diff --git a/src/WindowContext.zig b/src/WindowContext.zig
index 9e14d05..a702416 100644
--- a/src/WindowContext.zig
+++ b/src/WindowContext.zig
@@ -16,15 +16,10 @@ pub const OpenDocument = struct {
     selected_object_id: ?u64 = null,
 
     pub fn init(allocator: std.mem.Allocator, self: *OpenDocument) void {
-        const default_size = basic_models.Size_f{ .w = 800, .h = 600 };
-        self.document = Document.init(default_size);
-        self.cpu_render = CpuRenderEngine.init(allocator, .Squares);
-        self.canvas = Canvas.init(
-            allocator,
-            &self.document,
-            (&self.cpu_render).renderEngine(),
-        );
-        self.selected_object_id = null;
+        initWithDocument(allocator, self, .init(.{
+            .w = 800,
+            .h = 600,
+        }));
     }
 
     pub fn initWithDocument(allocator: std.mem.Allocator, self: *OpenDocument, doc: Document) void {