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//
// @@ All Rights Reserved @@
// This file is part of the RDKit.
// The contents are covered by the terms of the BSD license
// which is included in the file license.txt, found at the root
// of the RDKit source tree.
//
// Original author: David Cosgrove (CozChemIx) on 29/04/2020.
//
// A concrete class derived from DrawText that uses SVG
// to draw text onto a picture.
#include <sstream>
#include <boost/algorithm/string.hpp>
#include <GraphMol/MolDraw2D/DrawTextSVG.h>
#include <GraphMol/MolDraw2D/MolDraw2DSVG.h>
#include <GraphMol/MolDraw2D/MolDraw2DDetails.h>
namespace RDKit {
std::string DrawColourToSVG(const RDKit::DrawColour &col);
// ****************************************************************************
DrawTextSVG::DrawTextSVG(double max_fnt_sz, double min_fnt_sz,
std::ostream &oss, std::string &d_act_class)
: DrawText(max_fnt_sz, min_fnt_sz),
oss_(oss),
d_active_class_(d_act_class) {}
namespace {
void escape_xhtml(std::string &data) {
boost::algorithm::replace_all(data, "&", "&");
boost::algorithm::replace_all(data, "\"", """);
boost::algorithm::replace_all(data, "\'", "'");
boost::algorithm::replace_all(data, "<", "<");
boost::algorithm::replace_all(data, ">", ">");
}
} // namespace
// ****************************************************************************
// draw the char, with the bottom left hand corner at cds
void DrawTextSVG::drawChar(char c, const Point2D &cds) {
unsigned int fontSz = fontSize();
std::string col = DrawColourToSVG(colour());
oss_ << "<text";
oss_ << " x='" << cds.x;
oss_ << "' y='" << cds.y << "'";
if (!d_active_class_.empty()) {
oss_ << " class='" << d_active_class_ << "'";
}
std::string cs;
cs += c;
escape_xhtml(cs);
oss_ << " style='font-size:" << fontSz
<< "px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;"
"font-family:sans-serif;text-anchor:start;"
<< "fill:" << col << "'";
oss_ << " >";
oss_ << cs;
oss_ << "</text>" << std::endl;
}
// ****************************************************************************
void DrawTextSVG::getStringRects(
const std::string &text, std::vector<std::shared_ptr<StringRect>> &rects,
std::vector<TextDrawType> &draw_modes,
std::vector<char> &draw_chars) const {
double running_x = 0.0;
double act_font_size = fontSize();
double char_height;
double max_width = 0.0;
TextDrawType draw_mode = TextDrawType::TextDrawNormal;
for (size_t i = 0; i < text.length(); ++i) {
// setStringDrawMode moves i along to the end of any <sub> or <sup>
// markup
if ('<' == text[i] && setStringDrawMode(text, draw_mode, i)) {
continue;
}
draw_modes.push_back(draw_mode);
draw_chars.push_back(text[i]);
max_width = std::max(
max_width,
static_cast<double>(MolDraw2D_detail::char_widths[(int)text[i]]));
}
for (size_t i = 0; i < draw_chars.size(); ++i) {
double char_width =
0.6 * act_font_size *
static_cast<double>(MolDraw2D_detail::char_widths[(int)draw_chars[i]]) /
max_width;
// Absent a proper set of font metrics (we don't know what font we'll be
// using, for starters) this is something of an empirical bodge.
if (draw_chars[i] == '+') {
char_height = 0.6 * act_font_size;
} else if (draw_chars[i] == '-') {
char_height = 0.4 * act_font_size;
} else {
char_height = 0.8 * act_font_size;
}
double cscale = selectScaleFactor(draw_chars[i], draw_modes[i]);
char_height *= cscale;
char_width *= cscale;
Point2D offset(char_width / 2, char_height / 2);
if (draw_chars[i] == '+' || draw_chars[i] == '-') {
offset.y /= 2.0;
}
Point2D g_centre(char_width / 2, char_height / 2);
rects.push_back(std::shared_ptr<StringRect>(
new StringRect(offset, g_centre, char_width, char_height)));
rects.back()->trans_.x += running_x;
// empirical spacing.
if (draw_modes[i] != TextDrawType::TextDrawNormal) {
running_x += char_width * 1.05;
} else {
running_x += char_width * 1.15;
}
}
for (auto r : rects) {
r->g_centre_.y = act_font_size - r->g_centre_.y;
r->offset_.y = act_font_size / 2.0;
}
adjustStringRectsForSuperSubScript(draw_modes, rects);
}
} // namespace RDKit
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