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/*************************************************************************
** PSPattern.cpp **
** **
** This file is part of dvisvgm -- the DVI to SVG converter **
** Copyright (C) 2005-2013 Martin Gieseking <martin.gieseking@uos.de> **
** **
** 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 3 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, see <http://www.gnu.org/licenses/>. **
*************************************************************************/
#include <sstream>
#include <vector>
#include "BoundingBox.h"
#include "PSPattern.h"
#include "SpecialActions.h"
#include "SVGTree.h"
#include "XMLNode.h"
using namespace std;
string PSPattern::svgID () const {
return XMLString("pat")+XMLString(_id);
}
/** Appends the definition of this pattern to the "def" section of the SVG tree. */
void PSPattern::apply (SpecialActions *actions) {
if (XMLElementNode *pattern = createPatternNode())
actions->appendToDefs(pattern);
}
/////////////////////////////////////////////////////////////////////////////
PSTilingPattern::PSTilingPattern (int id, BoundingBox &bbox, Matrix &matrix, double xstep, double ystep)
: PSPattern(id), _bbox(bbox), _matrix(matrix), _xstep(xstep), _ystep(ystep), _groupNode(0)
{
const double bp2pt = 72.27/72.0; // factor to convert bp to pt
_bbox.scale(bp2pt, bp2pt);
_xstep *= bp2pt;
_ystep *= bp2pt;
_groupNode = PSTilingPattern::createGroupNode();
}
PSTilingPattern::~PSTilingPattern () {
delete _groupNode;
}
/** Creates a new pattern element representing the pattern defined in the PS code. */
XMLElementNode* PSTilingPattern::createPatternNode () const {
if (!_groupNode)
return 0;
BoundingBox box(_bbox.minX(), _bbox.minY(), _bbox.minX()+_xstep, _bbox.minY()+_ystep);
XMLElementNode *pattern = new XMLElementNode("pattern");
pattern->addAttribute("id", svgID());
pattern->addAttribute("x", box.minX());
pattern->addAttribute("y", box.minY());
pattern->addAttribute("width", box.width());
pattern->addAttribute("height", box.height());
pattern->addAttribute("viewBox", box.toSVGViewBox());
pattern->addAttribute("patternUnits", "userSpaceOnUse");
if (!_matrix.isIdentity())
pattern->addAttribute("patternTransform", _matrix.getSVG());
if (_xstep < _bbox.width() || _ystep < _bbox.height()) { // overlapping tiles?
// disable clipping at the tile borders => tiles become "transparent"
pattern->addAttribute("overflow", "visible");
}
if (XMLElementNode *clip=createClipNode())
pattern->append(clip);
pattern->append(_groupNode);
return pattern;
}
/** Creates a new clip element restricting the drawing area to the
* dimensions given in the definition of the pattern. */
XMLElementNode* PSTilingPattern::createClipNode() const {
XMLElementNode *clip = new XMLElementNode("clipPath");
clip->addAttribute("id", "pc"+XMLString(psID()));
XMLElementNode *rect = new XMLElementNode("rect");
rect->addAttribute("x", _bbox.minX());
rect->addAttribute("y", _bbox.minY());
rect->addAttribute("width", _bbox.width());
rect->addAttribute("height", _bbox.height());
clip->append(rect);
return clip;
}
/** Creates a new group element that contains all "drawing" elements that
* define the pattern graphic. */
XMLElementNode* PSTilingPattern::createGroupNode () const {
// add all succeeding path elements to this group
XMLElementNode *group = new XMLElementNode("g");
group->addAttribute("clip-path", XMLString("url(#pc")+XMLString(psID())+")");
return group;
}
void PSTilingPattern::apply (SpecialActions *actions) {
PSPattern::apply(actions);
_groupNode = 0;
}
/////////////////////////////////////////////////////////////////////////////
PSColoredTilingPattern::PSColoredTilingPattern (int id, BoundingBox &bbox, Matrix &matrix, double xstep, double ystep)
: PSTilingPattern(id, bbox, matrix, xstep, ystep)
{
}
/////////////////////////////////////////////////////////////////////////////
PSUncoloredTilingPattern::PSUncoloredTilingPattern (int id, BoundingBox &bbox, Matrix &matrix, double xstep, double ystep)
: PSTilingPattern(id, bbox, matrix, xstep, ystep), _applied(false)
{
}
PSUncoloredTilingPattern::~PSUncoloredTilingPattern () {
if (_applied)
setGroupNode(0); // prevent deleting the group node in the parent destructor
}
/** Returns an SVG id value that identifies this pattern with the current color applied. */
string PSUncoloredTilingPattern::svgID () const {
ostringstream oss;
oss << PSPattern::svgID() << '-' << hex << _currentColor;
return oss.str();
}
/** Appends the definition of this pattern with the current color applied
* to the "def" section of the SVG tree. */
void PSUncoloredTilingPattern::apply (SpecialActions* actions) {
set<Color>::iterator it=_colors.find(_currentColor);
if (it == _colors.end()) {
if (_applied)
setGroupNode(static_cast<XMLElementNode*>(getGroupNode()->clone()));
// assign current color to the pattern graphic
vector<XMLElementNode*> colored_elems;
const char *attribs[] = {"fill", "stroke"};
for (int i=0; i < 2; i++) {
getGroupNode()->findDescendants(0, attribs[i], colored_elems);
for (vector<XMLElementNode*>::iterator it=colored_elems.begin(); it != colored_elems.end(); ++it)
if (string((*it)->getAttributeValue(attribs[i])) != "none")
(*it)->addAttribute(attribs[i], _currentColor.rgbString());
colored_elems.clear();
}
PSPattern::apply(actions);
_colors.insert(_currentColor);
_applied = true;
}
}
XMLElementNode* PSUncoloredTilingPattern::createClipNode() const {
// only the first instance of this patterns get a clip element
if (_colors.empty())
return PSTilingPattern::createClipNode();
return 0;
}
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