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/*
drvMPOST.cpp : This file is part of pstoedit
Backend for MetaPost files
Contributed by: Scott Pakin <scott+ps2ed_AT_pakin.org>
Copyright (C) 1993 - 2009 Wolfgang Glunz, wglunz35_AT_geocities.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifdef _MSC_VER
// #define _POSIX_ // for MSVC and limits.h
#endif
#include "drvmpost.h"
// #include I_fstream
#include I_stdio
#include I_stdlib
#include <math.h> // Need definition of FLT_MAX
#include <float.h> // FLT_MAX on MSVC
#include <limits.h> // PATH_MAX for MSVC
#include <ctype.h> // Need definition of ispunct()
#if !(defined(unix) || defined(__unix__) || defined(_unix) || defined(__unix) || defined(__EMX__) || defined (NetBSD) )
#define LINE_MAX 2048 // for MSVC
#endif
static const string emptystring("");
// Constructor -- Initialize variables and take other per-document actions
drvMPOST::derivedConstructor(drvMPOST):
constructBase,
// Initialize member variables
prevFontName(""), prevR(0.0f), prevG(0.0f), prevB(0.0f), // Black
prevFontAngle(FLT_MAX), prevFontSize(-1.0), prevLineWidth(0.0f), prevLineCap(1), // Round line caps
prevLineJoin(1), // Round joins
prevDashPattern(""), // Solid lines
fillmode(false)
{
// Prevent the use of scientific notation, which MetaPost
// doesn't understand. For now, we hardwire the precision to
// 6 digits after the decimal point.
outf.setf(ios::fixed);
outf.precision(6);
// Output copyright information
outf << "% Converted from PostScript(TM) to MetaPost by pstoedit\n"
<<
"% MetaPost backend contributed by Scott Pakin <scott+ps2ed_AT_pakin.org>\n"
<< "% pstoedit is Copyright (C) 1993 - 2009 Wolfgang Glunz" <<
" <wglunz35_AT_pstoedit.net>\n\n";
/*
* Output some useful assignments and macro defintions
*
* Thanks to S.J.Henriksen <eesjh_AT_ee.newcastle.edu.au> for the showtext
* macro
*/
outf << "% Generate structured PostScript\n"
<< "prologues := 1;\n"
<< "\n"
<<
"% Display a given string with its *baseline* at a given location\n"
<< "% and with a given rotation angle\n" <<
"vardef showtext(expr origin)(expr angle)(expr string) =\n" <<
" draw string infont defaultfont scaled defaultscale\n" <<
" rotated angle shifted origin;\n" << "enddef;\n" << endl;
}
// Destructor -- Tell MetaPost to end the file
drvMPOST::~drvMPOST()
{
outf << "end" << endl;
options=0;
}
// Output a path
void drvMPOST::print_coords()
{
bool withinpath = false; // true=already started plotting points
unsigned int pointsOnLine = 0; // Number of points on the current output line
if (fillmode) {
for (unsigned int n = 0; n < numberOfElementsInPath(); n++) {
const basedrawingelement & elem = pathElement(n);
switch (elem.getType()) {
case moveto:
case lineto:
{
const Point & p = elem.getPoint(0);
if (withinpath)
outf << "--";
else
outf << "fill ";
outf << '(' << (p.x_ + x_offset) << ',' << (p.y_ + y_offset)
<< ')';
withinpath = true;
pointsOnLine++;
}
break;
case closepath:
if (prevDashPattern == emptystring)
outf << "--cycle;" << endl;
else
outf << "--cycle " << prevDashPattern << ';' << endl;
withinpath = false;
pointsOnLine = 0;
break;
case curveto:
{
if (!withinpath) {
cerr << "curveto without a moveto; ignoring" << endl;
break;
}
const Point & p0 = elem.getPoint(0);
outf << "..controls (" << (p0.x_ + x_offset)
<< ',' << (p0.y_ + y_offset) << ") and (";
const Point & pt1 = elem.getPoint(1);
outf << (pt1.x_ + x_offset) << ',' << (pt1.y_ + y_offset) << ")..(";
const Point & pt2 = elem.getPoint(2);
outf << (pt2.x_ + x_offset) << ',' << (pt2.y_ + y_offset) << ')';
pointsOnLine += 3;
withinpath = true;
}
break;
default:
errf << "\t\tFatal: unexpected path element in drvmpost" << endl;
abort();
break;
}
if (pointsOnLine >= 3) {
outf << "\n\t";
pointsOnLine = 0;
}
}
if (withinpath) { // Finish the final path
if (prevDashPattern == emptystring)
outf << "--cycle;" << endl;
else
outf << "--cycle " << prevDashPattern << ';' << endl;
}
} else { // Stroking, not filling
for (unsigned int n = 0; n < numberOfElementsInPath(); n++) {
const basedrawingelement & elem = pathElement(n);
switch (elem.getType()) {
case moveto:
{
if (withinpath)
outf << prevDashPattern << ';' << endl;
outf << "draw ";
const Point & p = elem.getPoint(0);
outf << '(' << (p.x_ + x_offset) << ',' << (p.y_ + y_offset)
<< ')';
withinpath = true;
pointsOnLine = 1; // Contrast with the case where fillmode is set
}
break;
case lineto:
{
const Point & p = elem.getPoint(0);
if (withinpath) {
outf << "--";
} else {
cerr << "lineto without a moveto; ignoring" << endl;
break;
}
outf << '(' << (p.x_ + x_offset) << ',' << (p.y_ + y_offset)
<< ')';
withinpath = true;
pointsOnLine++;
}
break;
case closepath:
if (prevDashPattern == emptystring ) {
outf << "--cycle;" << endl;
} else {
outf << "--cycle " << prevDashPattern << ';' << endl;
}
withinpath = false;
pointsOnLine = 0;
break;
case curveto:
{
if (!withinpath) {
cerr << "curveto without a moveto; ignoring" << endl;
break;
}
const Point & p0 = elem.getPoint(0);
outf << "..controls (" << (p0.x_ + x_offset)
<< ',' << (p0.y_ + y_offset) << ") and (";
const Point & pt1 = elem.getPoint(1);
outf << (pt1.x_ + x_offset) << ',' << (pt1.y_ + y_offset) << ")..(";
const Point & pt2 = elem.getPoint(2);
outf << (pt2.x_ + x_offset) << ',' << (pt2.y_ + y_offset) << ')';
pointsOnLine += 3;
withinpath = true;
}
break;
default:
errf << "\t\tFatal: unexpected path element in drvmpost" << endl;
abort();
break;
}
if (pointsOnLine >= 3 &&
n + 1 < numberOfElementsInPath() && pathElement(n + 1).getType() != moveto) {
outf << "\n\t";
pointsOnLine = 0;
}
}
if (withinpath) { // Finish the final path
outf << prevDashPattern << ';' << endl;
}
}
}
// Each page will produce a different figure
void drvMPOST::open_page()
{
outf << "beginfig(" << currentPageNumber << ");" << endl;
}
void drvMPOST::close_page()
{
outf << "endfig;" << endl;
}
// Output a text string
void drvMPOST::show_text(const TextInfo & textinfo)
{
static bool texshortchar = false; // 0=ASCII; 1=TeX character set
// Change fonts
string thisFontName(textinfo.currentFontName.value());
if (thisFontName == emptystring ) { // If we're this brain-damaged, we must be a TeX font
thisFontName = textinfo.currentFontFullName.value();
if (!texshortchar) {
outf << "shortchar := char(24);" << endl; // Cedilla in TeX land
texshortchar = true;
}
if (Verbose() && thisFontName != prevFontName)
errf << "nameless font (" << thisFontName << "?) -- "
<< "assuming TeX character set" << endl;
} else if (texshortchar) {
outf << "shortchar := \"_\";" << endl;
texshortchar = false;
}
if (thisFontName != prevFontName) {
outf << "defaultfont := \"" << thisFontName << "\";" << endl;
prevFontName = thisFontName;
}
// Change colors
if (textinfo.currentR != prevR || textinfo.currentG != prevG || textinfo.currentB != prevB) {
outf << "drawoptions (withcolor ("
<< textinfo.currentR << ',' << textinfo.
currentG << ',' << textinfo.currentB << "));" << endl;
prevR = textinfo.currentR;
prevG = textinfo.currentG;
prevB = textinfo.currentB;
}
// Change font size
if (textinfo.currentFontSize != prevFontSize) {
if (textinfo.currentFontSize > 0) {
outf << "defaultscale := " << textinfo.currentFontSize
<< "/fontsize defaultfont;" << endl;
prevFontSize = textinfo.currentFontSize;
} else {
if (Verbose())
errf << "warning: font size of " << textinfo.
currentFontSize << "pt encountered; ignoring" << endl;
outf << "%defaultscale := " << textinfo.
currentFontSize << "/fontsize defaultfont;" << endl;
}
}
// Change rotation
if (textinfo.currentFontAngle != prevFontAngle)
prevFontAngle = textinfo.currentFontAngle;
// Output the text using macros defined in the constructor
outf << "showtext ((" << textinfo.x << ',' << textinfo.y << "), " << prevFontAngle << ", \"";
for (const char *c = textinfo.thetext.value(); *c; c++)
if (*c == '"')
outf << "\" & char(34) & \"";
else
outf << (*c);
outf << "\");" << endl;
}
// Output a path
void drvMPOST::show_path()
{
// Change colors
if (currentR() != prevR || currentG() != prevG || currentB() != prevB) {
prevR = currentR();
prevG = currentG();
prevB = currentB();
outf << "drawoptions (withcolor ("
<< prevR << ',' << prevG << ',' << prevB << "));" << endl;
}
// Change line width
if (currentLineWidth() != prevLineWidth) {
prevLineWidth = currentLineWidth();
outf << "pickup pencircle scaled " << prevLineWidth << "bp;" << endl;
}
// Change line cap
if (currentLineCap() != prevLineCap) {
prevLineCap = currentLineCap();
switch (prevLineCap) {
case 0:
outf << "linecap := butt;" << endl;
break;
case 1:
outf << "linecap := rounded;" << endl;
break;
case 2:
outf << "linecap := squared;" << endl;
break;
default:
errf << "\t\tFatal: Unknown linecap \"" << prevLineCap << '"' << endl;
abort();
break;
}
}
// Change line join
if (currentLineJoin() != prevLineJoin) {
prevLineJoin = currentLineJoin();
switch (prevLineJoin) {
case 0:
outf << "linejoin := mitered;" << endl;
break;
case 1:
outf << "linejoin := rounded;" << endl;
break;
case 2:
outf << "linejoin := beveled;" << endl;
break;
default:
errf << "\t\tFatal: Unknown linejoin \"" << prevLineJoin << '"' << endl;
abort();
break;
}
}
// Change dash pattern
const char *currentDashPattern = dashPattern(); // Current dash pattern string
unsigned long lengthOn, lengthOff; // Fraction on vs. off
float dashOffset; // Offset into dash pattern
if (sscanf_s(currentDashPattern, "[ ] %f", &dashOffset) == 1)
prevDashPattern = "";
else {
char temptext[100];
if (sscanf_s(currentDashPattern, "[%lu] %f", &lengthOn, &dashOffset)
== 2) {
if (dashOffset)
sprintf_s(TARGETWITHLEN(temptext,100),
" dashed evenly scaled %lubp shifted -%fbp", lengthOn, dashOffset);
else
sprintf_s(TARGETWITHLEN(temptext,100), " dashed evenly scaled %lubp", lengthOn);
prevDashPattern = temptext;
} else
if (sscanf_s
(currentDashPattern, "[%lu %lu] %f", &lengthOn, &lengthOff, &dashOffset) == 3) {
if (dashOffset)
sprintf_s(TARGETWITHLEN(temptext,100),
" dashed dashpattern(on %lubp off %lubp) shifted (-%f,0)",
lengthOn, lengthOff, dashOffset);
else
sprintf_s(TARGETWITHLEN(temptext,100), " dashed dashpattern(on %lubp off %lubp)", lengthOn, lengthOff);
prevDashPattern = temptext;
} else {
if (Verbose())
cerr << "Dash pattern \"" << currentDashPattern <<
"\" is too complex;\n" << "using a generic pattern instead" << endl;
prevDashPattern = " dashed evenly";
}
}
// Determine the fill mode
if (Verbose() && currentShowType() == drvbase::eofill)
errf << "MetaPost does not support eofill; using fill instead" << endl;
fillmode = (currentShowType() == drvbase::eofill || currentShowType() == drvbase::fill);
if (!fillmode && currentShowType() != drvbase::stroke) {
errf << "\t\tFatal: unexpected show type " << (int)
currentShowType() << " in drvmpost" << endl;
abort();
}
// Draw the path
print_coords();
}
static DriverDescriptionT < drvMPOST > D_mpost("mpost", "MetaPost Format", "","mp", true, // if backend supports subpathes, else 0
// if subpathes are supported, the backend must deal with
// sequences of the following form
// moveto (start of subpath)
// lineto (a line segment)
// lineto
// moveto (start of a new subpath)
// lineto (a line segment)
// lineto
//
// If this argument is set to 0 each subpath is drawn
// individually which might not necessarily represent
// the original drawing.
true, // if backend supports curves, else 0
false, // if backend supports elements with fill and edges
true, // if backend supports text, else 0
DriverDescription::noimage, // no support for PNG file images
DriverDescription::normalopen, true, // if format supports multiple pages in one file
false /*clipping */
);
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