Add killing enemies.

1 files changed, 25 insertions, 0 deletions

diff --git a/rect.c b/rect.c
index ec755e2..aafa645 100644
--- a/rect.c
+++ b/rect.c
@@ -8,3 +8,28 @@ Rectangle make_rect(int x, int y, int w, int h) {
 	r.h = h;
 	return r;
 }
+
+int rects_overlap(const Rectangle* a, const Rectangle* b) {
+	return
+		a->x + a->w > b->x &&
+		a->y + a->h > b->y &&
+		a->x < b->x + b->w &&
+		a->y < b->y + b->h;
+}
+
+int rects_overlap2(
+	int x0,
+	int y0,
+	int w0,
+	int h0,
+	int x1,
+	int y1,
+	int w1,
+	int h1
+) {
+	return
+		x0 + w0 > x1 &&
+		y0 + h0 > y1 &&
+		x0 < x1 + w1 &&
+		y0 < y1 + h1;
+}