1 files changed, 18 insertions, 0 deletions
diff --git a/snakegame/utils.py b/snakegame/utils.py
new file mode 100644
index 0000000..162c0b2
--- /dev/null
+++ b/snakegame/utils.py
@@ -0,0 +1,18 @@
+try:
+    from collections import OrderedDict as MaybeOrderedDict
+except ImportError:
+    MaybeOrderedDict = dict
+
+def scale_aspect((source_width, source_height), (target_width, target_height)):
+    source_aspect = float(source_width) / source_height
+    target_aspect = float(target_width) / target_height
+    if source_aspect > target_aspect:
+        # restrict width
+        width = target_width
+        height = float(width) / source_aspect
+    else:
+        # restrict height
+        height = target_height
+        width = height * source_aspect
+    return (width, height)
+