ref: e09adf59442cd36888eaea1d76e66ff3259d16b8
dir: /sys/src/cmd/pic/blockgen.c/
#include <stdio.h> #include <stdlib.h> #include "pic.h" #include "y.tab.h" #define NBRACK 20 /* depth of [...] */ #define NBRACE 20 /* depth of {...} */ struct pushstack stack[NBRACK]; int nstack = 0; struct pushstack bracestack[NBRACE]; int nbstack = 0; void blockadj(obj *); obj *leftthing(int c) /* called for {... or [... */ /* really ought to be separate functions */ { obj *p; if (c == '[') { if (nstack >= NBRACK) ERROR "[...] nested too deep" FATAL; stack[nstack].p_x = curx; stack[nstack].p_y = cury; stack[nstack].p_hvmode = hvmode; curx = cury = 0; stack[nstack].p_xmin = xmin; stack[nstack].p_xmax = xmax; stack[nstack].p_ymin = ymin; stack[nstack].p_ymax = ymax; nstack++; xmin = ymin = 30000; xmax = ymax = -30000; p = makenode(BLOCK, 7); p->o_val[4] = nobj; /* 1st item within [...] */ if (p->o_nobj != nobj-1) fprintf(stderr, "nobjs wrong%d %d\n", p->o_nobj, nobj); } else { if (nbstack >= NBRACK) ERROR "{...} nested too deep" FATAL; bracestack[nbstack].p_x = curx; bracestack[nbstack].p_y = cury; bracestack[nbstack].p_hvmode = hvmode; nbstack++; p = NULL; } return(p); } obj *rightthing(obj *p, int c) /* called for ... ] or ... } */ { obj *q; if (c == '}') { nbstack--; curx = bracestack[nbstack].p_x; cury = bracestack[nbstack].p_y; hvmode = bracestack[nbstack].p_hvmode; q = makenode(MOVE, 0); dprintf("M %g %g\n", curx, cury); } else { nstack--; curx = stack[nstack].p_x; cury = stack[nstack].p_y; hvmode = stack[nstack].p_hvmode; q = makenode(BLOCKEND, 7); q->o_val[4] = p->o_nobj + 1; /* back pointer */ p->o_val[5] = q->o_nobj - 1; /* forward pointer */ if (xmin > xmax) /* nothing happened */ xmin = xmax; if (ymin > ymax) ymin = ymax; p->o_val[0] = xmin; p->o_val[1] = ymin; p->o_val[2] = xmax; p->o_val[3] = ymax; p->o_symtab = q->o_symtab = stack[nstack+1].p_symtab; xmin = stack[nstack].p_xmin; ymin = stack[nstack].p_ymin; xmax = stack[nstack].p_xmax; ymax = stack[nstack].p_ymax; } return(q); } obj *blockgen(obj *p, obj *q) /* handles [...] */ { int i, invis, at, with; double ddval, h, w, xwith, ywith; double x0, y0, x1, y1, cx, cy; obj *ppos; Attr *ap; invis = at = 0; with = xwith = ywith = 0; ddval = 0; w = p->o_val[2] - p->o_val[0]; h = p->o_val[3] - p->o_val[1]; cx = (p->o_val[2] + p->o_val[0]) / 2; /* geom ctr of [] wrt local orogin */ cy = (p->o_val[3] + p->o_val[1]) / 2; dprintf("cx,cy=%g,%g\n", cx, cy); for (i = 0; i < nattr; i++) { ap = &attr[i]; switch (ap->a_type) { case HEIGHT: h = ap->a_val.f; break; case WIDTH: w = ap->a_val.f; break; case WITH: with = ap->a_val.i; /* corner */ break; case PLACE: /* actually with position ... */ ppos = ap->a_val.o; xwith = cx - ppos->o_x; ywith = cy - ppos->o_y; with = PLACE; break; case AT: case FROM: ppos = ap->a_val.o; curx = ppos->o_x; cury = ppos->o_y; at++; break; case INVIS: invis = INVIS; break; case TEXTATTR: savetext(ap->a_sub, ap->a_val.p); break; } } if (with) { switch (with) { case NORTH: ywith = -h / 2; break; case SOUTH: ywith = h / 2; break; case EAST: xwith = -w / 2; break; case WEST: xwith = w / 2; break; case NE: xwith = -w / 2; ywith = -h / 2; break; case SE: xwith = -w / 2; ywith = h / 2; break; case NW: xwith = w / 2; ywith = -h / 2; break; case SW: xwith = w / 2; ywith = h / 2; break; } curx += xwith; cury += ywith; } if (!at) { if (isright(hvmode)) curx += w / 2; else if (isleft(hvmode)) curx -= w / 2; else if (isup(hvmode)) cury += h / 2; else cury -= h / 2; } x0 = curx - w / 2; y0 = cury - h / 2; x1 = curx + w / 2; y1 = cury + h / 2; extreme(x0, y0); extreme(x1, y1); p->o_x = curx; p->o_y = cury; p->o_nt1 = ntext1; p->o_nt2 = ntext; ntext1 = ntext; p->o_val[0] = w; p->o_val[1] = h; p->o_val[2] = cx; p->o_val[3] = cy; p->o_val[5] = q->o_nobj - 1; /* last item in [...] */ p->o_ddval = ddval; p->o_attr = invis; dprintf("[] %g %g %g %g at %g %g, h=%g, w=%g\n", x0, y0, x1, y1, curx, cury, h, w); if (isright(hvmode)) curx = x1; else if (isleft(hvmode)) curx = x0; else if (isup(hvmode)) cury = y1; else cury = y0; for (i = 0; i <= 5; i++) q->o_val[i] = p->o_val[i]; stack[nstack+1].p_symtab = NULL; /* so won't be found again */ blockadj(p); /* fix up coords for enclosed blocks */ return(p); } void blockadj(obj *p) /* adjust coords in block starting at p */ { double dx, dy; int n, lev; dx = p->o_x - p->o_val[2]; dy = p->o_y - p->o_val[3]; n = p->o_nobj + 1; dprintf("into blockadj: dx,dy=%g,%g\n", dx, dy); for (lev = 1; lev > 0; n++) { p = objlist[n]; if (p->o_type == BLOCK) lev++; else if (p->o_type == BLOCKEND) lev--; dprintf("blockadj: type=%d o_x,y=%g,%g;", p->o_type, p->o_x, p->o_y); p->o_x += dx; p->o_y += dy; dprintf(" becomes %g,%g\n", p->o_x, p->o_y); switch (p->o_type) { /* other absolute coords */ case LINE: case ARROW: case SPLINE: p->o_val[0] += dx; p->o_val[1] += dy; break; case ARC: p->o_val[0] += dx; p->o_val[1] += dy; p->o_val[2] += dx; p->o_val[3] += dy; break; } } }