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
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
PACKET std plot DEFINES drawing area,
begin plot,
end plot,
clear,
pen,
move,
draw,
get cursor:
LET delete = 0, {Farbcodes}
std = 1,
black = 5,
white = 6,
durchgehend = 1, {Linientypen}
gepunktet = 2,
kurz gestrichelt = 3,
lang gestrichelt = 4,
strichpunkt = 5,
empty = 0, {Punktsymbole}
high = 1,
low = 2,
both = 3;
LET POS = STRUCT (INT x, y);
ROW 79 ROW 24 INT VAR screen;
BOOL VAR colour :: TRUE, action :: TRUE;
POS VAR pos :: POS : (0, 0);
clear;
PROC drawing area (REAL VAR x cm, y cm, INT VAR x pixel, y pixel) :
x cm := 25.0; y cm := 17.0; {***** Horizontale und vertikale *****}
{***** Größe in Zentimetern. *****}
x pixel := 79; y pixel := 48 {***** Koordinaten des rechten *****}
{***** oberen Punktes. *****}
END PROC drawing area;
PROC begin plot :
ENDPROC begin plot ;
PROC end plot :
ENDPROC end plot ;
PROC clear :
INT VAR i, j;
colour := TRUE;
action := TRUE;
pos := POS : (0, 0);
FOR i FROM 1 UPTO 24
REP screen [1] [i] := 0 PER;
FOR i FROM 2 UPTO 79
REP screen [i] := screen [1] PER;
page;
out (""6""23""0"") .
END PROC clear;
PROC pen (INT CONST background, foreground, thickness, linetype):
colour := foreground > 0;
action := linetype <> 0 .
END PROC pen;
PROC move (INT CONST x, y) :
out (""6""+ code (23-y DIV 2) + code (x));
pos := POS : (x, y)
END PROC move;
PROC draw (INT CONST x, y) :
IF action
THEN vector (x-pos.x, y-pos.y) FI;
pos := POS : (x, y) .
END PROC draw;
PROC vector (INT CONST dx , dy) :
IF dx >= 0
THEN IF dy > dx THEN vector (pos.y, pos.x, dy, dx, 1, 1)
ELIF dy > 0 THEN vector (pos.x, pos.y, dx, dy, 1, 1)
ELIF dy > -dx THEN vector (pos.x, pos.y, dx, -dy, 1,-1)
ELSE vector (pos.y, pos.x, -dy, dx,-1, 1) FI
ELSE IF dy > -dx THEN vector (pos.y, pos.x, dy, -dx, 1,-1)
ELIF dy > 0 THEN vector (pos.x, pos.y, -dx, dy,-1, 1)
ELIF dy > dx THEN vector (pos.x, pos.y, -dx, -dy,-1,-1)
ELSE vector (pos.y, pos.x, -dy, -dx,-1,-1) FI
FI .
ENDPROC vector ;
PROC vector (INT VAR x pos, y pos, INT CONST dx, dy, right, up) :
INT VAR i;
prepare first step ;
point;
FOR i FROM 1 UPTO dx
REP do one step PER .
prepare first step :
INT VAR up right error := dy - dx,
right error := dy,
old error := 0 .
do one step:
IF right is better
THEN do right step
ELSE do up right step
FI .
right is better :
abs (old error + right error) < abs (old error + up right error) .
do upright step :
x pos INCR right ;
y pos INCR up ;
point ;
old error INCR upright error .
do right step :
x pos INCR right ;
point ;
old error INCR right error .
point :
IF (pos.y AND 1) = 0
THEN lower point
ELSE upper point FI .
lower point :
out (""6""+ code (23-pos.y DIV 2) + code (pos.x));
IF colour
THEN set lower point
ELSE reset lower point FI .
set lower point:
SELECT screen [pos.x+1] [pos.y DIV 2+1] OF
CASE empty : out (","8"");
screen [pos.x+1] [pos.y DIV 2+1] := low
CASE high : out ("|"8"");
screen [pos.x+1] [pos.y DIV 2+1] := both
ENDSELECT .
reset lower point:
SELECT screen [pos.x+1] [pos.y DIV 2+1] OF
CASE low : out (" "8"");
screen [pos.x+1] [pos.y DIV 2+1] := empty
CASE both : out ("'"8"");
screen [pos.x+1] [pos.y DIV 2+1] := high
ENDSELECT .
upper point :
out (""6""+ code (23-pos.y DIV 2) + code (pos.x));
IF colour
THEN set upper point
ELSE reset upper point FI .
set upper point:
SELECT screen [pos.x+1] [pos.y DIV 2+1] OF
CASE empty : out ("'"8"");
screen [pos.x+1] [pos.y DIV 2+1] := high
CASE low : out ("|"8"");
screen [pos.x+1] [pos.y DIV 2+1] := both
ENDSELECT .
reset upper point:
SELECT screen [pos.x+1] [pos.y DIV 2+1] OF
CASE high : out (" "8"");
screen [pos.x+1] [pos.y DIV 2+1] := empty
CASE both : out (","8"");
screen [pos.x+1] [pos.y DIV 2+1] := low
ENDSELECT .
END PROC vector;
PROC draw (TEXT CONST record, REAL CONST angle, height, width):
out (subtext (record, 1, 79-pos.x));
out (""6""+ code (23-pos.y DIV 2) + code (pos.x));
END PROC draw;
PROC draw (TEXT CONST record) :
draw (record, 0.0, 0.0, 0.0)
END PROC draw;
PROC get cursor (TEXT VAR t, INT VAR x, y) :
x := pos.x;
y := pos.y;
REP out (""6""+ code (23-y DIV 2) + code (x));
inchar (t);
SELECT code (t) OF
CASE 2 : x INCR 1
CASE 3 : y INCR 1
CASE 8 : x DECR 1
CASE 10: y DECR 1
CASE 1 : out (""0""1"" + text (x, 3) + "," + text (y, 3) + " "13""16"")
OTHERWISE leave get cursor ENDSELECT;
check
PER .
leave get cursor:
out (""6""+ code (23-pos.y DIV 2) + code (pos.x));
LEAVE get cursor .
check :
IF x < 0
THEN x := 0;
out (""7"")
ELIF x > 47
THEN x := 47;
out (""7"")
FI;
IF y < 0
THEN y := 0;
out (""7"")
ELIF y > 78
THEN y := 78;
out (""7"")
FI .
END PROC get cursor;
PROC test (INT CONST x, y, TEXT CONST t):
out (""27";(" + text (x) + "," + text (y) + ") " + t + ""29"");
IF incharety (10000) = ""27""
THEN stop FI
END PROC test;
END PACKET std plot;
|
