X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=src%2Fline-geometry.h;h=472478e3b908620505309eb503f989bb28b3ec9d;hb=5e30445e52018eb5e4a05e97716a86ebcc82c573;hp=72e0ae794afcba9655ed633c761fcf6bae10cccc;hpb=a320e0fbc2a3815248a5b77eafea91c83c3c3c11;p=inkscape.git

diff --git a/src/line-geometry.h b/src/line-geometry.h
index 72e0ae794..472478e3b 100644
--- a/src/line-geometry.h
+++ b/src/line-geometry.h
@@ -12,12 +12,10 @@
 #ifndef SEEN_LINE_GEOMETRY_H
 #define SEEN_LINE_GEOMETRY_H
 
-#include "libnr/nr-point.h"
-#include "libnr/nr-point-fns.h"
-#include "libnr/nr-maybe.h"
+#include <boost/optional.hpp>
 #include "glib.h"
 #include "display/sp-ctrlline.h"
-#include "vanishing-point.h"
+#include "axis-manip.h" // FIXME: This is only for Box3D::epsilon; move that to a better location
 
 #include "document.h"
 #include "ui/view/view.h"
@@ -26,49 +24,57 @@ namespace Box3D {
 
 class Line {
 public:
-    Line(NR::Point const &start, NR::Point const &vec, bool is_endpoint = true);
+    Line(Geom::Point const &start, Geom::Point const &vec, bool is_endpoint = true);
     Line(Line const &line);
     virtual ~Line() {}
     Line &operator=(Line const &line);
-    virtual NR::Maybe<NR::Point> intersect(Line const &line);
-    void set_direction(NR::Point const &dir); // FIXME: Can we avoid this explicit assignment?
+    virtual boost::optional<Geom::Point> intersect(Line const &line);
+    inline Geom::Point direction () { return v_dir; }
     
-    NR::Point closest_to(NR::Point const &pt); // returns the point on the line closest to pt 
+    Geom::Point closest_to(Geom::Point const &pt); // returns the point on the line closest to pt 
 
     friend inline std::ostream &operator<< (std::ostream &out_file, const Line &in_line);
-    friend NR::Point fourth_pt_with_given_cross_ratio (NR::Point const &A, NR::Point const &C, NR::Point const &D, double gamma);
+    boost::optional<Geom::Point> intersection_with_viewbox (SPDesktop *desktop);
+    inline bool lie_on_same_side (Geom::Point const &A, Geom::Point const &B) {
+        /* If A is a point in the plane and n is the normal vector of the line then
+           the sign of dot(A, n) specifies the half-plane in which A lies.
+           Thus A and B lie on the same side if the dot products have equal sign. */
+        return ((Geom::dot(A, normal) - d0) * (Geom::dot(B, normal) - d0)) > 0;
+    }
 
-    double lambda (NR::Point const pt);
-    inline NR::Point point_from_lambda (double const lambda) { 
-        return (pt + lambda * NR::unit_vector (v_dir)); }
+    double lambda (Geom::Point const pt);
+    inline Geom::Point point_from_lambda (double const lambda) { 
+        return (pt + lambda * Geom::unit_vector (v_dir)); }
 
 protected:
-    inline static bool pts_coincide (NR::Point const pt1, NR::Point const pt2)
+    void set_direction(Geom::Point const &dir);
+    inline static bool pts_coincide (Geom::Point const pt1, Geom::Point const pt2)
     {
-        return (NR::L2 (pt2 - pt1) < epsilon);
+        return (Geom::L2 (pt2 - pt1) < epsilon);
     }
 
-    NR::Point pt;
-    NR::Point v_dir;
-    NR::Point normal;
-    NR::Coord d0;
+    Geom::Point pt;
+    Geom::Point v_dir;
+    Geom::Point normal;
+    Geom::Coord d0;
 };
 
-std::pair<double, double> coordinates (NR::Point const &v1, NR::Point const &v2, NR::Point const &w);
-bool lies_in_sector (NR::Point const &v1, NR::Point const &v2, NR::Point const &w);
-std::pair<NR::Point, NR::Point> side_of_intersection (NR::Point const &A, NR::Point const &B,
-                                                      NR::Point const &C, NR::Point const &D,
-                                                      NR::Point const &pt, NR::Point const &dir);
-
-double cross_ratio (NR::Point const &A, NR::Point const &B, NR::Point const &C, NR::Point const &D);
-double cross_ratio (VanishingPoint const &V, NR::Point const &B, NR::Point const &C, NR::Point const &D);
-NR::Point fourth_pt_with_given_cross_ratio (NR::Point const &A, NR::Point const &C, NR::Point const &D, double gamma);
-
-/*** For testing purposes: Draw a knot/node of specified size and color at the given position ***/
-void create_canvas_point(NR::Point const &pos, double size = 4.0, guint32 rgba = 0xff00007f);
-
-/*** For testing purposes: Draw a line between the specified points ***/
-void create_canvas_line(NR::Point const &p1, NR::Point const &p2, guint32 rgba = 0xff00007f);
+inline double determinant (Geom::Point const &a, Geom::Point const &b)
+{
+    return (a[Geom::X] * b[Geom::Y] - a[Geom::Y] * b[Geom::X]);
+}
+std::pair<double, double> coordinates (Geom::Point const &v1, Geom::Point const &v2, Geom::Point const &w);
+bool lies_in_sector (Geom::Point const &v1, Geom::Point const &v2, Geom::Point const &w);
+bool lies_in_quadrangle (Geom::Point const &A, Geom::Point const &B, Geom::Point const &C, Geom::Point const &D, Geom::Point const &pt);
+std::pair<Geom::Point, Geom::Point> side_of_intersection (Geom::Point const &A, Geom::Point const &B,
+                                                          Geom::Point const &C, Geom::Point const &D,
+                                                          Geom::Point const &pt, Geom::Point const &dir);
+
+/*** For debugging purposes: Draw a knot/node of specified size and color at the given position ***/
+void create_canvas_point(Geom::Point const &pos, double size = 4.0, guint32 rgba = 0xff00007f);
+
+/*** For debugging purposes: Draw a line between the specified points ***/
+void create_canvas_line(Geom::Point const &p1, Geom::Point const &p2, guint32 rgba = 0xff00007f);
 
 
 /** A function to print out the Line.  It just prints out the coordinates of start point and