5ecf2ffa29f74a74a276fe2b96cfd70b43092367
1 #define INKSCAPE_LPE_PATH_LENGTH_CPP
2 /** \file
3 * LPE <path_length> implementation.
4 */
5 /*
6 * Authors:
7 * Maximilian Albert <maximilian.albert@gmail.com>
8 * Johan Engelen
9 *
10 * Copyright (C) 2007-2008 Authors
11 *
12 * Released under GNU GPL, read the file 'COPYING' for more information
13 */
15 #include "live_effects/lpe-path_length.h"
16 #include "sp-metrics.h"
18 #include "2geom/sbasis-geometric.h"
20 namespace Inkscape {
21 namespace LivePathEffect {
23 LPEPathLength::LPEPathLength(LivePathEffectObject *lpeobject) :
24 Effect(lpeobject),
25 info_text(this),
26 unit(_("Unit"), _("Unit"), "unit", &wr, this)
27 {
28 registerParameter(dynamic_cast<Parameter *>(&info_text));
29 registerParameter(dynamic_cast<Parameter *>(&unit));
30 }
32 LPEPathLength::~LPEPathLength()
33 {
35 }
37 bool
38 LPEPathLength::hideCanvasText() {
39 // this is only used in sp-lpe-item.cpp to hide the canvas text when the effect is invisible
40 info_text.param_setValue("");
41 }
43 Geom::Piecewise<Geom::D2<Geom::SBasis> >
44 LPEPathLength::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in)
45 {
46 using namespace Geom;
48 /* convert the measured length to the correct unit ... */
49 double lengthval = Geom::length(pwd2_in);
50 gboolean success = sp_convert_distance(&lengthval, &sp_unit_get_by_id(SP_UNIT_PX), unit);
52 /* ... set it as the canvas text ... */
53 gchar *arc_length = g_strdup_printf("%.2f %s", lengthval, success ? unit.get_abbreviation() : "px");
54 info_text.param_setValue(arc_length);
55 g_free(arc_length);
57 info_text.setPosAndAnchor(pwd2_in, 0.5, 10);
59 // TODO: how can we compute the area (such that cw turns don't count negative)?
60 // should we display the area here, too, or write a new LPE for this?
61 Piecewise<D2<SBasis> > A = integral(pwd2_in);
62 Point c;
63 double area;
64 if (centroid(pwd2_in, c, area)) {
65 //g_print ("Area is zero\n");
66 }
67 //g_print ("Area: %f\n", area);
69 return pwd2_in;
70 }
72 } //namespace LivePathEffect
73 } /* namespace Inkscape */
75 /*
76 Local Variables:
77 mode:c++
78 c-file-style:"stroustrup"
79 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
80 indent-tabs-mode:nil
81 fill-column:99
82 End:
83 */
84 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :