diff options
author | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
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committer | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
commit | e0c6872cf40896c7be36b11dcc744620f10adf1d (patch) | |
tree | 60335e10d2f4354b0674ec22d7b53f0f8abee672 /dviware/dvisvgm/src/SVGCharTspanTextHandler.cpp |
Initial commit
Diffstat (limited to 'dviware/dvisvgm/src/SVGCharTspanTextHandler.cpp')
-rw-r--r-- | dviware/dvisvgm/src/SVGCharTspanTextHandler.cpp | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/dviware/dvisvgm/src/SVGCharTspanTextHandler.cpp b/dviware/dvisvgm/src/SVGCharTspanTextHandler.cpp new file mode 100644 index 0000000000..a48f5f9a93 --- /dev/null +++ b/dviware/dvisvgm/src/SVGCharTspanTextHandler.cpp @@ -0,0 +1,87 @@ +/************************************************************************* +** 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); +} |