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//
// Copyright (C) 2020-2022 David Cosgrove and other RDKit contributors
//
// @@ 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).
//
#include <GraphMol/MolDraw2D/DrawTextFTCairo.h>
namespace RDKit {
namespace MolDraw2D_detail {
// ****************************************************************************
DrawTextFTCairo::DrawTextFTCairo(double max_fnt_sz, double min_fnt_sz,
const std::string &font_file, cairo_t *dp_cr)
: DrawTextFT(max_fnt_sz, min_fnt_sz, font_file), dp_cr_(dp_cr) {}
void DrawTextFTCairo::setCairoContext(cairo_t *cr) { dp_cr_ = cr; }
// ****************************************************************************
double DrawTextFTCairo::extractOutline() {
cairo_set_source_rgba(dp_cr_, colour().r, colour().g, colour().b, colour().a);
double adv = DrawTextFT::extractOutline();
cairo_fill(dp_cr_);
return adv;
}
// ****************************************************************************
int DrawTextFTCairo::MoveToFunctionImpl(const FT_Vector *to) {
double dx, dy;
fontPosToDrawPos(to->x, to->y, dx, dy);
cairo_move_to(dp_cr_, dx, dy);
return 0;
}
// ****************************************************************************
int DrawTextFTCairo::LineToFunctionImpl(const FT_Vector *to) {
double dx, dy;
fontPosToDrawPos(to->x, to->y, dx, dy);
cairo_line_to(dp_cr_, dx, dy);
return 0;
}
// ****************************************************************************
int DrawTextFTCairo::ConicToFunctionImpl(const FT_Vector *control,
const FT_Vector *to) {
// Cairo doesn't have a quadratic bezier function, we need to promote
// it to a cubic using formula from
// https://lists.cairographics.org/archives/cairo/2010-April/019691.html
// and correcting the typo on the last line.
double x0, y0;
cairo_get_current_point(dp_cr_, &x0, &y0);
double x1, y1;
fontPosToDrawPos(control->x, control->y, x1, y1);
double x2, y2;
fontPosToDrawPos(to->x, to->y, x2, y2);
cairo_curve_to(dp_cr_, (2.0 / 3.0) * x1 + (1.0 / 3.0) * x0,
(2.0 / 3.0) * y1 + (1.0 / 3.0) * y0,
(2.0 / 3.0) * x1 + (1.0 / 3.0) * x2,
(2.0 / 3.0) * y1 + (1.0 / 3.0) * y2, x2, y2);
return 0;
}
// ****************************************************************************
int DrawTextFTCairo::CubicToFunctionImpl(const FT_Vector *controlOne,
const FT_Vector *controlTwo,
const FT_Vector *to) {
double controlOneX, controlOneY;
fontPosToDrawPos(controlOne->x, controlOne->y, controlOneX, controlOneY);
double controlTwoX, controlTwoY;
fontPosToDrawPos(controlTwo->x, controlTwo->y, controlTwoX, controlTwoY);
double dx, dy;
fontPosToDrawPos(to->x, to->y, dx, dy);
cairo_curve_to(dp_cr_, controlOneX, controlOneY, controlTwoX, controlTwoY, dx,
dy);
return 0;
}
} // namespace MolDraw2D_detail
} // namespace RDKit
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