Implement player - tile collision.
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parent
7ee428b20d
commit
790bcddfa9
60
platformer.c
60
platformer.c
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@ -84,11 +84,10 @@ static double timespec2double(struct timespec ts) {
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return ts.tv_sec + ts.tv_nsec / 1000.0 / 1000.0 / 1000.0;
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}
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char sample_tilemap(double x, double y) {
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static char sample_tilemap(size_t x, size_t y) {
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size_t tx = x / TILE_SIDE;
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size_t ty = y / TILE_SIDE;
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assert(tx < TILES);
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assert(ty < TILES);
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if (tx >= TILES || ty >= TILES) return ' ';
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return tilemap[ty * TILES + tx];
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}
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@ -105,6 +104,9 @@ static void update(struct timespec now, struct timespec dt_timespec) {
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else if (right_held) player_dx = 30;
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else player_dx = 0;
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if (jump_held) player_dy = -30;
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else player_dy = 30;
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// Collision against walls of the map
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if (player_x < 0) {
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player_x = 0;
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@ -122,22 +124,50 @@ static void update(struct timespec now, struct timespec dt_timespec) {
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}
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// Collision against tiles
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char topleft = sample_tilemap(player_x, player_y);
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char topright = sample_tilemap(player_x + TILE_SIDE, player_y);
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char bottomleft = sample_tilemap(player_x, player_y + TILE_SIDE);
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char bottomright = sample_tilemap(player_x + TILE_SIDE, player_y + TILE_SIDE);
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size_t px = player_x;
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size_t py = player_y;
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size_t left_cx = px - 1;
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size_t right_cx = px + TILE_SIDE;
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size_t leftright_top_cy = py;
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size_t leftright_bottom_cy = py + TILE_SIDE - 1;
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if ((sample_tilemap(left_cx, leftright_top_cy) != ' ' ||
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sample_tilemap(left_cx, leftright_bottom_cy) != ' ') &&
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player_dx < 0) {
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size_t snapped_px = (px + TILE_SIDE - 1) / TILE_SIDE * TILE_SIDE;
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player_x = snapped_px;
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player_dx = 0;
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}
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if ((sample_tilemap(right_cx, leftright_top_cy) != ' ' ||
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sample_tilemap(right_cx, leftright_bottom_cy) != ' ') &&
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player_dx > 0) {
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size_t snapped_px = px / TILE_SIDE * TILE_SIDE;
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player_x = snapped_px;
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player_dx = 0;
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}
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px = player_x;
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py = player_y;
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size_t topbottom_left_cx = px;
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size_t topbottom_right_cx = px + TILE_SIDE - 1;
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size_t top_cy = py - 1;
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size_t bottom_cy = py + TILE_SIDE;
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bool on_ground = false;
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if (bottomleft != ' ' || bottomright != ' ')
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if ((sample_tilemap(topbottom_left_cx, bottom_cy) != ' ' ||
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sample_tilemap(topbottom_right_cx, bottom_cy) != ' ') &&
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player_dy > 0) {
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on_ground = true;
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if (topleft != ' ' || topright != ' ' || bottomleft != ' ' || bottomright != ' ')
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player_dx = 0;
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if (on_ground)
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size_t snapped_py = py / TILE_SIDE * TILE_SIDE;
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player_y = snapped_py;
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player_dy = 0;
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else
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player_dy = 30;
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}
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if ((sample_tilemap(topbottom_left_cx, top_cy) != ' ' ||
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sample_tilemap(topbottom_right_cx, top_cy) != ' ') &&
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player_dy < 0) {
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size_t snapped_py = (py + TILE_SIDE - 1) / TILE_SIDE * TILE_SIDE;
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player_y = snapped_py;
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player_dy = 0;
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}
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}
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static void draw_grass_tile(size_t x, size_t y) {
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