From b5bc4b9fdfd72a3f35b78c138836b963b0883d06 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Fri, 26 Mar 2021 22:53:47 -0400
Subject: ball: Move spinning balls

---
diff --git a/src/ball.c b/src/ball.c
index 862efc4..1386cfd 100644
--- a/src/ball.c
+++ b/src/ball.c
@@ -77,6 +77,23 @@ db_ball_new(int x, int y, int r, int a, int d, int sr, double s,
 }
 
 void
+db_balls_move(struct db_ball *ball)
+{
+	if (ball->sr == 0) {
+	} else {
+		ball->a += ball->d * ball->s;
+		ball->x  = ball->cx + cos(ball->a * (M_PI / 180)) * ball->sr;
+		ball->y  = ball->cy - sin(ball->a * (M_PI / 180)) * ball->sr;
+		db_dbg("Spinning ball angle %f (speed %f, direction %d)",
+				ball->a, ball->s, ball->d);
+	}
+
+	if (ball->next != NULL) {
+		db_balls_move(ball->next);
+	}
+}
+
+void
 db_balls_collisions(struct db_ball *ball)
 {
 	struct db_ball *other;
diff --git a/src/ball.h b/src/ball.h
index 45058bc..bcb75c4 100644
--- a/src/ball.h
+++ b/src/ball.h
@@ -26,6 +26,7 @@ struct db_ball;
 
 struct db_ball *db_ball_new(int x, int y, int r, int a, int d, int sr, double s,
 		struct db_tileset *tilesets, int gid, struct db_ball *prev);
+void db_balls_move(struct db_ball *ball);
 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)
diff --git a/src/level.c b/src/level.c
index 8c6a1bd..b8dc618 100644
--- a/src/level.c
+++ b/src/level.c
@@ -137,6 +137,7 @@ db_level_play(SDL_Renderer *renderer, struct db_level *level)
 					break;
 			}
 		}
+		db_balls_move(level->balls);
 		_db_level_render(renderer, level);
 		cur_ticks = SDL_GetTicks();
 		if ((Uint32) (1000 / fr) > (cur_ticks - prv_ticks)) {
--
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