1 #define INKSCAPE_LPE_RULER_CPP
3 /** \file
4 * LPE <ruler> implementation, see lpe-ruler.cpp.
5 */
7 /*
8 * Authors:
9 * Maximilian Albert
10 * Johan Engelen
11 *
12 * Copyright (C) Maximilian Albert 2008 <maximilian.albert@gmail.com>
13 *
14 * Released under GNU GPL, read the file 'COPYING' for more information
15 */
17 #include "live_effects/lpe-ruler.h"
18 #include <2geom/piecewise.h>
19 #include "inkscape.h"
20 #include "desktop.h"
22 namespace Inkscape {
23 namespace LivePathEffect {
25 LPERuler::LPERuler(LivePathEffectObject *lpeobject) :
26 Effect(lpeobject),
27 mark_distance(_("Mark distance"), _("Distance between ruler marks"), "mark_distance", &wr, this, 20),
28 mark_length(_("Mark length"), _("Length of ruler marks"), "mark_length", &wr, this, 10),
29 scale(_("Scale factor"), _("Scale factor for ruler distance (only affects on-canvas display of ruler length)"), "scale", &wr, this, 1.0),
30 info_text(this),
31 unit(_("Unit"), _("Unit"), "unit", &wr, this)
32 {
33 registerParameter(dynamic_cast<Parameter *>(&mark_distance));
34 registerParameter(dynamic_cast<Parameter *>(&mark_length));
35 registerParameter(dynamic_cast<Parameter *>(&scale));
36 registerParameter(dynamic_cast<Parameter *>(&info_text));
37 registerParameter(dynamic_cast<Parameter *>(&unit));
39 mark_distance.param_make_integer();
40 mark_length.param_make_integer();
41 }
43 LPERuler::~LPERuler()
44 {
46 }
48 enum MarkType {
49 RULER_MARK_BORDER,
50 RULER_MARK_MAJOR,
51 RULER_MARK_MINOR
52 };
54 static Geom::Piecewise<Geom::D2<Geom::SBasis> >
55 ruler_mark(Geom::Point A, Geom::Point n, MarkType marktype)
56 {
57 using namespace Geom;
59 Point C, D;
60 switch (marktype) {
61 case RULER_MARK_BORDER:
62 C = A - 1.5 * n;
63 D = A + 1.5 * n;
64 break;
65 case RULER_MARK_MAJOR:
66 C = A;
67 D = A + 1.5 * n;
68 break;
69 case RULER_MARK_MINOR:
70 C = A;
71 D = A + n;
72 break;
73 }
75 Piecewise<D2<SBasis> > seg(D2<SBasis>(Linear(C[X], D[X]), Linear(C[Y], D[Y])));
76 return seg;
77 }
79 Geom::Piecewise<Geom::D2<Geom::SBasis> >
80 LPERuler::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in)
81 {
82 using namespace Geom;
84 Point A(pwd2_in.firstValue());
85 Point B(pwd2_in.lastValue());
87 Piecewise<D2<SBasis> >output(D2<SBasis>(Linear(A[X], B[X]), Linear(A[Y], B[Y])));
89 Point dir(unit_vector(B - A));
90 Point n(-rot90(dir) * mark_length);
91 double length = L2(B - A);
93 /* convert the measured length to the correct unit ... */
94 double lengthval = length * scale;
95 gboolean success = sp_convert_distance(&lengthval, &sp_unit_get_by_id(SP_UNIT_PX), unit);
97 /* ... set it as the canvas text ... */
98 gchar *dist = g_strdup_printf("%.2f %s", lengthval, success ? unit.get_abbreviation() : "px");
99 info_text.param_setValue(dist);
100 g_free(dist);
102 /* ... and adjust the text's position on canvas */
103 double angle = Geom::angle_between(dir, Geom::Point(1,0));
104 info_text.setPos((A + B) / 2 + 2.0 * n);
105 info_text.setAnchor(std::sin(angle), -std::cos(angle));
107 /* draw the actual ruler */
108 Point C, D;
109 C = A - n;
110 D = A + n;
111 output.concat (ruler_mark(A, n, RULER_MARK_BORDER));
112 int j = 0;
113 for (double i = 0; i < length; i += mark_distance, ++j) {
114 if ((j % 5) == 0) {
115 output.concat (ruler_mark(A + dir * i, n, RULER_MARK_MAJOR));
116 } else {
117 output.concat (ruler_mark(A + dir * i, n, RULER_MARK_MINOR));
118 }
119 }
120 output.concat (ruler_mark(B, n, RULER_MARK_BORDER));
122 return output;
123 }
125 /* ######################## */
127 } //namespace LivePathEffect
128 } /* namespace Inkscape */
130 /*
131 Local Variables:
132 mode:c++
133 c-file-style:"stroustrup"
134 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
135 indent-tabs-mode:nil
136 fill-column:99
137 End:
138 */
139 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :