From d1e94994f75466ab207322f59847ac0f359f46b8 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@gmail.com>
Date: Tue, 18 May 2010 11:02:46 -0600
Subject: New dmnsn_vector_element() function.

---
 libdimension/dimension/geometry.h | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'libdimension')

diff --git a/libdimension/dimension/geometry.h b/libdimension/dimension/geometry.h
index 6fb7c96..8e2e47c 100644
--- a/libdimension/dimension/geometry.h
+++ b/libdimension/dimension/geometry.h
@@ -101,6 +101,31 @@ dmnsn_new_line(dmnsn_vector x0, dmnsn_vector n)
   return l;
 }
 
+/* Vector element access */
+
+enum {
+  DMNSN_X,
+  DMNSN_Y,
+  DMNSN_Z
+};
+
+DMNSN_INLINE double
+dmnsn_vector_element(dmnsn_vector n, int elem)
+{
+  switch (elem) {
+  case DMNSN_X:
+    return n.x;
+  case DMNSN_Y:
+    return n.y;
+  case DMNSN_Z:
+    return n.z;
+
+  default:
+    dmnsn_assert(false, "Wrong vector element requested.");
+    return 0.0; /* Shut up compiler */
+  }
+}
+
 /* Vector and matrix arithmetic */
 
 DMNSN_INLINE dmnsn_vector
-- 
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