Collision support

[gacela.git] / src / gacela.scm

diff --git a/src/gacela.scm b/src/gacela.scm
index f3794c98640e239e9dc8fef1c7dd153daeb09de3..6f14848aea95d97ebac51071380268a5a30748fe 100644 (file)
--- a/src/gacela.scm
+++ b/src/gacela.scm
@@ -38,14 +38,17 @@
            show-mob-hash
            hide-mob-hash
            hide-all-mobs
-           get-mob-function-name)
+           get-current-mob-id
+           get-mob-function-name
+           map-mobs)
   #:export-syntax (game
                   show-mob
                   hide-mob
                   the-mob
                   define-mob-function
                   define-mob
-                  lambda-mob)
+                  lambda-mob
+                  define-checking-mobs)
   #:re-export (get-current-color
               set-current-color
               with-color
@@ -223,11 +226,18 @@
        (else
         `(hide-mob-hash (,mob 'get-mob-id)))))
 
+(define current-mob-id #f)
+
+(define (get-current-mob-id)
+  current-mob-id)
+
 (define* (run-mobs #:optional (mobs (get-active-mobs)))
   (for-each
    (lambda (m)
+     (set! current-mob-id (m 'get-mob-id))
      (glmatrix-block (m)))
-   mobs))
+   mobs)
+  (set! current-mob-id #f))
 
 
 ;;; Making mobs
@@ -241,49 +251,47 @@
           (hash-set! mob-functions mob-name name)))
     name))
 
-(define-macro (the-mob type attr publish fun-name)
-  (let ((mob-id-symbol (gensym))
-       (type-symbol (gensym))
-       (time-symbol (gensym))
-       (data-symbol (gensym)))
-    `(let ((,mob-id-symbol (gensym))
-          (,type-symbol ,type)
-          (,time-symbol 0)
-          (,data-symbol '())
-          ,@attr)
-       (lambda* (#:optional (option #f))
-        (define (kill-me)
-          (hide-mob-hash ,mob-id-symbol))
-        (define (save-data)
-          (let ((time (get-frame-time)))
-            (cond ((not (= time ,time-symbol))
-                   (set! ,time-symbol time)
-                   (set! ,data-symbol ,(cons 'list (map (lambda (x) `(cons ',(car x) ,(car x))) publish)))))))
-        (define (get-data)
-          ,data-symbol)
-        (define (filter-mobs type fun)
-          #t)
-        (define (map-mobs fun type)
-          (let ((mobs (filter (lambda (m) (and (eq? (m 'get-type) type) (not (eq? (m 'get-mob-id) ,mob-id-symbol)))) (get-active-mobs))))
-            (map (lambda (m) (fun (m 'get-data))) mobs)))
-        (case option
-          ((get-mob-id)
-           ,mob-id-symbol)
-          ((get-type)
-           ,type-symbol)
-          ((get-data)
-           (save-data)
-           ,data-symbol)
-          (else
-           (save-data)
-           (,fun-name 123)))))))
+(define-macro (the-mob type init-data fun-name)
+  `(let ((mob-id (gensym))
+        (mob-time 0)
+        (mob-data ,init-data)
+        (saved-data ,init-data))
+     (lambda* (#:optional (option #f))
+       (define (save-data)
+        (let ((time (get-frame-time)))
+          (cond ((not (= time mob-time))
+                 (set! mob-time time)
+                 (set! saved-data mob-data)))))
+       (case option
+        ((get-mob-id)
+         mob-id)
+        ((get-type)
+         ,type)
+        ((get-data)
+         (save-data)
+         saved-data)
+        (else
+         (save-data)
+         (set! mob-data (,fun-name mob-id mob-data)))))))
 
 (define-macro (define-mob-function head . body)
-  (let ((fun-name (car head)) (attr (cdr head)))
-    `(define (,fun-name data)
-       (catch #t
-             (lambda* () ,@body)
-             (lambda (key . args) #f))))
+  (let ((fun-name (car head))
+       (attr (map (lambda (a) (if (list? a) a (list a #f))) (cdr head)))
+       (mob-id-symbol (gensym))
+       (data-symbol (gensym)))
+    `(define (,fun-name ,mob-id-symbol ,data-symbol)
+       (define (kill-me)
+        (hide-mob-hash ,mob-id-symbol))
+       (let ,attr
+        ,@(map
+           (lambda (a)
+             `(let ((val (assoc-ref ,data-symbol ',(car a))))
+                (cond (val (set! ,(car a) val)))))
+           attr)
+        (catch #t
+               (lambda* () ,@body)
+               (lambda (key . args) #f))
+        (list ,@(map (lambda (a) `(cons ',(car a) ,(car a))) attr))))))
 
 (define-macro (define-mob mob-head . body)
   (let* ((name (car mob-head)) (attr (cdr mob-head))
@@ -292,23 +300,26 @@
        (define-mob-function ,(cons fun-name attr) ,@body)
        (define ,(string->symbol (string-concatenate (list "make-" (symbol->string name))))
         (lambda* ,(if (null? attr) '() `(#:key ,@attr))
-          (the-mob ',name () ,attr ,fun-name))))))
+          (the-mob ',name (list ,@(map (lambda (a) `(cons ',(car a) ,(car a))) attr)) ,fun-name))))))
 
 (define-macro (lambda-mob attr . body)
   (let ((fun-name (gensym)))
     `(begin
        (define-mob-function ,(cons fun-name attr) ,@body)
-       (the-mob 'undefined ,attr '() ,fun-name))))
+       (the-mob 'undefined '() ,fun-name))))
 
 
-;;; Collisions
+;;; Functions for checking mobs (collisions and more)
 
-;; (define-macro (lambda-mob-data attr . body)
-;;   `(lambda ,attr ,@body))
+(define (map-mobs fun type)
+  (let ((mobs (filter (lambda (m) (and (eq? (m 'get-type) type) (not (eq? (m 'get-mob-id) (get-current-mob-id))))) (get-active-mobs))))
+    (map (lambda (m) (fun (m 'get-data))) mobs)))
 
-;; (define-macro (define-collision-check name mobs . body)
-;;   `(defmacro* ,name (#:optional m)
-;;      `(let ,(cond (m `((mob-id (,m 'get-mob-id)) (mob-type (,m 'get-type))))
-;;               (else `()))
-       
-;;     mob-id)))
+(define-macro (define-checking-mobs head mob-def . body)
+  (let ((type (car mob-def)) (attr (cdr mob-def)))
+    `(define ,head
+       (map-mobs
+       (lambda (m)
+         (let ,(map (lambda (a) `(,(car a) (assoc-ref m ',(cadr a)))) attr)
+           ,@body))
+       ',type))))