From cb7efa200cd2699f930d991902d0ad652f599e69 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pjm@nac.net>
Date: Mon, 20 May 2013 20:41:06 -0400
Subject: Make paddles unstoppable!

---
diff --git a/src/game.c b/src/game.c
index 83d803c..86b7be6 100644
--- a/src/game.c
+++ b/src/game.c
@@ -7,6 +7,7 @@
 static void draw_paddles(struct game *g);
 static void wait(struct game *g);
 static void input(struct game *g);
+static void update(struct game *g);
 static void draw(struct game *g);
 
 struct game *
@@ -42,6 +43,7 @@ run_game(struct game *g)
 	while (g->running) {
 		wait(g);
 		input(g);
+		update(g);
 		draw(g);
 	}
 }
@@ -56,8 +58,6 @@ static void
 input(struct game *g)
 {
 	int c;
-	struct paddle *pad;
-	int dir;
 
 	timeout(0);
 	for (;;) {
@@ -67,34 +67,48 @@ input(struct game *g)
 		} else if (c == ERR) {
 			break;
 		} else if (c == KEY_LEFT) {
-			pad = &g->players[0]->paddle_h;
-			dir = -1;
-			if (pad->pos > pad->size / 2 + 3) {
-				pad->pos += pad->speed * dir;
-			}
+			g->players[0]->paddle_h.dir = -1;
 		} else if (c == KEY_RIGHT) {
-			pad = &g->players[0]->paddle_h;
-			dir = 1;
-			if (pad->pos < 77 - pad->size / 2) {
-				pad->pos += pad->speed * dir;
-			}
+			g->players[0]->paddle_h.dir = 1;
 		} else if (c == KEY_UP) {
-			pad = &g->players[0]->paddle_v;
-			dir = -1;
-			if (pad->pos > pad->size / 2 + 2) {
-				pad->pos += pad->speed * dir;
-			}
+			g->players[0]->paddle_v.dir = -1;
 		} else if (c == KEY_DOWN) {
-			pad = &g->players[0]->paddle_v;
-			dir = 1;
-			if (pad->pos < 23 - pad->size / 2) {
-				pad->pos += pad->speed * dir;
-			}
+			g->players[0]->paddle_v.dir = 1;
 		}
 	}
 }
 
 static void
+update(struct game *g)
+{
+	struct paddle *pad;
+
+	/* Player 1 horizontal paddle */
+	pad = &g->players[0]->paddle_h;
+	pad->pos += pad->speed * pad->dir;
+	if (pad->pos < pad->size / 2 + 2)  pad->pos = pad->size / 2 + 2;
+	if (pad->pos > 78 - pad->size / 2) pad->pos = 78 - pad->size / 2;
+
+	/* Player 1 vertical paddle */
+	pad = &g->players[0]->paddle_v;
+	pad->pos += pad->speed * pad->dir;
+	if (pad->pos < pad->size / 2 + 2)  pad->pos = pad->size / 2 + 2;
+	if (pad->pos > 23 - pad->size / 2) pad->pos = 23 - pad->size / 2;
+
+	/* Player 2 horizontal paddle */
+	pad = &g->players[1]->paddle_h;
+	pad->pos += pad->speed * pad->dir;
+	if (pad->pos < pad->size / 2 + 2)  pad->pos = pad->size / 2 + 2;
+	if (pad->pos > 78 - pad->size / 2) pad->pos = 78 - pad->size / 2;
+
+	/* Player 2 vertical paddle */
+	pad = &g->players[1]->paddle_v;
+	pad->pos += pad->speed * pad->dir;
+	if (pad->pos < pad->size / 2 + 2)  pad->pos = pad->size / 2 + 2;
+	if (pad->pos > 23 - pad->size / 2) pad->pos = 23 - pad->size / 2;
+}
+
+static void
 draw(struct game *g)
 {
 	draw_paddles(g);
diff --git a/src/paddle.h b/src/paddle.h
index 9b4bdc7..5f7de67 100644
--- a/src/paddle.h
+++ b/src/paddle.h
@@ -12,6 +12,7 @@ struct paddle {
 	int pos;
 	int size;
 	int speed;
+	int dir;
 };
 
 #endif
diff --git a/src/player.c b/src/player.c
index 58ef6b5..a0cf7bb 100644
--- a/src/player.c
+++ b/src/player.c
@@ -20,6 +20,8 @@ new_player(void)
 	p->paddle_v.size = PADDLE_V_SIZE_NORMAL;
 	p->paddle_h.speed = PADDLE_H_SPEED_NORMAL;
 	p->paddle_v.speed = PADDLE_V_SPEED_NORMAL;
+	p->paddle_h.dir = 0;
+	p->paddle_v.dir = 0;
 
 	return p;
 }
--
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