split hero entity in model and render module

game/main.scm

@@ -1,6 +1,8 @@
 (define-module (game main)
   #:use-module (game model level)
+  #:use-module (game model hero)
   #:use-module (game render level)
+  #:use-module (game render hero)
   #:use-module (chickadee)
   #:use-module (chickadee math rect)
   #:use-module (chickadee math vector)
@@ -12,44 +14,27 @@
   #:use-module (system repl coop-server)
   #:export (launch-game))
 
-(define hero-texture #f)
-(define hero-atlas #f)
-(define hero-position (vec2 32.0 32.0))
 (define level #f)
 (define repl #f)
+(define hero #f)
 
 (define (load)
   (render-level-load)
-  (set! hero-texture (load-image "assets/images/lr_penguin2.png"))
-  (set! hero-atlas (split-texture hero-texture 32 32))
+  (render-hero-load)
   (set! level (level-parse-file "assets/levels/level-1.map"))
   (render-level-set! level)
+  (set! hero (hero-load))
   (set! repl (spawn-coop-repl-server)))
 
 (define (update dt)
   (poll-coop-repl-server repl)
-  (set-vec2-x! hero-position
-               (floor-remainder (+ (vec2-x hero-position) (* 50.0 dt)) 608.0)))
-
-(define (draw-hero i)
-  (let ((x (* 64 (remainder i 8)))
-        (y (* 32 (quotient i 8)))
-        )
-    (draw-sprite
-     (texture-atlas-ref hero-atlas i)
-     (vec2 (+ x 16) y)
-     #:scale (vec2 1.0 1.0))
-    (draw-text (format #f "~A" i) (vec2 x y) #:color white))
-  )
-
-
+  (set! hero 
+    (hero-with-x hero
+                 (floor-remainder (+ (hero-x hero) (* 50.0 dt)) 608.0))))
 
 (define (draw _alpha)
   (render-level-draw level)
-  (let ((hero-index (+ 56 (remainder (inexact->exact (floor (vec2-x hero-position))) 8))))
-    (draw-sprite
-     (texture-atlas-ref hero-atlas hero-index)
-     (vec2+ hero-position (vec2 16.0 0.0))))
+  (render-hero hero)
   )
 
 (define (launch-game args)

game/model/hero.scm

@@ -3,10 +3,16 @@
   #:use-module (srfi srfi-9)
   #:use-module (srfi srfi-9 gnu)
   #:use-module (srfi srfi-64)
+  #:use-module (chickadee math vector)
   #:export (hero-load
+            hero-x hero-with-x
+            hero-y hero-with-y
+            hero-state hero-with-state
+            hero-bloat hero-with-bloat
+            hero-position
+            ))
+
 
-            )
-  )
 (define-immutable-record-type <hero>
   (%make-hero x y state bloat)
   hero?
@@ -17,13 +23,15 @@
   )
 
 (define default-x 320)
-(define default-y 16)
+(define default-y 32)
 (define default-state 'stationary)
 (define default-bloat 1.0)
 
 (define (hero-load)
   (%make-hero default-x default-y default-state default-bloat))
 
+(define (hero-position hero)
+  (vec2 (hero-x hero) (hero-y hero)))
 
 ;; Tests
 [test-begin "hero model"]
@@ -43,4 +51,6 @@
   (test-equal 1.5 (hero-bloat (hero-with-bloat hero 1.5)))
   (test-equal default-bloat (hero-bloat hero)))
 
+(test-equal (vec2 default-x default-y) (hero-position (hero-load)))
+
 (test-end "hero model")

game/render/hero.scm

@@ -0,0 +1,34 @@
+(define-module (game render hero)
+  #:use-module (game model hero)
+  #:use-module (chickadee)
+  #:use-module (chickadee math vector)
+  #:use-module (chickadee graphics sprite)
+  #:use-module (chickadee graphics texture)
+  #:export (render-hero
+            render-hero-load)
+  )
+
+
+(define hero-texture #f)
+(define hero-atlas #f)
+
+
+(define (render-hero-load)
+  (set! hero-texture (load-image "assets/images/lr_penguin2.png"))
+  (set! hero-atlas (split-texture hero-texture 32 32))) 
+
+;; start index of the walk animation
+(define hero-walk-offset 56)
+
+(define (hero-sprite hero)
+  (let* ((x (inexact->exact (floor (vec2-x (hero-position hero)))))
+         (x-offset (remainder x 8))
+         (hero-index (+ hero-walk-offset x-offset)))
+    (texture-atlas-ref hero-atlas hero-index)))
+
+(define (render-hero hero)
+  (draw-sprite
+   (hero-sprite hero)
+   (vec2+ 
+    (hero-position hero) 
+    (vec2 16.0 0.0))))