From d97f66ef26c89c8bd805cdeafffa959c91ec278b Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pjm@nac.net>
Date: Tue, 21 May 2013 17:50:37 -0400
Subject: Add (stationary and invisible) balls to the board.

---
diff --git a/src/ball.c b/src/ball.c
new file mode 100644
index 0000000..7484950
--- /dev/null
+++ b/src/ball.c
@@ -0,0 +1,19 @@
+#include <stdlib.h>
+
+#include "ball.h"
+
+struct ball *
+new_ball(int x, int y)
+{
+	struct ball *b;
+
+	b = malloc(sizeof(*b));
+	if (b == NULL) {
+		return NULL;
+	}
+
+	b->x = x;
+	b->y = y;
+
+	return b;
+}
diff --git a/src/ball.h b/src/ball.h
new file mode 100644
index 0000000..c2be172
--- /dev/null
+++ b/src/ball.h
@@ -0,0 +1,17 @@
+#ifndef BALL_H
+#define BALL_H
+
+#include "board.h"
+
+static const int BALL_START_X_NORMAL = 40;
+static const int BALL_START_Y_NORMAL = 12;
+
+struct ball {
+	int x;
+	int y;
+	struct ball *next;
+};
+
+struct ball *new_ball(int x, int y);
+
+#endif
diff --git a/src/game.c b/src/game.c
index 9f7cebd..a5ae342 100644
--- a/src/game.c
+++ b/src/game.c
@@ -12,7 +12,7 @@ static void update(struct game *g);
 static void draw(struct game *g);
 
 struct game *
-new_game(void)
+new_game(char balls)
 {
 	struct game *g;
 
@@ -23,6 +23,8 @@ new_game(void)
 
 	g->players[0] = new_player(0);
 	g->players[1] = new_player(1);
+	g->min_balls = balls;
+	g->cur_balls = 0;
 
 	return g;
 }
@@ -91,10 +93,19 @@ input(struct game *g)
 static void
 update(struct game *g)
 {
+	struct ball *b;
+
 	update_paddle(&g->players[0]->paddle_h);
 	update_paddle(&g->players[0]->paddle_v);
 	update_paddle(&g->players[1]->paddle_h);
 	update_paddle(&g->players[1]->paddle_v);
+
+	while (g->cur_balls < g->min_balls) {
+		b = new_ball(BALL_START_X_NORMAL, BALL_START_Y_NORMAL);
+		b->next = g->balls_head;
+		g->balls_head = b;
+		++g->cur_balls;
+	}
 }
 
 static void
diff --git a/src/game.h b/src/game.h
index 9a0f096..25d509b 100644
--- a/src/game.h
+++ b/src/game.h
@@ -2,13 +2,17 @@
 #define GAME_H
 
 #include "player.h"
+#include "ball.h"
 
 struct game {
 	struct player *players[2];
 	char running;
+	char min_balls;
+	char cur_balls;
+	struct ball *balls_head;
 };
 
-struct game *new_game(void);
+struct game *new_game(char balls);
 void free_game(struct game *g);
 void run_game(struct game *g);
 
diff --git a/src/local.mk b/src/local.mk
index 3f3338d..778f34c 100644
--- a/src/local.mk
+++ b/src/local.mk
@@ -2,4 +2,5 @@ src_SOURCES = \
 	src/main.c \
 	src/game.c \
 	src/player.c \
-	src/paddle.c
+	src/paddle.c \
+	src/ball.c
diff --git a/src/main.c b/src/main.c
index 408f47b..1034b2a 100644
--- a/src/main.c
+++ b/src/main.c
@@ -11,7 +11,7 @@ main(void)
 	struct game *g;
 
 	init_curses();
-	g = new_game();
+	g = new_game(1);
 
 	run_game(g);
 
--
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