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/*************************************************************************
** SVGCharTspanTextHandler.cpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2019 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 "SVGCharTspanTextHandler.hpp"
#include "utility.hpp"
#include "XMLNode.hpp"
using namespace std;
SVGCharTspanTextHandler::SVGCharTspanTextHandler (bool selectFontByClass)
: SVGCharTextHandler(selectFontByClass)
{
resetContextNode();
}
void SVGCharTspanTextHandler::appendChar (uint32_t c, double x, double y) {
// changes of fonts and transformations require a new text element
if (!_textNode || _font.changed() || _matrix.changed() || _vertical.changed()) {
resetContextNode();
_textNode = pushContextNode(createTextNode(x, y));
_color.changed(true); // force creating tspan with color attribute if current color differs from font color
}
if (_tspanNode && (_xchanged || _ychanged || _color.changed())) {
// if drawing position or color was explicitly changed, finish current tspan element
popContextNode();
_tspanNode = nullptr;
}
// Apply text color changes only if the color of the entire font is black.
// Glyphs of non-black fonts (e.g. defined in a XeTeX document) can't change their color.
bool applyColor = _color.get() != Color::BLACK && _font.get()->color() == Color::BLACK;
if (_xchanged || _ychanged || (_color.changed() && applyColor)) {
_tspanNode = pushContextNode(util::make_unique<XMLElement>("tspan"));
if (applyColor)
_tspanNode->addAttribute("fill", _color.get().svgColorString());
_color.changed(false);
if (_xchanged) {
if (_vertical) {
// align glyphs designed for horizontal layout properly
if (auto pf = dynamic_cast<const PhysicalFont*>(_font.get()))
if (!pf->getMetrics()->verticalLayout())
x += pf->scaledAscent()/2.5; // move vertical baseline to the right by strikethrough offset
}
_tspanNode->addAttribute("x", x);
_xchanged = false;
}
if (_ychanged) {
_tspanNode->addAttribute("y", y);
_ychanged = false;
}
}
contextNode()->append(XMLString(_font.get()->unicode(c), false));
}
void SVGCharTspanTextHandler::setInitialContextNode (XMLElement *node) {
SVGCharHandler::setInitialContextNode(node);
_textNode = _tspanNode = nullptr;
_xchanged = _ychanged = false;
}
void SVGCharTspanTextHandler::resetContextNode () {
SVGCharHandler::resetContextNode();
_textNode = _tspanNode = nullptr;
_xchanged = _ychanged = false;
_font.changed(false);
_matrix.changed(false);
_vertical.changed(false);
}
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