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Avoiding string-append for drawing menu

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Amy Grinn 2024-12-17 14:42:15 -05:00
parent a42d5c5656
commit 8627f06ebd
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GPG key ID: 6B558BED1DCF3192
1 changed files with 19 additions and 14 deletions
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33
game.scm
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@ -753,7 +753,9 @@
(1+ menu:max-items)
num-items)))
(r-start (- -2 padding-y))
(r-end (- (+ r-start height) padding-y)))
(r-end (- (+ r-start height) padding-y))
(gutter-x (- (vec2-x center) (* tile-width (1- (floor (/ width 2))))))
(text-x (+ tile-width gutter-x)))
(let row ((r r-start)
(y (- (vec2-y center) (* tile-height (floor (/ height 2))))))
;; Draw menu background
@ -766,21 +768,24 @@
(set-stroke-color! context "blue")
(stroke-rect context x y w h)))
;; Draw menu text
(set-text-align! context "center")
(set-font! context "normal 16px monogram")
(set-fill-color! context "#fff")
(let ((r-index (- (+ r (* (current-menu-page) menu:max-items)) (current-menu-page))))
(if (= r r-start)
(fill-text context (menu-name (current-menu)) (vec2-x center) (+ y text-offset-y))
(if (and (>= r -1) (< r-index num-items) (< r r-end))
(let* ((item (if (= r -1)
(if (= (current-menu-page) 0)
"Back" "...")
(if (and (= r (1- r-end)) (< r-index (1- num-items)))
"..."
(menu-item-name (vector-ref (menu-items (current-menu)) r-index)))))
(text (string-append (if (= r-index (current-menu-index)) "▸ " " ") item)))
(fill-text context text (vec2-x center) (+ y text-offset-y))))))
(when (= r r-start)
(set-text-align! context "center")
(fill-text context (menu-name (current-menu)) (vec2-x center) (+ y text-offset-y)))
(let* ((r-index (- (+ r (* (current-menu-page) menu:max-items)) (current-menu-page))))
(set-text-align! context "left")
(if (= r-index (current-menu-index))
(fill-text context "▸" gutter-x (+ y text-offset-y)))
(if (and (>= r -1) (< r-index num-items) (< r r-end))
(fill-text context
(if (= r -1)
(if (= (current-menu-page) 0) "Back" "...")
(if (and (= r (1- r-end)) (< r-index (1- num-items)))
"..."
(menu-item-name (vector-ref (menu-items (current-menu))
r-index))))
text-x (+ y text-offset-y))))
;; Draw next row
(set! r (1+ r))
(if (< r (+ r-start height))