snapped-line.h revision ce5ed3e99d287e1df46a818cd31753d8cbb301f0
0N/A#ifndef SEEN_SNAPPEDLINE_H
0N/A#define SEEN_SNAPPEDLINE_H
0N/A
0N/A/**
0N/A * \file src/snapped-line.h
0N/A * \brief SnappedInfiniteLine class.
0N/A *
0N/A * Authors:
0N/A * Diederik van Lierop <mail@diedenrezi.nl>
0N/A *
0N/A * Released under GNU GPL, read the file 'COPYING' for more information.
0N/A */
0N/A
0N/A#include <vector>
0N/A#include <list>
0N/A#include "libnr/nr-coord.h"
0N/A#include "libnr/nr-point.h"
0N/A#include <libnr/nr-point-fns.h>
0N/A#include "snapped-point.h"
namespace Inkscape
{
/// Class describing the result of an attempt to snap to a line segment.
class SnappedLine : public SnappedPoint
{
public:
SnappedLine();
SnappedLine(NR::Point snapped_point, NR::Coord snapped_distance, NR::Point start_point_of_line, NR::Point end_point_of_line);
~SnappedLine();
Inkscape::SnappedPoint intersect(SnappedLine const &line) const; //intersect with another SnappedLine
private:
NR::Point _start_point_of_line;
NR::Point _end_point_of_line;
};
/// Class describing the result of an attempt to snap to an infinite line.
class SnappedInfiniteLine : public SnappedPoint
{
public:
SnappedInfiniteLine();
SnappedInfiniteLine(NR::Point snapped_point, NR::Coord snapped_distance, NR::Point normal_to_line, NR::Point point_on_line);
~SnappedInfiniteLine();
Inkscape::SnappedPoint intersect(SnappedInfiniteLine const &line) const; //intersect with another SnappedInfiniteLine
// This line is described by this equation:
// a*x + b*y = c <-> nx*px + ny+py = c <-> n.p = c
NR::Point getNormal() const {return _normal_to_line;} // n = (nx, ny)
NR::Point getPointOnLine() const {return _point_on_line;} // p = (px, py)
NR::Coord getConstTerm() const {return dot(_normal_to_line, _point_on_line);} // c = n.p = nx*px + ny*py;
private:
NR::Point _normal_to_line;
NR::Point _point_on_line;
};
}
bool getClosestSIL(std::list<Inkscape::SnappedInfiniteLine> &list, Inkscape::SnappedInfiniteLine &result);
bool getClosestIntersectionSIL(std::list<Inkscape::SnappedInfiniteLine> &list, Inkscape::SnappedPoint &result);
bool getClosestIntersectionSIL(std::list<Inkscape::SnappedInfiniteLine> &list1, std::list<Inkscape::SnappedInfiniteLine> &list2, Inkscape::SnappedPoint &result);
#endif /* !SEEN_SNAPPEDLINE_H */
/*
Local Variables:
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c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
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