diff --git a/doomsday/libdeng1/include/de/vector1.h b/doomsday/libdeng1/include/de/vector1.h
index e0ca70ffba..f5e33134bf 100644
--- a/doomsday/libdeng1/include/de/vector1.h
+++ b/doomsday/libdeng1/include/de/vector1.h
@@ -332,8 +332,10 @@ DENG_PUBLIC void V2d_Lerp(pvec2d_t dest, const_pvec2d_t a, const_pvec2d_t b, dou
  * Left/top is the min-point.  Right/bottom is the max-point.
  */
 DENG_PUBLIC void V2d_InitBox(arvec2d_t box, const_pvec2d_t point);
+DENG_PUBLIC void V2d_InitBoxXY(arvec2d_t box, double x, double y);
 
 DENG_PUBLIC void V2d_AddToBox(arvec2d_t box, const_pvec2d_t point);
+DENG_PUBLIC void V2d_AddToBoxXY(arvec2d_t box, double x, double y);
 
 DENG_PUBLIC void V2d_UniteBox(arvec2d_t box, const_arvec2d_t other);
 
diff --git a/doomsday/libdeng1/src/vector1.c b/doomsday/libdeng1/src/vector1.c
index a34b4eef7b..8103fb1874 100644
--- a/doomsday/libdeng1/src/vector1.c
+++ b/doomsday/libdeng1/src/vector1.c
@@ -627,6 +627,12 @@ void V2d_InitBox(arvec2d_t box, const_pvec2d_t point)
     V2d_Copy(box[1], point);
 }
 
+void V2d_InitBoxXY(arvec2d_t box, double x, double y)
+{
+    vec2d_t point; V2d_Set(point, x, y);
+    V2d_InitBox(box, point);
+}
+
 void V2d_AddToBox(arvec2d_t box, const_pvec2d_t point)
 {
     if(point[VX] < box[0][VX])
@@ -640,6 +646,12 @@ void V2d_AddToBox(arvec2d_t box, const_pvec2d_t point)
         box[1][VY] = point[VY];
 }
 
+void V2d_AddToBoxXY(arvec2d_t box, double x, double y)
+{
+    vec2d_t point; V2d_Set(point, x, y);
+    V2d_AddToBox(box, point);
+}
+
 void V2d_UniteBox(arvec2d_t box, const_arvec2d_t other)
 {
     if(other[0][VX] < box[0][VX])