| 453 |
|
combine(void) /* combine pictures */ |
| 454 |
|
{ |
| 455 |
|
EPNODE *coldef[3], *brtdef; |
| 456 |
+ |
int set_x, set_y; |
| 457 |
|
COLOR *scanout; |
| 458 |
|
double d; |
| 459 |
|
int i, j; |
| 468 |
|
brtdef = eparse(vbrtout); |
| 469 |
|
else |
| 470 |
|
brtdef = NULL; |
| 471 |
+ |
/* what to set */ |
| 472 |
+ |
set_x = varlookup(vxpos) != NULL && !vardefined(vxpos); |
| 473 |
+ |
set_y = varlookup(vypos) != NULL && !vardefined(vypos); |
| 474 |
|
/* allocate scanline */ |
| 475 |
|
scanout = (COLOR *)emalloc(xres*sizeof(COLOR)); |
| 476 |
|
/* set input position */ |
| 478 |
|
/* combine files */ |
| 479 |
|
for (ypos = yres-1; ypos >= 0; ypos--) { |
| 480 |
|
advance(); |
| 481 |
< |
varset(vypos, '=', (double)ypos); |
| 481 |
> |
if (set_y) varset(vypos, '=', (double)ypos); |
| 482 |
|
for (xpos = 0; xpos < xres; xpos++) { |
| 483 |
|
xscan = (xpos+.5)*xmax/xres; |
| 484 |
< |
varset(vxpos, '=', (double)xpos); |
| 484 |
> |
if (set_x) varset(vxpos, '=', (double)xpos); |
| 485 |
|
eclock++; |
| 486 |
|
if (brtdef != NULL) { |
| 487 |
|
d = evalue(brtdef); |
