fixed other model to deal with ladders

README.org

@@ -60,6 +60,32 @@ So now, go out, collect the keys and maintain a healthy diet!
  
 * Installation and Development
 
+** Download from itch.io
+
+Download the latest version from [[https://snamellit.itch.io/bloatrunner][Bloatrunner page on Itch.io]].
+
+Untar the filename, enter the newly created folder and launch `bloatrunner/bloatrunner`.
+
+#+BEGIN_SRC
+  tar -xzvf <download tar ball>
+  cd <terrible name>
+  bloatrunner/bloatrunner
+#+END_SRC
+
+
+
+
+*** TODO make an upload script which cleans up the filename
+
+The current filename contains the GUIX UUID which is ugly and not very
+userfriendly.
+
+There should be some CI script to build/create the tarball, rename it
+and upload it with a friendly name + version number.
+
+No idea how to get the name of the tarball from guix pack without
+parsing the output.
+
 ** Using Guix
 
 We *highly recommend* using [Guix](https://guix.gnu.org/) to manage your

game/main.scm

@@ -37,7 +37,7 @@
 (define (update dt)
   (poll-coop-repl-server repl)
   (set! hero (hero-update hero level inputs dt))
-  (set! others (map (lambda (other) (other-update other level dt)) others))
+  (set! others (map (lambda (other) (other-update other level hero others dt)) others))
   )
 
 (define (draw _alpha)

game/model/other.scm

@@ -7,6 +7,7 @@
   #:use-module (srfi srfi-64)
   #:use-module (chickadee math vector)
   #:use-module (game util pipe)
+  #:use-module (game model hero)
   #:use-module (game model level)
   #:use-module (game model runner)
   #:export (other-load-others
@@ -19,6 +20,9 @@
             ))
 
 
+;; The enemies in this game are called "others" because they are not you
+;; They are represented by a runner and try to reach the player to give
+;; unwelcome advice unwittingly killing the player with cringe.
 (define-immutable-record-type <other>
   (%make-other runner)
   other?
@@ -51,9 +55,40 @@
   "return the current position of the other"
   (runner-position (other-runner other)))
 
+(define (safe-ladder-position? position level)
+  "return true if the other can move left or right without falling of the ladder"
+  (let ((this-block (level-tile-at level position))
+        (block-left (level-tile-at level (vec2+ position (vec2 -1 0))))
+        (block-down-left (level-tile-at level (vec2+ position (vec2 -1 -1))))
+        (block-right (level-tile-at level (vec2+ position (vec2 1 0))))
+        (block-down-right (level-tile-at level (vec2+ position (vec2 1 -1)))))
+    (if (equal? this-block 'ladder) 
+        (and 
+         (not (equal? block-left 'brick))
+         (not (equal? block-right 'brick))
+         (member block-down-left '(brick ladder))
+         (member block-down-right '(brick ladder)))
+        #t                              ;; if not on ladder, it's safe
+        )))
 
-(define (other-update other level dt)
-  (other-with-runner other (runner-update (other-runner other) level '() dt)))
+;; Generate inputs for the other based on the level and
+;; the hero and other others.
+(define (determine-actions other level hero others)
+  (let ((actions '()))
+    (when  (safe-ladder-position? (other-position other) level) 
+      (when (< (hero-x hero) (other-x other))
+        (set! actions (cons 'left actions)))
+      (when (> (hero-x hero) (other-x other))
+        (set! actions (cons 'right actions))))
+    (when (< (hero-y hero) (other-y other))
+      (set! actions (cons 'down actions)))
+    (when (> (hero-y hero) (other-y other))
+      (set! actions (cons 'up actions)))
+    actions))
+
+(define (other-update other level hero others dt)
+(let ((inputs (determine-actions other level hero others)))
+  (other-with-runner other (runner-update (other-runner other) level inputs dt))))
 
 
 
@@ -66,6 +101,22 @@
   (test-equal 2 (length others))
   )
 
+(let* ((level (level-parse "WWWWWWW\nW...H...W\nW.BBHBB.W\nW...H...W\nW..H..W\nWBBBBBW\nWWWWWWW\n"))
+       (others (other-load-others level)))
+  (test-assert (safe-ladder-position? (vec2 32 32) level)) ;; not on ladder is safe
+  (test-assert (safe-ladder-position? (vec2 56 40) level)) ;; middle of ladder is safe
+  
+  (test-assert (not (safe-ladder-position? (vec2 64 48) level))) ;; left edge of ladder is unsafe
+  (test-assert (not (safe-ladder-position? (vec2 79 48) level))) ;; right edge of ladder is unsafe
+  
+  (test-assert (not (safe-ladder-position? (vec2 64 48) level))) ;; edge inside platform is unsafe
+  (test-assert (not (safe-ladder-position? (vec2 79 48) level))) ;; edge inside platform is unsafe
+  (test-assert (not (safe-ladder-position? (vec2 64 63) level))) ;; edge inside platform is unsafe
+  (test-assert (not (safe-ladder-position? (vec2 79 63) level))) ;; edge inside platform is unsafe
+  
+  (test-assert (safe-ladder-position? (vec2 64 80) level)) ;; edge at platform is safe
+  (test-assert (safe-ladder-position? (vec2 79 80) level)) ;; edge at platform is safe
+  )
 
 (test-end "other-model")
 

game/model/runner.scm

@@ -77,7 +77,7 @@
 (define (safe-move level pos move)
   (let ((new-pos (vec2+ pos move)))
     (if (level-tile-blocked? level new-pos)
-        (round-position pos) ;; snap to grid on collision with hard scenery
+        (pk "snap position " pos "to" (round-position pos)) ;; snap to grid on collision with hard scenery
         new-pos
         )))
 

game/render/other.scm

@@ -39,20 +39,20 @@
   (case (other-state other)
     ((stationary) (draw-sprite
                    (other-sprite-stationary other)
-                   (vec2+ (other-position other) (vec2 -0.0 1.0))))
+                   (vec2+ (other-position other) (vec2 -8.0 1.0))))
     ((fall) (draw-sprite
              (other-sprite-falling other)
-             (vec2+ (other-position other) (vec2 -0.0 1.0))))
+             (vec2+ (other-position other) (vec2 -8.0 1.0))))
     ((climb) (draw-sprite
               (other-sprite-climbing other)
-              (vec2+ (other-position other) (vec2 -0.0 1.0))))
+              (vec2+ (other-position other) (vec2 -8.0 1.0))))
     ((go-left) (draw-sprite
                 (other-sprite-walking other)
-                (vec2+ (other-position other) (vec2 0.0 1.0))
+                (vec2+ (other-position other) (vec2 8.0 1.0))
                 #:scale (vec2 -1.0 1.0)
                 ))
     ((go-right) (draw-sprite
                  (other-sprite-walking other)
-                 (vec2+ (other-position other) (vec2 -0.0 1.0))))
+                 (vec2+ (other-position other) (vec2 -8.0 1.0))))
     )
   )