1 files changed, 10 insertions, 0 deletions
diff --git a/helper.c b/helper.c
new file mode 100644
index 0000000..9920c5d
--- /dev/null
+++ b/helper.c
@@ -0,0 +1,10 @@
+#include <math.h>
+#include "header.h"
+
+double map_range(double x, double src_lo, double src_hi, double dest_lo, double dest_hi)
+{
+    double src_len = fabs(src_hi - src_lo);
+    double dest_len = fabs(dest_hi - dest_lo);
+
+    return (x - src_lo) / src_len * dest_len + dest_lo;
+}