mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-06-09 22:29:36 +00:00
252 lines
2.7 KiB
ArmAsm
252 lines
2.7 KiB
ArmAsm
; circles tiny -- Apple II Hires
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; 229 -- first
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; 228 -- remove shift
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; 190 -- move hplots into two loops
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; 169 -- move hplots into one loop
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; 166 -- small enough we can use bcs again
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; 157 -- some more math
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; D0+ used by HGR routines
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HGR_COLOR = $E4
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HGR_PAGE = $E6
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COUNT = $F6
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XX = $F7
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MINUSXX = $F8
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YY = $F9
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MINUSYY = $FA
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D = $FB
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R = $FC
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CX = $FD
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CY = $FE
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FRAME = $FF
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; soft-switches
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KEYPRESS = $C000
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KEYRESET = $C010
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; ROM routines
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HGR2 = $F3D8 ; set hires page2 and clear $4000-$5fff
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HGR = $F3E2 ; set hires page1 and clear $2000-$3fff
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HPLOT0 = $F457 ; plot at (Y,X), (A)
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HLINRL = $F530 ; line to (X,A), (Y)
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HCOLOR1 = $F6F0 ; set HGR_COLOR to value in X
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COLORTBL = $F6F6
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PLOT = $F800 ; PLOT AT Y,A (A colors output, Y preserved)
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NEXTCOL = $F85F ; COLOR=COLOR+3
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SETCOL = $F864 ; COLOR=A
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SETGR = $FB40 ; set graphics and clear LO-RES screen
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BELL2 = $FBE4
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WAIT = $FCA8 ; delay 1/2(26+27A+5A^2) us
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circles:
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lda #1
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sta R
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draw_next:
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jsr HGR2
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;draw_next:
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.if 0
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inc FRAME
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ldy FRAME
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; Random Color
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; HCOLOR=1+RND(1)*7
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lda $F000,Y
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and #$7 ; mask to 0...7
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tax
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lda COLORTBL,X
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sta HGR_COLOR
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; CX
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lda $F100,Y
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and #$7f
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clc
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adc #$40
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sta CX
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; CY
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lda $F200,Y
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and #$7f
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clc
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adc #$20
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sta CY
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; R
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lda $F300,Y
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and #$3f
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sta R
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.endif
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; A=40+RND(1)*200:B=40+RND(1)*100:Y=RND(1)*40
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lda #128
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sta CX
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lda #96
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sta CY
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;===============================
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; draw circle
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;===============================
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; draw circle at (CX,CY) of radius R
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; signed 8-bit math so problems if R > 64?
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; XX=0 YY=R
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; D=3-2*R
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; GOTO6
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lda #0
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sta XX
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lda R
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sta YY
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lda #3
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sec
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sbc R
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sbc R
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sta D
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jmp do_plots
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circle_loop:
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; X=X+1
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inc XX
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; IF D>0 THEN Y=Y-1:D=D+4*(X-Y)+10
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lda D
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bmi else
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dec YY
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lda XX
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sec
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sbc YY
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asl
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asl
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clc
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adc D
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adc #10
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jmp store_D
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else:
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; ELSE D=D+4*X+6
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lda XX
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asl
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asl
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clc
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adc D
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adc #6
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store_D:
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sta D
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do_plots:
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; setup constants
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lda XX
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eor #$FF
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sta MINUSXX
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inc MINUSXX
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lda YY
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eor #$FF
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sta MINUSYY
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inc MINUSYY
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; HPLOT CX+X,CY+Y
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; HPLOT CX-X,CY+Y
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; HPLOT CX+X,CY-Y
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; HPLOT CX-X,CY-Y
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; HPLOT CX+Y,CY+X
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; HPLOT CX-Y,CY+X
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; HPLOT CX+Y,CY-X
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; HPLOT CX-Y,CY-X
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lda #3
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sta COUNT
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pos_loop:
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; calc left side
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; calc X co-ord
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lda COUNT
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ora #$1
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eor #$2
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tay
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lda CX
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clc
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adc XX,Y
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tax
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; calc y co-ord
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ldy COUNT
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lda CY
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clc
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adc XX,Y
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ldy #0
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pha ; save Y value for later
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jsr HPLOT0 ; plot at (Y,X), (A)
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; calc right side
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lda XX
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asl
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ldy #0
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ldx #0
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jsr HLINRL ; plot relative (X,A), (Y)
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; so in our case (0,XX*2),0
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dec COUNT
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bpl pos_loop
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; IFY>=XTHEN4
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lda YY
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cmp XX
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bcs circle_loop
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done:
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lda KEYPRESS
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bpl done
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bit KEYRESET
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inc R
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; GOTO1
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jmp draw_next
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