1 files changed, 71 insertions, 0 deletions
diff --git a/demo/sandbox.scm b/demo/sandbox.scm
new file mode 100644
index 0000000..1be3968
--- /dev/null
+++ b/demo/sandbox.scm
@@ -0,0 +1,71 @@
+(import scheme
+        (chicken base)
+        (chicken random)
+        (prefix sdl2 "sdl2:")
+        (prefix sdl2-ttf "ttf:")
+        (prefix sdl2-image "img:")
+        downstroke/engine
+        downstroke/world
+        downstroke/tilemap
+        downstroke/renderer
+        downstroke/input
+        downstroke/physics
+        downstroke/assets
+        downstroke/entity)
+
+(define *elapsed* 0)
+(define *respawn-interval* 10000)
+
+(define (spawn-entities)
+  (let loop ((i 0) (acc '()))
+    (if (= i 10)
+        acc
+        (loop (+ i 1)
+              (cons (list #:type 'box
+                          #:x (+ 30 (* i 55))
+                          #:y (+ 10 (* (pseudo-random-integer 4) 20))
+                          #:width 16 #:height 16
+                          #:vx 0 #:vy 0
+                          #:gravity? #t
+                          #:on-ground? #f
+                          #:solid? #t
+                          #:tile-id 1)
+                    acc)))))
+
+(define *game*
+  (make-game
+    title: "Demo: Physics Sandbox" width: 600 height: 400
+
+    preload: (lambda (game)
+      (game-asset-set! game 'tilemap
+        (load-tilemap "demo/assets/level-0.tmx")))
+
+    create: (lambda (game)
+      (let* ((tm  (game-asset game 'tilemap))
+             (tex (sdl2:create-texture-from-surface
+                    (game-renderer game)
+                    (tileset-image (tilemap-tileset tm)))))
+        (game-scene-set! game
+          (make-scene
+            entities:        (spawn-entities)
+            tilemap:         tm
+            camera:          (make-camera x: 0 y: 0)
+            tileset-texture: tex))))
+
+    update: (lambda (game dt)
+      (let* ((scene (game-scene game))
+             (tm    (scene-tilemap scene)))
+        (set! *elapsed* (+ *elapsed* dt))
+        (when (>= *elapsed* *respawn-interval*)
+          (set! *elapsed* 0)
+          (scene-entities-set! scene (spawn-entities)))
+        (scene-update-entities scene
+          apply-gravity
+          apply-velocity-x
+          (lambda (e) (resolve-tile-collisions-x e tm))
+          apply-velocity-y
+          (lambda (e) (resolve-tile-collisions-y e tm))
+          (lambda (e) (detect-ground e tm)))
+        (scene-resolve-collisions scene)))))
+
+(game-run! *game*)