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ZOOM.C
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C/C++ Source or Header
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1995-02-19
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24KB
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695 lines
/*
zoom.c - routines for zoombox manipulation and for panning
*/
#include <float.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "fractint.h"
#include "prototyp.h"
#define PIXELROUND 0.00001
static void _fastcall zmo_calc(double, double, double *, double *, double);
static void _fastcall zmo_calcbf(bf_t,bf_t,bf_t,bf_t,bf_t,bf_t,bf_t,bf_t,bf_t);
static int check_pan(void);
static void fix_worklist(void);
static void _fastcall move_row(int fromrow,int torow,int col);
/* big number declarations */
void calc_corner(bf_t target,bf_t p1,double p2,bf_t p3,double p4,bf_t p5)
{
bf_t btmp1, btmp2 ,btmp3;
int saved; saved = save_stack();
btmp1 = alloc_stack(rbflength+2);
btmp2 = alloc_stack(rbflength+2);
btmp3 = alloc_stack(rbflength+2);
/* use target as temporary variable */
floattobf(btmp3, p2);
mult_bf(btmp1,btmp3,p3);
mult_bf(btmp2,floattobf(target, p4),p5);
add_bf(target,btmp1,btmp2);
add_a_bf(target,p1);
restore_stack(saved);
}
void drawbox(int drawit)
{
struct coords tl,bl,tr,br; /* dot addr of topleft, botleft, etc */
double tmpx,tmpy,dx,dy,rotcos,rotsin,ftemp1,ftemp2;
double fxwidth,fxskew,fydepth,fyskew,fxadj;
bf_t bffxwidth, bffxskew, bffydepth, bffyskew, bffxadj;
int saved;
if (zwidth==0) { /* no box to draw */
if (boxcount!=0) { /* remove the old box from display */
clearbox(); /* asm routine */
boxcount = 0; }
reset_zoom_corners();
return; }
if(bf_math)
{
saved = save_stack();
bffxwidth = alloc_stack(rbflength+2);
bffxskew = alloc_stack(rbflength+2);
bffydepth = alloc_stack(rbflength+2);
bffyskew = alloc_stack(rbflength+2);
bffxadj = alloc_stack(rbflength+2);
}
ftemp1 = PI*zrotate/72; /* convert to radians */
rotcos = cos(ftemp1); /* sin & cos of rotation */
rotsin = sin(ftemp1);
/* do some calcs just once here to reduce fp work a bit */
fxwidth = sxmax-sx3rd;
fxskew = sx3rd-sxmin;
fydepth = sy3rd-symax;
fyskew = symin-sy3rd;
fxadj = zwidth*zskew;
if(bf_math)
{
/* do some calcs just once here to reduce fp work a bit */
sub_bf(bffxwidth,bfsxmax,bfsx3rd);
sub_bf(bffxskew,bfsx3rd,bfsxmin);
sub_bf(bffydepth,bfsy3rd,bfsymax);
sub_bf(bffyskew,bfsymin,bfsy3rd);
floattobf(bffxadj, fxadj);
}
/* calc co-ords of topleft & botright corners of box */
tmpx = zwidth/-2+fxadj; /* from zoombox center as origin, on xdots scale */
tmpy = zdepth*finalaspectratio/2;
dx = (rotcos*tmpx - rotsin*tmpy) - tmpx; /* delta x to rotate topleft */
dy = tmpy - (rotsin*tmpx + rotcos*tmpy); /* delta y to rotate topleft */
/* calc co-ords of topleft */
ftemp1 = zbx + dx + fxadj;
ftemp2 = zby + dy/finalaspectratio;
tl.x = (int)(ftemp1*(dxsize+PIXELROUND)); /* screen co-ords */
tl.y = (int)(ftemp2*(dysize+PIXELROUND));
xxmin = sxmin + ftemp1*fxwidth + ftemp2*fxskew; /* real co-ords */
yymax = symax + ftemp2*fydepth + ftemp1*fyskew;
if(bf_math)
{
calc_corner(bfxmin,bfsxmin,ftemp1,bffxwidth,ftemp2,bffxskew);
calc_corner(bfymax,bfsymax,ftemp2,bffydepth,ftemp1,bffyskew);
}
/* calc co-ords of bottom right */
ftemp1 = zbx + zwidth - dx - fxadj;
ftemp2 = zby - dy/finalaspectratio + zdepth;
br.x = (int)(ftemp1*(dxsize+PIXELROUND));
br.y = (int)(ftemp2*(dysize+PIXELROUND));
xxmax = sxmin + ftemp1*fxwidth + ftemp2*fxskew;
yymin = symax + ftemp2*fydepth + ftemp1*fyskew;
if(bf_math)
{
calc_corner(bfxmax,bfsxmin,ftemp1,bffxwidth,ftemp2,bffxskew);
calc_corner(bfymin,bfsymax,ftemp2,bffydepth,ftemp1,bffyskew);
}
/* do the same for botleft & topright */
tmpx = zwidth/-2 - fxadj;
tmpy = 0.0-tmpy;
dx = (rotcos*tmpx - rotsin*tmpy) - tmpx;
dy = tmpy - (rotsin*tmpx + rotcos*tmpy);
ftemp1 = zbx + dx - fxadj;
ftemp2 = zby + dy/finalaspectratio + zdepth;
bl.x = (int)(ftemp1*(dxsize+PIXELROUND));
bl.y = (int)(ftemp2*(dysize+PIXELROUND));
xx3rd = sxmin + ftemp1*fxwidth + ftemp2*fxskew;
yy3rd = symax + ftemp2*fydepth + ftemp1*fyskew;
if(bf_math)
{
calc_corner(bfx3rd,bfsxmin,ftemp1,bffxwidth,ftemp2,bffxskew);
calc_corner(bfy3rd,bfsymax,ftemp2,bffydepth,ftemp1,bffyskew);
restore_stack(saved);
}
ftemp1 = zbx + zwidth - dx + fxadj;
ftemp2 = zby - dy/finalaspectratio;
tr.x = (int)(ftemp1*(dxsize+PIXELROUND));
tr.y = (int)(ftemp2*(dysize+PIXELROUND));
if (boxcount!=0) { /* remove the old box from display */
clearbox(); /* asm routine */
boxcount = 0; }
if (drawit) { /* caller wants box drawn as well as co-ords calc'd */
#ifndef XFRACT
/* build the list of zoom box pixels */
addbox(tl); addbox(tr); /* corner pixels */
addbox(bl); addbox(br);
drawlines(tl,tr,bl.x-tl.x,bl.y-tl.y); /* top & bottom lines */
drawlines(tl,bl,tr.x-tl.x,tr.y-tl.y); /* left & right lines */
#else
boxx[0] = tl.x + sxoffs;
boxy[0] = tl.y + syoffs;
boxx[1] = tr.x + sxoffs;
boxy[1] = tr.y + syoffs;
boxx[2] = br.x + sxoffs;
boxy[2] = br.y + syoffs;
boxx[3] = bl.x + sxoffs;
boxy[3] = bl.y + syoffs;
boxcount = 1;
#endif
dispbox(); /* asm routine to paint it */
}
}
void _fastcall drawlines(struct coords fr, struct coords to,
int dx, int dy)
{ int xincr,yincr,ctr;
int altctr,altdec,altinc;
struct coords tmpp,line1,line2;
if (abs(to.x-fr.x) > abs(to.y-fr.y)) { /* delta.x > delta.y */
if (fr.x>to.x) { /* swap so from.x is < to.x */
tmpp = fr; fr = to; to = tmpp; }
xincr = (to.x-fr.x)*4/sxdots+1; /* do every 1st, 2nd, 3rd, or 4th dot */
ctr = (to.x-fr.x-1)/xincr;
altdec = abs(to.y-fr.y)*xincr;
altinc = to.x-fr.x;
altctr = altinc/2;
yincr = (to.y>fr.y)?1:-1;
line2.x = (line1.x = fr.x) + dx;
line2.y = (line1.y = fr.y) + dy;
while (--ctr>=0) {
line1.x += xincr;
line2.x += xincr;
altctr -= altdec;
while (altctr<0) {
altctr += altinc;
line1.y += yincr;
line2.y += yincr;
}
addbox(line1);
addbox(line2);
}
}
else { /* delta.y > delta.x */
if (fr.y>to.y) { /* swap so from.y is < to.y */
tmpp = fr; fr = to; to = tmpp; }
yincr = (to.y-fr.y)*4/sydots+1; /* do every 1st, 2nd, 3rd, or 4th dot */
ctr = (to.y-fr.y-1)/yincr;
altdec = abs(to.x-fr.x)*yincr;
altinc = to.y-fr.y;
altctr = altinc/2;
xincr = (to.x>fr.x) ? 1 : -1;
line2.x = (line1.x = fr.x) + dx;
line2.y = (line1.y = fr.y) + dy;
while (--ctr>=0) {
line1.y += yincr;
line2.y += yincr;
altctr -= altdec;
while (altctr<0) {
altctr += altinc;
line1.x += xincr;
line2.x += xincr;
}
addbox(line1);
addbox(line2);
}
}
}
void _fastcall addbox(struct coords point)
{
point.x += sxoffs;
point.y += syoffs;
if (point.x >= 0 && point.x < sxdots && point.y >= 0 && point.y < sydots) {
boxx[boxcount] = point.x;
boxy[boxcount] = point.y;
++boxcount;
}
}
void moveboxf(double dx, double dy)
{ int align,row,col;
align = check_pan();
if (dx!=0.0) {
if ((zbx += dx) + zwidth/2 < 0) /* center must stay onscreen */
zbx = zwidth/-2;
if (zbx + zwidth/2 > 1)
zbx = 1.0 - zwidth/2;
if (align != 0
&& ((col = (int)(zbx*(dxsize+PIXELROUND))) & (align-1)) != 0) {
if (dx > 0) col += align;
col -= col & (align-1); /* adjust col to pass alignment */
zbx = (double)col/dxsize; }
}
if (dy!=0.0) {
if ((zby += dy) + zdepth/2 < 0)
zby = zdepth/-2;
if (zby + zdepth/2 > 1)
zby = 1.0 - zdepth/2;
if (align != 0
&& ((row = (int)(zby*(dysize+PIXELROUND))) & (align-1)) != 0) {
if (dy > 0) row += align;
row -= row & (align-1);
zby = (double)row/dysize; }
}
}
static void _fastcall chgboxf(double dwidth, double ddepth)
{
if (zwidth+dwidth > 1)
dwidth = 1.0-zwidth;
if (zwidth+dwidth < 0.05)
dwidth = 0.05-zwidth;
zwidth += dwidth;
if (zdepth+ddepth > 1)
ddepth = 1.0-zdepth;
if (zdepth+ddepth < 0.05)
ddepth = 0.05-zdepth;
zdepth += ddepth;
moveboxf(dwidth/-2,ddepth/-2); /* keep it centered & check limits */
}
void resizebox(int steps)
{
double deltax,deltay;
if (zdepth*screenaspect > zwidth) { /* box larger on y axis */
deltay = steps * 0.036 / screenaspect;
deltax = zwidth * deltay / zdepth;
}
else { /* box larger on x axis */
deltax = steps * 0.036;
deltay = zdepth * deltax / zwidth;
}
chgboxf(deltax,deltay);
}
void chgboxi(int dw, int dd)
{ /* change size by pixels */
chgboxf( (double)dw/dxsize, (double)dd/dysize );
}
#ifdef C6
#pragma optimize("e",off) /* MSC 6.00A messes up next rtn with "e" on */
#endif
extern void show_three_bf();
static void _fastcall zmo_calcbf(bf_t bfdx, bf_t bfdy,
bf_t bfnewx, bf_t bfnewy,bf_t bfplotmx1, bf_t bfplotmx2, bf_t bfplotmy1,
bf_t bfplotmy2, bf_t bfftemp)
{
bf_t btmp1, btmp2, btmp3, btmp4, btempx, btempy ;
bf_t btmp2a, btmp4a;
int saved; saved = save_stack();
btmp1 = alloc_stack(rbflength+2);
btmp2 = alloc_stack(rbflength+2);
btmp3 = alloc_stack(rbflength+2);
btmp4 = alloc_stack(rbflength+2);
btmp2a = alloc_stack(rbflength+2);
btmp4a = alloc_stack(rbflength+2);
btempx = alloc_stack(rbflength+2);
btempy = alloc_stack(rbflength+2);
/* calc cur screen corner relative to zoombox, when zoombox co-ords
are taken as (0,0) topleft thru (1,1) bottom right */
/* tempx = dy * plotmx1 - dx * plotmx2; */
mult_bf(btmp1,bfdy,bfplotmx1);
mult_bf(btmp2,bfdx,bfplotmx2);
sub_bf(btempx,btmp1,btmp2);
/* tempy = dx * plotmy1 - dy * plotmy2; */
mult_bf(btmp1,bfdx,bfplotmy1);
mult_bf(btmp2,bfdy,bfplotmy2);
sub_bf(btempy,btmp1,btmp2);
/* calc new corner by extending from current screen corners */
/* *newx = sxmin + tempx*(sxmax-sx3rd)/ftemp + tempy*(sx3rd-sxmin)/ftemp; */
sub_bf(btmp1,bfsxmax,bfsx3rd);
mult_bf(btmp2,btempx,btmp1);
/* show_three_bf("fact1",btempx,"fact2",btmp1,"prod ",btmp2,70); */
div_bf(btmp2a,btmp2,bfftemp);
/* show_three_bf("num ",btmp2,"denom",bfftemp,"quot ",btmp2a,70); */
sub_bf(btmp3,bfsx3rd,bfsxmin);
mult_bf(btmp4,btempy,btmp3);
div_bf(btmp4a,btmp4,bfftemp);
add_bf(bfnewx,bfsxmin,btmp2a);
add_a_bf(bfnewx,btmp4a);
/* *newy = symax + tempy*(sy3rd-symax)/ftemp + tempx*(symin-sy3rd)/ftemp; */
sub_bf(btmp1,bfsy3rd,bfsymax);
mult_bf(btmp2,btempy,btmp1);
div_bf(btmp2a,btmp2,bfftemp);
sub_bf(btmp3,bfsymin,bfsy3rd);
mult_bf(btmp4,btempx,btmp3);
div_bf(btmp4a,btmp4,bfftemp);
add_bf(bfnewy,bfsymax,btmp2a);
add_a_bf(bfnewy,btmp4a);
restore_stack(saved);
}
static void _fastcall zmo_calc(double dx, double dy, double *newx, double *newy, double ftemp)
{
double tempx,tempy;
/* calc cur screen corner relative to zoombox, when zoombox co-ords
are taken as (0,0) topleft thru (1,1) bottom right */
tempx = dy * plotmx1 - dx * plotmx2;
tempy = dx * plotmy1 - dy * plotmy2;
/* calc new corner by extending from current screen corners */
*newx = sxmin + tempx*(sxmax-sx3rd)/ftemp + tempy*(sx3rd-sxmin)/ftemp;
*newy = symax + tempy*(sy3rd-symax)/ftemp + tempx*(symin-sy3rd)/ftemp;
}
void zoomoutbf(void) /* for ctl-enter, calc corners for zooming out */
{
/* (xxmin,yymax), etc, are already set to zoombox corners;
(sxmin,symax), etc, are still the screen's corners;
use the same logic as plot_orbit stuff to first calculate current screen
corners relative to the zoombox, as if the zoombox were a square with
upper left (0,0) and width/depth 1; ie calc the current screen corners
as if plotting them from the zoombox;
then extend these co-ords from current real screen corners to get
new actual corners
*/
bf_t savbfxmin,savbfymax,bfftemp;
bf_t tmp1, tmp2, tmp3, tmp4, tmp5, tmp6,bfplotmx1,bfplotmx2,bfplotmy1,bfplotmy2;
int saved;
saved = save_stack();
savbfxmin = alloc_stack(rbflength+2);
savbfymax = alloc_stack(rbflength+2);
bfftemp = alloc_stack(rbflength+2);
tmp1 = alloc_stack(rbflength+2);
tmp2 = alloc_stack(rbflength+2);
tmp3 = alloc_stack(rbflength+2);
tmp4 = alloc_stack(rbflength+2);
tmp5 = alloc_stack(rbflength+2);
tmp6 = alloc_stack(rbflength+2);
bfplotmx1 = alloc_stack(rbflength+2);
bfplotmx2 = alloc_stack(rbflength+2);
bfplotmy1 = alloc_stack(rbflength+2);
bfplotmy2 = alloc_stack(rbflength+2);
/* ftemp = (yymin-yy3rd)*(xx3rd-xxmin) - (xxmax-xx3rd)*(yy3rd-yymax); */
sub_bf(tmp1,bfymin,bfy3rd);
sub_bf(tmp2,bfx3rd,bfxmin);
sub_bf(tmp3,bfxmax,bfx3rd);
sub_bf(tmp4,bfy3rd,bfymax);
mult_bf(tmp5,tmp1,tmp2);
mult_bf(tmp6,tmp3,tmp4);
sub_bf(bfftemp,tmp5,tmp6);
/* plotmx1 = (xx3rd-xxmin); */ ; /* reuse the plotxxx vars is safe */
copy_bf(bfplotmx1,tmp2);
/* plotmx2 = (yy3rd-yymax); */
copy_bf(bfplotmx2,tmp4);
/* plotmy1 = (yymin-yy3rd); */
copy_bf(bfplotmy1,tmp1);
/* plotmy2 = (xxmax-xx3rd); */;
copy_bf(bfplotmy2,tmp3);
/* savxxmin = xxmin; savyymax = yymax; */
copy_bf(savbfxmin,bfxmin); copy_bf(savbfymax,bfymax);
sub_bf(tmp1,bfsxmin,savbfxmin); sub_bf(tmp2,bfsymax,savbfymax);
zmo_calcbf(tmp1,tmp2,bfxmin,bfymax,bfplotmx1,bfplotmx2,bfplotmy1,
bfplotmy2,bfftemp);
sub_bf(tmp1,bfsxmax,savbfxmin); sub_bf(tmp2,bfsymin,savbfymax);
zmo_calcbf(tmp1,tmp2,bfxmax,bfymin,bfplotmx1,bfplotmx2,bfplotmy1,
bfplotmy2,bfftemp);
sub_bf(tmp1,bfsx3rd,savbfxmin); sub_bf(tmp2,bfsy3rd,savbfymax);
zmo_calcbf(tmp1,tmp2,bfx3rd,bfy3rd,bfplotmx1,bfplotmx2,bfplotmy1,
bfplotmy2,bfftemp);
restore_stack(saved);
}
void zoomoutdbl(void) /* for ctl-enter, calc corners for zooming out */
{
/* (xxmin,yymax), etc, are already set to zoombox corners;
(sxmin,symax), etc, are still the screen's corners;
use the same logic as plot_orbit stuff to first calculate current screen
corners relative to the zoombox, as if the zoombox were a square with
upper left (0,0) and width/depth 1; ie calc the current screen corners
as if plotting them from the zoombox;
then extend these co-ords from current real screen corners to get
new actual corners
*/
double savxxmin,savyymax,ftemp;
ftemp = (yymin-yy3rd)*(xx3rd-xxmin) - (xxmax-xx3rd)*(yy3rd-yymax);
plotmx1 = (xx3rd-xxmin); /* reuse the plotxxx vars is safe */
plotmx2 = (yy3rd-yymax);
plotmy1 = (yymin-yy3rd);
plotmy2 = (xxmax-xx3rd);
savxxmin = xxmin; savyymax = yymax;
zmo_calc(sxmin-savxxmin,symax-savyymax,&xxmin,&yymax,ftemp);
zmo_calc(sxmax-savxxmin,symin-savyymax,&xxmax,&yymin,ftemp);
zmo_calc(sx3rd-savxxmin,sy3rd-savyymax,&xx3rd,&yy3rd,ftemp);
}
void zoomout(void) /* for ctl-enter, calc corners for zooming out */
{
if(bf_math)
{
zoomoutbf();
}
else
zoomoutdbl();
}
#ifdef C6
#pragma optimize("e",on) /* back to normal */
#endif
void aspectratio_crop(float oldaspect,float newaspect)
{
double ftemp,xmargin,ymargin;
if (newaspect > oldaspect) { /* new ratio is taller, crop x */
ftemp = (1.0 - oldaspect / newaspect) / 2;
xmargin = (xxmax - xx3rd) * ftemp;
ymargin = (yymin - yy3rd) * ftemp;
xx3rd += xmargin;
yy3rd += ymargin;
}
else { /* new ratio is wider, crop y */
ftemp = (1.0 - newaspect / oldaspect) / 2;
xmargin = (xx3rd - xxmin) * ftemp;
ymargin = (yy3rd - yymax) * ftemp;
xx3rd -= xmargin;
yy3rd -= ymargin;
}
xxmin += xmargin;
yymax += ymargin;
xxmax -= xmargin;
yymin -= ymargin;
}
static int check_pan(void) /* return 0 if can't, alignment requirement if can */
{ int i,j;
if (calc_status != 2 && calc_status != 4)
return(0); /* not resumable, not complete */
if ( curfractalspecific->calctype != StandardFractal
&& curfractalspecific->calctype != calcmand
&& curfractalspecific->calctype != calcmandfp
&& curfractalspecific->calctype != lyapunov
&& curfractalspecific->calctype != calcfroth)
return(0); /* not a worklist-driven type */
if (zwidth != 1.0 || zdepth != 1.0 || zskew != 0.0 || zrotate != 0.0)
return(0); /* not a full size unrotated unskewed zoombox */
/* can pan if we get this far */
if (calc_status == 4)
return(1); /* image completed, align on any pixel */
if (potflag && pot16bit)
return(1); /* 1 pass forced so align on any pixel */
if (stdcalcmode == 'b')
return(1); /* btm, align on any pixel */
if (stdcalcmode == 't')
return(0); /* tesselate, can't do it */
if (stdcalcmode != 'g' || (curfractalspecific->flags&NOGUESS)) {
if (stdcalcmode == '2' || stdcalcmode == '3') /* align on even pixel for 2pass */
return(2);
return(1); /* assume 1pass */
}
/* solid guessing */
start_resume();
get_resume(sizeof(int),&num_worklist,sizeof(worklist),worklist,0);
/* don't do end_resume! we're just looking */
i = 9;
for (j=0; j<num_worklist; ++j) /* find lowest pass in any pending window */
if (worklist[j].pass < i)
i = worklist[j].pass;
j = ssg_blocksize(); /* worst-case alignment requirement */
while (--i >= 0)
j = j>>1; /* reduce requirement */
return(j);
}
static void _fastcall move_row(int fromrow,int torow,int col)
/* move a row on the screen */
{ int startcol,endcol,tocol;
memset(dstack,0,xdots); /* use dstack as a temp for the row; clear it */
if (fromrow >= 0 && fromrow < ydots) {
tocol = startcol = 0;
endcol = xdots-1;
if (col < 0) {
tocol -= col;
endcol += col; }
if (col > 0)
startcol += col;
get_line(fromrow,startcol,endcol,(BYTE *)&dstack[tocol]);
}
put_line(torow,0,xdots-1,(BYTE *)dstack);
}
int init_pan_or_recalc(int do_zoomout) /* decide to recalc, or to chg worklist & pan */
{ int i,j,row,col,y,alignmask,listfull;
if (zwidth == 0.0)
return(0); /* no zoombox, leave calc_status as is */
/* got a zoombox */
if ((alignmask=check_pan()-1) < 0) {
calc_status = 0; /* can't pan, trigger recalc */
return(0); }
if (zbx == 0.0 && zby == 0.0) {
clearbox();
return(0); } /* box is full screen, leave calc_status as is */
col = (int)(zbx*(dxsize+PIXELROUND)); /* calc dest col,row of topleft pixel */
row = (int)(zby*(dysize+PIXELROUND));
if (do_zoomout) { /* invert row and col */
row = 0-row;
col = 0-col; }
if ((row&alignmask) != 0 || (col&alignmask) != 0) {
calc_status = 0; /* not on useable pixel alignment, trigger recalc */
return(0); }
/* pan */
num_worklist = 0;
if (calc_status == 2) {
start_resume();
get_resume(sizeof(int),&num_worklist,sizeof(worklist),worklist,0);
} /* don't do end_resume! we might still change our mind */
/* adjust existing worklist entries */
for (i=0; i<num_worklist; ++i) {
worklist[i].yystart -= row;
worklist[i].yystop -= row;
worklist[i].yybegin -= row;
worklist[i].xxstart -= col;
worklist[i].xxstop -= col;
}
/* add worklist entries for the new edges */
listfull = i = 0;
j = ydots-1;
if (row < 0) {
listfull |= add_worklist(0,xdots-1,0,0-row-1,0,0,0);
i = 0 - row; }
if (row > 0) {
listfull |= add_worklist(0,xdots-1,ydots-row,ydots-1,ydots-row,0,0);
j = ydots - row - 1; }
if (col < 0)
listfull |= add_worklist(0,0-col-1,i,j,i,0,0);
if (col > 0)
listfull |= add_worklist(xdots-col,xdots-1,i,j,i,0,0);
if (listfull != 0) {
static FCODE msg[] = {"\
Tables full, can't pan current image.\n\
Cancel resumes old image, continue pans and calculates a new one."};
if (stopmsg(2,msg)) {
zwidth = 0; /* cancel the zoombox */
drawbox(1); }
else
calc_status = 0; /* trigger recalc */
return(0); }
/* now we're committed */
calc_status = 2;
clearbox();
if (row > 0) /* move image up */
for (y=0; y<ydots; ++y) move_row(y+row,y,col);
else /* move image down */
for (y=ydots; --y>=0;) move_row(y+row,y,col);
fix_worklist(); /* fixup any out of bounds worklist entries */
alloc_resume(sizeof(worklist)+10,1); /* post the new worklist */
put_resume(sizeof(int),&num_worklist,sizeof(worklist),worklist,0);
return(0);
}
static void _fastcall restart_window(int wknum)
/* force a worklist entry to restart */
{ int yfrom,yto,xfrom,xto;
if ((yfrom = worklist[wknum].yystart) < 0) yfrom = 0;
if ((xfrom = worklist[wknum].xxstart) < 0) xfrom = 0;
if ((yto = worklist[wknum].yystop) >= ydots) yto = ydots - 1;
if ((xto = worklist[wknum].xxstop) >= xdots) xto = xdots - 1;
memset(dstack,0,xdots); /* use dstack as a temp for the row; clear it */
while (yfrom <= yto)
put_line(yfrom++,xfrom,xto,(BYTE *)dstack);
worklist[wknum].sym = worklist[wknum].pass = 0;
worklist[wknum].yybegin = worklist[wknum].yystart;
}
static void fix_worklist(void) /* fix out of bounds and symmetry related stuff */
{ int i,j,k;
WORKLIST *wk;
for (i=0; i<num_worklist; ++i) {
wk = &worklist[i];
if ( wk->yystart >= ydots || wk->yystop < 0
|| wk->xxstart >= xdots || wk->xxstop < 0) { /* offscreen, delete */
for (j=i+1; j<num_worklist; ++j)
worklist[j-1] = worklist[j];
--num_worklist;
--i;
continue; }
if (wk->yystart < 0) /* partly off top edge */
if ((wk->sym&1) == 0) /* no sym, easy */
wk->yystart = 0;
else { /* xaxis symmetry */
if ((j = wk->yystop + wk->yystart) > 0
&& num_worklist < MAXCALCWORK) { /* split the sym part */
worklist[num_worklist] = worklist[i];
worklist[num_worklist].yystart = 0;
worklist[num_worklist++].yystop = j;
wk->yystart = j+1; }
else
wk->yystart = 0;
restart_window(i); /* restart the no-longer sym part */
}
if (wk->yystop >= ydots) { /* partly off bottom edge */
j = ydots-1;
if ((wk->sym&1) != 0) { /* uses xaxis symmetry */
if ((k = wk->yystart + (wk->yystop - j)) < j)
if (num_worklist >= MAXCALCWORK) /* no room to split */
restart_window(i);
else { /* split it */
worklist[num_worklist] = worklist[i];
worklist[num_worklist].yystart = k;
worklist[num_worklist++].yystop = j;
j = k-1; }
wk->sym &= -1 - 1; }
wk->yystop = j; }
if (wk->xxstart < 0) /* partly off left edge */
if ((wk->sym&2) == 0) /* no sym, easy */
wk->xxstart = 0;
else { /* yaxis symmetry */
if ((j = wk->xxstop + wk->xxstart) > 0
&& num_worklist < MAXCALCWORK) { /* split the sym part */
worklist[num_worklist] = worklist[i];
worklist[num_worklist].xxstart = 0;
worklist[num_worklist++].xxstop = j;
wk->xxstart = j+1; }
else
wk->xxstart = 0;
restart_window(i); /* restart the no-longer sym part */
}
if (wk->xxstop >= xdots) { /* partly off right edge */
j = xdots-1;
if ((wk->sym&2) != 0) { /* uses xaxis symmetry */
if ((k = wk->xxstart + (wk->xxstop - j)) < j)
if (num_worklist >= MAXCALCWORK) /* no room to split */
restart_window(i);
else { /* split it */
worklist[num_worklist] = worklist[i];
worklist[num_worklist].xxstart = k;
worklist[num_worklist++].xxstop = j;
j = k-1; }
wk->sym &= -1 - 2; }
wk->xxstop = j; }
if (wk->yybegin < wk->yystart) wk->yybegin = wk->yystart;
if (wk->yybegin > wk->yystop) wk->yybegin = wk->yystop;
}
tidy_worklist(); /* combine where possible, re-sort */
}