Functions for playing with arguments when apply to procedures.

[gacela.git] / src / views.scm

diff --git a/src/views.scm b/src/views.scm
index 5fcf8549f22218bdd364ed5e2eb11bcc9cd48dfa..c19bf338100064fbf0eda3d5f842f18c2adeeac0 100644 (file)
--- a/src/views.scm
+++ b/src/views.scm
@@ -26,21 +26,96 @@
      (hash-set! active-views ',name (lambda () (video:glmatrix-block ,content)))
      ',name))
 
-(define-macro (lambda-mesh . content)
-  `(lambda () ,content))
+(define (mesh primitive)
+  (let ((x 0) (y 0) (z 0)
+       (ax 0) (ay 0) (az 0)
+       (rx 0) (ry 0) (rz 0)
+       (id (gensym))
+       (properties '()))
+    (let ((inner-properties
+          (lambda ()
+            `((id . ,id) (x . ,x) (y . ,y) (z . ,z) (ax . ,ax) (ay . ,ay) (az . ,az) (rx . ,rx) (ry . ,ry) (rz . ,rz)))))
+      (lambda (option . params)
+       (case option
+         ((draw)
+          (video:glmatrix-block
+           (video:rotate ax ay az)
+           (video:translate x y z)
+           (video:rotate rx ry rz)
+           (primitive (assoc-ref properties 'args))))
+         ((translate)
+          (set! x (+ x (car params)))
+          (set! y (+ y (cadr params)))
+          (set! z (+ z (caddr params))))
+         ((turn)
+          (set! ax (+ ax (car params)))
+          (set! ay (+ ay (cadr params)))
+          (set! az (+ az (caddr params))))
+         ((rotate)
+          (set! rx (+ rx (car params)))
+          (set! ry (+ ry (cadr params)))
+          (set! rz (+ rz (caddr params))))
+         ((inner-properties)
+          (inner-properties))
+         ((inner-property)
+          (assoc-ref (inner-properties) (car params)))
+         ((properties)
+          properties)
+         ((property)
+          (assoc-ref properties (car params)))
+         ((property-set!)
+          (set! properties (assoc-set! properties (car params) (cadr params)))))))))
 
-(define-macro (define-basic-meshes . symbols)
+(define* (show mesh #:optional (view default-view))
+  (let ((id (mesh 'inner-property 'id)))
+    (if (not (hash-ref view id))
+       (hash-set! view id mesh))))
+
+(define* (hide mesh #:optional (view default-view))
+  (hash-remove! view (mesh 'inner-property 'id)))
+
+(define* (translate mesh x y #:optional (z 0))
+  (mesh 'translate x y z)
+  mesh)
+
+(define (turn mesh . params)
+  (if (>= (length params) 3)
+      (apply mesh (cons 'turn params))
+      (mesh 'turn 0 0 (car params)))
+  mesh)
+
+(define (rotate mesh . params)
+  (if (>= (length params) 3)
+      (apply mesh (cons 'rotate params))
+      (mesh 'rotate 0 0 (car params)))
+  mesh)
+
+
+;;; Primitives
+
+(define-macro (primitive proc)
+  `(lambda (. params)
+     (let ((m (mesh (lambda (args) (apply ,proc args)))))
+       (m 'property-set! 'args params)
+       m)))
+
+(define-macro (define-primitives . symbols)
   (cond ((null? symbols)
         `#t)
        (else
-        `(begin
-           (define (,(caar symbols) . params) (lambda-visible (video:glmatrix-block (apply ,(cadar symbols) params))))
-           (define-basic-meshes ,@(cdr symbols))))))
+        (let ((origin (caar symbols))
+              (dest (cadar symbols)))
+          `(begin
+             ,(if (and (list? origin) (list? dest))
+                  `(define* ,origin #f)
+                  `(define (,origin . params) (mesh (lambda () (apply ,dest params)))))
+             (define-primitives ,@(cdr symbols)))))))
 
-(define-basic-meshes
+(define-primitives
   (rectangle video:draw-rectangle)
   (square video:draw-square))
 
+
 (module-map (lambda (sym var)
              (if (not (eq? sym '%module-public-interface))
                  (module-export! (current-module) (list sym))))