageSmoothingEnabled: (ctx, enabled) => ctx.imageSmoothingEnabled = (enabled == 1),
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measureText: (ctx, text) => ctx.measureText(text),
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},
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textMetrics: {
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actualBoundingBoxAscent: (metrics) => metrics.actualBoundingBoxAscent,
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actualBoundingBoxDescent: (metrics) => metrics.actualBoundingBoxDescent,
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},
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math: {
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random: () => Math.random()
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200
game.scm
200
game.scm
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@ -20,6 +20,7 @@
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;;; Code:
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(use-modules (dom canvas)
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(dom text-metrics)
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(dom document)
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(dom element)
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(dom event)
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@ -62,7 +63,8 @@
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(math)
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(math rect)
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(math vector)
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(scheme base))
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(scheme base)
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(srfi srfi-1))
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(define game-width 320.0)
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(define game-height 240.0)
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@ -228,8 +230,8 @@
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(define (load-credits!)
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(replace-game-state! 'credits)
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(set! *actormap* (make-whactormap))
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(set-vec2-y! *credits-scroll* 0.0)
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(clear-snapshots!)
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(set! *credits-top* credits-start)
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(with-goblins
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(set! *level* (load-credits #f))
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(update-objects!)))
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@ -396,6 +398,127 @@
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(pop-menu-history!)
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((cdr (vector-ref (menu-items (current-menu)) (current-menu-index))))))
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;; Credits
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(define credits-margin 40.0) ;; pixels
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(define credits-speed 30.0) ;; frames per line (inverse speed)
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(define credits-start (+ game-height (* 0.75 tile-height)))
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(define credits-end (* 0.75 tile-height))
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(define *credits-top* credits-start)
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(define _line-height #f)
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(define (line-height)
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(unless _line-height
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(set-font! context "normal 16px monogram")
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(let ((metrics (measure-text context "Aj")))
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(set! _line-height
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(* (+ (text-metrics-actual-bounding-box-ascent metrics)
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(text-metrics-actual-bounding-box-descent metrics))
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1.2))))
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_line-height)
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(define-record-type <credit>
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(_make-credit height draw)
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credit?
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(height credit-height)
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(draw credit-draw))
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(define* (make-credit #:key height draw)
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(_make-credit height draw))
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(define* (make-credit-group #:rest credits)
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(make-credit
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#:height (fold (lambda (c prev)
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(+ prev (credit-height c)))
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0 credits)
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#:draw
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(lambda (top)
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(do ((i 0 (1+ i))
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(y top (+ y (* (credit-height (list-ref credits i))
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(line-height)))))
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((= i (length credits)))
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((credit-draw (list-ref credits i)) y)))))
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(define* (make-credit-space #:optional (lines 1))
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(make-credit
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#:height lines
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#:draw (lambda (y) #f)))
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(define (make-credit-text text)
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(make-credit
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#:height 1
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#:draw
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(lambda (y)
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(set-fill-color! context "#fff")
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(set-text-align! context "center")
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(set-font! context "normal 16px monogram")
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(fill-text context text
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(* 0.7 game-width) y))))
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(define (make-credit-underline text)
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(make-credit-group
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(make-credit-text text)
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(make-credit-text (make-string (string-length text)
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#\-))))
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(define credits
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(vector (make-credit-group
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(make-credit-text "Phew, you made it!")
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(make-credit-text "Time to relax."))
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(make-credit-group
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(make-credit-text "Cirkoban was made by the")
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(make-credit-text "Spritely Institute"))
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(make-credit-group
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(make-credit-text "https://spritely.institute"))
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(make-credit-group
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(make-credit-underline "Game Design")
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(make-credit-text "Christine Lemmer-Webber"))
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(make-credit-group
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(make-credit-underline "Level Design")
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(make-credit-text "Christine Lemmer-Webber")
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(make-credit-text "Juliana Sims")
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(make-credit-text "David Thompson"))
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(make-credit-group
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(make-credit-underline "Pixel Art")
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(make-credit-text "Christine Lemmer-Webber"))
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(make-credit-group
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(make-credit-underline "Music")
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(make-credit-text "EncryptedWhispers")
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(make-credit-text "Christine Lemmer-Webber"))
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(make-credit-group
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(make-credit-underline "Programming")
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(make-credit-text "Juliana Sims")
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(make-credit-text "David Thompson")
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(make-credit-text "Amy Grinn"))
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(make-credit-group
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(make-credit-underline "Other")
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(make-credit-text "monogram font by datagoblin"))
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(make-credit-space 4)
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(make-credit-text "Thank you for playing!")))
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(define (draw-credits)
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(draw-level)
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(let ((height (lambda (c)
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(+ (* (credit-height c) (line-height))
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credits-margin)))
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(i 0)
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(y *credits-top*))
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;; Ignore credits that are higher than the top of the game
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(while (and (< i (vector-length credits))
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(< y (- (height (vector-ref credits i))) credits-end))
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(set! y (+ y (height (vector-ref credits i))))
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(set! i (1+ i)))
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;; Draw credits that are higher than the bottom of the game
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(while (and (< i (vector-length credits)) (<= y credits-start))
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((credit-draw (vector-ref credits i)) y)
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(set! y (+ y (height (vector-ref credits i))))
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(set! i (1+ i))))
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(set! *credits-top* (- *credits-top* (/ (line-height) credits-speed))))
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(define (reset-game!)
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(run-script
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(lambda ()
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@ -786,7 +909,7 @@
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(vec2-x center) y-text))
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(set-text-align! context "left")
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;; indicator
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(when (= (+ r r-page-offset) (current-menu-index))
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(when (= r-page (current-menu-index))
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(fill-text context "▸" x-gutter y-text))
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;; Menu items
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(when (>= r -1)
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@ -842,77 +965,6 @@
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(define (draw-interstitial)
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(draw-level))
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(define *credits-scroll* (vec2 0.0 0.0))
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(define credits
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#("Phew, you made it!"
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"Time to relax."
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#f
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#f
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"Cirkoban was made by the"
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"Spritely Institute"
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#f
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"https://spritely.institute"
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#f
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"Game Design"
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"-----------"
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"Christine Lemmer-Webber"
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#f
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"Level Design"
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"------------"
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"Christine Lemmer-Webber"
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"Juliana Sims"
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"David Thompson"
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#f
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"Pixel Art"
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"---------"
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"Christine Lemmer-Webber"
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#f
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"Music"
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"-----"
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"EncryptedWhispers"
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"Christine Lemmer-Webber"
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#f
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"Programming"
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"-----------"
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"Juliana Sims"
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"David Thompson"
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#f
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"Other"
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"-----"
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"monogram font by datagoblin"
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#f
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#f
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#f
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#f
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#f
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#f
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#f
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#f
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"Thank you for playing!"))
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(define credits-line-spacing 16.0)
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(define max-credits-scroll
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(+ game-height (* (- (vector-length credits) 9) credits-line-spacing)))
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(define (draw-credits)
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(draw-level)
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(set-fill-color! context "#ffffff")
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(set-text-align! context "center")
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(set-font! context "normal 16px monogram")
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(set-vec2-y! *credits-scroll*
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(min (+ (vec2-y *credits-scroll*) 0.5)
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max-credits-scroll))
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(let* ((x (* game-width 0.7))
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(lines-on-screen 15)
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(scroll-y (vec2-y *credits-scroll*))
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;; TODO: Only render the lines on screen.
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(start 0)
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(end (vector-length credits)))
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(let lp ((i start) (y (- game-height scroll-y)))
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(when (< i end)
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(match (vector-ref credits i)
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(#f #f)
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(str (fill-text context str x y)))
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(lp (1+ i) (+ y credits-line-spacing))))))
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(define *frame-time* (current-time*))
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(define (draw time)
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(unless (and (real? time) (inexact? time))
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@ -39,7 +39,8 @@
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translate!
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rotate!
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set-transform!
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set-image-smoothing-enabled!))
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set-image-smoothing-enabled!
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measure-text))
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;; HTMLCanvasElement
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(define-foreign get-context
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@ -98,3 +99,6 @@
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(define-foreign set-image-smoothing-enabled!
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"canvas" "setImageSmoothingEnabled"
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(ref extern) i32 -> none)
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(define-foreign measure-text
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"canvas" "measureText"
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(ref extern) (ref string) -> (ref extern))
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34
modules/dom/text-metrics.scm
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34
modules/dom/text-metrics.scm
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@ -0,0 +1,34 @@
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;;; Copyright (C) 2025 Amy Grinn <amy@spritely.institute>
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;;;
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;;; Licensed under the Apache License, Version 2.0 (the "License");
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;;; you may not use this file except in compliance with the License.
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;;; You may obtain a copy of the License at
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;;;
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;;; http://www.apache.org/licenses/LICENSE-2.0
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;;;
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;;; Unless required by applicable law or agreed to in writing, software
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;;; distributed under the License is distributed on an "AS IS" BASIS,
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;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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;;; See the License for the specific language governing permissions and
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;;; limitations under the License.
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;;; Commentary:
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;;;
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;;; HTML canvas TextMetrics interface bindings
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;;;
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;;; Code:
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(define-module (dom text-metrics)
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#:pure
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#:use-module (scheme base)
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#:use-module (hoot ffi)
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#:export (text-metrics-actual-bounding-box-ascent
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text-metrics-actual-bounding-box-descent))
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(define-foreign text-metrics-actual-bounding-box-ascent
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"textMetrics" "actualBoundingBoxAscent"
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(ref extern) -> i32)
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(define-foreign text-metrics-actual-bounding-box-descent
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"textMetrics" "actualBoundingBoxDescent"
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(ref extern) -> i32)
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3
modules/srfi/srf-1.scm
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3
modules/srfi/srf-1.scm
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@ -0,0 +1,3 @@
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(define-module (srfi srfi-1)
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#:use-module ((scheme base) #:select (fold))
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#:re-export (fold))
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