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// SPDX-License-Identifier: GPL-2.0-or-later
#ifndef INKSCAPE_HELPER_PATH_STROKE_H
#define INKSCAPE_HELPER_PATH_STROKE_H
/* Authors:
* Liam P. White
* Tavmjong Bah
*
* Copyright (C) 2014-2015 Authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include <2geom/path.h>
#include <2geom/pathvector.h>
namespace Inkscape {
enum LineJoinType {
JOIN_BEVEL,
JOIN_ROUND,
JOIN_MITER,
JOIN_MITER_CLIP,
JOIN_EXTRAPOLATE,
JOIN_EXTRAPOLATE1,
JOIN_EXTRAPOLATE2,
JOIN_EXTRAPOLATE3,
};
enum LineCapType {
BUTT_FLAT,
BUTT_ROUND,
BUTT_SQUARE,
BUTT_PEAK, // This is not a line ending supported by the SVG standard.
};
/**
* Strokes the path given by @a input.
* Joins may behave oddly if the width is negative.
*
* @param[in] input Input path.
* @param[in] width Stroke width.
* @param[in] miter Miter limit. Only used when @a join is one of JOIN_MITER, JOIN_MITER_CLIP, and JOIN_EXTRAPOLATE.
* @param[in] join Line join type used during offset. Member of LineJoinType enum.
* @param[in] cap Line cap type used during stroking. Member of LineCapType enum.
* @param[in] tolerance Tolerance, values smaller than 0 lead to automatic tolerance depending on width.
*
* @return Stroked path.
* If the input path is closed, the resultant vector will contain two paths.
* Otherwise, there should be only one in the output.
*/
Geom::PathVector outline(
Geom::Path const& input,
double width,
double miter,
LineJoinType join = JOIN_BEVEL,
LineCapType cap = BUTT_FLAT,
double tolerance = -1);
/**
* Offset the input path by @a width.
* Joins may behave oddly if the width is negative.
*
* @param[in] input Input path.
* @param[in] width Amount to offset.
* @param[in] miter Miter limit. Only used when @a join is one of JOIN_MITER, JOIN_MITER_CLIP, and JOIN_EXTRAPOLATE.
* @param[in] join Line join type used during offset. Member of LineJoinType enum.
* @param[in] tolerance Tolerance, values smaller than 0 lead to automatic tolerance depending on width.
*
* @return Offsetted output.
*/
Geom::Path half_outline(
Geom::Path const& input,
double width,
double miter,
LineJoinType join = JOIN_BEVEL,
double tolerance = -1);
/**
* Builds a join on the provided path.
* Joins may behave oddly if the width is negative.
*
* @param[inout] res The path to build the join on.
* The outgoing path (or a portion thereof) will be appended after the join is created.
* Previous segments may be modified as an optimization, beware!
*
* @param[in] outgoing The segment to append on the outgoing portion of the join.
* @param[in] in_tang The end tangent to consider on the input path.
* @param[in] out_tang The begin tangent to consider on the output path.
* @param[in] width
* @param[in] miter
* @param[in] join
*/
void outline_join(Geom::Path &res, Geom::Path const& outgoing, Geom::Point in_tang, Geom::Point out_tang, double width, double miter, LineJoinType join);
} // namespace Inkscape
#endif // INKSCAPE_HELPER_PATH_STROKE_H
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8 :
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