aboutsummaryrefslogtreecommitdiff
path: root/src/cmd/svgpic/plsvg.c
blob: 575dc356f1cdbdd399afd08bf3c16240db5168f7 (plain)
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
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
#include <stdio.h>
#include <math.h>
#include <string.h>
#include "pic.h"
extern int dbg;

#define	abs(n)	(n >= 0 ? n : -(n))
#define	max(x,y)	((x)>(y) ? (x) : (y))

char	*textshift = "\\v'.2m'";	/* move text this far down */

/* scaling stuff defined by s command as X0,Y0 to X1,Y1 */
/* output dimensions set by -l,-w options to 0,0 to hmax, vmax */
/* default output is 6x6 inches */


double	xscale;
double	yscale;

double	hpos	= 0;	/* current horizontal position in output coordinate system */
double	vpos	= 0;	/* current vertical position; 0 is top of page */

double	htrue	= 0;	/* where we really are */
double	vtrue	= 0;

double	X0, Y0;		/* left bottom of input */
double	X1, Y1;		/* right top of input */

double	hmax;		/* right end of output */
double	vmax;		/* top of output (down is positive) */

extern	double	deltx;
extern	double	delty;
extern	double	xmin, ymin, xmax, ymax;

double	xconv(double), yconv(double), xsc(double), ysc(double);
void	space(double, double, double, double);
void	hgoto(double), vgoto(double), hmot(double), vmot(double);
void	move(double, double), movehv(double, double);

char	svgfill[40] = "transparent";
char	svgstroke[40] = "black";

void openpl(char *s)	/* initialize device; s is residue of .PS invocation line */
{
	double maxw, maxh, ratio = 1;
	double odeltx = deltx, odelty = delty;

	hpos = vpos = 0;
	maxw = getfval("maxpswid");
	maxh = getfval("maxpsht");
	if (deltx > maxw) {	/* shrink horizontal */
		ratio = maxw / deltx;
		deltx *= ratio;
		delty *= ratio;
	}
	if (delty > maxh) {	/* shrink vertical */
		ratio = maxh / delty;
		deltx *= ratio;
		delty *= ratio;
	}
	if (ratio != 1) {
		fprintf(stderr, "pic: %g X %g picture shrunk to", odeltx, odelty);
		fprintf(stderr, " %g X %g\n", deltx, delty);
	}
	space(xmin, ymin, xmax, ymax);

	printf("<svg height=\"%.3f\" width=\"%.3f\"\n", yconv(ymin)+10, xconv(xmax)+10);
	printf("     xmlns=\"http://www.w3.org/2000/svg\">\n");
	printf("<g transform=\"translate(5 5)\">\n");

	/*
	printf("... %g %g %g %g\n", xmin, ymin, xmax, ymax);
	printf("... %.3fi %.3fi %.3fi %.3fi\n",
		xconv(xmin), yconv(ymin), xconv(xmax), yconv(ymax));
	printf(".nr 00 \\n(.u\n");
	printf(".nf\n");
	printf(".PS %.3fi %.3fi %s", yconv(ymin), xconv(xmax), s);
	*/
}

void space(double x0, double y0, double x1, double y1)	/* set limits of page */
{
	X0 = x0;
	Y0 = y0;
	X1 = x1;
	Y1 = y1;
	xscale = deltx == 0.0 ? 1.0 : deltx / (X1-X0);
	yscale = delty == 0.0 ? 1.0 : delty / (Y1-Y0);

	xscale *= 144;
	yscale *= 144;
}

double xconv(double x)	/* convert x from external to internal form */
{
	return (x-X0) * xscale;
}

double xsc(double x)	/* convert x from external to internal form, scaling only */
{

	return (x) * xscale;
}

double yconv(double y)	/* convert y from external to internal form */
{
	return (Y1-y) * yscale;
}

double ysc(double y)	/* convert y from external to internal form, scaling only */
{
	return (y) * yscale;
}

void closepl(char *PEline)	/* clean up after finished */
{
	printf("</g>\n");
	printf("</svg>\n");
}

void move(double x, double y)	/* go to position x, y in external coords */
{
	hgoto(xconv(x));
	vgoto(yconv(y));
}

void movehv(double h, double v)	/* go to internal position h, v */
{
	hgoto(h);
	vgoto(v);
}

void hmot(double n)	/* generate n units of horizontal motion */
{
	hpos += n;
}

void vmot(double n)	/* generate n units of vertical motion */
{
	vpos += n;
}

void hgoto(double n)
{
	hpos = n;
}

void vgoto(double n)
{
	vpos = n;
}

void hvflush(void)	/* get to proper point for output */
{
/*
	if (fabs(hpos-htrue) >= 0.0005) {
		printf("\\h'%.3fi'", hpos - htrue);
		htrue = hpos;
	}
	if (fabs(vpos-vtrue) >= 0.0005) {
		printf("\\v'%.3fi'", vpos - vtrue);
		vtrue = vpos;
	}
*/
}

void printlf(int n, char *f)
{
}

void troff(char *s)	/* output troff right here */
{
	printf("%s\n", s);
}

void label(char *s, int t, int nh)	/* text s of type t nh half-lines up */
{
	char *anchor;

	if (!s)
		return;

	if (t & ABOVE)
		nh++;
	else if (t & BELOW)
		nh--;
	t &= ~(ABOVE|BELOW);
	anchor = 0;
	if (t & LJUST) {
		// default
	} else if (t & RJUST) {
		anchor = "end";
	} else {	/* CENTER */
		anchor = "middle";
	}
	printf("<text x=\"%.3f\" y=\"%.3f\"", hpos, vpos-(double)(nh-0.4)*(12.0/72)/2*144);
	if(anchor)
		printf(" text-anchor=\"%s\"", anchor);
	printf(">%s</text>\n", s);
}

void line(double x0, double y0, double x1, double y1, int attr, double ddval)	/* draw line from x0,y0 to x1,y1 */
{
	printf("<path d=\"M %.3f %.3f L %.3f %.3f\" fill=\"transparent\" stroke=\"black\"", xconv(x0), yconv(y0), xconv(x1), yconv(y1));
	if(attr & DASHBIT)
		printf(" stroke-dasharray=\"%.3f, %.3f\"", xsc(ddval), xsc(ddval));
	else if(attr & DOTBIT)
		printf(" stroke-dasharray=\"1, %.3f\"", xsc(ddval));
	printf("/>\n");
}

void arrow(double x0, double y0, double x1, double y1, double w, double h,
	 double ang, int nhead) 	/* draw arrow (without shaft) */
{
	double alpha, rot, drot, hyp;
	double dx, dy;
	int i;

	rot = atan2(w / 2, h);
	hyp = sqrt(w/2 * w/2 + h * h);
	alpha = atan2(y1-y0, x1-x0) + ang;
	if (nhead < 2)
		nhead = 2;
	dprintf("rot=%g, hyp=%g, alpha=%g\n", rot, hyp, alpha);
	printf("<path d=\"");
	for (i = 1; i >= 0; i--) {
		drot = 2 * rot / (double) (2-1) * (double) i;
		dx = hyp * cos(alpha + PI - rot + drot);
		dy = hyp * sin(alpha + PI - rot + drot);
		dprintf("dx,dy = %g,%g\n", dx, dy);
		if(i == 1)
			printf("M %.3f %.3f L %.3f %.3f", xconv(x1+dx), yconv(y1+dy), xconv(x1), yconv(y1));
		else
			printf(" L %.3f %.3f", xconv(x1+dx), yconv(y1+dy));
	}
	if (nhead > 2)
		printf(" Z");
	printf("\"");
	if(nhead > 3)
		printf(" fill=\"black\" stroke=\"black\"");
	else if(nhead == 3)
		printf(" fill=\"white\" stroke=\"black\"");
	else
		printf(" fill=\"transparent\" stroke=\"black\"");
	printf("/>\n");
}

double lastgray = 0;

void fillstart(double v, int vis, int fill)
{
	int x;

	if(fill) {
		x = (int)(v*255.0);
		sprintf(svgfill, "#%02x%02x%02x", x, x, x);
	} else
		strcpy(svgfill, "transparent");
	if(vis)
		strcpy(svgstroke, "black");
	else
		strcpy(svgstroke, "transparent");
}

void fillend(void)
{
	strcpy(svgfill, "transparent");
	strcpy(svgstroke, "black");
}

void box(double x0, double y0, double x1, double y1, int attr, double ddval)
{
	printf("<path d=\"M %.3f %.3f V %.3f H %.3f V %.3f Z\" fill=\"transparent\" stroke=\"black\"", xconv(x0), yconv(y0), yconv(y1), xconv(x1), yconv(y0));
	if(attr & DASHBIT)
		printf(" stroke-dasharray=\"%.3f, %.3f\"", xsc(ddval), xsc(ddval));
	else if(attr & DOTBIT)
		printf(" stroke-dasharray=\"1, %.3f\"", xsc(ddval));
	printf("/>\n");

}

void circle(double x, double y, double r)
{
	printf("<circle cx=\"%.3f\" cy=\"%.3f\" r=\"%.3f\" fill=\"%s\" stroke=\"%s\"/>\n", xconv(x), yconv(y), xsc(r), svgfill, svgstroke);
}

void spline(double x, double y, double n, ofloat *p, int attr, double ddval)
{
	int i;
	double x1, y1;

	printf("<path d=\"M %.3f %.3f", xconv(x), yconv(y));
	x1 = 0;
	y1 = 0;
	for (i = 0; i < 2 * n; i += 2) {
		x1 = x;
		y1 = y;
		x += p[i];
		y += p[i+1];
		if(i == 0)
			printf(" L %.3f %.3f", xconv((x+x1)/2), yconv((y+y1)/2));
		else
			printf(" Q %.3f %.3f %.3f %.3f", xconv(x1), yconv(y1), xconv((x+x1)/2), yconv((y+y1)/2));
	}
	printf(" L %.3f %.3f", xconv(x), yconv(y));
	printf("\" fill=\"%s\" stroke=\"%s\"", svgfill, svgstroke);
	if(attr & DASHBIT)
		printf(" stroke-dasharray=\"%.3f, %.3f\"", xsc(ddval), xsc(ddval));
	else if(attr & DOTBIT)
		printf(" stroke-dasharray=\"1, %.3f\"", xsc(ddval));
	printf("/>\n");
}

void ellipse(double x, double y, double r1, double r2)
{
	printf("<ellipse cx=\"%.3f\" cy=\"%.3f\" rx=\"%.3f\" ry=\"%.3f\" fill=\"%s\" stroke=\"%s\"/>\n", xconv(x), yconv(y), xsc(r1), ysc(r2), svgfill, svgstroke);
}

void arc(double x, double y, double x0, double y0, double x1, double y1, double r)	/* draw arc with center x,y */
{
	printf("<path d=\"M %.3f %.3f A %.3f %.3f %d %d %d %.3f %.3f\" fill=\"%s\" stroke=\"%s\"/>\n",
		xconv(x0), yconv(y0),
		xsc(r), ysc(r), 0, 0, 0, xconv(x1), yconv(y1),
		svgfill, svgstroke);
}