Revision 5:0136aae4f1ff, committed 2014-09-26

Comitter:

jn80842

Date:

Fri Sep 26 23:05:10 2014 +0000

Parent:

4:612f7d5a822d

Commit message:

compatibility

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vector.cpp	Fri Sep 26 23:05:10 2014 +0000
@@ -0,0 +1,22 @@
+#include <vector.h>
+#include <math.h>
+
+void vector_cross(const vector *a,const vector *b, vector *out)
+{
+  out->x = a->y*b->z - a->z*b->y;
+  out->y = a->z*b->x - a->x*b->z;
+  out->z = a->x*b->y - a->y*b->x;
+}
+
+float vector_dot(const vector *a,const vector *b)
+{
+  return a->x*b->x+a->y*b->y+a->z*b->z;
+}
+
+void vector_normalize(vector *a)
+{
+  float mag = sqrt(vector_dot(a,a));
+  a->x /= mag;
+  a->y /= mag;
+  a->z /= mag;
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vector.h	Fri Sep 26 23:05:10 2014 +0000
@@ -0,0 +1,11 @@
+#ifndef vector_h
+#define vector_h
+typedef struct vector
+{
+  float x, y, z;
+} vector;
+
+extern void vector_cross(const vector *a, const vector *b, vector *out);
+extern float vector_dot(const vector *a,const vector *b);
+extern void vector_normalize(vector *a);
+#endif
\ No newline at end of file