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lsys.c
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C/C++ Source or Header
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1993-02-18
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22KB
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896 lines
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#ifdef __TURBOC__
#include <alloc.h>
#elif !defined(__386BSD__)
#include <malloc.h>
#endif
#include "fractint.h"
#include "prototyp.h"
#define size ssize
/* Needed for use of asm -- helps decide which pointer to function
* to put into the struct lsys_cmds.
*/
extern int cpu;
extern int fpu;
extern int debugflag;
extern int xdots,ydots;
extern int colors;
extern char LFileName[];
extern char LName[];
extern double param[];
extern int overflow;
extern float screenaspect;
struct lsys_cmd {
char ch;
void (*f)(long n);
long n;
};
static double _fastcall getnumber(char far **);
static struct lsys_cmd far * _fastcall findsize(struct lsys_cmd far *,struct lsys_cmd far **,int);
static int _fastcall findscale(struct lsys_cmd far *, struct lsys_cmd far **, int);
static struct lsys_cmd far * _fastcall drawLSys(struct lsys_cmd far *, struct lsys_cmd far **, int);
static int _fastcall readLSystemFile(char *);
static void _fastcall free_rules_mem(void);
static int _fastcall save_rule(char *,char far **);
static struct lsys_cmd far *SizeTransform(char far *s);
static struct lsys_cmd far *DrawTransform(char far *s);
static void free_lcmds();
static long aspect; /* aspect ratio of each pixel, ysize/xsize */
/* Some notes to Adrian from PB, made when I integrated with v15:
printfs changed to work with new user interface
bug at end of readLSystemFile, the line which said rulind=0 fixed
to say *rulind=0
the calloc was not worthwhile, it was just for a 54 byte area, cheaper
to keep it as a static; but there was a static 201 char buffer I
changed to not be static
use of strdup was a nono, caused problems running out of space cause
the memory allocated each time was never freed; I've changed to
use far memory and to free when done
*/
long sins[50];
long coss[50];
/* dmaxangle is maxangle - 1. */
char maxangle,dmaxangle,curcolor;
long size;
unsigned long realangle;
long xpos,ypos;
char counter,angle,reverse,stackoflow;
long lsys_Xmin, lsys_Xmax, lsys_Ymin, lsys_Ymax;
/* Macro to take an FP number and turn it into a
* 16/16-bit fixed-point number.
*/
#define FIXEDMUL 524288L
#define FIXEDPT(x) ((long) (FIXEDMUL * (x)))
/* The number by which to multiply sines, cosines and other
* values with magnitudes less than or equal to 1.
* sins and coss are a 3/29 bit fixed-point scheme (so the
* range is +/- 2, with good accuracy. The range is to
* avoid overflowing when the aspect ratio is taken into
* account.
*/
#define FIXEDLT1 536870912.0
/* Multiply by this number to convert an unsigned 32-bit long
* to an angle from 0-2PI.
*/
#define ANGLE2DOUBLE (2*PI / 4294967296.)
static int ispow2(long n)
{
return (n == (n & -n));
}
#ifdef XFRACT
static void lsys_doplus(long n)
{
if (reverse) {
if (++angle == maxangle)
angle = 0;
}
else {
if (angle)
angle--;
else
angle = dmaxangle;
}
}
#endif
#ifdef XFRACT
/* This is the same as lsys_doplus, except maxangle is a power of 2. */
static void lsys_doplus_pow2(long n)
{
if (reverse) {
angle++;
angle &= dmaxangle;
}
else {
angle--;
angle &= dmaxangle;
}
}
#endif
#ifdef XFRACT
static void lsys_dominus(long n)
{
if (reverse) {
if (angle)
angle--;
else
angle = dmaxangle;
}
else {
if (++angle == maxangle)
angle = 0;
}
}
#endif
#ifdef XFRACT
static void lsys_dominus_pow2(long n)
{
if (reverse) {
angle--;
angle &= dmaxangle;
}
else {
angle++;
angle &= dmaxangle;
}
}
#endif
static void lsys_doslash(long n)
{
if (reverse)
realangle -= n;
else
realangle += n;
}
#ifdef XFRACT
#define lsys_doslash_386 lsys_doslash
#endif
static void lsys_dobslash(long n)
{
if (reverse)
realangle += n;
else
realangle -= n;
}
#ifdef XFRACT
#define lsys_dobslash_386 lsys_dobslash
#endif
static void lsys_doat(long n)
{
size = multiply(size, n, 19);
}
#ifdef XFRACT
#define lsys_doat_386 lsys_doat
#endif
static void lsys_dopipe(long n)
{
angle += maxangle / 2;
angle %= maxangle;
}
#ifdef XFRACT
static void lsys_dopipe_pow2(long n)
{
angle += maxangle >> 1;
angle &= dmaxangle;
}
#endif
#ifdef XFRACT
static void lsys_dobang(long n)
{
reverse = ! reverse;
}
#endif
static void lsys_dosizedm(long n)
{
double angle = (double) realangle * ANGLE2DOUBLE;
double s, c;
long fixedsin, fixedcos;
FPUsincos(&angle, &s, &c);
fixedsin = (long) (s * FIXEDLT1);
fixedcos = (long) (c * FIXEDLT1);
xpos += multiply(multiply(size, aspect, 19), fixedcos, 29);
ypos += multiply(size, fixedsin, 29);
/* xpos+=size*aspect*cos(realangle*PI/180); */
/* ypos+=size*sin(realangle*PI/180); */
if (xpos>lsys_Xmax) lsys_Xmax=xpos;
if (ypos>lsys_Ymax) lsys_Ymax=ypos;
if (xpos<lsys_Xmin) lsys_Xmin=xpos;
if (ypos<lsys_Ymin) lsys_Ymin=ypos;
}
static void lsys_dosizegf(long n)
{
xpos += multiply(size, (long) coss[angle], 29);
ypos += multiply(size, (long) sins[angle], 29);
/* xpos+=size*coss[angle]; */
/* ypos+=size*sins[angle]; */
if (xpos>lsys_Xmax) lsys_Xmax=xpos;
if (ypos>lsys_Ymax) lsys_Ymax=ypos;
if (xpos<lsys_Xmin) lsys_Xmin=xpos;
if (ypos<lsys_Ymin) lsys_Ymin=ypos;
}
#ifdef XFRACT
#define lsys_dosizegf_386 lsys_dosizegf
#endif
static void lsys_dodrawd(long n)
{
double angle = (double) realangle * ANGLE2DOUBLE;
double s, c;
long fixedsin, fixedcos;
int lastx, lasty;
FPUsincos(&angle, &s, &c);
fixedsin = (long) (s * FIXEDLT1);
fixedcos = (long) (c * FIXEDLT1);
lastx=(int) (xpos >> 19);
lasty=(int) (ypos >> 19);
xpos += multiply(multiply(size, aspect, 19), fixedcos, 29);
ypos += multiply(size, fixedsin, 29);
/* xpos+=size*aspect*cos(realangle*PI/180); */
/* ypos+=size*sin(realangle*PI/180); */
draw_line(lastx,lasty,(int)(xpos >> 19),(int)(ypos>>19),curcolor);
}
static void lsys_dodrawm(long n)
{
double angle = (double) realangle * ANGLE2DOUBLE;
double s, c;
long fixedsin, fixedcos;
FPUsincos(&angle, &s, &c);
fixedsin = (long) (s * FIXEDLT1);
fixedcos = (long) (c * FIXEDLT1);
/* xpos+=size*aspect*cos(realangle*PI/180); */
/* ypos+=size*sin(realangle*PI/180); */
xpos += multiply(multiply(size, aspect, 19), fixedcos, 29);
ypos += multiply(size, fixedsin, 29);
}
static void lsys_dodrawg(long n)
{
xpos += multiply(size, (long) coss[angle], 29);
ypos += multiply(size, (long) sins[angle], 29);
/* xpos+=size*coss[angle]; */
/* ypos+=size*sins[angle]; */
}
#ifdef XFRACT
#define lsys_dodrawg_386 lsys_dodrawg
#endif
static void lsys_dodrawf(long n)
{
int lastx = (int) (xpos >> 19);
int lasty = (int) (ypos >> 19);
xpos += multiply(size, (long) coss[angle], 29);
ypos += multiply(size, (long) sins[angle], 29);
/* xpos+=size*coss[angle]; */
/* ypos+=size*sins[angle]; */
draw_line(lastx,lasty,(int)(xpos>>19),(int)(ypos>>19),curcolor);
}
static void lsys_dodrawc(long n)
{
curcolor = ((int) n) % colors;
}
static void lsys_dodrawgt(long n)
{
curcolor -= n;
if ((curcolor &= colors-1) == 0)
curcolor = colors-1;
}
static void lsys_dodrawlt(long n)
{
curcolor += n;
if ((curcolor &= colors-1) == 0)
curcolor = 1;
}
static double _fastcall getnumber(char far **str)
{
char numstr[30];
float ret;
int i,root,inverse;
root=0;
inverse=0;
strcpy(numstr,"");
(*str)++;
switch (**str)
{
case 'q':
root=1;
(*str)++;
break;
case 'i':
inverse=1;
(*str)++;
break;
}
switch (**str)
{
case 'q':
root=1;
(*str)++;
break;
case 'i':
inverse=1;
(*str)++;
break;
}
i=0;
while (**str<='9' && **str>='0' || **str=='.')
{
numstr[i++]= **str;
(*str)++;
}
(*str)--;
numstr[i]=0;
ret=atof(numstr);
if (root)
ret=sqrt(ret);
if (inverse)
ret = 1/ret;
return ret;
}
static struct lsys_cmd far * _fastcall findsize(struct lsys_cmd far *command, struct lsys_cmd far **rules, int depth)
{
struct lsys_cmd far **rulind;
int tran;
if (overflow) /* integer math routines overflowed */
return NULL;
#ifndef __TURBOC__
if (stackavail() < 400) { /* leave some margin for calling subrtns */
stackoflow = 1;
return NULL;
}
#endif
while (command->ch && command->ch !=']') {
if (! (counter++)) {
/* let user know we're not dead */
if (thinking(1,"L-System thinking (higher orders take longer)")) {
counter--;
return NULL;
}
}
tran=0;
if (depth) {
for(rulind=rules;*rulind;rulind++)
if ((*rulind)->ch==command->ch) {
tran=1;
if (findsize((*rulind)+1,rules,depth-1) == NULL)
return(NULL);
}
}
if (!depth || !tran) {
if (command->f)
(*command->f)(command->n);
else if (command->ch == '[') {
char saveang,saverev;
long savesize,savex,savey;
unsigned long saverang;
saveang=angle;
saverev=reverse;
savesize=size;
saverang=realangle;
savex=xpos;
savey=ypos;
if ((command=findsize(command+1,rules,depth)) == NULL)
return(NULL);
angle=saveang;
reverse=saverev;
size=savesize;
realangle=saverang;
xpos=savex;
ypos=savey;
}
}
command++;
}
return command;
}
static int _fastcall findscale(struct lsys_cmd far *command, struct lsys_cmd far **rules, int depth)
{
float horiz,vert;
double xmin, xmax, ymin, ymax;
double locsize;
double locaspect;
int i;
struct lsys_cmd far *fsret;
locaspect=screenaspect*xdots/ydots;
aspect = FIXEDPT(locaspect);
for(i=0;i<maxangle;i++) {
sins[i]=(long) ((sin(2*i*PI/maxangle)) * FIXEDLT1);
coss[i]=(long) ((locaspect * cos(2*i*PI/maxangle)) * FIXEDLT1);
}
xpos=ypos=lsys_Xmin=lsys_Xmax=lsys_Ymax=lsys_Ymin=angle=reverse=realangle=counter=0;
size=FIXEDPT(1);
fsret = findsize(command,rules,depth);
thinking(0, NULL); /* erase thinking message if any */
xmin = (double) lsys_Xmin / FIXEDMUL;
xmax = (double) lsys_Xmax / FIXEDMUL;
ymin = (double) lsys_Ymin / FIXEDMUL;
ymax = (double) lsys_Ymax / FIXEDMUL;
locsize = (double) size / FIXEDMUL;
if (fsret == NULL)
return 0;
if (xmax == xmin)
horiz = 1E37;
else
horiz = (xdots-10)/(xmax-xmin);
if (ymax == ymin)
vert = 1E37;
else
vert = (ydots-6) /(ymax-ymin);
locsize = (vert<horiz) ? vert : horiz;
if (horiz == 1E37)
xpos = FIXEDPT(xdots/2);
else
xpos = FIXEDPT(-xmin*(locsize)+5+((xdots-10)-(locsize)*(xmax-xmin))/2);
if (vert == 1E37)
ypos = FIXEDPT(ydots/2);
else
ypos = FIXEDPT(-ymin*(locsize)+3+((ydots-6)-(locsize)*(ymax-ymin))/2);
size = FIXEDPT(locsize);
return 1;
}
static struct lsys_cmd far * _fastcall drawLSys(struct lsys_cmd far *command,struct lsys_cmd far **rules,int depth)
{
struct lsys_cmd far **rulind;
int tran;
if (overflow) /* integer math routines overflowed */
return NULL;
#ifndef __TURBOC__
if (stackavail() < 400) { /* leave some margin for calling subrtns */
stackoflow = 1;
return NULL;
}
#endif
while (command->ch && command->ch !=']') {
if (!(counter++)) {
if (check_key()) {
counter--;
return NULL;
}
}
tran=0;
if (depth) {
for(rulind=rules;*rulind;rulind++)
if ((*rulind)->ch == command->ch) {
tran=1;
if (drawLSys((*rulind)+1,rules,depth-1) == NULL)
return NULL;
}
}
if (!depth||!tran) {
if (command->f)
(*command->f)(command->n);
else if (command->ch == '[') {
char saveang,saverev,savecolor;
long savesize,savex,savey;
unsigned long saverang;
saveang=angle;
saverev=reverse;
savesize=size;
saverang=realangle;
savex=xpos;
savey=ypos;
savecolor=curcolor;
if ((command=drawLSys(command+1,rules,depth)) == NULL)
return(NULL);
angle=saveang;
reverse=saverev;
size=savesize;
realangle=saverang;
xpos=savex;
ypos=savey;
curcolor=savecolor;
}
}
command++;
}
return command;
}
#define MAXRULES 27 /* this limits rules to 25 */
static char far *ruleptrs[MAXRULES];
static struct lsys_cmd far *rules2[MAXRULES];
static int _fastcall readLSystemFile(char *str)
{
int c;
char far **rulind;
int err=0;
int linenum,check=0;
char inline[161],fixed[161],*word;
FILE *infile;
char msgbuf[481]; /* enough for 6 full lines */
if (find_file_item(LFileName,str,&infile) < 0)
return -1;
while ((c = fgetc(infile)) != '{')
if (c == EOF) return -1;
maxangle=0;
for(linenum=0;linenum<MAXRULES;++linenum) ruleptrs[linenum]=NULL;
rulind= &ruleptrs[1];
msgbuf[0]=linenum=0;
while(fgets(inline,160,infile)) /* Max line length 160 chars */
{
linenum++;
if ((word = strchr(inline,';'))) /* strip comment */
*word = 0;
strlwr(inline);
if (strspn(inline," \t\n") < strlen(inline)) /* not a blank line */
{
word=strtok(inline," =\t\n");
if (!strcmp(word,"axiom"))
{
save_rule(strtok(NULL," \t\n"),&ruleptrs[0]);
check=1;
}
else if (!strcmp(word,"angle"))
{
maxangle=atoi(strtok(NULL," \t\n"));
dmaxangle = maxangle - 1;
check=1;
}
else if (!strcmp(word,"}"))
break;
else if (strlen(word)==1)
{
char *tok;
tok = strtok(NULL, " \t\n");
strcpy(fixed, word);
if (tok != NULL) { /* Some strcat's die if they cat with NULL */
strcat(fixed, tok);
}
save_rule(fixed, rulind++);
check=1;
}
else
if (err<6)
{
sprintf(&msgbuf[strlen(msgbuf)],
"Syntax error line %d: %s\n",linenum,word);
++err;
}
if (check)
{
check=0;
if(word=strtok(NULL," \t\n"))
if (err<6)
{
sprintf(&msgbuf[strlen(msgbuf)],
"Extra text after command line %d: %s\n",linenum,word);
++err;
}
}
}
}
fclose(infile);
if (!ruleptrs[0] && err<6)
{
strcat(msgbuf,"Error: no axiom\n");
++err;
}
if ((maxangle<3||maxangle>50) && err<6)
{
strcat(msgbuf,"Error: illegal or missing angle\n");
++err;
}
if (err)
{
msgbuf[strlen(msgbuf)-1]=0; /* strip trailing \n */
stopmsg(0,msgbuf);
return -1;
}
*rulind=NULL;
return 0;
}
static char loaded=0;
int Lsystem()
{
int order;
char far **rulesc;
struct lsys_cmd far **sc;
if ( (!loaded) && LLoad())
return -1;
overflow = 0; /* reset integer math overflow flag */
order=param[0];
if (order<=0)
order=0;
stackoflow = 0;
sc = rules2;
for (rulesc = ruleptrs; *rulesc; rulesc++)
*sc++ = SizeTransform(*rulesc);
*sc = NULL;
if (findscale(rules2[0], &rules2[1], order)) {
realangle = angle = reverse = 0;
free_lcmds();
sc = rules2;
for (rulesc = ruleptrs; *rulesc; rulesc++)
*sc++ = DrawTransform(*rulesc);
*sc = NULL;
/* !! HOW ABOUT A BETTER WAY OF PICKING THE DEFAULT DRAWING COLOR */
if ((curcolor=15) > colors) curcolor=colors-1;
drawLSys(rules2[0], &rules2[1], order);
}
if (stackoflow)
{
static char far msg[]={"insufficient memory, try a lower order"};
stopmsg(0,msg);
}
if (overflow) {
static char far msg[]={"Integer math routines failed, try a lower order"};
stopmsg(0,msg);
}
free_rules_mem();
free_lcmds();
loaded=0;
return 0;
}
int LLoad()
{
char i;
if (readLSystemFile(LName)) { /* error occurred */
free_rules_mem();
loaded=0;
return -1;
}
for(i=0;i<maxangle;i++) {
sins[i]=(long) ((sin(2*i*PI/maxangle)) * FIXEDLT1);
coss[i]=(long) (((double) aspect / (double) FIXEDMUL * cos(2*i*PI/maxangle)) * FIXEDLT1);
}
loaded=1;
return 0;
}
static void _fastcall free_rules_mem()
{
int i;
for(i=0;i<MAXRULES;++i)
if(ruleptrs[i]) farmemfree(ruleptrs[i]);
}
static int _fastcall save_rule(char *rule,char far **saveptr)
{
int i;
char far *tmpfar;
i=strlen(rule)+1;
if((tmpfar=farmemalloc((long)i))==NULL) {
stackoflow = 1;
return -1;
}
*saveptr=tmpfar;
while(--i>=0) *(tmpfar++)= *(rule++);
return 0;
}
static struct lsys_cmd far *SizeTransform(char far *s)
{
struct lsys_cmd far *ret;
struct lsys_cmd far *doub;
int maxval = 10;
int n = 0;
void (*f)(long);
long num;
void (*plus)(long) = (ispow2(maxangle)) ? lsys_doplus_pow2 : lsys_doplus;
void (*minus)(long) = (ispow2(maxangle)) ? lsys_dominus_pow2 : lsys_dominus;
void (*pipe)(long) = (ispow2(maxangle)) ? lsys_dopipe_pow2 : lsys_dopipe;
void (*slash)(long) = (cpu == 386) ? lsys_doslash_386 : lsys_doslash;
void (*bslash)(long) = (cpu == 386) ? lsys_dobslash_386 : lsys_dobslash;
void (*at)(long) = (cpu == 386) ? lsys_doat_386 : lsys_doat;
void (*dogf)(long) = (cpu == 386) ? lsys_dosizegf_386 : lsys_dosizegf;
ret = (struct lsys_cmd far *) farmemalloc((long) maxval * sizeof(struct lsys_cmd));
if (ret == NULL) {
stackoflow = 1;
return NULL;
}
while (*s) {
f = NULL;
num = 0;
ret[n].ch = *s;
switch (*s) {
case '+': f = plus; break;
case '-': f = minus; break;
case '/': f = slash; num = (long) (getnumber(&s) * 11930465L); break;
case '\\': f = bslash; num = (long) (getnumber(&s) * 11930465L); break;
case '@': f = at; num = FIXEDPT(getnumber(&s)); break;
case '|': f = pipe; break;
case '!': f = lsys_dobang; break;
case 'd':
case 'm': f = lsys_dosizedm; break;
case 'g':
case 'f': f = dogf; break;
case '[': num = 1; break;
case ']': num = 2; break;
default:
num = 3;
break;
}
ret[n].f = f;
ret[n].n = num;
if (++n == maxval) {
doub = (struct lsys_cmd far *) farmemalloc((long) maxval*2*sizeof(struct lsys_cmd));
if (doub == NULL) {
farmemfree(ret);
stackoflow = 1;
return NULL;
}
far_memcpy(doub, ret, maxval*sizeof(struct lsys_cmd));
farmemfree(ret);
ret = doub;
maxval <<= 1;
}
s++;
}
ret[n].ch = 0;
ret[n].f = NULL;
ret[n].n = 0;
n++;
doub = (struct lsys_cmd far *) farmemalloc((long) n*sizeof(struct lsys_cmd));
if (doub == NULL) {
farmemfree(ret);
stackoflow = 1;
return NULL;
}
far_memcpy(doub, ret, n*sizeof(struct lsys_cmd));
farmemfree(ret);
return doub;
}
static struct lsys_cmd far *DrawTransform(char far *s)
{
struct lsys_cmd far *ret;
struct lsys_cmd far *doub;
int maxval = 10;
int n = 0;
void (*f)(long);
long num;
void (*plus)(long) = (ispow2(maxangle)) ? lsys_doplus_pow2 : lsys_doplus;
void (*minus)(long) = (ispow2(maxangle)) ? lsys_dominus_pow2 : lsys_dominus;
void (*pipe)(long) = (ispow2(maxangle)) ? lsys_dopipe_pow2 : lsys_dopipe;
void (*slash)(long) = (cpu == 386) ? lsys_doslash_386 : lsys_doslash;
void (*bslash)(long) = (cpu == 386) ? lsys_dobslash_386 : lsys_dobslash;
void (*at)(long) = (cpu == 386) ? lsys_doat_386 : lsys_doat;
void (*drawg)(long) = (cpu == 386) ? lsys_dodrawg_386 : lsys_dodrawg;
ret = (struct lsys_cmd far *) farmemalloc((long) maxval * sizeof(struct lsys_cmd));
if (ret == NULL) {
stackoflow = 1;
return NULL;
}
while (*s) {
f = NULL;
num = 0;
ret[n].ch = *s;
switch (*s) {
case '+': f = plus; break;
case '-': f = minus; break;
case '/': f = slash; num = (long) (getnumber(&s) * 11930465L); break;
case '\\': f = bslash; num = (long) (getnumber(&s) * 11930465L); break;
case '@': f = at; num = FIXEDPT(getnumber(&s)); break;
case '|': f = pipe; break;
case '!': f = lsys_dobang; break;
case 'd': f = lsys_dodrawd; break;
case 'm': f = lsys_dodrawm; break;
case 'g': f = drawg; break;
case 'f': f = lsys_dodrawf; break;
case 'c': f = lsys_dodrawc; num = getnumber(&s); break;
case '<': f = lsys_dodrawlt; num = getnumber(&s); break;
case '>': f = lsys_dodrawgt; num = getnumber(&s); break;
case '[': num = 1; break;
case ']': num = 2; break;
default:
num = 3;
break;
}
ret[n].f = f;
ret[n].n = num;
if (++n == maxval) {
doub = (struct lsys_cmd far *) farmemalloc((long) maxval*2*sizeof(struct lsys_cmd));
if (doub == NULL) {
farmemfree(ret);
stackoflow = 1;
return NULL;
}
far_memcpy(doub, ret, maxval*sizeof(struct lsys_cmd));
farmemfree(ret);
ret = doub;
maxval <<= 1;
}
s++;
}
ret[n].ch = 0;
ret[n].f = NULL;
ret[n].n = 0;
n++;
doub = (struct lsys_cmd far *) farmemalloc((long) n*sizeof(struct lsys_cmd));
if (doub == NULL) {
farmemfree(ret);
stackoflow = 1;
return NULL;
}
far_memcpy(doub, ret, n*sizeof(struct lsys_cmd));
farmemfree(ret);
return doub;
}
static void free_lcmds()
{
struct lsys_cmd far **sc = rules2;
while (*sc)
farmemfree(*sc++);
}