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//
// Copyright (C) 2015 Greg Landrum
//
// @@ 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.
//
// derived from Dave Cosgrove's MolDraw2D
//
#include "MolDraw2DCairo.h"
#include <cairo.h>
namespace RDKit {
void MolDraw2DCairo::initDrawing() {
PRECONDITION(dp_cr, "no draw context");
cairo_select_font_face(dp_cr, "sans", CAIRO_FONT_SLANT_NORMAL,
CAIRO_FONT_WEIGHT_NORMAL);
cairo_set_line_cap(dp_cr, CAIRO_LINE_CAP_BUTT);
}
// ****************************************************************************
void MolDraw2DCairo::finishDrawing() {}
// ****************************************************************************
void MolDraw2DCairo::setColour(const DrawColour &col) {
PRECONDITION(dp_cr, "no draw context");
MolDraw2D::setColour(col);
cairo_set_source_rgb(dp_cr, col.get<0>(), col.get<1>(), col.get<2>());
}
// ****************************************************************************
void MolDraw2DCairo::drawLine(const Point2D &cds1, const Point2D &cds2) {
PRECONDITION(dp_cr, "no draw context");
Point2D c1 = getDrawCoords(cds1);
Point2D c2 = getDrawCoords(cds2);
unsigned int width = lineWidth();
std::string dashString = "";
cairo_set_line_width(dp_cr, width);
const DashPattern &dashes = dash();
if (dashes.size()) {
double *dd = new double[dashes.size()];
std::copy(dashes.begin(), dashes.end(), dd);
cairo_set_dash(dp_cr, dd, dashes.size(), 0);
delete[] dd;
} else {
cairo_set_dash(dp_cr, nullptr, 0, 0);
}
cairo_move_to(dp_cr, c1.x, c1.y);
cairo_line_to(dp_cr, c2.x, c2.y);
cairo_stroke(dp_cr);
}
void MolDraw2DCairo::drawWavyLine(const Point2D &cds1, const Point2D &cds2,
const DrawColour &col1,
const DrawColour &col2,
unsigned int nSegments, double vertOffset) {
PRECONDITION(dp_cr, "no draw context");
PRECONDITION(nSegments > 1, "too few segments");
RDUNUSED_PARAM(col2);
if (nSegments % 2)
++nSegments; // we're going to assume an even number of segments
Point2D perp = calcPerpendicular(cds1, cds2);
Point2D delta = (cds2 - cds1);
perp *= vertOffset;
delta /= nSegments;
Point2D c1 = getDrawCoords(cds1);
unsigned int width = lineWidth();
cairo_set_line_width(dp_cr, width);
cairo_set_dash(dp_cr, nullptr, 0, 0);
setColour(col1);
cairo_move_to(dp_cr, c1.x, c1.y);
for (unsigned int i = 0; i < nSegments; ++i) {
Point2D startpt = cds1 + delta * i;
Point2D segpt = getDrawCoords(startpt + delta);
Point2D cpt1 =
getDrawCoords(startpt + delta / 3. + perp * (i % 2 ? -1 : 1));
Point2D cpt2 =
getDrawCoords(startpt + delta * 2. / 3. + perp * (i % 2 ? -1 : 1));
// if (i == nSegments / 2 && col2 != col1) setColour(col2);
cairo_curve_to(dp_cr, cpt1.x, cpt1.y, cpt2.x, cpt2.y, segpt.x, segpt.y);
}
cairo_stroke(dp_cr);
}
// ****************************************************************************
// draw the char, with the bottom left hand corner at cds
void MolDraw2DCairo::drawChar(char c, const Point2D &cds) {
PRECONDITION(dp_cr, "no draw context");
char txt[2];
txt[0] = c;
txt[1] = 0;
cairo_text_extents_t extents;
cairo_text_extents(dp_cr, txt, &extents);
Point2D c1 = cds;
cairo_move_to(dp_cr, c1.x, c1.y);
cairo_show_text(dp_cr, txt);
cairo_stroke(dp_cr);
}
// ****************************************************************************
void MolDraw2DCairo::drawPolygon(const std::vector<Point2D> &cds) {
PRECONDITION(dp_cr, "no draw context");
PRECONDITION(cds.size() >= 3, "must have at least three points");
cairo_line_cap_t olinecap = cairo_get_line_cap(dp_cr);
cairo_line_join_t olinejoin = cairo_get_line_join(dp_cr);
cairo_set_line_cap(dp_cr, CAIRO_LINE_CAP_BUTT);
cairo_set_line_join(dp_cr, CAIRO_LINE_JOIN_BEVEL);
cairo_set_line_width(dp_cr, lineWidth());
cairo_set_dash(dp_cr, nullptr, 0, 0);
for (unsigned int i = 0; i < cds.size(); ++i) {
Point2D lc = getDrawCoords(cds[i]);
if (!i)
cairo_move_to(dp_cr, lc.x, lc.y);
else
cairo_line_to(dp_cr, lc.x, lc.y);
}
cairo_close_path(dp_cr);
if (fillPolys()) cairo_fill_preserve(dp_cr);
cairo_stroke(dp_cr);
cairo_set_line_cap(dp_cr, olinecap);
cairo_set_line_join(dp_cr, olinejoin);
}
// ****************************************************************************
void MolDraw2DCairo::clearDrawing() {
PRECONDITION(dp_cr, "no draw context");
setColour(drawOptions().backgroundColour);
cairo_rectangle(dp_cr, 0, 0, width(), height());
cairo_fill(dp_cr);
}
// ****************************************************************************
void MolDraw2DCairo::setFontSize(double new_size) {
PRECONDITION(dp_cr, "no draw context");
MolDraw2D::setFontSize(new_size);
double font_size_in_points = fontSize() * scale();
cairo_set_font_size(dp_cr, font_size_in_points);
}
// ****************************************************************************
// using the current scale, work out the size of the label in molecule
// coordinates
void MolDraw2DCairo::getStringSize(const std::string &label,
double &label_width,
double &label_height) const {
PRECONDITION(dp_cr, "no draw context");
label_width = 0.0;
label_height = 0.0;
TextDrawType draw_mode = TextDrawNormal;
bool had_a_super = false;
char txt[2];
txt[1] = 0;
for (int i = 0, is = label.length(); i < is; ++i) {
// setStringDrawMode moves i along to the end of any <sub> or <sup>
// markup
if ('<' == label[i] && setStringDrawMode(label, draw_mode, i)) {
continue;
}
txt[0] = label[i];
cairo_text_extents_t extents;
cairo_text_extents(dp_cr, txt, &extents);
double twidth = extents.x_advance, theight = extents.height;
label_height = std::max(label_height, theight / scale());
double char_width = twidth / scale();
if (TextDrawSubscript == draw_mode) {
char_width *= 0.75;
} else if (TextDrawSuperscript == draw_mode) {
char_width *= 0.75;
had_a_super = true;
}
label_width += char_width;
}
// subscript keeps its bottom in line with the bottom of the bit chars,
// superscript goes above the original char top by a quarter
if (had_a_super) {
label_height *= 1.25;
}
label_height *= 1.2; // empirical
}
namespace {
cairo_status_t grab_str(void *closure, const unsigned char *data,
unsigned int len) {
std::string *str_ptr = (std::string *)closure;
(*str_ptr) += std::string((const char *)data, len);
return CAIRO_STATUS_SUCCESS;
}
}
std::string MolDraw2DCairo::getDrawingText() const {
PRECONDITION(dp_cr, "no draw context");
std::string res = "";
cairo_surface_t *surf = cairo_get_target(dp_cr);
cairo_surface_write_to_png_stream(surf, &grab_str, (void *)&res);
return res;
};
void MolDraw2DCairo::writeDrawingText(const std::string &fName) const {
PRECONDITION(dp_cr, "no draw context");
cairo_surface_t *surf = cairo_get_target(dp_cr);
cairo_surface_write_to_png(surf, fName.c_str());
};
} // EO namespace RDKit
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