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110 lines
3.8 KiB
C++
110 lines
3.8 KiB
C++
//
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// Copyright (C) 2020-2022 Greg Landrum and other RDKit contributors
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//
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// @@ All Rights Reserved @@
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// This file is part of the RDKit.
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// The contents are covered by the terms of the BSD license
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// which is included in the file license.txt, found at the root
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// of the RDKit source tree.
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//
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// Original author: Greg Landrum
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// A concrete class derived from DrawText that uses the JS Canvas
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// to draw text onto a picture.
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#ifdef __EMSCRIPTEN__
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#include <sstream>
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#include <boost/algorithm/string.hpp>
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#include <GraphMol/MolDraw2D/DrawTextJS.h>
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#include <GraphMol/MolDraw2D/MolDraw2DJS.h>
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#include <GraphMol/MolDraw2D/MolDraw2DDetails.h>
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#include <boost/format.hpp>
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namespace RDKit {
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std::string DrawColourToSVG(const RDKit::DrawColour &col);
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namespace MolDraw2D_detail {
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// ****************************************************************************
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DrawTextJS::DrawTextJS(double max_fnt_sz, double min_fnt_sz,
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emscripten::val &context)
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: DrawTextNotFT(max_fnt_sz, min_fnt_sz), context_(context) {}
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// ****************************************************************************
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// draw the char, with the bottom left hand corner at cds
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void DrawTextJS::drawChar(char c, const Point2D &cds) {
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std::string txt(1, c);
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std::string font = (boost::format("%fpx sans-serif") % fontSize()).str();
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std::string col = DrawColourToSVG(colour());
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context_.set("font", font);
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context_.set("fillStyle", col);
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context_.call<void>("fillText", txt, cds.x, cds.y);
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}
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// ****************************************************************************
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void DrawTextJS::getStringRects(const std::string &text,
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std::vector<std::shared_ptr<StringRect>> &rects,
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std::vector<TextDrawType> &draw_modes,
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std::vector<char> &draw_chars) const {
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double running_x = 0.0;
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double act_font_size = fontSize();
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double char_height;
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double max_width = 0.0;
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TextDrawType draw_mode = TextDrawType::TextDrawNormal;
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for (size_t i = 0; i < text.length(); ++i) {
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// setStringDrawMode moves i along to the end of any <sub> or <sup>
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// markup
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if ('<' == text[i] && setStringDrawMode(text, draw_mode, i)) {
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continue;
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}
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draw_modes.push_back(draw_mode);
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draw_chars.push_back(text[i]);
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max_width = std::max(
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max_width,
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static_cast<double>(MolDraw2D_detail::char_widths[(int)text[i]]));
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}
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for (size_t i = 0; i < draw_chars.size(); ++i) {
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double char_width =
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0.6 * act_font_size *
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static_cast<double>(MolDraw2D_detail::char_widths[(int)draw_chars[i]]) /
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max_width;
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// Absent a proper set of font metrics (we don't know what font we'll be
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// using, for starters) this is something of an empirical bodge.
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if (draw_chars[i] == '+') {
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char_height = 0.6 * act_font_size;
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} else if (draw_chars[i] == '-') {
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char_height = 0.4 * act_font_size;
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} else {
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char_height = 0.8 * act_font_size;
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}
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double cscale = selectScaleFactor(draw_chars[i], draw_modes[i]);
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char_height *= cscale;
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char_width *= cscale;
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Point2D offset(char_width / 2, char_height / 2);
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if (draw_chars[i] == '+' || draw_chars[i] == '-') {
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offset.y /= 2.0;
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}
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Point2D g_centre(char_width / 2, char_height / 2);
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rects.push_back(std::shared_ptr<StringRect>(
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new StringRect(offset, g_centre, char_width, char_height)));
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rects.back()->trans_.x += running_x;
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// empirical spacing.
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if (draw_modes[i] != TextDrawType::TextDrawNormal) {
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running_x += char_width * 1.05;
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} else {
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running_x += char_width * 1.15;
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}
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}
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for (auto r : rects) {
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r->g_centre_.y = act_font_size - r->g_centre_.y;
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r->offset_.y = act_font_size / 2.0;
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}
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adjustStringRectsForSuperSubScript(draw_modes, rects);
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}
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} // namespace MolDraw2D_detail
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} // namespace RDKit
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#endif // __EMSCRIPTEN__
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