From 68e7e8a48161b5e5e93bcafac3c54880217f2708 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Thu, 25 Mar 2021 07:40:44 -0400
Subject: ball: New functions

---
(limited to 'src')

diff --git a/src/ball.c b/src/ball.c
new file mode 100644
index 0000000..8a00d7d
--- /dev/null
+++ b/src/ball.c
@@ -0,0 +1,97 @@
+/*
+ * 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 <stdlib.h>
+#include "ball.h"
+#include "collision.h"
+#include "output.h"
+
+struct db_ball {
+	int             x;
+	int             y;
+	int             r;
+	int             a;
+	int             s;
+	struct db_ball *next;
+};
+
+struct db_ball *
+db_ball_new(int x, int y, int r, int a, int s, struct db_ball *prev)
+{
+	struct db_ball *ball;
+
+	ball = calloc(1, sizeof(*ball));
+	if (ball == NULL) {
+		db_err("Failed to allocate memory");
+		return NULL;
+	}
+
+	ball->x = x;
+	ball->y = y;
+	ball->r = r;
+	ball->a = a;
+	ball->s = s;
+
+	if (prev != NULL) {
+		prev->next = ball;
+	}
+
+	return ball;
+}
+
+static void
+_db_ball_collisions(struct db_ball *this)
+{
+	struct db_ball *that;
+	int             col_x;
+	int             col_y;
+
+	for (that = this->next; that != NULL; that = that->next) {
+		if (db_col_pt_cir_cir(this->x, this->y, this->r,
+					that->x, that->y, that->r,
+					&col_x, &col_y)) {
+			/* TODO: Reverse direction */
+		}
+	}
+}
+
+void
+db_balls_collisions(struct db_ball *ball_head)
+{
+	struct db_ball *ball;
+
+	for (ball = ball_head; ball != NULL; ball = ball->next) {
+		_db_ball_collisions(ball);
+	}
+}
+
+int
+db_balls_player_collisions(struct db_ball *ball_head,
+		int player_x, int player_y, int player_r)
+{
+	struct db_ball *ball;
+
+	for (ball = ball_head; ball != NULL; ball = ball->next) {
+		if (db_col_cir_cir(ball->x, ball->y, ball->r,
+					player_x, player_y, player_r)) {
+			return 1;
+		}
+	}
+	return 0;
+}
diff --git a/src/ball.h b/src/ball.h
new file mode 100644
index 0000000..045cb22
--- /dev/null
+++ b/src/ball.h
@@ -0,0 +1,32 @@
+/*
+ * 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_BALL_H_
+#define DB_BALL_H_
+
+struct db_ball;
+
+struct db_ball *db_ball_new(int x, int y, int r, int a, int s,
+		struct db_ball *prev);
+void db_balls_collisions(struct db_ball *ball_head);
+int db_balls_player_collisions(struct db_ball *ball_head,
+		int player_x, int player_y, int player_r)
+	__attribute__((__pure__));
+
+#endif  /* DB_BALL_H_ */
diff --git a/src/local.mk b/src/local.mk
index c0c83dd..19a90c6 100644
--- a/src/local.mk
+++ b/src/local.mk
@@ -1,4 +1,6 @@
 dodge_balls_SOURCES += \
+	%reldir%/ball.c \
+	%reldir%/ball.h \
 	%reldir%/base64.c \
 	%reldir%/base64.h \
 	%reldir%/collision.c \
--
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