diff options
| author | Vito Caputo <vcaputo@pengaru.com> | 2022-12-03 11:13:40 -0800 |
|---|---|---|
| committer | Vito Caputo <vcaputo@pengaru.com> | 2022-12-03 11:16:16 -0800 |
| commit | d83ecdfb615aaf71e2807886488941bc1cb7a80d (patch) | |
| tree | bbaf68986429fab254cf6289fb5c7b9891bb7a18 | |
| parent | 5cf1d72cef303cc71a6a2295ff0074a8e40b5cd6 (diff) | |
game: give adult some acceleration steps from standstill
When navigating tight situations the existing instantaneous 0-100
is difficult to control. By introducing a small bit of
acceleration, one can pulse the controls to make small movements.
Note this doesn't introduce a deceleration curve, movement still
stops immediately upon release of the controls. It's not
anything like a physics simulation, it's just a few frames worth
of ramping up to 100% movement speed for the adult, plain linear
ramp for now.
Now it feels like pixel-accurate collision detection might be
worth adding...
| -rw-r--r-- | src/game.c | 14 |
1 files changed, 11 insertions, 3 deletions
@@ -48,7 +48,8 @@ #define GAME_NUM_BABIES 10 #define GAME_VIRUS_SPEED .01f -#define GAME_ADULT_SPEED .04f +#define GAME_ADULT_SPEED .05f +#define GAME_ADULT_ACCEL .25f #define GAME_MASK_SPEED .02f #define GAME_ENTITIES_DELAY_MS 20 @@ -1051,6 +1052,7 @@ static void game_update(play_t *play, void *context) if (play_ticks_elapsed(play, GAME_KBD_TIMER, GAME_KBD_DELAY_MS)) { const Uint8 *key_state = SDL_GetKeyboardState(NULL); v2f_t dir = {}, *move = NULL; + static float velocity; /* TODO: acceleration curve for movement? it'd enable more precise * negotiating of obstacles, but that's not really worthwhile until there's @@ -1084,14 +1086,20 @@ static void game_update(play_t *play, void *context) if (move) { float distance; + if (velocity < 1.f) + velocity += GAME_ADULT_ACCEL; + if (velocity > 1.f) + velocity = 1.f; + distance = v2f_length(move); if (distance) { *move = v2f_normalize(move); - *move = v2f_mult_scalar(move, distance < GAME_ADULT_SPEED ? distance : GAME_ADULT_SPEED); + *move = v2f_mult_scalar(move, velocity * (distance < GAME_ADULT_SPEED ? distance : GAME_ADULT_SPEED)); } game_move_adult(game, move); - } + } else + velocity = 0; } if (play_ticks_elapsed(play, GAME_TV_TIMER, GAME_TV_DELAY_MS)) { |