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mist: sub: properly rotate to right direction before backing out

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This commit is contained in:
Vince Weaver 2020-08-03 22:50:39 -04:00
parent 389862f934
commit 542530772a
1 changed files with 100 additions and 0 deletions
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100
mist/sub_puzzle.s
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@ -166,6 +166,33 @@ cant_get_there_from_here:
rts
; current dest
; 0 1 2 3 4 5 6 7
;0 N R R R R L L L
;1 L N R R R R L L
;2 L L N R R R R L
;3 L L L N R R R R
;4 R L L L N R R R
;5 R R L L L N R R
;6 R R R L L L N R
;7 R R R R L L L N
; 0 1 2 3 4 5 6 7
;0 7 6 5 4 3 *2 *1 *0
;1 *8 7 6 5 4 3 *2 *1
;2 *9 *8 7 6 5 4 3 *2
;3 *10 *9 *8 7 6 5 4 3
;4 11 *10 *9 *8 7 6 5 4
;5 12 11 *10 *9 *8 7 6 5
;6 13 12 11 *10 *9 *8 7 6
;7 14 13 12 11 *10 *9 *8 7
; current-dest+7
; current-dest
; <0 0 >0
; if <-3 R, else L if >4 R, else L
sub_backtrack_pressed:
jsr click_speaker
@ -174,8 +201,78 @@ sub_backtrack_pressed:
ldy #BACKTRACK_DIR_OFFSET
lda (INL),Y
sta temp_direction
lda SUB_DIRECTION
sec
sbc temp_direction
beq proper_angle_now_go_back
bpl its_positive
its_negative:
cmp #$fd ; -3
bcc setup_decrement ; if <-3 then turn left
bcs setup_increment ; if >= -3 then turn right
its_positive:
cmp #4
bcc setup_decrement ; if < 4 then turn left
bcs setup_increment ; if >=4 then turn right
setup_decrement:
lda #SUB_ROTATE_LEFT_PATH_PATH
sta animation_smc+1
; C6=dec
lda #$C6
bne do_the_smc
setup_increment:
lda #SUB_ROTATE_RIGHT_PATH_PATH
sta animation_smc+1
; E6=inc
lda #$E6
do_the_smc:
sta inc_dec_smc
backtrack_rotate_loop:
lda temp_direction
cmp SUB_DIRECTION
beq proper_angle_now_go_back
animation_smc:
lda #SUB_ROTATE_RIGHT_PATH_PATH
sta ANIMATE_FRAME
jsr start_animating
; not the proper angle, so rotate until we are
backup_draw_loop:
jsr gr_copy_to_current
jsr draw_sub
jsr page_flip
inc FRAMEL
lda ANIMATE_FRAME
bne backup_draw_loop
inc_dec_smc:
inc SUB_DIRECTION
lda SUB_DIRECTION
and #$7
sta SUB_DIRECTION
jmp backtrack_rotate_loop
proper_angle_now_go_back:
jsr sub_point_to_struct
ldy #BACKTRACK_OFFSET
lda (INL),Y
sta SUB_LOCATION
@ -193,6 +290,9 @@ done_backtracking:
jmp start_animating
temp_direction:
.byte $0
;==============================
; helper to point to proper sub struct
sub_point_to_struct: