tcircgen.c - plan9port - [fork] Plan 9 from user space
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tcircgen.c (2651B)
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1 #include <stdio.h>
2 #include "pic.h"
3 #include "y.tab.h"
4
5 obj*
6 circgen(int type)
7 {
8 static double rad[2] = { HT2, WID2 };
9 static double rad2[2] = { HT2, HT2 };
10 int i, at, t, with, battr;
11 double xwith, ywith;
12 double r, r2, ddval, fillval;
13 obj *p, *ppos;
14 Attr *ap;
15
16 battr = at = 0;
17 with = xwith = ywith = fillval = 0;
18 t = (type == CIRCLE) ? 0 : 1;
19 r = 0;
20 r2 = 0;
21 ddval = 0;
22 if (type == CIRCLE)
23 r = r2 = getfval("circlerad");
24 else if (type == ELLIPSE) {
25 r = getfval("ellipsewid") / 2;
26 r2 = getfval("ellipseht") / 2;
27 }
28 for (i = 0; i < nattr; i++) {
29 ap = &attr[i];
30 switch (ap->a_type) {
31 case TEXTATTR:
32 savetext(ap->a_sub, ap->a_val.p);
33 break;
34 case RADIUS:
35 r = ap->a_val.f;
36 break;
37 case DIAMETER:
38 case WIDTH:
39 r = ap->a_val.f / 2;
40 break;
41 case HEIGHT:
42 r2 = ap->a_val.f / 2;
43 break;
44 case SAME:
45 r = rad[t];
46 r2 = rad2[t];
47 break;
48 case WITH:
49 with = ap->a_val.i;
50 break;
51 case AT:
52 ppos = ap->a_val.o;
53 curx = ppos->o_x;
54 cury = ppos->o_y;
55 at++;
56 break;
57 case INVIS:
58 battr |= INVIS;
59 break;
60 case DOT:
61 case DASH:
62 battr |= ap->a_type==DOT ? DOTBIT : DASHBIT;
63 if (ap->a_sub == DEFAULT)
64 ddval = getfval("dashwid");
65 else
66 ddval = ap->a_val.f;
67 break;
68 case FILL:
69 battr |= FILLBIT;
70 if (ap->a_sub == DEFAULT)
71 fillval = getfval("fillval");
72 else
73 fillval = ap->a_val.f;
74 break;
75 }
76 }
77 if (type == CIRCLE)
78 r2 = r; /* probably superfluous */
79 if (with) {
80 switch (with) {
81 case NORTH: ywith = -r2; break;
82 case SOUTH: ywith = r2; break;
83 case EAST: xwith = -r; break;
84 case WEST: xwith = r; break;
85 case NE: xwith = -r * 0.707; ywith = -r2 * 0.707; break;
86 case SE: xwith = -r * 0.707; ywith = r2 * 0.707; break;
87 case NW: xwith = r * 0.707; ywith = -r2 * 0.707; break;
88 case SW: xwith = r * 0.707; ywith = r2 * 0.707; break;
89 }
90 curx += xwith;
91 cury += ywith;
92 }
93 if (!at) {
94 if (isright(hvmode))
95 curx += r;
96 else if (isleft(hvmode))
97 curx -= r;
98 else if (isup(hvmode))
99 cury += r2;
100 else
101 cury -= r2;
102 }
103 p = makenode(type, 2);
104 p->o_val[0] = rad[t] = r;
105 p->o_val[1] = rad2[t] = r2;
106 if (r <= 0 || r2 <= 0) {
107 ERROR "%s has invalid radius %g\n", (type==CIRCLE) ? "circle" : "ellipse", r<r2 ? r : r2 WARNING;
108 }
109 p->o_attr = battr;
110 p->o_ddval = ddval;
111 p->o_fillval = fillval;
112 extreme(curx+r, cury+r2);
113 extreme(curx-r, cury-r2);
114 if (type == CIRCLE)
115 dprintf("C %g %g %g\n", curx, cury, r);
116 if (type == ELLIPSE)
117 dprintf("E %g %g %g %g\n", curx, cury, r, r2);
118 if (isright(hvmode))
119 curx += r;
120 else if (isleft(hvmode))
121 curx -= r;
122 else if (isup(hvmode))
123 cury += r2;
124 else
125 cury -= r2;
126 return(p);
127 }