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// -*-c++-*-
// fixg2sxd - a utility to convert fig to sxd format
// Copyright (C) 2003-2022 Alexander Bürger, acfb@users.sourceforge.net
// 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.
#include "xfigobjects.h"
#include "keep_range.h"
#include "misc.h"
#include "xmlwrite.h"
Poly::~Poly()
{
delete x;
delete y;
}
istream& Poly::read( istream& figfile )
{
LineFillStyle lfstmp;
lfstmp.read( figfile, sub_type, depth, true );
figfile >> cap_style
>> radius
>> forward_arrow
>> backward_arrow
>> npoints;
keep_range( sub_type, "poly sub_type", 1, 5 );
if( sub_type == 1 ) // cap_style is used only for polyline
keep_range( cap_style, "poly(polyline) cap_style", 0, 2 );
if( sub_type == 4 ) // radius is used only for arc-boxes
keep_range( radius, "poly(arc-box) radius", 0 );
keep_range( forward_arrow, "poly forward_arrow", 0, 1 );
keep_range( backward_arrow, "poly backward_arrow", 0, 1 );
// limit n.o. points somewhat arbitrarily
if( npoints<1 || npoints>65536 ) {
ostringstream err;
err << "Bad number of polygon points " << npoints
<< " (accepted range = [1,65536]).";
throw err.str();
}
if( forward_arrow != 0 )
lfstmp.read_arrow( figfile, true );
if( backward_arrow != 0 )
lfstmp.read_arrow( figfile, false );
if( sub_type == 5 ) { // picture
figfile >> flipped >> file;
}
x = new float[npoints];
y = new float[npoints];
for( int i=0; i<npoints; ++i )
figfile >> x[i] >> y[i];
lfs = linefillstyles.insert( lfstmp ).first;
if( sub_type == 1 ) {
lfs->stylename_line();
if( lfs->area_fill != -1 )
lfs->stylename_fill();
} else {
lfs->stylename();
}
return figfile;
}
void Poly::find_min_max( float& maxx, float& minx, float& maxy, float& miny, int begin, int end )
{
maxx = minx = x[begin];
maxy = miny = y[begin];
for( int i=begin+1; i<end; ++i ) { // start from begin+1!
if( x[i] > maxx ) maxx = x[i];
if( y[i] > maxy ) maxy = y[i];
if( x[i] < minx ) minx = x[i];
if( y[i] < miny ) miny = y[i];
}
}
ostream& Poly::write( ostream& out )
{
if( sub_type == 5 ) // imported-picture bounding-box
return write_image( out );
else if( sub_type == 2 || sub_type == 4 ) // box or arc-box
return write_rectangle( out );
else
return write_poly( out ); // polyline or polygon
}
ostream& Poly::write_image( ostream& out )
{
if( npoints != 5 )
fail( "image with != 5 points" );
// points are clockwise around the image => determine rotation
// from relative position of first two points
float angle = 0;
float maxx=0, maxy=0, minx=0, miny=0;
find_min_max( maxx, minx, maxy, miny, 0, npoints );
float width = maxx-minx, height= maxy-miny, posx=minx, posy=miny;
if( x[0] == x[1] ) {
swap( width, height );
if( y[0] > y[1] ) {
angle = M_PI/2;
posy += height;
} else {
angle = 3*M_PI/2;
posx += width;
}
} else if( x[0] > x[1] ) {
posx += width;
posy += height;
angle = M_PI;
}
Node image("draw:image");
image["draw:style-name"] << "gr_img";
image["draw:z-index"] << depth2z(depth);
image["draw:layer"] << "layout";
if( angle == 0 ) {
image["svg:x"] << tr(posx) << "cm";
image["svg:y"] << tr(posy) << "cm";
} else {
image["draw:transform"]
<< "rotate(" << angle << ")"
<< "translate(" << tr(posx) << "cm " << tr(posy) << "cm)";
}
image["svg:width"] << tr(width) << "cm";
image["svg:height"] << tr(height) << "cm";
image["xlink:href"] << file;
image["xlink:type"] << "simple";
image["xlink:show"] << "embed";
image["xlink:actuate"] << "onLoad";
return out << image;
}
ostream& Poly::write_rectangle( ostream& out )
{
float maxx=0, maxy=0, minx=0, miny=0;
find_min_max( maxx, minx, maxy, miny, 0, npoints );
Node rect("draw:rect");
rect["draw:style-name"] << lfs->stylename();
rect["draw:z-index"] << depth2z(depth);
if( sub_type == 4 ) { // rounded corners
rect["draw:corner-radius"] << tr80(radius) << "cm";
}
rect["draw:layer"] << "layout";
rect["svg:x"] << tr(minx) << "cm";
rect["svg:y"] << tr(miny) << "cm";
rect["svg:width"] << tr(maxx-minx) << "cm";
rect["svg:height"] << tr(maxy-miny) << "cm";
return out << rect;
}
ostream& Poly::write_poly( ostream& out )
{
// XXX: it looks like OOo has a bug and does not read attribute
// values longer than 64kB, so for a lot of points, it will not
// display anything; for lines, it is to split after some points
// (more difficult to split before reaching 64kB), but I do not
// know how to split an arbitrary, filled polygon
// in case of a long, unfilled polygon, make a group with smaller
// polygons
const int limit = 500;
const bool long_line = (sub_type==1 && npoints>limit && lfs->hasLine()
&& !lfs->hasFill());
const int step = long_line ? limit : npoints;
if( long_line ) {
static bool warn_split = false;
if( !warn_split ) {
cerr << "Warning: very long polylines will be split into pieces of "
<< limit << " points." << endl;
warn_split = true;
}
out << "<draw:g>" << endl;
}
for( int begin=0; begin<npoints-1; begin+=step-1 ) {
const int end = std::min(begin + step, npoints);
float maxx=0, maxy=0, minx=0, miny=0;
find_min_max( maxx, minx, maxy, miny, begin, end );
// store the polyline/polygon data temporarily
Node poly("draw:polygon");
poly["draw:z-index"] << depth2z(depth);
poly["draw:layer"] << "layout";
poly["svg:x"] << tr(minx) << "cm";
poly["svg:y"] << tr(miny) << "cm";
poly["svg:width"] << tr(maxx-minx) << "cm";
poly["svg:height"] << tr(maxy-miny) << "cm";
poly["svg:viewBox"] << "0 0 "<<tr_p(maxx-minx)<<' '<<tr_p(maxy-miny);
ostringstream& p = poly["draw:points"];
for( int i=begin; i<end; ++i )
p << tr_p(x[i]-minx) << ',' << tr_p(y[i]-miny) << ' ';
if( p.str().size() >= 1<<16 ) {
static bool warn_long = false;
if( !warn_long ) {
cerr << "Warning: some polylines/polygons might be too large"
" for OpenOffice.org." << endl;
warn_long = true;
}
}
// now decide what to write
if( sub_type == 1 ) { // polyline
if( lfs->hasFill() ) {
// a polyline may be filled, but then it is missing the
// last segment of the border
poly["draw:style-name"] << lfs->stylename_fill();
out << poly;
}
if( lfs->hasLine() ) {
poly.SetName("draw:polyline");
poly["draw:style-name"] << lfs->stylename_line();
out << poly;
}
} else {
if( lfs->hasLine() || lfs->hasFill() ) {
poly["draw:style-name"] << lfs->stylename();
out << poly;
}
}
}
if( long_line )
out << "</draw:g>" << endl;
return out;
}
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