forked from pkali/scorch_src
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathcircle1.asm
204 lines (187 loc) · 3.02 KB
/
circle1.asm
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
.IF *>0 ;this is a trick that prevents compiling this file alone
;--------------------------------------------------
.proc circle ;fxxxing good circle drawing :)
; xdraw,ydraw (word) - coordinates of circle center
; radius (byte) - radius of circle
;--------------------------------------------------
;Turbo Basic source
; R=30
; XC=0:YC=R
; FX=0:FY=8*R:FS=4*R+3
; WHILE FX<FY
; splot8 //splot8 are eight plotz around the circle
; XC=XC+1
; FX=FX+8
; IF FS>0
; FS=FS-FX-4
; ELSE
; YC=YC-1
; FY=FY-8
; FS=FS-FX-4+FY
; ENDIF
; WEND
; splot8
mwa xdraw xcircle
mwa ydraw ycircle
; XC=0:YC=R
mwa #0 xc
mva radius yc
; FX=0:FY=8*R:FS=4*R+3
mva #0 fx
mva radius fy
asl FY
asl FY
mva FY FS
asl FY
; A = FS and C = 0
;clc
;lda FS
adc #3
sta FS
circleloop
; WHILE FX<FY
lda FX
cmp FY
bcc not_endcircleloop
endcircleloop
mwa xcircle xdraw
mwa ycircle ydraw
rts
not_endcircleloop
; jsr splot8
;----
; splot8
; plot xcircle+XC,ycircle+YC
; plot xcircle+XC,ycircle-YC
; plot xcircle-XC,ycircle-YC
; plot xcircle-XC,ycircle+YC
; plot xcircle+YC,ycircle+XC
; plot xcircle+YC,ycircle-XC
; plot xcircle-YC,ycircle-XC
; plot xcircle-YC,ycircle+XC
;clc - allways after BCC
lda xcircle
adc XC
sta xdraw
lda xcircle+1
adc #0
sta xdraw+1
;clc
lda ycircle
adc YC
sta ydraw
sta ytempDRAW
lda ycircle+1
adc #$00
sta ydraw+1
sta ytempDRAW+1
; plot xcircle+XC,ycircle+YC
jsr plot
sec
lda ycircle
sbc YC
sta ydraw
lda ycircle+1
sbc #$00
sta ydraw+1
; plot xcircle+XC,ycircle-YC
jsr plot
sec
lda xcircle
sbc XC
sta xdraw
lda xcircle+1
sbc #0
sta xdraw+1
; plot xcircle-XC,ycircle-YC
jsr plot
lda ytempDRAW
sta ydraw
lda ytempDRAW+1
sta ydraw+1
; plot xcircle-XC,ycircle+YC
jsr plot
;---
clc
lda xcircle
adc YC
sta xdraw
lda xcircle+1
adc #0
sta xdraw+1
;clc
lda ycircle
adc XC
sta ydraw
sta ytempDRAW
lda ycircle+1
adc #$00
sta ydraw+1
sta ytempDRAW+1
; plot xcircle+YC,ycircle+XC
jsr plot
sec
lda ycircle
sbc XC
sta ydraw
lda ycircle+1
sbc #$00
sta ydraw+1
; plot xcircle+YC,ycircle-XC
jsr plot
sec
lda xcircle
sbc YC
sta xdraw
lda xcircle+1
sbc #0
sta xdraw+1
; plot xcircle-YC,ycircle-XC
jsr plot
lda ytempDRAW
sta ydraw
lda ytempDRAW+1
sta ydraw+1
; plot xcircle-YC,ycircle+XC
jsr plot
;-----
; XC=XC+1
inc XC
; FX=FX+8
clc
lda FX
adc #8
sta FX
; IF FS>0
; FS=FS-FX-4
lda FS
beq else01
bmi else01
sec
sbc FX
sbc #4
sta FS
jmp circleloop ; endif01
else01
; ELSE
; YC=YC-1
dec YC
; FY=FY-8
sec
lda FY
sbc #8
sta FY
; FS=FS-FX-4+FY
lda FS
sec
sbc FX
sbc #4
clc
adc FY
sta FS
endif01
; ENDIF
jmp circleloop
; WEND
.endp
.endif