1 files changed, 42 insertions, 0 deletions
diff --git a/src/collision.c b/src/collision.c
new file mode 100644
index 0000000..5810c84
--- /dev/null
+++ b/src/collision.c
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2019-2020, yzrh <yzrh@noema.org>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <stdbool.h>
+
+#include <SDL2/SDL.h>
+
+#include "screen.h"
+#include "renderer.h"
+
+bool
+collision(int *a, int *b)
+{
+	if (a[0] < b[0] + b[2] &&
+		a[0] + a[2] > b[0] &&
+		a[1] < b[1] + b[3] &&
+		a[1] + a[3] > b[1])
+		return 1;
+	return 0;
+}
+
+bool
+collision_block(int *a, int *b)
+{
+	return collision(
+		(int[]) {a[0], a[1], SCREEN_UNIT, SCREEN_UNIT},
+		(int[]) {b[0], b[1], SCREEN_UNIT, SCREEN_UNIT});
+}
+
+bool
+collision_bound(float x, float y, Snake_Text *message)
+{
+	if (x > message->pos.x &&
+		x < message->pos.x + message->pos.w &&
+		y > message->pos.y &&
+		y < message->pos.y + message->pos.h)
+		return 1;
+	return 0;
+}