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snake now moves in reaction to itself

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- natural snake movement for whole body
This commit is contained in:
Fredrik Robertsen
2025-04-06 11:48:50 +02:00
parent a14525e027
commit e09b52c9ed
1 changed files with 45 additions and 7 deletions
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52
src/main.c
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@@ -122,21 +122,59 @@ SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event) {
}
void game_step(State *stateptr) {
vector_print(stateptr->player.body);
int head = vector_pop(&stateptr->player.body);
DIRECTION dir = stateptr->player.direction;
for (int i = 0; i < stateptr->player.length - 1; i++) {
int cur = stateptr->player.body.data[i];
switch (dir) {
case RIGHT:
stateptr->player.body.data[i] = cur + 1;
break;
case UP:
stateptr->player.body.data[i] = cur - GRID_WIDTH;
break;
case LEFT:
stateptr->player.body.data[i] = cur - 1;
break;
case DOWN:
stateptr->player.body.data[i] = cur + GRID_WIDTH;
break;
}
switch (stateptr->player.direction) {
int next = stateptr->player.body.data[i + 1];
int delta = next - cur;
switch (delta) {
case 1:
dir = LEFT;
break;
case -1:
dir = RIGHT;
break;
case GRID_WIDTH:
dir = UP;
break;
case -GRID_WIDTH:
dir = DOWN;
break;
default:
SDL_Log("game_step: shouldn't be here");
break;
}
}
int i = stateptr->player.length - 1;
int cur = stateptr->player.body.data[i];
switch (dir) {
case RIGHT:
vector_push(&stateptr->player.body, head + 1);
stateptr->player.body.data[i] = cur + 1;
break;
case UP:
vector_push(&stateptr->player.body, head - GRID_WIDTH);
stateptr->player.body.data[i] = cur - GRID_WIDTH;
break;
case LEFT:
vector_push(&stateptr->player.body, head - 1);
stateptr->player.body.data[i] = cur - 1;
break;
case DOWN:
vector_push(&stateptr->player.body, head + GRID_WIDTH);
stateptr->player.body.data[i] = cur + GRID_WIDTH;
break;
}
}