Add procedures to perform a gl-translate or gl-scale given a vector2 object.

2 files changed, 20 insertions, 9 deletions

diff --git a/2d/font.scm b/2d/font.scm
index 45b59d0..182f25b 100644
--- a/2d/font.scm
+++ b/2d/font.scm
@@ -95,14 +95,13 @@ upper-left corner rather than the bottom-left."
     (%make-textbox font text position color alignment line-length layout)))
 
 (define (draw-textbox textbox)
-  (let ((pos (textbox-position textbox)))
-    (with-gl-push-matrix
-      (gl-translate (vx pos) (vy pos) 0)
-      (flip-text (textbox-font textbox))
-      (apply-color (textbox-color textbox))
-      (ftgl-render-layout (textbox-layout textbox)
-                          (textbox-text textbox)
-                          (ftgl-render-mode all)))))
+  (with-gl-push-matrix
+    (vector2-translate (textbox-position textbox))
+    (flip-text (textbox-font textbox))
+    (apply-color (textbox-color textbox))
+    (ftgl-render-layout (textbox-layout textbox)
+                        (textbox-text textbox)
+                        (ftgl-render-mode all))))
 
 (export <textbox>
         make-textbox
diff --git a/2d/vector2.scm b/2d/vector2.scm
index 7720095..d231f93 100644
--- a/2d/vector2.scm
+++ b/2d/vector2.scm
@@ -22,6 +22,7 @@
 ;;; Code:
 
 (define-module (2d vector2)
+  #:use-module (figl gl)
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-9)
   #:export (<vector2>
@@ -38,7 +39,9 @@
             vmag
             vnorm
             vdot
-            vcross))
+            vcross
+            vector2-translate
+            vector2-scale))
 
 (define-record-type <vector2>
   (vector2 x y)
@@ -105,3 +108,12 @@ vector is not defined. This function instead returns the Z coordinate
 of the cross product as if the vectors were in 3D space."
   (- (* (vx v1) (vy v2))
      (* (vy v1) (vx v2))))
+
+(define (vector2-translate v)
+  "Perform an OpenGL translate matrix operation with the given
+vector2."
+  (gl-translate (vx v) (vy v) 0))
+
+(define (vector2-scale v)
+  "Perform an OpenGL scale matrix operation with the given vector2."
+  (gl-scale (vx v) (vy v) 1))