ref: 3a41ce3bf314caad67c2c52a06142f7ac60611c7
dir: /sys/src/cmd/pic/misc.c/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include "pic.h"
#include "y.tab.h"
int whatpos(obj *p, int corner, double *px, double *py);
void makeattr(int type, int sub, YYSTYPE val);
YYSTYPE getblk(obj *, char *);
setdir(int n) /* set direction (hvmode) from LEFT, RIGHT, etc. */
{
switch (n) {
case UP: hvmode = U_DIR; break;
case DOWN: hvmode = D_DIR; break;
case LEFT: hvmode = L_DIR; break;
case RIGHT: hvmode = R_DIR; break;
}
return(hvmode);
}
curdir(void) /* convert current dir (hvmode) to RIGHT, LEFT, etc. */
{
switch (hvmode) {
case R_DIR: return RIGHT;
case L_DIR: return LEFT;
case U_DIR: return UP;
case D_DIR: return DOWN;
}
ERROR "can't happen curdir" FATAL;
return 0;
}
double getcomp(obj *p, int t) /* return component of a position */
{
switch (t) {
case DOTX:
return p->o_x;
case DOTY:
return p->o_y;
case DOTWID:
switch (p->o_type) {
case BOX:
case BLOCK:
case TEXT:
return p->o_val[0];
case CIRCLE:
case ELLIPSE:
return 2 * p->o_val[0];
case LINE:
case ARROW:
return p->o_val[0] - p->o_x;
case PLACE:
return 0;
}
case DOTHT:
switch (p->o_type) {
case BOX:
case BLOCK:
case TEXT:
return p->o_val[1];
case CIRCLE:
case ELLIPSE:
return 2 * p->o_val[1];
case LINE:
case ARROW:
return p->o_val[1] - p->o_y;
case PLACE:
return 0;
}
case DOTRAD:
switch (p->o_type) {
case CIRCLE:
case ELLIPSE:
return p->o_val[0];
}
}
ERROR "you asked for a weird dimension or position" WARNING;
return 0;
}
double exprlist[100];
int nexpr = 0;
void exprsave(double f)
{
exprlist[nexpr++] = f;
}
char *sprintgen(char *fmt)
{
char buf[1000];
sprintf(buf, fmt, exprlist[0], exprlist[1], exprlist[2], exprlist[3], exprlist[4]);
nexpr = 0;
free(fmt);
return tostring(buf);
}
void makefattr(int type, int sub, double f) /* double attr */
{
YYSTYPE val;
val.f = f;
makeattr(type, sub, val);
}
void makeoattr(int type, obj *o) /* obj* attr */
{
YYSTYPE val;
val.o = o;
makeattr(type, 0, val);
}
void makeiattr(int type, int i) /* int attr */
{
YYSTYPE val;
val.i = i;
makeattr(type, 0, val);
}
void maketattr(int sub, char *p) /* text attribute: takes two */
{
YYSTYPE val;
val.p = p;
makeattr(TEXTATTR, sub, val);
}
void addtattr(int sub) /* add text attrib to existing item */
{
attr[nattr-1].a_sub |= sub;
}
void makevattr(char *p) /* varname attribute */
{
YYSTYPE val;
val.p = p;
makeattr(VARNAME, 0, val);
}
void makeattr(int type, int sub, YYSTYPE val) /* add attribute type and val */
{
if (type == 0 && val.i == 0) { /* clear table for next stat */
nattr = 0;
return;
}
if (nattr >= nattrlist)
attr = (Attr *) grow((char *)attr, "attr", nattrlist += 100, sizeof(Attr));
dprintf("attr %d: %d %d %d\n", nattr, type, sub, val.i);
attr[nattr].a_type = type;
attr[nattr].a_sub = sub;
attr[nattr].a_val = val;
nattr++;
}
void printexpr(double f) /* print expression for debugging */
{
printf("%g\n", f);
}
void printpos(obj *p) /* print position for debugging */
{
printf("%g, %g\n", p->o_x, p->o_y);
}
char *tostring(char *s)
{
register char *p;
p = malloc(strlen(s)+1);
if (p == NULL)
ERROR "out of space in tostring on %s", s FATAL;
strcpy(p, s);
return(p);
}
obj *makepos(double x, double y) /* make a position cell */
{
obj *p;
p = makenode(PLACE, 0);
p->o_x = x;
p->o_y = y;
return(p);
}
obj *makebetween(double f, obj *p1, obj *p2) /* make position between p1 and p2 */
{
obj *p;
dprintf("fraction = %.2f\n", f);
p = makenode(PLACE, 0);
p->o_x = p1->o_x + f * (p2->o_x - p1->o_x);
p->o_y = p1->o_y + f * (p2->o_y - p1->o_y);
return(p);
}
obj *getpos(obj *p, int corner) /* find position of point */
{
double x, y;
whatpos(p, corner, &x, &y);
return makepos(x, y);
}
int whatpos(obj *p, int corner, double *px, double *py) /* what is the position (no side effect) */
{
double x, y, x1, y1;
if (p == NULL)
ERROR "null object" FATAL;
dprintf("whatpos %o %d %d\n", p, p->o_type, corner);
x = p->o_x;
y = p->o_y;
if (p->o_type != PLACE && p->o_type != MOVE) {
x1 = p->o_val[0];
y1 = p->o_val[1];
}
switch (p->o_type) {
case PLACE:
break;
case BOX:
case BLOCK:
case TEXT:
switch (corner) {
case NORTH: y += y1 / 2; break;
case SOUTH: y -= y1 / 2; break;
case EAST: x += x1 / 2; break;
case WEST: x -= x1 / 2; break;
case NE: x += x1 / 2; y += y1 / 2; break;
case SW: x -= x1 / 2; y -= y1 / 2; break;
case SE: x += x1 / 2; y -= y1 / 2; break;
case NW: x -= x1 / 2; y += y1 / 2; break;
case START:
if (p->o_type == BLOCK)
return whatpos(objlist[(int)p->o_val[2]], START, px, py);
case END:
if (p->o_type == BLOCK)
return whatpos(objlist[(int)p->o_val[3]], END, px, py);
}
break;
case ARC:
switch (corner) {
case START:
if (p->o_attr & CW_ARC) {
x = p->o_val[2]; y = p->o_val[3];
} else {
x = x1; y = y1;
}
break;
case END:
if (p->o_attr & CW_ARC) {
x = x1; y = y1;
} else {
x = p->o_val[2]; y = p->o_val[3];
}
break;
}
if (corner == START || corner == END)
break;
x1 = y1 = sqrt((x1-x)*(x1-x) + (y1-y)*(y1-y));
/* Fall Through! */
case CIRCLE:
case ELLIPSE:
switch (corner) {
case NORTH: y += y1; break;
case SOUTH: y -= y1; break;
case EAST: x += x1; break;
case WEST: x -= x1; break;
case NE: x += 0.707 * x1; y += 0.707 * y1; break;
case SE: x += 0.707 * x1; y -= 0.707 * y1; break;
case NW: x -= 0.707 * x1; y += 0.707 * y1; break;
case SW: x -= 0.707 * x1; y -= 0.707 * y1; break;
}
break;
case LINE:
case SPLINE:
case ARROW:
switch (corner) {
case START: break; /* already in place */
case END: x = x1; y = y1; break;
default: /* change! */
case CENTER: x = (x+x1)/2; y = (y+y1)/2; break;
case NORTH: if (y1 > y) { x = x1; y = y1; } break;
case SOUTH: if (y1 < y) { x = x1; y = y1; } break;
case EAST: if (x1 > x) { x = x1; y = y1; } break;
case WEST: if (x1 < x) { x = x1; y = y1; } break;
}
break;
case MOVE:
/* really ought to be same as line... */
break;
}
dprintf("whatpos returns %g %g\n", x, y);
*px = x;
*py = y;
return 1;
}
obj *gethere(void) /* make a place for curx,cury */
{
dprintf("gethere %g %g\n", curx, cury);
return(makepos(curx, cury));
}
obj *getlast(int n, int t) /* find n-th previous occurrence of type t */
{
int i, k;
obj *p;
k = n;
for (i = nobj-1; i >= 0; i--) {
p = objlist[i];
if (p->o_type == BLOCKEND) {
i = p->o_val[4];
continue;
}
if (p->o_type != t)
continue;
if (--k > 0)
continue; /* not there yet */
dprintf("got a last of x,y= %g,%g\n", p->o_x, p->o_y);
return(p);
}
ERROR "there is no %dth last", n FATAL;
return(NULL);
}
obj *getfirst(int n, int t) /* find n-th occurrence of type t */
{
int i, k;
obj *p;
k = n;
for (i = 0; i < nobj; i++) {
p = objlist[i];
if (p->o_type == BLOCK && t != BLOCK) { /* skip whole block */
i = p->o_val[5] + 1;
continue;
}
if (p->o_type != t)
continue;
if (--k > 0)
continue; /* not there yet */
dprintf("got a first of x,y= %g,%g\n", p->o_x, p->o_y);
return(p);
}
ERROR "there is no %dth ", n FATAL;
return(NULL);
}
double getblkvar(obj *p, char *s) /* find variable s2 in block p */
{
YYSTYPE y;
y = getblk(p, s);
return y.f;
}
obj *getblock(obj *p, char *s) /* find variable s in block p */
{
YYSTYPE y;
y = getblk(p, s);
return y.o;
}
YYSTYPE getblk(obj *p, char *s) /* find union type for s in p */
{
static YYSTYPE bug;
struct symtab *stp;
if (p->o_type != BLOCK) {
ERROR ".%s is not in that block", s WARNING;
return(bug);
}
for (stp = p->o_symtab; stp != NULL; stp = stp->s_next)
if (strcmp(s, stp->s_name) == 0) {
dprintf("getblk %s found x,y= %g,%g\n",
s, (stp->s_val.o)->o_x, (stp->s_val.o)->o_y);
return(stp->s_val);
}
ERROR "there is no .%s in that []", s WARNING;
return(bug);
}
obj *fixpos(obj *p, double x, double y)
{
dprintf("fixpos returns %g %g\n", p->o_x + x, p->o_y + y);
return makepos(p->o_x + x, p->o_y + y);
}
obj *addpos(obj *p, obj *q)
{
dprintf("addpos returns %g %g\n", p->o_x+q->o_x, p->o_y+q->o_y);
return makepos(p->o_x+q->o_x, p->o_y+q->o_y);
}
obj *subpos(obj *p, obj *q)
{
dprintf("subpos returns %g %g\n", p->o_x-q->o_x, p->o_y-q->o_y);
return makepos(p->o_x-q->o_x, p->o_y-q->o_y);
}
obj *makenode(int type, int n)
{
obj *p;
p = (obj *) calloc(1, sizeof(obj) + (n-1)*sizeof(ofloat));
if (p == NULL)
ERROR "out of space in makenode" FATAL;
p->o_type = type;
p->o_count = n;
p->o_nobj = nobj;
p->o_mode = hvmode;
p->o_x = curx;
p->o_y = cury;
p->o_nt1 = ntext1;
p->o_nt2 = ntext;
ntext1 = ntext; /* ready for next caller */
if (nobj >= nobjlist)
objlist = (obj **) grow((char *) objlist, "objlist",
nobjlist *= 2, sizeof(obj *));
objlist[nobj++] = p;
return(p);
}
void extreme(double x, double y) /* record max and min x and y values */
{
if (x > xmax)
xmax = x;
if (y > ymax)
ymax = y;
if (x < xmin)
xmin = x;
if (y < ymin)
ymin = y;
}