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 2025-01-08 12:26:08 -05:00
parent 7d4d6115a4
commit afef0fd480
No known key found for this signature in database
GPG key ID: 6B558BED1DCF3192
5 changed files with 174 additions and 76 deletions

View file

@ -81,7 +81,12 @@ window.addEventListener("load", async () => {
translate: (ctx, x, y) => ctx.translate(x, y),
rotate: (ctx, angle) => ctx.rotate(angle),
setTransform: (ctx, a, b, c, d, e, f) => ctx.setTransform(a, b, c, d, e, f),
setImageSmoothingEnabled: (ctx, enabled) => ctx.imageSmoothingEnabled = (enabled == 1)
setImageSmoothingEnabled: (ctx, enabled) => ctx.imageSmoothingEnabled = (enabled == 1),
measureText: (ctx, text) => ctx.measureText(text),
},
textMetrics: {
actualBoundingBoxAscent: (metrics) => metrics.actualBoundingBoxAscent,
actualBoundingBoxDescent: (metrics) => metrics.actualBoundingBoxDescent,
},
math: {
random: () => Math.random()

200
game.scm
View file

@ -20,6 +20,7 @@
;;; Code:
(use-modules (dom canvas)
(dom text-metrics)
(dom document)
(dom element)
(dom event)
@ -62,7 +63,8 @@
(math)
(math rect)
(math vector)
(scheme base))
(scheme base)
(srfi srfi-1))
(define game-width 320.0)
(define game-height 240.0)
@ -228,8 +230,8 @@
(define (load-credits!)
(replace-game-state! 'credits)
(set! *actormap* (make-whactormap))
(set-vec2-y! *credits-scroll* 0.0)
(clear-snapshots!)
(set! *credits-top* credits-start)
(with-goblins
(set! *level* (load-credits #f))
(update-objects!)))
@ -396,6 +398,127 @@
(pop-menu-history!)
((cdr (vector-ref (menu-items (current-menu)) (current-menu-index))))))
;; Credits
(define credits-margin 40.0) ;; pixels
(define credits-speed 30.0) ;; frames per line (inverse speed)
(define credits-start (+ game-height (* 0.75 tile-height)))
(define credits-end (* 0.75 tile-height))
(define *credits-top* credits-start)
(define _line-height #f)
(define (line-height)
(unless _line-height
(set-font! context "normal 16px monogram")
(let ((metrics (measure-text context "Aj")))
(set! _line-height
(* (+ (text-metrics-actual-bounding-box-ascent metrics)
(text-metrics-actual-bounding-box-descent metrics))
1.2))))
_line-height)
(define-record-type <credit>
(_make-credit height draw)
credit?
(height credit-height)
(draw credit-draw))
(define* (make-credit #:key height draw)
(_make-credit height draw))
(define* (make-credit-group #:rest credits)
(make-credit
#:height (fold (lambda (c prev)
(+ prev (credit-height c)))
0 credits)
#:draw
(lambda (top)
(do ((i 0 (1+ i))
(y top (+ y (* (credit-height (list-ref credits i))
(line-height)))))
((= i (length credits)))
((credit-draw (list-ref credits i)) y)))))
(define* (make-credit-space #:optional (lines 1))
(make-credit
#:height lines
#:draw (lambda (y) #f)))
(define (make-credit-text text)
(make-credit
#:height 1
#:draw
(lambda (y)
(set-fill-color! context "#fff")
(set-text-align! context "center")
(set-font! context "normal 16px monogram")
(fill-text context text
(* 0.7 game-width) y))))
(define (make-credit-underline text)
(make-credit-group
(make-credit-text text)
(make-credit-text (make-string (string-length text)
#\-))))
(define credits
(vector (make-credit-group
(make-credit-text "Phew, you made it!")
(make-credit-text "Time to relax."))
(make-credit-group
(make-credit-text "Cirkoban was made by the")
(make-credit-text "Spritely Institute"))
(make-credit-group
(make-credit-text "https://spritely.institute"))
(make-credit-group
(make-credit-underline "Game Design")
(make-credit-text "Christine Lemmer-Webber"))
(make-credit-group
(make-credit-underline "Level Design")
(make-credit-text "Christine Lemmer-Webber")
(make-credit-text "Juliana Sims")
(make-credit-text "David Thompson"))
(make-credit-group
(make-credit-underline "Pixel Art")
(make-credit-text "Christine Lemmer-Webber"))
(make-credit-group
(make-credit-underline "Music")
(make-credit-text "EncryptedWhispers")
(make-credit-text "Christine Lemmer-Webber"))
(make-credit-group
(make-credit-underline "Programming")
(make-credit-text "Juliana Sims")
(make-credit-text "David Thompson")
(make-credit-text "Amy Grinn"))
(make-credit-group
(make-credit-underline "Other")
(make-credit-text "monogram font by datagoblin"))
(make-credit-space 4)
(make-credit-text "Thank you for playing!")))
(define (draw-credits)
(draw-level)
(let ((height (lambda (c)
(+ (* (credit-height c) (line-height))
credits-margin)))
(i 0)
(y *credits-top*))
;; Ignore credits that are higher than the top of the game
(while (and (< i (vector-length credits))
(< y (- (height (vector-ref credits i))) credits-end))
(set! y (+ y (height (vector-ref credits i))))
(set! i (1+ i)))
;; Draw credits that are higher than the bottom of the game
(while (and (< i (vector-length credits)) (<= y credits-start))
((credit-draw (vector-ref credits i)) y)
(set! y (+ y (height (vector-ref credits i))))
(set! i (1+ i))))
(set! *credits-top* (- *credits-top* (/ (line-height) credits-speed))))
(define (reset-game!)
(run-script
(lambda ()
@ -786,7 +909,7 @@
(vec2-x center) y-text))
(set-text-align! context "left")
;; indicator
(when (= (+ r r-page-offset) (current-menu-index))
(when (= r-page (current-menu-index))
(fill-text context "▸" x-gutter y-text))
;; Menu items
(when (>= r -1)
@ -842,77 +965,6 @@
(define (draw-interstitial)
(draw-level))
(define *credits-scroll* (vec2 0.0 0.0))
(define credits
#("Phew, you made it!"
"Time to relax."
#f
#f
"Cirkoban was made by the"
"Spritely Institute"
#f
"https://spritely.institute"
#f
"Game Design"
"-----------"
"Christine Lemmer-Webber"
#f
"Level Design"
"------------"
"Christine Lemmer-Webber"
"Juliana Sims"
"David Thompson"
#f
"Pixel Art"
"---------"
"Christine Lemmer-Webber"
#f
"Music"
"-----"
"EncryptedWhispers"
"Christine Lemmer-Webber"
#f
"Programming"
"-----------"
"Juliana Sims"
"David Thompson"
#f
"Other"
"-----"
"monogram font by datagoblin"
#f
#f
#f
#f
#f
#f
#f
#f
"Thank you for playing!"))
(define credits-line-spacing 16.0)
(define max-credits-scroll
(+ game-height (* (- (vector-length credits) 9) credits-line-spacing)))
(define (draw-credits)
(draw-level)
(set-fill-color! context "#ffffff")
(set-text-align! context "center")
(set-font! context "normal 16px monogram")
(set-vec2-y! *credits-scroll*
(min (+ (vec2-y *credits-scroll*) 0.5)
max-credits-scroll))
(let* ((x (* game-width 0.7))
(lines-on-screen 15)
(scroll-y (vec2-y *credits-scroll*))
;; TODO: Only render the lines on screen.
(start 0)
(end (vector-length credits)))
(let lp ((i start) (y (- game-height scroll-y)))
(when (< i end)
(match (vector-ref credits i)
(#f #f)
(str (fill-text context str x y)))
(lp (1+ i) (+ y credits-line-spacing))))))
(define *frame-time* (current-time*))
(define (draw time)
(unless (and (real? time) (inexact? time))

View file

@ -39,7 +39,8 @@
translate!
rotate!
set-transform!
set-image-smoothing-enabled!))
set-image-smoothing-enabled!
measure-text))
;; HTMLCanvasElement
(define-foreign get-context
@ -98,3 +99,6 @@
(define-foreign set-image-smoothing-enabled!
"canvas" "setImageSmoothingEnabled"
(ref extern) i32 -> none)
(define-foreign measure-text
"canvas" "measureText"
(ref extern) (ref string) -> (ref extern))

View file

@ -0,0 +1,34 @@
;;; Copyright (C) 2025 Amy Grinn <amy@spritely.institute>
;;;
;;; Licensed under the Apache License, Version 2.0 (the "License");
;;; you may not use this file except in compliance with the License.
;;; You may obtain a copy of the License at
;;;
;;; http://www.apache.org/licenses/LICENSE-2.0
;;;
;;; Unless required by applicable law or agreed to in writing, software
;;; distributed under the License is distributed on an "AS IS" BASIS,
;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;;; See the License for the specific language governing permissions and
;;; limitations under the License.
;;; Commentary:
;;;
;;; HTML canvas TextMetrics interface bindings
;;;
;;; Code:
(define-module (dom text-metrics)
#:pure
#:use-module (scheme base)
#:use-module (hoot ffi)
#:export (text-metrics-actual-bounding-box-ascent
text-metrics-actual-bounding-box-descent))
(define-foreign text-metrics-actual-bounding-box-ascent
"textMetrics" "actualBoundingBoxAscent"
(ref extern) -> i32)
(define-foreign text-metrics-actual-bounding-box-descent
"textMetrics" "actualBoundingBoxDescent"
(ref extern) -> i32)

3
modules/srfi/srf-1.scm Normal file
View file

@ -0,0 +1,3 @@
(define-module (srfi srfi-1)
#:use-module ((scheme base) #:select (fold))
#:re-export (fold))