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Copy pathlibBarsAndGauges.asm
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libBarsAndGauges.asm
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XSCRNLOC = ZeroPageParam1
YSCRNLOC = ZeroPageParam3
YGAUGLOC = ZeroPageParam5
FULLBlock = 255
EmptyBlock = 247
ORValue = 8
XVALUE ; X Velocity Value
BYTE 00
YVALUE ; Y Velocity Value
BYTE 00
YPOS ; Y Position (Height)
BYTE 00
XPOS ; X Position
BYTE 00
XINDEXPOS
BYTE 00
YINDEXPOS
BYTE 00
YGAUGEINDEX
BYTE 00
XBARCHARACTERS
BYTE $20,$65,$54,$47,$5D,$48,$59,$67,$67
; 0 1 2 3 4 5 6 7 8
YBARCHARACTERS
;BYTE $20,$77,$45,$44,$40,$46,$52,$6F,$6F
BYTE 246,238,239,240,241,242,243,244,245
; 0 1 2 3 4 5 6 7 8
YBARCHARACTERSFULL
BYTE 255
YGAUGECHARACTERS
;BYTE 247,239,240,241,242,243,244,245,255
BYTE 246,254,253,252,251,250,249,248,247
; 0 1 2 3 4 5 6 7 8
YGAUGECHARACTERSFULL
BYTE 255
YSCREENOFFSETLO
BYTE $00,$28,$50,$78,$A0,$C8,$F0,$18,$40,$68,$90,$B8,$E0
BYTE $08,$30,$58,$80,$A8,$D0,$F8,$20,$48,$70,$98,$C0,$E8
YSCREENOFFSETHI
BYTE $00,$00,$00,$00,$00,$00,$00,$01,$01,$01,$01,$01,$01
BYTE $02,$02,$02,$02,$02,$02,$02,$03,$03,$03,$03,$03,$03
defm LIBBARSANDGAUGES_INITYBAR_AV ; /1 = Start Location (Address)
; /2 = Iterations (Value)
ldx #</1
lda #>/1
sta @SCREENLOC+2
stx @SCREENLOC+1
ldx #0
@LOOP
lda #FULLBlock
@SCREENLOC
sta /1
clc
lda #40
adc @SCREENLOC+1
sta @SCREENLOC+1
lda #0
adc @SCREENLOC+2
sta @SCREENLOC+2
inx
cpx #/2
bne @LOOP
endm
defm LIBBARSANDGAUGES_INITXBAR_AV ; /1 Start Location (Address)
; /2 Iterations (Value)
ldx #0
@LOOP
lda #160
sta /1,x
inx
cpx #/2
bne @LOOP
endm
defm LIBBARSANDGAUGES_SHOWXCENTREBAR
; Input Paramters : Acc = Value
pha ; Store Away Value Safely
bmi @NEGATIVEVALUE
lsr ; Divide By 2
lsr ; Divide By 4
lsr ; Divide By 8
cmp XINDEXPOS
beq @XPOSSAME
pha
lda XBARCHARACTERS
ora #$80
ldy #0
sta (XSCRNLOC),y
pla
@XPOSSAME
sta XINDEXPOS
sta $0401
clc
adc #</1
sta XSCRNLOC
lda #0
adc #>/1
sta XSCRNLOC + 1
pla
and #$07
tay
iny
jmp @END
@NEGATIVEVALUE
eor #$FF
clc
adc #1
lsr
lsr
lsr
clc
adc #01
cmp XINDEXPOS
beq @XPOSSAME1
pha
lda XBARCHARACTERS
ora #$80
ldy #0
sta (XSCRNLOC),y
pla
@XPOSSAME1
sta XINDEXPOS
sta $0401
lda #</1
sec
sbc XINDEXPOS
sta XSCRNLOC
lda #>/1
sbc #0
sta XSCRNLOC + 1
pla
and #$07
tay
iny
@END
sty $0400
lda XBARCHARACTERS,y
ora #128
ldy #0
sta (SCRNLOC),y
endm
defm LIBBARSANDGAUGES_SHOWXBAR_AV ; /1 = Start Screen Location (Address)
; /2 = Offset (Value)
; Input Paramters : Acc = Value
clc
adc #/2 ; Adds Centre Ofset
pha ; Store Away Value Safely
lsr ; Divide By 2
lsr ; Divide By 4
lsr ; Divide By 8
cmp XINDEXPOS
beq @XPOSSAME
pha ; Store Away New XINDEXPOS Temporarily
lda XBARCHARACTERS
ora #$80
ldy #0
sta (XSCRNLOC),y ; Blank out last location
pla ; Get back New XINDEXPOS
@XPOSSAME
sta XINDEXPOS
sta $0401
clc
adc #</1
sta XSCRNLOC
lda #0
adc #>/1
sta XSCRNLOC + 1
pla
and #$07
tay
iny
sty $0400
lda XBARCHARACTERS,y
ora #128
ldy #0
sta (XSCRNLOC),y
endm
defm LIBBARSANDGAUGES_SHOWYBAR_AV ; /1 = Start Screen Location (Address)
; /2 = Offset (Value)
; Input Parameters : Acc = Value
clc
adc #/2 ; Adds Centre Offset
pha ; Store Away Value Safely
lsr ; Divide By 2
lsr ; Divide By 4
lsr ; Divide By 8
cmp YINDEXPOS
beq @YPOSSAME
pha ; Store Away New YINDEXPOS Temporarily
lda YBARCHARACTERSFULL
;ora #ORValue
ldy #0
sta (YSCRNLOC),y ; Blank out last location
pla ; Get back New YINDEXPOS
@YPOSSAME
sta YINDEXPOS
tax
;sta $0401
clc
lda #0
adc YSCREENOFFSETLO,x
sta YSCRNLOC
lda #0
adc YSCREENOFFSETHI,x
sta YSCRNLOC + 1
clc
lda YSCRNLOC
adc #</1
sta YSCRNLOC
lda YSCRNLOC + 1
adc #>/1
sta YSCRNLOC + 1
pla
and #$07
tay
iny
;sty $0400
lda YBARCHARACTERS,y
;ora #ORValue
ldy #0
sta (YSCRNLOC),y
endm
defm LIBBARSANDGAUGES_SHOWYGAUGE_AV ; /1 = Start Screen Location (Address)
; /2 = Offset (Value)
; Input Parameter : Acc = Value
clc
adc #/2 ; Adds Centre Offset
pha ; Store Away Value Safely
lsr ; Divide By 2
lsr ; Divide By 4
lsr ; Divide By 8
cmp YGAUGEINDEX ; Is new location same as old location?
beq @YSAME ; Yes, then skip the next instructions
pha ; Store Away New XINDEXPOS Temporarily
tay
lda YGAUGECHARACTERS; Get first character from GAUGE Character Set
cpy YGAUGEINDEX
bcs @YGaugeClearFill
lda YGAUGECHARACTERSFULL
@YGaugeClearFill
ldy #0
sta (YGAUGLOC),y ; Blank out last location
pla ; Get back New XINDEXPOS
@YSAME
sta YGAUGEINDEX ; Store New Location
tax ; transfer to index register
clc
lda #0
adc YSCREENOFFSETLO,x ; Add screen row offset (lo)
sta YGAUGLOC ; store in pointer (lo)
lda #0
adc YSCREENOFFSETHI,x ; Add screen row offset (hi)
sta YGAUGLOC + 1 ; store in pointer (hi)
clc
lda YGAUGLOC ; Get screen pointer (lo)
adc #</1 ; Add screen location (lo)
sta YGAUGLOC ; Store back to pointer (lo)
lda YGAUGLOC + 1 ; Get screen pointer (hi)
adc #>/1 ; Add screen location (hi)
sta YGAUGLOC + 1 ; Store back pointer (hi)
pla ; Get back Value from stack
and #$07 ; mask off the 3 least significant bits (value/8)
tay ; Move to index register
iny ; add 1
lda YGAUGECHARACTERS,y ; Get corresponding YGaugeCharacter From Set
;eor #ORValue ; invert the character
ldy #0 ; init Y
sta (YGAUGLOC),y ; store character on screen
endm