db_pt_in_rect(): New function

3 files changed, 67 insertions, 0 deletions

diff --git a/src/collision.c b/src/collision.c
new file mode 100644
index 0000000..32c5e57
--- /dev/null
+++ b/src/collision.c
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2021  P. J. McDermott
+ *
+ * This file is part of Dodge Balls
+ *
+ * Dodge Balls is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Dodge Balls is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Dodge Balls.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <SDL.h>
+
+int
+db_pt_in_rect(int x, int y, SDL_Rect *rect)
+{
+	if (x < rect->x) {
+		return 0;
+	}
+	if (y < rect->y) {
+		return 0;
+	}
+	if (x > rect->x + rect->w) {
+		return 0;
+	}
+	if (y > rect->y + rect->h) {
+		return 0;
+	}
+	return 1;
+}
diff --git a/src/collision.h b/src/collision.h
new file mode 100644
index 0000000..022cf78
--- /dev/null
+++ b/src/collision.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2021  P. J. McDermott
+ *
+ * This file is part of Dodge Balls
+ *
+ * Dodge Balls is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Dodge Balls is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Dodge Balls.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef DB_COLLISION_H_
+#define DB_COLLISION_H_
+
+#include <SDL.h>
+
+int db_pt_in_rect(int x, int y, SDL_Rect *rect);
+
+#endif  /* DB_COLLISION_H_ */
diff --git a/src/local.mk b/src/local.mk
index fbec287..922064f 100644
--- a/src/local.mk
+++ b/src/local.mk
@@ -1,4 +1,6 @@
 dodge_balls_SOURCES += \
+	%reldir%/collision.c \
+	%reldir%/collision.h \
 	%reldir%/game.c \
 	%reldir%/game.h \
 	%reldir%/locale.c \