path: root/generic/tkCanvPs.c

/* 
 * tkCanvPs.c --
 *
 *	This module provides Postscript output support for canvases,
 *	including the "postscript" widget command plus a few utility
 *	procedures used for generating Postscript.
 *
 * Copyright (c) 1991-1994 The Regents of the University of California.
 * Copyright (c) 1994-1996 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tkCanvPs.c,v 1.3 1998/09/14 18:23:05 stanton Exp $
 */

#include "tkInt.h"
#include "tkCanvas.h"
#include "tkPort.h"

/*
 * See tkCanvas.h for key data structures used to implement canvases.
 */

/*
 * One of the following structures is created to keep track of Postscript
 * output being generated.  It consists mostly of information provided on
 * the widget command line.
 */

typedef struct TkPostscriptInfo {
    int x, y, width, height;	/* Area to print, in canvas pixel
				 * coordinates. */
    int x2, y2;			/* x+width and y+height. */
    char *pageXString;		/* String value of "-pagex" option or NULL. */
    char *pageYString;		/* String value of "-pagey" option or NULL. */
    double pageX, pageY;	/* Postscript coordinates (in points)
				 * corresponding to pageXString and
				 * pageYString. Don't forget that y-values
				 * grow upwards for Postscript! */
    char *pageWidthString;	/* Printed width of output. */
    char *pageHeightString;	/* Printed height of output. */
    double scale;		/* Scale factor for conversion: each pixel
				 * maps into this many points. */
    Tk_Anchor pageAnchor;	/* How to anchor bbox on Postscript page. */
    int rotate;			/* Non-zero means output should be rotated
				 * on page (landscape mode). */
    char *fontVar;		/* If non-NULL, gives name of global variable
				 * containing font mapping information.
				 * Malloc'ed. */
    char *colorVar;		/* If non-NULL, give name of global variable
				 * containing color mapping information.
				 * Malloc'ed. */
    char *colorMode;		/* Mode for handling colors:  "monochrome",
				 * "gray", or "color".  Malloc'ed. */
    int colorLevel;		/* Numeric value corresponding to colorMode:
				 * 0 for mono, 1 for gray, 2 for color. */
    char *fileName;		/* Name of file in which to write Postscript;
				 * NULL means return Postscript info as
				 * result. Malloc'ed. */
    char *channelName;		/* If -channel is specified, the name of
                                 * the channel to use. */
    Tcl_Channel chan;		/* Open channel corresponding to fileName. */
    Tcl_HashTable fontTable;	/* Hash table containing names of all font
				 * families used in output.  The hash table
				 * values are not used. */
    int prepass;		/* Non-zero means that we're currently in
				 * the pre-pass that collects font information,
				 * so the Postscript generated isn't
				 * relevant. */
} TkPostscriptInfo;

/*
 * The table below provides a template that's used to process arguments
 * to the canvas "postscript" command and fill in TkPostscriptInfo
 * structures.
 */

static Tk_ConfigSpec configSpecs[] = {
    {TK_CONFIG_STRING, "-colormap", (char *) NULL, (char *) NULL,
	"", Tk_Offset(TkPostscriptInfo, colorVar), 0},
    {TK_CONFIG_STRING, "-colormode", (char *) NULL, (char *) NULL,
	"", Tk_Offset(TkPostscriptInfo, colorMode), 0},
    {TK_CONFIG_STRING, "-file", (char *) NULL, (char *) NULL,
	"", Tk_Offset(TkPostscriptInfo, fileName), 0},
    {TK_CONFIG_STRING, "-channel", (char *) NULL, (char *) NULL,
	"", Tk_Offset(TkPostscriptInfo, channelName), 0},
    {TK_CONFIG_STRING, "-fontmap", (char *) NULL, (char *) NULL,
	"", Tk_Offset(TkPostscriptInfo, fontVar), 0},
    {TK_CONFIG_PIXELS, "-height", (char *) NULL, (char *) NULL,
	"", Tk_Offset(TkPostscriptInfo, height), 0},
    {TK_CONFIG_ANCHOR, "-pageanchor", (char *) NULL, (char *) NULL,
	"", Tk_Offset(TkPostscriptInfo, pageAnchor), 0},
    {TK_CONFIG_STRING, "-pageheight", (char *) NULL, (char *) NULL,
	"", Tk_Offset(TkPostscriptInfo, pageHeightString), 0},
    {TK_CONFIG_STRING, "-pagewidth", (char *) NULL, (char *) NULL,
	"", Tk_Offset(TkPostscriptInfo, pageWidthString), 0},
    {TK_CONFIG_STRING, "-pagex", (char *) NULL, (char *) NULL,
	"", Tk_Offset(TkPostscriptInfo, pageXString), 0},
    {TK_CONFIG_STRING, "-pagey", (char *) NULL, (char *) NULL,
	"", Tk_Offset(TkPostscriptInfo, pageYString), 0},
    {TK_CONFIG_BOOLEAN, "-rotate", (char *) NULL, (char *) NULL,
	"", Tk_Offset(TkPostscriptInfo, rotate), 0},
    {TK_CONFIG_PIXELS, "-width", (char *) NULL, (char *) NULL,
	"", Tk_Offset(TkPostscriptInfo, width), 0},
    {TK_CONFIG_PIXELS, "-x", (char *) NULL, (char *) NULL,
	"", Tk_Offset(TkPostscriptInfo, x), 0},
    {TK_CONFIG_PIXELS, "-y", (char *) NULL, (char *) NULL,
	"", Tk_Offset(TkPostscriptInfo, y), 0},
    {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
	(char *) NULL, 0, 0}
};

/*
 * The prolog data. Generated by str2c from prolog.ps
 * This was split in small chunks by str2c because
 * some C compiler have limitations on the size of static strings.
 */
static CONST char * CONST  prolog[]= {
	/* Start of part 1 (2000 characters) */
	"%%BeginProlog\n\
50 dict begin\n\
\n\
% This is a standard prolog for Postscript generated by Tk's canvas\n\
% widget.\n\
% RCS: @(#) $Id: tkCanvPs.c,v 1.3 1998/09/14 18:23:05 stanton Exp $
\n\
% The definitions below just define all of the variables used in\n\
% any of the procedures here.  This is needed for obscure reasons\n\
% explained on p. 716 of the Postscript manual (Section H.2.7,\n\
% \"Initializing Variables,\" in the section on Encapsulated Postscript).\n\
\n\
/baseline 0 def\n\
/stipimage 0 def\n\
/height 0 def\n\
/justify 0 def\n\
/lineLength 0 def\n\
/spacing 0 def\n\
/stipple 0 def\n\
/strings 0 def\n\
/xoffset 0 def\n\
/yoffset 0 def\n\
/tmpstip null def\n\
\n\
% Define the array ISOLatin1Encoding (which specifies how characters are\n\
% encoded for ISO-8859-1 fonts), if it isn't already present (Postscript\n\
% level 2 is supposed to define it, but level 1 doesn't).\n\
\n\
systemdict /ISOLatin1Encoding known not {\n\
    /ISOLatin1Encoding [\n\
	/space /space /space /space /space /space /space /space\n\
	/space /space /space /space /space /space /space /space\n\
	/space /space /space /space /space /space /space /space\n\
	/space /space /space /space /space /space /space /space\n\
	/space /exclam /quotedbl /numbersign /dollar /percent /ampersand\n\
	    /quoteright\n\
	/parenleft /parenright /asterisk /plus /comma /minus /period /slash\n\
	/zero /one /two /three /four /five /six /seven\n\
	/eight /nine /colon /semicolon /less /equal /greater /question\n\
	/at /A /B /C /D /E /F /G\n\
	/H /I /J /K /L /M /N /O\n\
	/P /Q /R /S /T /U /V /W\n\
	/X /Y /Z /bracketleft /backslash /bracketright /asciicircum /underscore\n\
	/quoteleft /a /b /c /d /e /f /g\n\
	/h /i /j /k /l /m /n /o\n\
	/p /q /r /s /t /u /v /w\n\
	/x /y /z /braceleft /bar /braceright /asciitilde /space\n\
	/space /space /space /space /space /space /space /space\n\
	/space /space /space /space /space /space /space /space\n\
	/dotlessi /grave /acute /circumflex /tilde /macron /breve /dotaccent\n\
	/dieresis /space /ring /cedilla /space /hungarumlaut /ogonek /caron\n\
	/space /exclamdown /cent /sterling /currency /yen /brokenbar /section\n\
	/dieresis /copyright /ordfem",
	/* End of part 1 */

	/* Start of part 2 (2000 characters) */
	"inine /guillemotleft /logicalnot /hyphen\n\
	    /registered /macron\n\
	/degree /plusminus /twosuperior /threesuperior /acute /mu /paragraph\n\
	    /periodcentered\n\
	/cedillar /onesuperior /ordmasculine /guillemotright /onequarter\n\
	    /onehalf /threequarters /questiondown\n\
	/Agrave /Aacute /Acircumflex /Atilde /Adieresis /Aring /AE /Ccedilla\n\
	/Egrave /Eacute /Ecircumflex /Edieresis /Igrave /Iacute /Icircumflex\n\
	    /Idieresis\n\
	/Eth /Ntilde /Ograve /Oacute /Ocircumflex /Otilde /Odieresis /multiply\n\
	/Oslash /Ugrave /Uacute /Ucircumflex /Udieresis /Yacute /Thorn\n\
	    /germandbls\n\
	/agrave /aacute /acircumflex /atilde /adieresis /aring /ae /ccedilla\n\
	/egrave /eacute /ecircumflex /edieresis /igrave /iacute /icircumflex\n\
	    /idieresis\n\
	/eth /ntilde /ograve /oacute /ocircumflex /otilde /odieresis /divide\n\
	/oslash /ugrave /uacute /ucircumflex /udieresis /yacute /thorn\n\
	    /ydieresis\n\
    ] def\n\
} if\n\
\n\
% font ISOEncode font\n\
% This procedure changes the encoding of a font from the default\n\
% Postscript encoding to ISOLatin1.  It's typically invoked just\n\
% before invoking \"setfont\".  The body of this procedure comes from\n\
% Section 5.6.1 of the Postscript book.\n\
\n\
/ISOEncode {\n\
    dup length dict begin\n\
	{1 index /FID ne {def} {pop pop} ifelse} forall\n\
	/Encoding ISOLatin1Encoding def\n\
	currentdict\n\
    end\n\
\n\
    % I'm not sure why it's necessary to use \"definefont\" on this new\n\
    % font, but it seems to be important; just use the name \"Temporary\"\n\
    % for the font.\n\
\n\
    /Temporary exch definefont\n\
} bind def\n\
\n\
% StrokeClip\n\
%\n\
% This procedure converts the current path into a clip area under\n\
% the assumption of stroking.  It's a bit tricky because some Postscript\n\
% interpreters get errors during strokepath for dashed lines.  If\n\
% this happens then turn off dashes and try again.\n\
\n\
/StrokeClip {\n\
    {strokepath} stopped {\n\
	(This Postscript printer gets limitcheck overflows when) =\n\
	(stippling dashed lines;  lines will be printed solid instead.) =\n\
	[] 0 setdash strokepath} if\n\
    clip\n\
} bind def\n\
\n\
% d",
	/* End of part 2 */

	/* Start of part 3 (2000 characters) */
	"esiredSize EvenPixels closestSize\n\
%\n\
% The procedure below is used for stippling.  Given the optimal size\n\
% of a dot in a stipple pattern in the current user coordinate system,\n\
% compute the closest size that is an exact multiple of the device's\n\
% pixel size.  This allows stipple patterns to be displayed without\n\
% aliasing effects.\n\
\n\
/EvenPixels {\n\
    % Compute exact number of device pixels per stipple dot.\n\
    dup 0 matrix currentmatrix dtransform\n\
    dup mul exch dup mul add sqrt\n\
\n\
    % Round to an integer, make sure the number is at least 1, and compute\n\
    % user coord distance corresponding to this.\n\
    dup round dup 1 lt {pop 1} if\n\
    exch div mul\n\
} bind def\n\
\n\
% width height string StippleFill --\n\
%\n\
% Given a path already set up and a clipping region generated from\n\
% it, this procedure will fill the clipping region with a stipple\n\
% pattern.  \"String\" contains a proper image description of the\n\
% stipple pattern and \"width\" and \"height\" give its dimensions.  Each\n\
% stipple dot is assumed to be about one unit across in the current\n\
% user coordinate system.  This procedure trashes the graphics state.\n\
\n\
/StippleFill {\n\
    % The following code is needed to work around a NeWSprint bug.\n\
\n\
    /tmpstip 1 index def\n\
\n\
    % Change the scaling so that one user unit in user coordinates\n\
    % corresponds to the size of one stipple dot.\n\
    1 EvenPixels dup scale\n\
\n\
    % Compute the bounding box occupied by the path (which is now\n\
    % the clipping region), and round the lower coordinates down\n\
    % to the nearest starting point for the stipple pattern.  Be\n\
    % careful about negative numbers, since the rounding works\n\
    % differently on them.\n\
\n\
    pathbbox\n\
    4 2 roll\n\
    5 index div dup 0 lt {1 sub} if cvi 5 index mul 4 1 roll\n\
    6 index div dup 0 lt {1 sub} if cvi 6 index mul 3 2 roll\n\
\n\
    % Stack now: width height string y1 y2 x1 x2\n\
    % Below is a doubly-nested for loop to iterate across this area\n\
    % in units of the stipple pattern size, going up columns then\n\
    % acr",
	/* End of part 3 */

	/* Start of part 4 (2000 characters) */
	"oss rows, blasting out a stipple-pattern-sized rectangle at\n\
    % each position\n\
\n\
    6 index exch {\n\
	2 index 5 index 3 index {\n\
	    % Stack now: width height string y1 y2 x y\n\
\n\
	    gsave\n\
	    1 index exch translate\n\
	    5 index 5 index true matrix tmpstip imagemask\n\
	    grestore\n\
	} for\n\
	pop\n\
    } for\n\
    pop pop pop pop pop\n\
} bind def\n\
\n\
% -- AdjustColor --\n\
% Given a color value already set for output by the caller, adjusts\n\
% that value to a grayscale or mono value if requested by the CL\n\
% variable.\n\
\n\
/AdjustColor {\n\
    CL 2 lt {\n\
	currentgray\n\
	CL 0 eq {\n\
	    .5 lt {0} {1} ifelse\n\
	} if\n\
	setgray\n\
    } if\n\
} bind def\n\
\n\
% x y strings spacing xoffset yoffset justify stipple DrawText --\n\
% This procedure does all of the real work of drawing text.  The\n\
% color and font must already have been set by the caller, and the\n\
% following arguments must be on the stack:\n\
%\n\
% x, y -	Coordinates at which to draw text.\n\
% strings -	An array of strings, one for each line of the text item,\n\
%		in order from top to bottom.\n\
% spacing -	Spacing between lines.\n\
% xoffset -	Horizontal offset for text bbox relative to x and y: 0 for\n\
%		nw/w/sw anchor, -0.5 for n/center/s, and -1.0 for ne/e/se.\n\
% yoffset -	Vertical offset for text bbox relative to x and y: 0 for\n\
%		nw/n/ne anchor, +0.5 for w/center/e, and +1.0 for sw/s/se.\n\
% justify -	0 for left justification, 0.5 for center, 1 for right justify.\n\
% stipple -	Boolean value indicating whether or not text is to be\n\
%		drawn in stippled fashion.  If text is stippled,\n\
%		procedure StippleText must have been defined to call\n\
%		StippleFill in the right way.\n\
%\n\
% Also, when this procedure is invoked, the color and font must already\n\
% have been set for the text.\n\
\n\
/DrawText {\n\
    /stipple exch def\n\
    /justify exch def\n\
    /yoffset exch def\n\
    /xoffset exch def\n\
    /spacing exch def\n\
    /strings exch def\n\
\n\
    % First scan through all of the text to find the widest line.\n\
\n\
    /lineLength 0 def\n\
    strings {\n\
	stringwidth pop\n\
	dup lineLength gt {/lineLength exch def}",
	/* End of part 4 */

	/* Start of part 5 (1546 characters) */
	" {pop} ifelse\n\
	newpath\n\
    } forall\n\
\n\
    % Compute the baseline offset and the actual font height.\n\
\n\
    0 0 moveto (TXygqPZ) false charpath\n\
    pathbbox dup /baseline exch def\n\
    exch pop exch sub /height exch def pop\n\
    newpath\n\
\n\
    % Translate coordinates first so that the origin is at the upper-left\n\
    % corner of the text's bounding box. Remember that x and y for\n\
    % positioning are still on the stack.\n\
\n\
    translate\n\
    lineLength xoffset mul\n\
    strings length 1 sub spacing mul height add yoffset mul translate\n\
\n\
    % Now use the baseline and justification information to translate so\n\
    % that the origin is at the baseline and positioning point for the\n\
    % first line of text.\n\
\n\
    justify lineLength mul baseline neg translate\n\
\n\
    % Iterate over each of the lines to output it.  For each line,\n\
    % compute its width again so it can be properly justified, then\n\
    % display it.\n\
\n\
    strings {\n\
	dup stringwidth pop\n\
	justify neg mul 0 moveto\n\
	stipple {\n\
\n\
	    % The text is stippled, so turn it into a path and print\n\
	    % by calling StippledText, which in turn calls StippleFill.\n\
	    % Unfortunately, many Postscript interpreters will get\n\
	    % overflow errors if we try to do the whole string at\n\
	    % once, so do it a character at a time.\n\
\n\
	    gsave\n\
	    /char (X) def\n\
	    {\n\
		char 0 3 -1 roll put\n\
		currentpoint\n\
		gsave\n\
		char true charpath clip StippleText\n\
		grestore\n\
		char stringwidth translate\n\
		moveto\n\
	    } forall\n\
	    grestore\n\
	} {show} ifelse\n\
	0 spacing neg translate\n\
    } forall\n\
} bind def\n\
\n\
%%EndProlog\n\
",
	/* End of part 5 */

	NULL	/* End of data marker */
};

/*
 * Forward declarations for procedures defined later in this file:
 */

static int		GetPostscriptPoints _ANSI_ARGS_((Tcl_Interp *interp,
			    char *string, double *doublePtr));

/*
 *--------------------------------------------------------------
 *
 * TkCanvPostscriptCmd --
 *
 *	This procedure is invoked to process the "postscript" options
 *	of the widget command for canvas widgets. See the user
 *	documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *--------------------------------------------------------------
 */

    /* ARGSUSED */
int
TkCanvPostscriptCmd(canvasPtr, interp, argc, argv)
    TkCanvas *canvasPtr;		/* Information about canvas widget. */
    Tcl_Interp *interp;			/* Current interpreter. */
    int argc;				/* Number of arguments. */
    char **argv;			/* Argument strings.  Caller has
					 * already parsed this command enough
					 * to know that argv[1] is
					 * "postscript". */
{
    TkPostscriptInfo psInfo, *oldInfoPtr;
    int result;
    Tk_Item *itemPtr;
#define STRING_LENGTH 400
    char string[STRING_LENGTH+1], *p;
    time_t now;
    size_t length;
    int deltaX = 0, deltaY = 0;		/* Offset of lower-left corner of
					 * area to be marked up, measured
					 * in canvas units from the positioning
					 * point on the page (reflects
					 * anchor position).  Initial values
					 * needed only to stop compiler
					 * warnings. */
    Tcl_HashSearch search;
    Tcl_HashEntry *hPtr;
    Tcl_DString buffer;
    CONST char * CONST *chunk;

    /*
     *----------------------------------------------------------------
     * Initialize the data structure describing Postscript generation,
     * then process all the arguments to fill the data structure in.
     *----------------------------------------------------------------
     */

    oldInfoPtr = canvasPtr->psInfoPtr;
    canvasPtr->psInfoPtr = &psInfo;
    psInfo.x = canvasPtr->xOrigin;
    psInfo.y = canvasPtr->yOrigin;
    psInfo.width = -1;
    psInfo.height = -1;
    psInfo.pageXString = NULL;
    psInfo.pageYString = NULL;
    psInfo.pageX = 72*4.25;
    psInfo.pageY = 72*5.5;
    psInfo.pageWidthString = NULL;
    psInfo.pageHeightString = NULL;
    psInfo.scale = 1.0;
    psInfo.pageAnchor = TK_ANCHOR_CENTER;
    psInfo.rotate = 0;
    psInfo.fontVar = NULL;
    psInfo.colorVar = NULL;
    psInfo.colorMode = NULL;
    psInfo.colorLevel = 0;
    psInfo.fileName = NULL;
    psInfo.channelName = NULL;
    psInfo.chan = NULL;
    psInfo.prepass = 0;
    Tcl_InitHashTable(&psInfo.fontTable, TCL_STRING_KEYS);
    result = Tk_ConfigureWidget(canvasPtr->interp, canvasPtr->tkwin,
	    configSpecs, argc-2, argv+2, (char *) &psInfo,
	    TK_CONFIG_ARGV_ONLY);
    if (result != TCL_OK) {
	goto cleanup;
    }

    if (psInfo.width == -1) {
	psInfo.width = Tk_Width(canvasPtr->tkwin);
    }
    if (psInfo.height == -1) {
	psInfo.height = Tk_Height(canvasPtr->tkwin);
    }
    psInfo.x2 = psInfo.x + psInfo.width;
    psInfo.y2 = psInfo.y + psInfo.height;

    if (psInfo.pageXString != NULL) {
	if (GetPostscriptPoints(canvasPtr->interp, psInfo.pageXString,
		&psInfo.pageX) != TCL_OK) {
	    goto cleanup;
	}
    }
    if (psInfo.pageYString != NULL) {
	if (GetPostscriptPoints(canvasPtr->interp, psInfo.pageYString,
		&psInfo.pageY) != TCL_OK) {
	    goto cleanup;
	}
    }
    if (psInfo.pageWidthString != NULL) {
	if (GetPostscriptPoints(canvasPtr->interp, psInfo.pageWidthString,
		&psInfo.scale) != TCL_OK) {
	    goto cleanup;
	}
	psInfo.scale /= psInfo.width;
    } else if (psInfo.pageHeightString != NULL) {
	if (GetPostscriptPoints(canvasPtr->interp, psInfo.pageHeightString,
		&psInfo.scale) != TCL_OK) {
	    goto cleanup;
	}
	psInfo.scale /= psInfo.height;
    } else {
	psInfo.scale = (72.0/25.4)*WidthMMOfScreen(Tk_Screen(canvasPtr->tkwin));
	psInfo.scale /= WidthOfScreen(Tk_Screen(canvasPtr->tkwin));
    }
    switch (psInfo.pageAnchor) {
	case TK_ANCHOR_NW:
	case TK_ANCHOR_W:
	case TK_ANCHOR_SW:
	    deltaX = 0;
	    break;
	case TK_ANCHOR_N:
	case TK_ANCHOR_CENTER:
	case TK_ANCHOR_S:
	    deltaX = -psInfo.width/2;
	    break;
	case TK_ANCHOR_NE:
	case TK_ANCHOR_E:
	case TK_ANCHOR_SE:
	    deltaX = -psInfo.width;
	    break;
    }
    switch (psInfo.pageAnchor) {
	case TK_ANCHOR_NW:
	case TK_ANCHOR_N:
	case TK_ANCHOR_NE:
	    deltaY = - psInfo.height;
	    break;
	case TK_ANCHOR_W:
	case TK_ANCHOR_CENTER:
	case TK_ANCHOR_E:
	    deltaY = -psInfo.height/2;
	    break;
	case TK_ANCHOR_SW:
	case TK_ANCHOR_S:
	case TK_ANCHOR_SE:
	    deltaY = 0;
	    break;
    }

    if (psInfo.colorMode == NULL) {
	psInfo.colorLevel = 2;
    } else {
	length = strlen(psInfo.colorMode);
	if (strncmp(psInfo.colorMode, "monochrome", length) == 0) {
	    psInfo.colorLevel = 0;
	} else if (strncmp(psInfo.colorMode, "gray", length) == 0) {
	    psInfo.colorLevel = 1;
	} else if (strncmp(psInfo.colorMode, "color", length) == 0) {
	    psInfo.colorLevel = 2;
	} else {
	    Tcl_AppendResult(canvasPtr->interp, "bad color mode \"",
		    psInfo.colorMode, "\": must be monochrome, ",
		    "gray, or color", (char *) NULL);
	    goto cleanup;
	}
    }

    if (psInfo.fileName != NULL) {

        /*
         * Check that -file and -channel are not both specified.
         */

        if (psInfo.channelName != NULL) {
            Tcl_AppendResult(canvasPtr->interp, "can't specify both -file",
                    " and -channel", (char *) NULL);
            result = TCL_ERROR;
            goto cleanup;
        }

        /*
         * Check that we are not in a safe interpreter. If we are, disallow
         * the -file specification.
         */

        if (Tcl_IsSafe(canvasPtr->interp)) {
            Tcl_AppendResult(canvasPtr->interp, "can't specify -file in a",
                    " safe interpreter", (char *) NULL);
            result = TCL_ERROR;
            goto cleanup;
        }
        
	p = Tcl_TranslateFileName(canvasPtr->interp, psInfo.fileName, &buffer);
	if (p == NULL) {
	    goto cleanup;
	}
	psInfo.chan = Tcl_OpenFileChannel(canvasPtr->interp, p, "w", 0666);
	Tcl_DStringFree(&buffer);
	if (psInfo.chan == NULL) {
	    goto cleanup;
	}
    }

    if (psInfo.channelName != NULL) {
        int mode;
        
        /*
         * Check that the channel is found in this interpreter and that it
         * is open for writing.
         */

        psInfo.chan = Tcl_GetChannel(canvasPtr->interp, psInfo.channelName,
                &mode);
        if (psInfo.chan == (Tcl_Channel) NULL) {
            result = TCL_ERROR;
            goto cleanup;
        }
        if ((mode & TCL_WRITABLE) == 0) {
            Tcl_AppendResult(canvasPtr->interp, "channel \"",
                    psInfo.channelName, "\" wasn't opened for writing",
                    (char *) NULL);
            result = TCL_ERROR;
            goto cleanup;
        }
    }
    
    /*
     *--------------------------------------------------------
     * Make a pre-pass over all of the items, generating Postscript
     * and then throwing it away.  The purpose of this pass is just
     * to collect information about all the fonts in use, so that
     * we can output font information in the proper form required
     * by the Document Structuring Conventions.
     *--------------------------------------------------------
     */

    psInfo.prepass = 1;
    for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
	    itemPtr = itemPtr->nextPtr) {
	if ((itemPtr->x1 >= psInfo.x2) || (itemPtr->x2 < psInfo.x)
		|| (itemPtr->y1 >= psInfo.y2) || (itemPtr->y2 < psInfo.y)) {
	    continue;
	}
	if (itemPtr->typePtr->postscriptProc == NULL) {
	    continue;
	}
	result = (*itemPtr->typePtr->postscriptProc)(canvasPtr->interp,
		(Tk_Canvas) canvasPtr, itemPtr, 1);
	Tcl_ResetResult(canvasPtr->interp);
	if (result != TCL_OK) {
	    /*
	     * An error just occurred.  Just skip out of this loop.
	     * There's no need to report the error now;  it can be
	     * reported later (errors can happen later that don't
	     * happen now, so we still have to check for errors later
	     * anyway).
	     */
	    break;
	}
    }
    psInfo.prepass = 0;

    /*
     *--------------------------------------------------------
     * Generate the header and prolog for the Postscript.
     *--------------------------------------------------------
     */

    Tcl_AppendResult(canvasPtr->interp, "%!PS-Adobe-3.0 EPSF-3.0\n",
	    "%%Creator: Tk Canvas Widget\n", (char *) NULL);
#if !(defined(__WIN32__) || defined(MAC_TCL))
    if (!Tcl_IsSafe(interp)) {
	struct passwd *pwPtr = getpwuid(getuid());
	Tcl_AppendResult(canvasPtr->interp, "%%For: ",
		(pwPtr != NULL) ? pwPtr->pw_gecos : "Unknown", "\n",
		(char *) NULL);
	endpwent();
    }
#endif /* __WIN32__ || MAC_TCL */
    Tcl_AppendResult(canvasPtr->interp, "%%Title: Window ",
	    Tk_PathName(canvasPtr->tkwin), "\n", (char *) NULL);
    time(&now);
    Tcl_AppendResult(canvasPtr->interp, "%%CreationDate: ",
	    ctime(&now), (char *) NULL);
    if (!psInfo.rotate) {
	sprintf(string, "%d %d %d %d",
		(int) (psInfo.pageX + psInfo.scale*deltaX),
		(int) (psInfo.pageY + psInfo.scale*deltaY),
		(int) (psInfo.pageX + psInfo.scale*(deltaX + psInfo.width)
			+ 1.0),
		(int) (psInfo.pageY + psInfo.scale*(deltaY + psInfo.height)
			+ 1.0));
    } else {
	sprintf(string, "%d %d %d %d",
		(int) (psInfo.pageX - psInfo.scale*(deltaY + psInfo.height)),
		(int) (psInfo.pageY + psInfo.scale*deltaX),
		(int) (psInfo.pageX - psInfo.scale*deltaY + 1.0),
		(int) (psInfo.pageY + psInfo.scale*(deltaX + psInfo.width)
			+ 1.0));
    }
    Tcl_AppendResult(canvasPtr->interp, "%%BoundingBox: ", string,
	    "\n", (char *) NULL);
    Tcl_AppendResult(canvasPtr->interp, "%%Pages: 1\n", 
	    "%%DocumentData: Clean7Bit\n", (char *) NULL);
    Tcl_AppendResult(canvasPtr->interp, "%%Orientation: ",
	    psInfo.rotate ? "Landscape\n" : "Portrait\n", (char *) NULL);
    p = "%%DocumentNeededResources: font ";
    for (hPtr = Tcl_FirstHashEntry(&psInfo.fontTable, &search);
	    hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
	Tcl_AppendResult(canvasPtr->interp, p,
		Tcl_GetHashKey(&psInfo.fontTable, hPtr),
		"\n", (char *) NULL);
	p = "%%+ font ";
    }
    Tcl_AppendResult(canvasPtr->interp, "%%EndComments\n\n", (char *) NULL);

    /*
     * Insert the prolog
     */
    for (chunk=prolog; *chunk; chunk++) {
	Tcl_AppendResult(interp, *chunk, (char *) NULL);
    }

    if (psInfo.chan != NULL) {
	Tcl_Write(psInfo.chan, canvasPtr->interp->result, -1);
	Tcl_ResetResult(canvasPtr->interp);
    }

    /*
     *-----------------------------------------------------------
     * Document setup:  set the color level and include fonts.
     *-----------------------------------------------------------
     */

    sprintf(string, "/CL %d def\n", psInfo.colorLevel);
    Tcl_AppendResult(canvasPtr->interp, "%%BeginSetup\n", string,
	    (char *) NULL);
    for (hPtr = Tcl_FirstHashEntry(&psInfo.fontTable, &search);
	    hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
	Tcl_AppendResult(canvasPtr->interp, "%%IncludeResource: font ",
		Tcl_GetHashKey(&psInfo.fontTable, hPtr), "\n", (char *) NULL);
    }
    Tcl_AppendResult(canvasPtr->interp, "%%EndSetup\n\n", (char *) NULL);

    /*
     *-----------------------------------------------------------
     * Page setup:  move to page positioning point, rotate if
     * needed, set scale factor, offset for proper anchor position,
     * and set clip region.
     *-----------------------------------------------------------
     */

    Tcl_AppendResult(canvasPtr->interp, "%%Page: 1 1\n", "save\n",
	    (char *) NULL);
    sprintf(string, "%.1f %.1f translate\n", psInfo.pageX, psInfo.pageY);
    Tcl_AppendResult(canvasPtr->interp, string, (char *) NULL);
    if (psInfo.rotate) {
	Tcl_AppendResult(canvasPtr->interp, "90 rotate\n", (char *) NULL);
    }
    sprintf(string, "%.4g %.4g scale\n", psInfo.scale, psInfo.scale);
    Tcl_AppendResult(canvasPtr->interp, string, (char *) NULL);
    sprintf(string, "%d %d translate\n", deltaX - psInfo.x, deltaY);
    Tcl_AppendResult(canvasPtr->interp, string, (char *) NULL);
    sprintf(string, "%d %.15g moveto %d %.15g lineto %d %.15g lineto %d %.15g",
	    psInfo.x, Tk_CanvasPsY((Tk_Canvas) canvasPtr, (double) psInfo.y),
	    psInfo.x2, Tk_CanvasPsY((Tk_Canvas) canvasPtr, (double) psInfo.y),
	    psInfo.x2, Tk_CanvasPsY((Tk_Canvas) canvasPtr, (double) psInfo.y2),
	    psInfo.x, Tk_CanvasPsY((Tk_Canvas) canvasPtr, (double) psInfo.y2));
    Tcl_AppendResult(canvasPtr->interp, string,
	" lineto closepath clip newpath\n", (char *) NULL);
    if (psInfo.chan != NULL) {
	Tcl_Write(psInfo.chan, canvasPtr->interp->result, -1);
	Tcl_ResetResult(canvasPtr->interp);
    }

    /*
     *---------------------------------------------------------------------
     * Iterate through all the items, having each relevant one draw itself.
     * Quit if any of the items returns an error.
     *---------------------------------------------------------------------
     */

    result = TCL_OK;
    for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
	    itemPtr = itemPtr->nextPtr) {
	if ((itemPtr->x1 >= psInfo.x2) || (itemPtr->x2 < psInfo.x)
		|| (itemPtr->y1 >= psInfo.y2) || (itemPtr->y2 < psInfo.y)) {
	    continue;
	}
	if (itemPtr->typePtr->postscriptProc == NULL) {
	    continue;
	}
	Tcl_AppendResult(canvasPtr->interp, "gsave\n", (char *) NULL);
	result = (*itemPtr->typePtr->postscriptProc)(canvasPtr->interp,
		(Tk_Canvas) canvasPtr, itemPtr, 0);
	if (result != TCL_OK) {
	    char msg[100];

	    sprintf(msg, "\n    (generating Postscript for item %d)",
		    itemPtr->id);
	    Tcl_AddErrorInfo(canvasPtr->interp, msg);
	    goto cleanup;
	}
	Tcl_AppendResult(canvasPtr->interp, "grestore\n", (char *) NULL);
	if (psInfo.chan != NULL) {
	    Tcl_Write(psInfo.chan, canvasPtr->interp->result, -1);
	    Tcl_ResetResult(canvasPtr->interp);
	}
    }

    /*
     *---------------------------------------------------------------------
     * Output page-end information, such as commands to print the page
     * and document trailer stuff.
     *---------------------------------------------------------------------
     */

    Tcl_AppendResult(canvasPtr->interp, "restore showpage\n\n",
	    "%%Trailer\nend\n%%EOF\n", (char *) NULL);
    if (psInfo.chan != NULL) {
	Tcl_Write(psInfo.chan, canvasPtr->interp->result, -1);
	Tcl_ResetResult(canvasPtr->interp);
    }

    /*
     * Clean up psInfo to release malloc'ed stuff.
     */

    cleanup:
    if (psInfo.pageXString != NULL) {
	ckfree(psInfo.pageXString);
    }
    if (psInfo.pageYString != NULL) {
	ckfree(psInfo.pageYString);
    }
    if (psInfo.pageWidthString != NULL) {
	ckfree(psInfo.pageWidthString);
    }
    if (psInfo.pageHeightString != NULL) {
	ckfree(psInfo.pageHeightString);
    }
    if (psInfo.fontVar != NULL) {
	ckfree(psInfo.fontVar);
    }
    if (psInfo.colorVar != NULL) {
	ckfree(psInfo.colorVar);
    }
    if (psInfo.colorMode != NULL) {
	ckfree(psInfo.colorMode);
    }
    if (psInfo.fileName != NULL) {
	ckfree(psInfo.fileName);
    }
    if ((psInfo.chan != NULL) && (psInfo.channelName == NULL)) {
	Tcl_Close(canvasPtr->interp, psInfo.chan);
    }
    if (psInfo.channelName != NULL) {
        ckfree(psInfo.channelName);
    }
    Tcl_DeleteHashTable(&psInfo.fontTable);
    canvasPtr->psInfoPtr = oldInfoPtr;
    return result;
}

/*
 *--------------------------------------------------------------
 *
 * Tk_CanvasPsColor --
 *
 *	This procedure is called by individual canvas items when
 *	they want to set a color value for output.  Given information
 *	about an X color, this procedure will generate Postscript
 *	commands to set up an appropriate color in Postscript.
 *
 * Results:
 *	Returns a standard Tcl return value.  If an error occurs
 *	then an error message will be left in interp->result.
 *	If no error occurs, then additional Postscript will be
 *	appended to interp->result.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

int
Tk_CanvasPsColor(interp, canvas, colorPtr)
    Tcl_Interp *interp;			/* Interpreter for returning Postscript
					 * or error message. */
    Tk_Canvas canvas;			/* Information about canvas. */
    XColor *colorPtr;			/* Information about color. */
{
    TkCanvas *canvasPtr = (TkCanvas *) canvas;
    TkPostscriptInfo *psInfoPtr = canvasPtr->psInfoPtr;
    int tmp;
    double red, green, blue;
    char string[200];

    if (psInfoPtr->prepass) {
	return TCL_OK;
    }

    /*
     * If there is a color map defined, then look up the color's name
     * in the map and use the Postscript commands found there, if there
     * are any.
     */

    if (psInfoPtr->colorVar != NULL) {
	char *cmdString;

	cmdString = Tcl_GetVar2(interp, psInfoPtr->colorVar,
		Tk_NameOfColor(colorPtr), 0);
	if (cmdString != NULL) {
	    Tcl_AppendResult(interp, cmdString, "\n", (char *) NULL);
	    return TCL_OK;
	}
    }

    /*
     * No color map entry for this color.  Grab the color's intensities
     * and output Postscript commands for them.  Special note:  X uses
     * a range of 0-65535 for intensities, but most displays only use
     * a range of 0-255, which maps to (0, 256, 512, ... 65280) in the
     * X scale.  This means that there's no way to get perfect white,
     * since the highest intensity is only 65280 out of 65535.  To
     * work around this problem, rescale the X intensity to a 0-255
     * scale and use that as the basis for the Postscript colors.  This
     * scheme still won't work if the display only uses 4 bits per color,
     * but most diplays use at least 8 bits.
     */

    tmp = colorPtr->red;
    red = ((double) (tmp >> 8))/255.0;
    tmp = colorPtr->green;
    green = ((double) (tmp >> 8))/255.0;
    tmp = colorPtr->blue;
    blue = ((double) (tmp >> 8))/255.0;
    sprintf(string, "%.3f %.3f %.3f setrgbcolor AdjustColor\n",
	    red, green, blue);
    Tcl_AppendResult(interp, string, (char *) NULL);
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * Tk_CanvasPsFont --
 *
 *	This procedure is called by individual canvas items when
 *	they want to output text.  Given information about an X
 *	font, this procedure will generate Postscript commands
 *	to set up an appropriate font in Postscript.
 *
 * Results:
 *	Returns a standard Tcl return value.  If an error occurs
 *	then an error message will be left in interp->result.
 *	If no error occurs, then additional Postscript will be
 *	appended to the interp->result.
 *
 * Side effects:
 *	The Postscript font name is entered into psInfoPtr->fontTable
 *	if it wasn't already there.
 *
 *--------------------------------------------------------------
 */

int
Tk_CanvasPsFont(interp, canvas, tkfont)
    Tcl_Interp *interp;			/* Interpreter for returning Postscript
					 * or error message. */
    Tk_Canvas canvas;			/* Information about canvas. */
    Tk_Font tkfont;			/* Information about font in which text
					 * is to be printed. */
{
    TkCanvas *canvasPtr = (TkCanvas *) canvas;
    TkPostscriptInfo *psInfoPtr = canvasPtr->psInfoPtr;
    char *end;
    char pointString[20];
    Tcl_DString ds;
    int i, points;

    /*
     * First, look up the font's name in the font map, if there is one.
     * If there is an entry for this font, it consists of a list
     * containing font name and size.  Use this information.
     */

    Tcl_DStringInit(&ds);
    
    if (psInfoPtr->fontVar != NULL) {
	char *list, **argv;
	int argc;
	double size;
	char *name;

	name = Tk_NameOfFont(tkfont);
	list = Tcl_GetVar2(interp, psInfoPtr->fontVar, name, 0);
	if (list != NULL) {
	    if (Tcl_SplitList(interp, list, &argc, &argv) != TCL_OK) {
		badMapEntry:
		Tcl_ResetResult(interp);
		Tcl_AppendResult(interp, "bad font map entry for \"", name,
			"\": \"", list, "\"", (char *) NULL);
		return TCL_ERROR;
	    }
	    if (argc != 2) {
		goto badMapEntry;
	    }
	    size = strtod(argv[1], &end);
	    if ((size <= 0) || (*end != 0)) {
		goto badMapEntry;
	    }

	    Tcl_DStringAppend(&ds, argv[0], -1);
	    points = (int) size;
	    
	    ckfree((char *) argv);
	    goto findfont;
	}
    } 

    points = Tk_PostscriptFontName(tkfont, &ds);

    findfont:
    sprintf(pointString, "%d", points);
    Tcl_AppendResult(interp, "/", Tcl_DStringValue(&ds), " findfont ",
	    pointString, " scalefont ", (char *) NULL);
    if (strncasecmp(Tcl_DStringValue(&ds), "Symbol", 7) != 0) {
	Tcl_AppendResult(interp, "ISOEncode ", (char *) NULL);
    }
    Tcl_AppendResult(interp, "setfont\n", (char *) NULL);
    Tcl_CreateHashEntry(&psInfoPtr->fontTable, Tcl_DStringValue(&ds), &i);
    Tcl_DStringFree(&ds);

    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * Tk_CanvasPsBitmap --
 *
 *	This procedure is called to output the contents of a
 *	sub-region of a bitmap in proper image data format for
 *	Postscript (i.e. data between angle brackets, one bit
 *	per pixel).
 *
 * Results:
 *	Returns a standard Tcl return value.  If an error occurs
 *	then an error message will be left in interp->result.
 *	If no error occurs, then additional Postscript will be
 *	appended to interp->result.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

int
Tk_CanvasPsBitmap(interp, canvas, bitmap, startX, startY, width, height)
    Tcl_Interp *interp;			/* Interpreter for returning Postscript
					 * or error message. */
    Tk_Canvas canvas;			/* Information about canvas. */
    Pixmap bitmap;			/* Bitmap for which to generate
					 * Postscript. */
    int startX, startY;			/* Coordinates of upper-left corner
					 * of rectangular region to output. */
    int width, height;			/* Height of rectangular region. */
{
    TkCanvas *canvasPtr = (TkCanvas *) canvas;
    TkPostscriptInfo *psInfoPtr = canvasPtr->psInfoPtr;
    XImage *imagePtr;
    int charsInLine, x, y, lastX, lastY, value, mask;
    unsigned int totalWidth, totalHeight;
    char string[100];
    Window dummyRoot;
    int dummyX, dummyY;
    unsigned dummyBorderwidth, dummyDepth;

    if (psInfoPtr->prepass) {
	return TCL_OK;
    }

    /*
     * The following call should probably be a call to Tk_SizeOfBitmap
     * instead, but it seems that we are occasionally invoked by custom
     * item types that create their own bitmaps without registering them
     * with Tk.  XGetGeometry is a bit slower than Tk_SizeOfBitmap, but
     * it shouldn't matter here.
     */

    XGetGeometry(Tk_Display(Tk_CanvasTkwin(canvas)), bitmap, &dummyRoot,
	    (int *) &dummyX, (int *) &dummyY, (unsigned int *) &totalWidth,
	    (unsigned int *) &totalHeight, &dummyBorderwidth, &dummyDepth);
    imagePtr = XGetImage(Tk_Display(canvasPtr->tkwin), bitmap, 0, 0,
	    totalWidth, totalHeight, 1, XYPixmap);
    Tcl_AppendResult(interp, "<", (char *) NULL);
    mask = 0x80;
    value = 0;
    charsInLine = 0;
    lastX = startX + width - 1;
    lastY = startY + height - 1;
    for (y = lastY; y >= startY; y--) {
	for (x = startX; x <= lastX; x++) {
	    if (XGetPixel(imagePtr, x, y)) {
		value |= mask;
	    }
	    mask >>= 1;
	    if (mask == 0) {
		sprintf(string, "%02x", value);
		Tcl_AppendResult(interp, string, (char *) NULL);
		mask = 0x80;
		value = 0;
		charsInLine += 2;
		if (charsInLine >= 60) {
		    Tcl_AppendResult(interp, "\n", (char *) NULL);
		    charsInLine = 0;
		}
	    }
	}
	if (mask != 0x80) {
	    sprintf(string, "%02x", value);
	    Tcl_AppendResult(interp, string, (char *) NULL);
	    mask = 0x80;
	    value = 0;
	    charsInLine += 2;
	}
    }
    Tcl_AppendResult(interp, ">", (char *) NULL);
    XDestroyImage(imagePtr);
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * Tk_CanvasPsStipple --
 *
 *	This procedure is called by individual canvas items when
 *	they have created a path that they'd like to be filled with
 *	a stipple pattern.  Given information about an X bitmap,
 *	this procedure will generate Postscript commands to fill
 *	the current clip region using a stipple pattern defined by the
 *	bitmap.
 *
 * Results:
 *	Returns a standard Tcl return value.  If an error occurs
 *	then an error message will be left in interp->result.
 *	If no error occurs, then additional Postscript will be
 *	appended to interp->result.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

int
Tk_CanvasPsStipple(interp, canvas, bitmap)
    Tcl_Interp *interp;			/* Interpreter for returning Postscript
					 * or error message. */
    Tk_Canvas canvas;			/* Information about canvas. */
    Pixmap bitmap;			/* Bitmap to use for stippling. */
{
    TkCanvas *canvasPtr = (TkCanvas *) canvas;
    TkPostscriptInfo *psInfoPtr = canvasPtr->psInfoPtr;
    int width, height;
    char string[100];
    Window dummyRoot;
    int dummyX, dummyY;
    unsigned dummyBorderwidth, dummyDepth;

    if (psInfoPtr->prepass) {
	return TCL_OK;
    }

    /*
     * The following call should probably be a call to Tk_SizeOfBitmap
     * instead, but it seems that we are occasionally invoked by custom
     * item types that create their own bitmaps without registering them
     * with Tk.  XGetGeometry is a bit slower than Tk_SizeOfBitmap, but
     * it shouldn't matter here.
     */

    XGetGeometry(Tk_Display(Tk_CanvasTkwin(canvas)), bitmap, &dummyRoot,
	    (int *) &dummyX, (int *) &dummyY, (unsigned *) &width,
	    (unsigned *) &height, &dummyBorderwidth, &dummyDepth);
    sprintf(string, "%d %d ", width, height);
    Tcl_AppendResult(interp, string, (char *) NULL);
    if (Tk_CanvasPsBitmap(interp, (Tk_Canvas) canvasPtr, bitmap, 0, 0,
	    width, height) != TCL_OK) {
	return TCL_ERROR;
    }
    Tcl_AppendResult(interp, " StippleFill\n", (char *) NULL);
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * Tk_CanvasPsY --
 *
 *	Given a y-coordinate in canvas coordinates, this procedure
 *	returns a y-coordinate to use for Postscript output.
 *
 * Results:
 *	Returns the Postscript coordinate that corresponds to
 *	"y".
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

double
Tk_CanvasPsY(canvas, y)
    Tk_Canvas canvas;			/* Token for canvas on whose behalf
					 * Postscript is being generated. */
    double y;				/* Y-coordinate in canvas coords. */
{
    TkPostscriptInfo *psInfoPtr = ((TkCanvas *) canvas)->psInfoPtr;

    return psInfoPtr->y2 - y;
}

/*
 *--------------------------------------------------------------
 *
 * Tk_CanvasPsPath --
 *
 *	Given an array of points for a path, generate Postscript
 *	commands to create the path.
 *
 * Results:
 *	Postscript commands get appended to what's in interp->result.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

void
Tk_CanvasPsPath(interp, canvas, coordPtr, numPoints)
    Tcl_Interp *interp;			/* Put generated Postscript in this
					 * interpreter's result field. */
    Tk_Canvas canvas;			/* Canvas on whose behalf Postscript
					 * is being generated. */
    double *coordPtr;			/* Pointer to first in array of
					 * 2*numPoints coordinates giving
					 * points for path. */
    int numPoints;			/* Number of points at *coordPtr. */
{
    TkPostscriptInfo *psInfoPtr = ((TkCanvas *) canvas)->psInfoPtr;
    char buffer[200];

    if (psInfoPtr->prepass) {
	return;
    }
    sprintf(buffer, "%.15g %.15g moveto\n", coordPtr[0],
	    Tk_CanvasPsY(canvas, coordPtr[1]));
    Tcl_AppendResult(interp, buffer, (char *) NULL);
    for (numPoints--, coordPtr += 2; numPoints > 0;
	    numPoints--, coordPtr += 2) {
	sprintf(buffer, "%.15g %.15g lineto\n", coordPtr[0],
		Tk_CanvasPsY(canvas, coordPtr[1]));
	Tcl_AppendResult(interp, buffer, (char *) NULL);
    }
}

/*
 *--------------------------------------------------------------
 *
 * GetPostscriptPoints --
 *
 *	Given a string, returns the number of Postscript points
 *	corresponding to that string.
 *
 * Results:
 *	The return value is a standard Tcl return result.  If
 *	TCL_OK is returned, then everything went well and the
 *	screen distance is stored at *doublePtr;  otherwise
 *	TCL_ERROR is returned and an error message is left in
 *	interp->result.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

static int
GetPostscriptPoints(interp, string, doublePtr)
    Tcl_Interp *interp;		/* Use this for error reporting. */
    char *string;		/* String describing a screen distance. */
    double *doublePtr;		/* Place to store converted result. */
{
    char *end;
    double d;

    d = strtod(string, &end);
    if (end == string) {
	error:
	Tcl_AppendResult(interp, "bad distance \"", string,
		"\"", (char *) NULL);
	return TCL_ERROR;
    }
    while ((*end != '\0') && isspace(UCHAR(*end))) {
	end++;
    }
    switch (*end) {
	case 'c':
	    d *= 72.0/2.54;
	    end++;
	    break;
	case 'i':
	    d *= 72.0;
	    end++;
	    break;
	case 'm':
	    d *= 72.0/25.4;
	    end++;
	    break;
	case 0:
	    break;
	case 'p':
	    end++;
	    break;
	default:
	    goto error;
    }
    while ((*end != '\0') && isspace(UCHAR(*end))) {
	end++;
    }
    if (*end != 0) {
	goto error;
    }
    *doublePtr = d;
    return TCL_OK;
}