Full stop when not moving on walking state

Before this commit the same logic as in throttle state was applied in
which acceleration was applied. This brings back the logic more closely
to the original game.

Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>

1 files changed, 8 insertions, 3 deletions

diff --git a/src/player.s b/src/player.s
index b900e52..e86c491 100644
--- a/src/player.s
+++ b/src/player.s
@@ -370,11 +370,16 @@
         lda #THROTTLE_RIGHT
         bne @apply_acceleration
 
-        ;; If neither left nor right is being pressed, go for a zero
-        ;; acceleration, which will slow down the player instead of going to a
-        ;; full stop.
+        ;; If neither left nor right is being pressed we have to move to a
+        ;; resting state on the horizontal axis. When throttling this means an
+        ;; acceleration of 0 (i.e. slow down), when walking this means going to
+        ;; an immediate full stop.
     @nothing:
         lda #0
+        bit zp_state
+        bmi @apply_acceleration
+        sta zp_velocity_x
+        beq @apply_velocity
 
         ;; As with vertical motion, `a` contains the acceleration to aim for,
         ;; and we just subtract the current velocity and see if we either have