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//
// Copyright (C) 2020 Greg Landrum and T5 Informatics GmbH
// @@ 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.
//
//
#include "DrawTextQt.h"
#include <QPainter>
#include <QCoreApplication>
#include <GraphMol/MolDraw2D/MolDraw2D.h>
#include <GraphMol/MolDraw2D/MolDraw2DDetails.h>
using namespace std;
namespace RDKit {
namespace MolDraw2D_detail {
// ****************************************************************************
DrawTextQt::DrawTextQt(double max_fnt_sz, double min_fnt_sz, QPainter *qp)
: DrawTextNotFT(max_fnt_sz, min_fnt_sz), d_qp(qp) {
PRECONDITION(
QCoreApplication::instance(),
"need a global QGuiApplication instance to use the Qt font system");
QFont font("Sans Serif", fontSize());
d_qp->setFont(font);
}
// ****************************************************************************
// draw the char, with the bottom left hand corner at cds
void DrawTextQt::drawChar(char c, const Point2D &cds) {
auto font = d_qp->font();
font.setPixelSize(fontSize());
d_qp->setFont(font);
QPointF loc(cds.x, cds.y);
QChar qc(c);
QString text(qc);
const auto col = colour();
QColor qcol(int(255.0 * col.r), int(255.0 * col.g), int(255.0 * col.b),
int(255.0 * col.a));
d_qp->setPen(qcol);
d_qp->drawText(loc, text);
}
// ****************************************************************************
void DrawTextQt::getStringRects(const string &text,
vector<shared_ptr<StringRect>> &rects,
vector<TextDrawType> &draw_modes,
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;
QFontMetrics qfm(d_qp->font());
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>(qfm.boundingRect(QChar(draw_chars[i])).width()));
}
for (size_t i = 0; i < draw_chars.size(); ++i) {
auto br = qfm.boundingRect(QChar(draw_chars[i]));
double char_width = 0.6 * act_font_size * br.width() / max_width;
// Absent real formatted string handling 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 MolDraw2D_detail
} // namespace RDKit
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