1 files changed, 21 insertions, 0 deletions
diff --git a/lib/vec2.c b/lib/vec2.c
index b417e9c..d795d50 100644
--- a/lib/vec2.c
+++ b/lib/vec2.c
@@ -1,9 +1,16 @@
+#include <assert.h>
+#include <math.h>
+
 #include "types.h"
 
 vec2
 dp_vec2_new(float x, float y)
 {
 	vec2 new;
+	
+	assert(isfinite(x));
+	assert(isfinite(y));
+
 	new.x = x;
 	new.y = y;
 	return new;
@@ -44,3 +51,17 @@ dp_vec2_dot(vec2 a, vec2 b)
 	dot.y = a.y * b.y;
 	return dot;
 }
+
+float
+dp_vec2_length(vec2 v)
+{
+	return sqrtf(powf(v.x, 2.f) + powf(v.y, 2.f));
+}
+
+vec2
+dp_vec2_normal(vec2 v)
+{
+	float a;
+	a = 1.f / dp_vec2_length(v);
+	return dp_vec2_mul(v, a);
+}