fumiama/c64-snake
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很多改进

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fumiama
2021-04-13 23:29:01 +08:00
parent 44c4e25be1
commit 43aa9250b1
7 changed files with 71 additions and 128 deletions
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15
main.asm
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@@ -19,20 +19,27 @@ main:
sta eat
jsr judgefood ; 判断是否吃到食物
bcc +
inc c ; 蛇长加一
lda #1
sta eat
jsr addfood
* jsr move ; 蛇移动一格
jsr calcscore ; 计算得分
jsr printscore ; 打印分数
lda d
sta prev_d ; 备份前一个按键
lda #32
jsr delay ; 延时期间最后一个按键位于d
lda d
cmp #ed_g
bne +
beq _end
cmp #st_g
bne ---
jsr getchar
lda prev_d
sta d ; 恢复按键
jmp ---
_end:
rts
* jmp ----
.scend
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@@ -47,8 +54,6 @@ main:
sta s + 1 ; 初始化分数为0
jsr printscore ; 打印分数
jsr move_init
lda #2
sta c ; 初始化蛇长为1
jsr printfield ; 打印蛇，包括边框
jsr printhint ; 打印开始提示
lda #go_d ; 初始化方向为下