Add sane default canvas view.

Cuts down on boilerplate that the user needs to write.

1 files changed, 14 insertions, 1 deletions

diff --git a/starling/node-2d.scm b/starling/node-2d.scm
index c0cb243..a0b2746 100644
--- a/starling/node-2d.scm
+++ b/starling/node-2d.scm
@@ -33,7 +33,9 @@
   #:use-module (chickadee render texture)
   #:use-module (chickadee render viewport)
   #:use-module (chickadee scripting)
+  #:use-module (ice-9 match)
   #:use-module (oop goops)
+  #:use-module (sdl2 video)
   #:use-module (starling asset)
   #:use-module (starling kernel)
   #:use-module (starling node)
@@ -175,8 +177,19 @@
 ;; The canvas is the root of a 2D scene.  It handles rendering one or
 ;; more views.
 
+(define (make-default-views)
+  (match (window-size (window (current-kernel)))
+    ((width height)
+     (list
+      (make <view-2d>
+        #:camera (make <camera-2d>
+                   #:width width
+                   #:height height)
+        #:area (make-rect 0 0 width height))))))
+
 (define-class <canvas> (<node>)
-  (views #:accessor views #:init-form '() #:init-keyword #:views))
+  (views #:accessor views #:init-thunk make-default-views
+         #:init-keyword #:views))
 
 (define-method (update (canvas <canvas>) dt)
   (for-each (lambda (view)