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author | P. J. McDermott <pj@pehjota.net> | 2021-03-27 18:14:52 (EDT) |
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committer | P. J. McDermott <pj@pehjota.net> | 2021-03-27 18:24:50 (EDT) |
commit | 864e053487967faa7dd51709df1869d87544b64f (patch) | |
tree | 42f94b077a3587579861f5cc80e2384dd52bf2e6 /src | |
parent | 4a539a2210b90f4580adb46f9f8df7da2a391c29 (diff) | |
download | dodge-balls-864e053487967faa7dd51709df1869d87544b64f.zip dodge-balls-864e053487967faa7dd51709df1869d87544b64f.tar.gz dodge-balls-864e053487967faa7dd51709df1869d87544b64f.tar.bz2 |
ball: Avoid colliding with multiple coaxial walls
Diffstat (limited to 'src')
-rw-r--r-- | src/ball.c | 27 |
1 files changed, 26 insertions, 1 deletions
@@ -118,11 +118,13 @@ db_balls_collisions(struct db_ball *ball) int x_max; int y_min; int y_max; + int prev_col_x[2]; + int prev_col_y[2]; int x; int y; - struct db_ball *other; double col_x; double col_y; + struct db_ball *other; wall.w = map_tw = db_map_get_tilewidth (ball->map); wall.h = map_th = db_map_get_tileheight(ball->map); @@ -130,6 +132,10 @@ db_balls_collisions(struct db_ball *ball) x_max = ceil ((ball->x + ball->r) / map_tw); y_min = floor((ball->y - ball->r) / map_th); y_max = ceil ((ball->y + ball->r) / map_th); + prev_col_x[0] = -1; + prev_col_x[1] = -1; + prev_col_y[0] = -1; + prev_col_y[1] = -1; for (y = y_min; y < y_max; ++y) { for (x = x_min; x < x_max; ++x) { if (db_map_tile_ball_collides(ball->map, x, y)) { @@ -137,7 +143,26 @@ db_balls_collisions(struct db_ball *ball) wall.y = y * map_th; if (db_col_cir_rect(ball->x, ball->y, ball->r, &wall, &col_x, &col_y)){ + if (x == prev_col_x[0]) { + continue; + } else if (x == prev_col_x[1]) { + continue; + } else if (y == prev_col_y[0]) { + continue; + } else if (y == prev_col_y[1]) { + continue; + } _db_ball_bounce(ball, col_x, col_y); + if (prev_col_x[0] >= 0) { + prev_col_x[0] = x; + } else { + prev_col_x[1] = x; + } + if (prev_col_y[0] >= 0) { + prev_col_y[0] = y; + } else { + prev_col_y[1] = y; + } } } } |