/* * * Boundingbox code for PostScript translators. The boundingbox for each page * is accumulated in bbox - the one for the whole document goes in docbbox. A * call to writebbox() puts out an appropriate comment, updates docbbox, and * resets bbox for the next page. The assumption made at the end of writebbox() * is that we're really printing the current page only if output is now going * to stdout - a valid assumption for all supplied translators. Needs the math * library. * */ #include <stdio.h>#include <ctype.h>#include <sys/types.h>#include <fcntl.h>#include <math.h> #include "comments.h"			/* PostScript file structuring comments */#include "gen.h"			/* a few general purpose definitions */#include "ext.h"			/* external variable declarations */ typedef struct bbox {	int	set;	double	llx, lly;	double	urx, ury;} Bbox; Bbox	bbox = {FALSE, 0.0, 0.0, 0.0, 0.0};Bbox	docbbox = {FALSE, 0.0, 0.0, 0.0, 0.0}; double	ctm[6] = {1.0, 0.0, 0.0, 1.0, 0.0, 0.0};double	matrix1[6], matrix2[6]; /*****************************************************************************/ cover(x, y)     double	x, y; { /* * * Adds point (x, y) to bbox. Coordinates are in user space - the transformation * to default coordinates happens in writebbox(). * */     if ( bbox.set == FALSE ) {	bbox.llx = bbox.urx = x;	bbox.lly = bbox.ury = y;	bbox.set = TRUE;    } else {	if ( x < bbox.llx )	    bbox.llx = x;	if ( y < bbox.lly )	    bbox.lly = y;	if ( x > bbox.urx )	    bbox.urx = x;	if ( y > bbox.ury )	    bbox.ury = y;    }	/* End else */ }   /* End of cover */ /*****************************************************************************/ writebbox(fp, keyword, slop)     FILE	*fp;			/* the comment is written here */    char	*keyword;		/* the boundingbox comment string */    int		slop;			/* expand (or contract?) the box a bit */ {     Bbox	ubbox;			/* user space bounding box */    double	x, y; /* * * Transforms the numbers in the bbox[] using ctm[], adjusts the corners a bit * (depending on slop) and then writes comment. If *keyword is BoundingBox use * whatever's been saved in docbbox, otherwise assume the comment is just for * the current page. * */     if ( strcmp(keyword, BOUNDINGBOX) == 0 )	bbox = docbbox;     if ( bbox.set == TRUE ) {	ubbox = bbox;	bbox.set = FALSE;		/* so cover() works properly */	x = ctm[0] * ubbox.llx + ctm[2] * ubbox.lly + ctm[4];	y = ctm[1] * ubbox.llx + ctm[3] * ubbox.lly + ctm[5];	cover(x, y);	x = ctm[0] * ubbox.llx + ctm[2] * ubbox.ury + ctm[4];	y = ctm[1] * ubbox.llx + ctm[3] * ubbox.ury + ctm[5];	cover(x, y);	x = ctm[0] * ubbox.urx + ctm[2] * ubbox.ury + ctm[4];	y = ctm[1] * ubbox.urx + ctm[3] * ubbox.ury + ctm[5];	cover(x, y);	x = ctm[0] * ubbox.urx + ctm[2] * ubbox.lly + ctm[4];	y = ctm[1] * ubbox.urx + ctm[3] * ubbox.lly + ctm[5];	cover(x, y);	bbox.llx -= slop + 0.5;	bbox.lly -= slop + 0.5;	bbox.urx += slop + 0.5;	bbox.ury += slop + 0.5;	fprintf(fp, "%s %d %d %d %d\n", keyword, (int)bbox.llx, (int)bbox.lly,(int)bbox.urx, (int)bbox.ury);	bbox = ubbox;    }	/* End if */     resetbbox((fp == stdout) ? TRUE : FALSE); }   /* End of writebbox */ /*****************************************************************************/ resetbbox(output)     int		output; { /* * * Adds bbox to docbbox and resets bbox for the next page. Only update docbbox * if we really did output on the last page. * */     if ( docbbox.set == TRUE ) {	cover(docbbox.llx, docbbox.lly);	cover(docbbox.urx, docbbox.ury);    }	/* End if */     if ( output == TRUE ) {	docbbox = bbox;	docbbox.set = TRUE;    }	/* End if */     bbox.set = FALSE; }   /* End of resetbbox */ /*****************************************************************************/ scale(sx, sy)     double	sx, sy; { /* * * Scales the default matrix. * */     matrix1[0] = sx;    matrix1[1] = 0;    matrix1[2] = 0;    matrix1[3] = sy;    matrix1[4] = 0;    matrix1[5] = 0;     concat(matrix1); }   /* End of scale */ /*****************************************************************************/ translate(tx, ty)     double	tx, ty; { /* * * Translates the default matrix. * */     matrix1[0] = 1.0;    matrix1[1] = 0.0;    matrix1[2] = 0.0;    matrix1[3] = 1.0;    matrix1[4] = tx;    matrix1[5] = ty;     concat(matrix1); }   /* End of translate */ /*****************************************************************************/ rotate(angle)     double	angle; { /* * * Rotates by angle degrees. * */     angle *= 3.1416 / 180;     matrix1[0] = matrix1[3] = cos(angle);    matrix1[1] = sin(angle);    matrix1[2] = -matrix1[1];    matrix1[4] = 0.0;    matrix1[5] = 0.0;     concat(matrix1); }   /* End of rotate */ /*****************************************************************************/ concat(m1)     double	m1[]; {     double	m2[6]; /* * * Replaces the ctm[] by the result of the matrix multiplication m1[] x ctm[]. * */     m2[0] = ctm[0];    m2[1] = ctm[1];    m2[2] = ctm[2];    m2[3] = ctm[3];    m2[4] = ctm[4];    m2[5] = ctm[5];     ctm[0] = m1[0] * m2[0] + m1[1] * m2[2];    ctm[1] = m1[0] * m2[1] + m1[1] * m2[3];    ctm[2] = m1[2] * m2[0] + m1[3] * m2[2];    ctm[3] = m1[2] * m2[1] + m1[3] * m2[3];    ctm[4] = m1[4] * m2[0] + m1[5] * m2[2] + m2[4];    ctm[5] = m1[4] * m2[1] + m1[5] * m2[3] + m2[5]; }   /* End of concat */ /*****************************************************************************/