*work in progress*

[winnie] / src / geom.cc

diff --git a/src/geom.cc b/src/geom.cc
new file mode 100644 (file)
index 0000000..c9d5c51
--- /dev/null
+++ b/src/geom.cc
@@ -0,0 +1,33 @@
+#include "geom.h"
+
+static inline int min(int x, int y)
+{
+       return x < y ? x : y;
+}
+
+static inline int max(int x, int y)
+{
+       return x > y ? x : y;
+}
+
+Rect rect_union(const Rect &a, const Rect &b)
+{
+       Rect uni;
+       uni.x = min(a.x, b.x);
+       uni.y = min(a.y, b.y);
+       uni.width = max(a.x + a.width, b.x + b.width) - uni.x;
+       uni.height = max(a.y + a.height, b.y + b.height) - uni.y;
+
+       return uni;
+}
+
+Rect rect_intersection(const Rect &a, const Rect &b)
+{
+       Rect intersect;
+       intersect.x = max(a.x, b.x);
+       intersect.y = max(a.y, b.y);
+       intersect.width = max(min(a.x + a.width, b.x + b.width) - intersect.x, 0);
+       intersect.height = max(min(a.y + a.height, b.y + b.height) - intersect.y, 0);
+
+       return intersect;
+}