Apple-2-SW/dos33fsprogs
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sb: bounce off walls

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This commit is contained in:
Vince Weaver 2023-06-10 22:20:30 -04:00
parent 261be4abdb
commit b95389b54e
2 changed files with 37 additions and 8 deletions
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38
games/sb/asplode.s
View File

@ -152,6 +152,9 @@ load_background:
sta BULLET_X_VEL sta BULLET_X_VEL
sta HEAD_DAMAGE sta HEAD_DAMAGE
lda #$80
sta BULLET_X_VEL_L
lda #20 lda #20
sta BULLET_X sta BULLET_X
lda #0 lda #0
@ -241,17 +244,39 @@ no_move_head:
clc clc
lda BULLET_X_L lda BULLET_X_L
adc BULLET_X_VEL adc BULLET_X_VEL_L
sta BULLET_X_L sta BULLET_X_L
lda BULLET_X lda BULLET_X
adc #0 adc BULLET_X_VEL
sta BULLET_X sta BULLET_X
; TODO: bounce off walls ;========================
; bounce off "walls"
; in reality just bounce if <9 or > 29?
lda BULLET_X
cmp #29
bcs walls_out ; bge
cmp #9
bcs walls_good ; bge
walls_out:
; flip X direction
sec
lda #0
sbc BULLET_X_VEL_L
sta BULLET_X_VEL_L
lda #0
sbc BULLET_X_VEL
sta BULLET_X_VEL
walls_good:
inc BULLET_Y inc BULLET_Y
lda BULLET_Y lda BULLET_Y
cmp #15 cmp #17
bcc bullet_still_good bcc bullet_still_good
; new bullet position ; new bullet position
@ -455,18 +480,21 @@ bullet_sprite_l:
.byte <bullet4_sprite, <bullet5_sprite, <bullet6_sprite, <bullet7_sprite .byte <bullet4_sprite, <bullet5_sprite, <bullet6_sprite, <bullet7_sprite
.byte <bullet8_sprite, <bullet9_sprite,<bullet10_sprite,<bullet11_sprite .byte <bullet8_sprite, <bullet9_sprite,<bullet10_sprite,<bullet11_sprite
.byte <bullet12_sprite,<bullet13_sprite,<bullet14_sprite,<bullet15_sprite .byte <bullet12_sprite,<bullet13_sprite,<bullet14_sprite,<bullet15_sprite
.byte <bullet_done_sprite
bullet_sprite_h: bullet_sprite_h:
.byte >bullet0_sprite, >bullet1_sprite, >bullet2_sprite, >bullet3_sprite .byte >bullet0_sprite, >bullet1_sprite, >bullet2_sprite, >bullet3_sprite
.byte >bullet4_sprite, >bullet5_sprite, >bullet6_sprite, >bullet7_sprite .byte >bullet4_sprite, >bullet5_sprite, >bullet6_sprite, >bullet7_sprite
.byte >bullet8_sprite, >bullet9_sprite,>bullet10_sprite,>bullet11_sprite .byte >bullet8_sprite, >bullet9_sprite,>bullet10_sprite,>bullet11_sprite
.byte >bullet12_sprite,>bullet13_sprite,>bullet14_sprite,>bullet15_sprite .byte >bullet12_sprite,>bullet13_sprite,>bullet14_sprite,>bullet15_sprite
.byte >bullet_done_sprite
bullet_sprite_y: bullet_sprite_y:
.byte 90,94,98,102 .byte 90,94,98,102
.byte 106,110,114,118 .byte 106,110,114,118
.byte 122,126,130,134 .byte 122,126,130,134
.byte 138,142,146,150 .byte 139,144,149,154
.byte 159
; original ; original
; 1 = 6 ; 1 = 6

7
games/sb/zp.inc
View File

@ -73,9 +73,10 @@ SHIELD_POSITION = $6E
SHIELD_COUNT = $6F SHIELD_COUNT = $6F
BULLET_X = $70 BULLET_X = $70
BULLET_X_L = $71 BULLET_X_L = $71
BULLET_X_VEL = $72 BULLET_Y = $72
BULLET_Y = $73 HEAD_DAMAGE = $73
HEAD_DAMAGE = $74 BULLET_X_VEL = $74
BULLET_X_VEL_L = $75
.if 0 .if 0
REGISTER_DUMP = $70 REGISTER_DUMP = $70