#ifndef SEEN_SNAPPEDLINE_H #define SEEN_SNAPPEDLINE_H /** * \file src/snapped-line.h * \brief SnappedLine class. * * Authors: * Diederik van Lierop <mail@diedenrezi.nl> * * Released under GNU GPL, read the file 'COPYING' for more information. */ #include <vector> #include <list> #include "libnr/nr-coord.h" #include "libnr/nr-point.h" #include <libnr/nr-point-fns.h> #include "snapped-point.h" namespace Inkscape { /// Class describing the result of an attempt to snap to a line segment. 00025 class SnappedLineSegment : public SnappedPoint { public: SnappedLineSegment(); SnappedLineSegment(NR::Point snapped_point, NR::Coord snapped_distance, NR::Coord snapped_tolerance, bool always_snap, NR::Point start_point_of_line, NR::Point end_point_of_line); ~SnappedLineSegment(); Inkscape::SnappedPoint intersect(SnappedLineSegment const &line) const; //intersect with another SnappedLineSegment private: NR::Point _start_point_of_line; NR::Point _end_point_of_line; }; /// Class describing the result of an attempt to snap to a line. 00040 class SnappedLine : public SnappedPoint { public: SnappedLine(); SnappedLine(NR::Point snapped_point, NR::Coord snapped_distance, NR::Coord snapped_tolerance, bool always_snap, NR::Point normal_to_line, NR::Point point_on_line); ~SnappedLine(); Inkscape::SnappedPoint intersect(SnappedLine const &line) const; //intersect with another SnappedLine // 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 getClosestSLS(std::list<Inkscape::SnappedLineSegment> &list, Inkscape::SnappedLineSegment &result); bool getClosestIntersectionSLS(std::list<Inkscape::SnappedLineSegment> &list, Inkscape::SnappedPoint &result); bool getClosestSL(std::list<Inkscape::SnappedLine> &list, Inkscape::SnappedLine &result); bool getClosestIntersectionSL(std::list<Inkscape::SnappedLine> &list, Inkscape::SnappedPoint &result); bool getClosestIntersectionSL(std::list<Inkscape::SnappedLine> &list1, std::list<Inkscape::SnappedLine> &list2, Inkscape::SnappedPoint &result); #endif /* !SEEN_SNAPPEDLINE_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 :