ref: 53d55013598d7cd214d01cbf0b026844fe7ca8d2
dir: /sys/src/cmd/proof/htroff.c/
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <cursor.h>
#include <event.h>
#include <bio.h>
#include "proof.h"
int res;
int hpos;
int vpos;
int DIV = 11;
Point offset;
Point xyoffset = { 0,0 };
Rectangle view[MAXVIEW];
Rectangle bound[MAXVIEW]; /* extreme points */
int nview = 1;
int lastp; /* last page number we were on */
#define NPAGENUMS 200
struct pagenum {
int num;
long adr;
} pagenums[NPAGENUMS];
int npagenums;
int curfont, cursize;
char *getcmdstr(void);
static void initpage(void);
static void view_setup(int);
static Point scale(Point);
static void clearview(Rectangle);
static int addpage(int);
static void spline(Image *, int, Point *);
static int skipto(int, int);
static void wiggly(int);
static void devcntrl(void);
static void eatline(void);
static int getn(void);
static int botpage(int);
static void getstr(char *);
#define Do screen->r.min
#define Dc screen->r.max
/* declarations and definitions of font stuff are in font.c and main.c */
static void
initpage(void)
{
int i;
view_setup(nview);
for (i = 0; i < nview-1; i++)
draw(screen, view[i], screen, nil, view[i+1].min);
clearview(view[nview-1]);
offset = view[nview-1].min;
vpos = 0;
}
static void
view_setup(int n)
{
int i, j, v, dx, dy, r, c;
switch (n) {
case 1: r = 1; c = 1; break;
case 2: r = 1; c = 2; break;
case 3: r = 1; c = 3; break;
case 4: r = 2; c = 2; break;
case 5: case 6: r = 2; c = 3; break;
case 7: case 8: case 9: r = 3; c = 3; break;
default: r = (n+2)/3; c = 3; break; /* finking out */
}
dx = (Dc.x - Do.x) / c;
dy = (Dc.y - Do.y) / r;
v = 0;
for (i = 0; i < r && v < n; i++)
for (j = 0; j < c && v < n; j++) {
view[v] = screen->r;
view[v].min.x = Do.x + j * dx;
view[v].max.x = Do.x + (j+1) * dx;
view[v].min.y = Do.y + i * dy;
view[v].max.y = Do.y + (i+1) * dy;
v++;
}
}
static void
clearview(Rectangle r)
{
draw(screen, r, display->white, nil, r.min);
}
int resized;
void eresized(int new)
{
/* this is called if we are resized */
if(new && getwindow(display, Refnone) < 0)
drawerror(display, "can't reattach to window");
initpage();
resized = 1;
}
static Point
scale(Point p)
{
p.x /= DIV;
p.y /= DIV;
return addpt(xyoffset, addpt(offset,p));
}
static int
addpage(int n)
{
int i;
for (i = 0; i < npagenums; i++)
if (n == pagenums[i].num)
return i;
if (npagenums < NPAGENUMS-1) {
pagenums[npagenums].num = n;
pagenums[npagenums].adr = offsetc();
npagenums++;
}
return npagenums;
}
void
readpage(void)
{
int c, i, a, alpha, phi;
static int first = 0;
int m, n, gonow = 1;
Rune r[32], t;
Point p,q,qq;
offset = screen->clipr.min;
esetcursor(&deadmouse);
while (gonow)
{
c = getc();
switch (c)
{
case -1:
esetcursor(0);
if (botpage(lastp+1)) {
initpage();
break;
}
exits(0);
case 'p': /* new page */
lastp = getn();
addpage(lastp);
if (first++ > 0) {
esetcursor(0);
botpage(lastp);
esetcursor(&deadmouse);
}
initpage();
break;
case '\n': /* when input is text */
case ' ':
case 0: /* occasional noise creeps in */
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
/* two motion digits plus a character */
hpos += (c-'0')*10 + getc()-'0';
/* FALLS THROUGH */
case 'c': /* single ascii character */
r[0] = getrune();
r[1] = 0;
dochar(r);
break;
case 'C':
for(i=0; ; i++){
t = getrune();
if(isspace(t))
break;
r[i] = t;
}
r[i] = 0;
dochar(r);
break;
case 'N':
r[0] = getn();
r[1] = 0;
dochar(r);
break;
case 'D': /* draw function */
switch (getc())
{
case 'l': /* draw a line */
n = getn();
m = getn();
p = Pt(hpos,vpos);
q = addpt(p, Pt(n,m));
hpos += n;
vpos += m;
line(screen, scale(p), scale(q), 0, 0, 0, display->black, ZP);
break;
case 'c': /* circle */
/*nop*/
m = getn()/2;
p = Pt(hpos+m,vpos);
hpos += 2*m;
ellipse(screen, scale(p), m/DIV, m/DIV, 0, display->black, ZP);
/* p=currentpt; p.x+=dmap(m/2);circle bp,p,a,ONES,Mode*/
break;
case 'e': /* ellipse */
/*nop*/
m = getn()/2;
n = getn()/2;
p = Pt(hpos+m,vpos);
hpos += 2*m;
ellipse(screen, scale(p), m/DIV, n/DIV, 0, display->black, ZP);
break;
case 'a': /* arc */
p = scale(Pt(hpos,vpos));
n = getn();
m = getn();
hpos += n;
vpos += m;
q = scale(Pt(hpos,vpos));
n = getn();
m = getn();
hpos += n;
vpos += m;
qq = scale(Pt(hpos,vpos));
/*
* tricky: convert from 3-point clockwise to
* center, angle1, delta-angle counterclockwise.
*/
a = hypot(qq.x-q.x, qq.y-q.y);
phi = atan2(q.y-p.y, p.x-q.x)*180./PI;
alpha = atan2(q.y-qq.y, qq.x-q.x)*180./PI - phi;
if(alpha < 0)
alpha += 360;
arc(screen, q, a, a, 0, display->black, ZP, phi, alpha);
break;
case '~': /* wiggly line */
wiggly(0);
break;
default:
break;
}
eatline();
break;
case 's':
n = getn(); /* ignore fractional sizes */
if (cursize == n)
break;
cursize = n;
if (cursize >= NFONT)
cursize = NFONT-1;
break;
case 'f':
curfont = getn();
break;
case 'H': /* absolute horizontal motion */
hpos = getn();
break;
case 'h': /* relative horizontal motion */
hpos += getn();
break;
case 'w': /* word space */
break;
case 'V':
vpos = getn();
break;
case 'v':
vpos += getn();
break;
case '#': /* comment */
case 'n': /* end of line */
eatline();
break;
case 'x': /* device control */
devcntrl();
break;
default:
fprint(2, "unknown input character %o %c at offset %lud\n", c, c, offsetc());
exits("bad char");
}
}
esetcursor(0);
}
static void
spline(Image *b, int n, Point *pp)
{
long w, t1, t2, t3, fac=1000;
int i, j, steps=10;
Point p, q;
for (i = n; i > 0; i--)
pp[i] = pp[i-1];
pp[n+1] = pp[n];
n += 2;
p = pp[0];
for(i = 0; i < n-2; i++)
{
for(j = 0; j < steps; j++)
{
w = fac * j / steps;
t1 = w * w / (2 * fac);
w = w - fac/2;
t2 = 3*fac/4 - w * w / fac;
w = w - fac/2;
t3 = w * w / (2*fac);
q.x = (t1*pp[i+2].x + t2*pp[i+1].x +
t3*pp[i].x + fac/2) / fac;
q.y = (t1*pp[i+2].y + t2*pp[i+1].y +
t3*pp[i].y + fac/2) / fac;
line(b, p, q, 0, 0, 0, display->black, ZP);
p = q;
}
}
}
/* Have to parse skipped pages, to find out what fonts are loaded. */
static int
skipto(int gotop, int curp)
{
char *p;
int i;
if (gotop == curp)
return 1;
for (i = 0; i < npagenums; i++)
if (pagenums[i].num == gotop) {
if (seekc(pagenums[i].adr) == Beof) {
fprint(2, "can't rewind input\n");
return 0;
}
return 1;
}
if (gotop <= curp) {
restart:
if (seekc(0) == Beof) {
fprint(2, "can't rewind input\n");
return 0;
}
}
for(;;){
p = rdlinec();
if (p == 0) {
if(gotop>curp){
gotop = curp;
goto restart;
}
return 0;
} else if (*p == 'p') {
lastp = curp = atoi(p+1);
addpage(lastp); /* maybe 1 too high */
if (curp>=gotop)
return 1;
}
}
}
static void
wiggly(int skip)
{
Point p[300];
int c,i,n;
for (n = 1; (c = getc()) != '\n' && c>=0; n++) {
ungetc();
p[n].x = getn();
p[n].y = getn();
}
p[0] = Pt(hpos, vpos);
for (i = 1; i < n; i++)
p[i] = addpt(p[i],p[i-1]);
hpos = p[n-1].x;
vpos = p[n-1].y;
for (i = 0; i < n; i++)
p[i] = scale(p[i]);
if (!skip)
spline(screen,n,p);
}
static void
devcntrl(void) /* interpret device control functions */
{
char str[80];
int n;
getstr(str);
switch (str[0]) { /* crude for now */
case 'i': /* initialize */
break;
case 'T': /* device name */
getstr(devname);
break;
case 't': /* trailer */
break;
case 'p': /* pause -- can restart */
break;
case 's': /* stop */
break;
case 'r': /* resolution assumed when prepared */
res=getn();
DIV = floor(.5 + res/(100.0*mag));
if (DIV < 1)
DIV = 1;
mag = res/(100.0*DIV); /* adjust mag according to DIV coarseness */
break;
case 'f': /* font used */
n = getn();
getstr(str);
loadfontname(n, str);
break;
/* these don't belong here... */
case 'H': /* char height */
break;
case 'S': /* slant */
break;
case 'X':
break;
}
eatline();
}
int
isspace(int c)
{
return c==' ' || c=='\t' || c=='\n';
}
static void
getstr(char *is)
{
uchar *s = (uchar *) is;
for (*s = getc(); isspace(*s); *s = getc())
;
for (; !isspace(*s); *++s = getc())
;
ungetc();
*s = 0;
}
static void
eatline(void)
{
int c;
while ((c=getc()) != '\n' && c >= 0)
;
}
static int
getn(void)
{
int n, c, sign;
while (c = getc())
if (!isspace(c))
break;
if(c == '-'){
sign = -1;
c = getc();
}else
sign = 1;
for (n = 0; '0'<=c && c<='9'; c = getc())
n = n*10 + c - '0';
while (c == ' ')
c = getc();
ungetc();
return(n*sign);
}
static int
botpage(int np) /* called at bottom of page np-1 == top of page np */
{
char *p;
int n;
while (p = getcmdstr()) {
if (*p == '\0')
return 0;
if (*p == 'q')
exits(p);
if (*p == 'c') /* nop */
continue;
if (*p == 'm') {
mag = atof(p+1);
if (mag <= .1 || mag >= 10)
mag = DEFMAG;
allfree(); /* zap fonts */
DIV = floor(.5 + res/(100.0*mag));
if (DIV < 1)
DIV = 1;
mag = res/(100.0*DIV);
return skipto(np-1, np); /* reprint the page */
}
if (*p == 'x') {
xyoffset.x += atoi(p+1)*100;
skipto(np-1, np);
return 1;
}
if (*p == 'y') {
xyoffset.y += atoi(p+1)*100;
skipto(np-1, np);
return 1;
}
if (*p == '/') { /* divide into n pieces */
nview = atoi(p+1);
if (nview < 1)
nview = 1;
else if (nview > MAXVIEW)
nview = MAXVIEW;
return skipto(np-1, np);
}
if (*p == 'p') {
if (p[1] == '\0'){ /* bare 'p' */
if(skipto(np-1, np))
return 1;
continue;
}
p++;
}
if ('0'<=*p && *p<='9') {
n = atoi(p);
if(skipto(n, np))
return 1;
continue;
}
if (*p == '-' || *p == '+') {
n = atoi(p);
if (n == 0)
n = *p == '-' ? -1 : 1;
if(skipto(np - 1 + n, np))
return 1;
continue;
}
if (*p == 'd') {
dbg = 1 - dbg;
continue;
}
fprint(2, "illegal: try q, 17, +2, -1, p, m.7, /2, x1, y-.5 or return\n");
}
return 0;
}