check font

[guile-irrlicht.git] / irrlicht / gui.scm

diff --git a/irrlicht/gui.scm b/irrlicht/gui.scm
index 7d1819e021712f7fb94fbf9aa9123880cef1b5a9..65b24bb8d2103ed2bc5de27881543b60c7755ceb 100644 (file)
--- a/irrlicht/gui.scm
+++ b/irrlicht/gui.scm
@@ -42,7 +42,11 @@
 (define-class <gui-element> (<attribute-exchanging-object> <event-receiver>)
   (irr-class #:init-value "IGUIElement"))
 
-(export <gui-element>)
+(define-method (get-id (element <gui-element>))
+  (let ((getID (get-irrlicht-proc "getID" element)))
+    (getID element)))
+
+(export <gui-element> get-id)
 
 
 ;; IGUIEnvironment
@@ -110,8 +114,11 @@
     (getBuiltInFont gui-environment)))
 
 (define-method (get-font (gui-environment <gui-environment>) filename)
-  (let ((getFont (get-irrlicht-proc "getFont" gui-environment)))
-    (getFont gui-environment filename)))
+  (let ((getFont (get-irrlicht-proc "getFont" gui-environment))
+        (font (getFont gui-environment filename)))
+    (if (null-object? font)
+        (error "In procedure get-font: Font unavailable")
+        font)))
 
 (define-method (get-skin (gui-environment <gui-environment>))
   (let ((getSkin (get-irrlicht-proc "getSkin" gui-environment)))