ref: 3b7e03a30ed29ee0666c00568bf67b8179c28d12
dir: /sys/src/cmd/pic/print.c/
#include <stdio.h>
#include <math.h>
#include "pic.h"
#include "y.tab.h"
void dotext(obj *);
void dotline(double, double, double, double, int, double);
void dotbox(double, double, double, double, int, double);
void ellipse(double, double, double, double);
void circle(double, double, double);
void arc(double, double, double, double, double, double);
void arrow(double, double, double, double, double, double, double, int);
void line(double, double, double, double);
void box(double, double, double, double);
void spline(double x, double y, double n, ofloat *p, int dashed, double ddval);
void move(double, double);
void troff(char *);
void dot(void);
void fillstart(double), fillend(int vis, int noedge);
void print(void)
{
obj *p;
int i, j, k, m;
int fill, vis, invis;
double x0, y0, x1, y1, ox, oy, dx, dy, ndx, ndy;
for (i = 0; i < nobj; i++) {
p = objlist[i];
ox = p->o_x;
oy = p->o_y;
if (p->o_count >= 1)
x1 = p->o_val[0];
if (p->o_count >= 2)
y1 = p->o_val[1];
m = p->o_mode;
fill = p->o_attr & FILLBIT;
invis = p->o_attr & INVIS;
vis = !invis;
switch (p->o_type) {
case TROFF:
troff(text[p->o_nt1].t_val);
break;
case BOX:
case BLOCK:
x0 = ox - x1 / 2;
y0 = oy - y1 / 2;
x1 = ox + x1 / 2;
y1 = oy + y1 / 2;
if (fill) {
move(x0, y0);
fillstart(p->o_fillval);
}
if (p->o_type == BLOCK)
; /* nothing at all */
else if (invis && !fill)
; /* nothing at all */
else if (p->o_attr & (DOTBIT|DASHBIT))
dotbox(x0, y0, x1, y1, p->o_attr, p->o_ddval);
else
box(x0, y0, x1, y1);
if (fill)
fillend(vis, fill);
move(ox, oy);
dotext(p); /* if there are any text strings */
if (ishor(m))
move(isright(m) ? x1 : x0, oy); /* right side */
else
move(ox, isdown(m) ? y0 : y1); /* bottom */
break;
case BLOCKEND:
break;
case CIRCLE:
if (fill)
fillstart(p->o_fillval);
if (vis || fill)
circle(ox, oy, x1);
if (fill)
fillend(vis, fill);
move(ox, oy);
dotext(p);
if (ishor(m))
move(ox + isright(m) ? x1 : -x1, oy);
else
move(ox, oy + isup(m) ? x1 : -x1);
break;
case ELLIPSE:
if (fill)
fillstart(p->o_fillval);
if (vis || fill)
ellipse(ox, oy, x1, y1);
if (fill)
fillend(vis, fill);
move(ox, oy);
dotext(p);
if (ishor(m))
move(ox + isright(m) ? x1 : -x1, oy);
else
move(ox, oy - isdown(m) ? y1 : -y1);
break;
case ARC:
if (fill) {
move(ox, oy);
fillstart(p->o_fillval);
}
if (p->o_attr & HEAD1)
arrow(x1 - (y1 - oy), y1 + (x1 - ox),
x1, y1, p->o_val[4], p->o_val[5], p->o_val[5]/p->o_val[6]/2, p->o_nhead);
if (invis && !fill)
/* probably wrong when it's cw */
move(x1, y1);
else
arc(ox, oy, x1, y1, p->o_val[2], p->o_val[3]);
if (p->o_attr & HEAD2)
arrow(p->o_val[2] + p->o_val[3] - oy, p->o_val[3] - (p->o_val[2] - ox),
p->o_val[2], p->o_val[3], p->o_val[4], p->o_val[5], -p->o_val[5]/p->o_val[6]/2, p->o_nhead);
if (fill)
fillend(vis, fill);
if (p->o_attr & CW_ARC)
move(x1, y1); /* because drawn backwards */
move(ox, oy);
dotext(p);
break;
case LINE:
case ARROW:
case SPLINE:
if (fill) {
move(ox, oy);
fillstart(p->o_fillval);
}
if (vis && p->o_attr & HEAD1)
arrow(ox + p->o_val[5], oy + p->o_val[6], ox, oy, p->o_val[2], p->o_val[3], 0.0, p->o_nhead);
if (invis && !fill)
move(x1, y1);
else if (p->o_type == SPLINE)
spline(ox, oy, p->o_val[4], &p->o_val[5], p->o_attr & (DOTBIT|DASHBIT), p->o_ddval);
else {
dx = ox;
dy = oy;
for (k=0, j=5; k < p->o_val[4]; k++, j += 2) {
ndx = dx + p->o_val[j];
ndy = dy + p->o_val[j+1];
if (p->o_attr & (DOTBIT|DASHBIT))
dotline(dx, dy, ndx, ndy, p->o_attr, p->o_ddval);
else
line(dx, dy, ndx, ndy);
dx = ndx;
dy = ndy;
}
}
if (vis && p->o_attr & HEAD2) {
dx = ox;
dy = oy;
for (k = 0, j = 5; k < p->o_val[4] - 1; k++, j += 2) {
dx += p->o_val[j];
dy += p->o_val[j+1];
}
arrow(dx, dy, x1, y1, p->o_val[2], p->o_val[3], 0.0, p->o_nhead);
}
if (fill)
fillend(vis, fill);
move((ox + x1)/2, (oy + y1)/2); /* center */
dotext(p);
break;
case MOVE:
move(ox, oy);
break;
case TEXT:
move(ox, oy);
if (vis)
dotext(p);
break;
}
}
}
void dotline(double x0, double y0, double x1, double y1, int ddtype, double ddval) /* dotted line */
{
static double prevval = 0.05; /* 20 per inch by default */
int i, numdots;
double a, b, dx, dy;
if (ddval == 0)
ddval = prevval;
prevval = ddval;
/* don't save dot/dash value */
dx = x1 - x0;
dy = y1 - y0;
if (ddtype & DOTBIT) {
numdots = sqrt(dx*dx + dy*dy) / prevval + 0.5;
if (numdots > 0)
for (i = 0; i <= numdots; i++) {
a = (double) i / (double) numdots;
move(x0 + (a * dx), y0 + (a * dy));
dot();
}
} else if (ddtype & DASHBIT) {
double d, dashsize, spacesize;
d = sqrt(dx*dx + dy*dy);
if (d <= 2 * prevval) {
line(x0, y0, x1, y1);
return;
}
numdots = d / (2 * prevval) + 1; /* ceiling */
dashsize = prevval;
spacesize = (d - numdots * dashsize) / (numdots - 1);
for (i = 0; i < numdots-1; i++) {
a = i * (dashsize + spacesize) / d;
b = a + dashsize / d;
line(x0 + (a*dx), y0 + (a*dy), x0 + (b*dx), y0 + (b*dy));
a = b;
b = a + spacesize / d;
move(x0 + (a*dx), y0 + (a*dy));
}
line(x0 + (b * dx), y0 + (b * dy), x1, y1);
}
prevval = 0.05;
}
void dotbox(double x0, double y0, double x1, double y1, int ddtype, double ddval) /* dotted or dashed box */
{
dotline(x0, y0, x1, y0, ddtype, ddval);
dotline(x1, y0, x1, y1, ddtype, ddval);
dotline(x1, y1, x0, y1, ddtype, ddval);
dotline(x0, y1, x0, y0, ddtype, ddval);
}
void dotext(obj *p) /* print text strings of p in proper vertical spacing */
{
int i, nhalf;
void label(char *, int, int);
nhalf = p->o_nt2 - p->o_nt1 - 1;
for (i = p->o_nt1; i < p->o_nt2; i++) {
label(text[i].t_val, text[i].t_type, nhalf);
nhalf -= 2;
}
}