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91 lines
3.0 KiB
C++
91 lines
3.0 KiB
C++
//
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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: David Cosgrove (CozChemIx) on 08/05/2020.
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//
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#include <GraphMol/MolDraw2D/DrawTextFTCairo.h>
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namespace RDKit {
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// ****************************************************************************
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DrawTextFTCairo::DrawTextFTCairo(double max_fnt_sz, double min_fnt_sz,
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const std::string &font_file, cairo_t *dp_cr)
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: DrawTextFT(max_fnt_sz, min_fnt_sz, font_file), dp_cr_(dp_cr) {}
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// ****************************************************************************
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double DrawTextFTCairo::extractOutline() {
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cairo_set_source_rgb(dp_cr_, colour().r, colour().g, colour().b);
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double adv = DrawTextFT::extractOutline();
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cairo_fill(dp_cr_);
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return adv;
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}
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// ****************************************************************************
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int DrawTextFTCairo::MoveToFunctionImpl(const FT_Vector *to) {
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double dx, dy;
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fontPosToDrawPos(to->x, to->y, dx, dy);
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cairo_move_to(dp_cr_, dx, dy);
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return 0;
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}
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// ****************************************************************************
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int DrawTextFTCairo::LineToFunctionImpl(const FT_Vector *to) {
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double dx, dy;
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fontPosToDrawPos(to->x, to->y, dx, dy);
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cairo_line_to(dp_cr_, dx, dy);
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return 0;
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}
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// ****************************************************************************
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int DrawTextFTCairo::ConicToFunctionImpl(const FT_Vector *control,
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const FT_Vector *to) {
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// Cairo doesn't have a quadratic bezier function, we need to promote
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// it to a cubic using formula from
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// https://lists.cairographics.org/archives/cairo/2010-April/019691.html
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// and correcting the typo on the last line.
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double x0, y0;
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cairo_get_current_point(dp_cr_, &x0, &y0);
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double x1, y1;
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fontPosToDrawPos(control->x, control->y, x1, y1);
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double x2, y2;
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fontPosToDrawPos(to->x, to->y, x2, y2);
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cairo_curve_to(dp_cr_, (2.0 / 3.0) * x1 + (1.0 / 3.0) * x0,
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(2.0 / 3.0) * y1 + (1.0 / 3.0) * y0,
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(2.0 / 3.0) * x1 + (1.0 / 3.0) * x2,
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(2.0 / 3.0) * y1 + (1.0 / 3.0) * y2, x2, y2);
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return 0;
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}
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// ****************************************************************************
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int DrawTextFTCairo::CubicToFunctionImpl(const FT_Vector *controlOne,
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const FT_Vector *controlTwo,
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const FT_Vector *to) {
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double controlOneX, controlOneY;
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fontPosToDrawPos(controlOne->x, controlOne->y, controlOneX, controlOneY);
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double controlTwoX, controlTwoY;
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fontPosToDrawPos(controlTwo->x, controlTwo->y, controlTwoX, controlTwoY);
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double dx, dy;
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fontPosToDrawPos(to->x, to->y, dx, dy);
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cairo_curve_to(dp_cr_, controlOneX, controlOneY, controlTwoX, controlTwoY, dx,
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dy);
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return 0;
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}
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} // namespace RDKit
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