diff options
| -rw-r--r-- | snake.c | 65 |
1 files changed, 63 insertions, 2 deletions
@@ -285,7 +285,7 @@ void create_body(head *snake) /* these aren't used without updating, so the value doesn't really matter */ new->oldx = 0; new->oldy = 0; - /* our head wont will never have a prev */ + /* our head will never have a prev */ new->prev = NULL; snake->firstpiece = new; /* we have nothing else to do, so return */ @@ -315,6 +315,66 @@ void create_body(head *snake) void npc_logic(head *snake, food *eat) { + /* + * our goal location is eat->x and eat->y + * we must avoid: + * - running into our own body + * - running into the edge + * how to achieve this: + * - scan towards the x and y of the food (up/down and left/right, one of each) + * - if we hit the edge that is a safe direction to go + * - if we hit a body piece it isn't safe, but not out of the picture yet + * - if we hit the food, go that direction + */ + + /* + * these hold our desired x and y direction, defaults aren't important. + * a -1 means we are at the correct x or y position + */ + int xdir = UP; + int ydir = RIGHT; + /* find our desired x position */ + /* check if the food is to the left of the snake */ + if (eat->x < snake->x) + xdir = LEFT; + /* check if the food is to the right of the snake */ + else if (eat->x > snake->x) + xdir = RIGHT; + /* the food must be on the same x position as the snake */ + else + xdir = -1; + + /* find our desired y position */ + /* check if the food is below the snake */ + if (eat->y > snake->y) + ydir = DOWN; + /* check if the food is abovce the snake */ + else if (eat->y < snake->y) + ydir = UP; + /* the food must be on the same y position as the snake */ + else + ydir = -1; + /* if either value is -1, use the other and return */ + if (xdir == -1) + { + snake->direction = ydir; + return; + } + if (ydir == -1) + { + snake->direction = xdir; + return; + } + /* randomly choose which desired direciton to take */ + int x = rand() % 2; + if (x == 0) + snake->direction = ydir; + else + snake->direction = xdir; + + + + /* if (snake->y > eat->y) snake->direction = UP; else if (snake->y < eat->y) @@ -323,4 +383,5 @@ void npc_logic(head *snake, food *eat) snake->direction = LEFT; else if (snake->x < eat->x) snake->direction = RIGHT; - } + */ +} |