1 #define INKSCAPE_LPE_COPY_ROTATE_CPP
2 /** \file
3 * LPE <copy_rotate> implementation
4 */
5 /*
6 * Authors:
7 * Maximilian Albert
8 *
9 * Copyright (C) Johan Engelen 2007 <j.b.c.engelen@utwente.nl>
10 * Copyright (C) Maximilian Albert 2008 <maximilian.albert@gmail.com>
11 *
12 * Released under GNU GPL, read the file 'COPYING' for more information
13 */
15 #include "live_effects/lpe-copy_rotate.h"
16 #include "sp-shape.h"
17 #include "display/curve.h"
19 #include <2geom/path.h>
20 #include <2geom/transforms.h>
21 #include <2geom/d2-sbasis.h>
23 namespace Inkscape {
24 namespace LivePathEffect {
26 namespace CR {
28 class KnotHolderEntityAngle : public KnotHolderEntity
29 {
30 public:
31 virtual bool isLPEParam() { return true; }
33 virtual void knot_set(NR::Point const &p, NR::Point const &origin, guint state);
34 virtual NR::Point knot_get();
35 };
37 } // namespace CR
39 LPECopyRotate::LPECopyRotate(LivePathEffectObject *lpeobject) :
40 Effect(lpeobject),
41 angle(_("Angle"), _("Angle"), "angle", &wr, this, 30.0),
42 num_copies(_("Number of copies"), _("Number of copies of the original path"), "num_copies", &wr, this, 1),
43 origin(_("Origin"), _("Origin of the rotation"), "origin", &wr, this, "Adjust the origin of the rotation"),
44 include_original(_("Include original?"), _(""), "include_original", &wr, this, true),
45 dist_angle_handle(100)
46 {
47 show_orig_path = true;
49 // register all your parameters here, so Inkscape knows which parameters this effect has:
50 registerParameter( dynamic_cast<Parameter *>(&include_original) );
51 registerParameter( dynamic_cast<Parameter *>(&angle) );
52 registerParameter( dynamic_cast<Parameter *>(&num_copies) );
53 registerParameter( dynamic_cast<Parameter *>(&origin) );
55 registerKnotHolderHandle(new CR::KnotHolderEntityAngle(), _("Adjust the angle"));
57 num_copies.param_make_integer(true);
58 num_copies.param_set_range(0, 1000);
60 }
62 LPECopyRotate::~LPECopyRotate()
63 {
65 }
67 void
68 LPECopyRotate::doOnApply(SPLPEItem *lpeitem)
69 {
70 SPCurve *curve = SP_SHAPE(lpeitem)->curve;
72 A = curve->first_point().to_2geom();
73 B = curve->last_point().to_2geom();
75 origin.param_setValue(A);
77 dir = unit_vector(B - A);
78 dist_angle_handle = L2(B - A);
79 }
81 Geom::Piecewise<Geom::D2<Geom::SBasis> >
82 LPECopyRotate::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in)
83 {
84 using namespace Geom;
86 A = pwd2_in.firstValue();
87 B = pwd2_in.lastValue();
88 dir = unit_vector(B - A);
90 Piecewise<D2<SBasis> > output;
92 if (include_original) {
93 output = pwd2_in;
94 }
96 for (int i = 1; i <= num_copies; ++i) {
97 Rotate rot(deg_to_rad(angle * i));
98 Matrix t = Translate(-origin) * rot * Translate(origin);
99 output.concat(pwd2_in * t);
100 }
102 return output;
103 }
105 namespace CR {
107 using namespace Geom;
109 // TODO: make this more generic
110 static LPECopyRotate *
111 get_effect(SPItem *item)
112 {
113 Effect *effect = sp_lpe_item_get_current_lpe(SP_LPE_ITEM(item));
114 if (effect->effectType() != COPY_ROTATE) {
115 g_print ("Warning: Effect is not of type LPECopyRotate!\n");
116 return NULL;
117 }
118 return static_cast<LPECopyRotate *>(effect);
119 }
121 void
122 KnotHolderEntityAngle::knot_set(NR::Point const &p, NR::Point const &/*origin*/, guint state)
123 {
124 LPECopyRotate* lpe = get_effect(item);
126 // FIXME: is the minus sign due to a bug in 2geom?
127 lpe->angle.param_set_value(rad_to_deg(-angle_between(lpe->dir, p.to_2geom() - lpe->origin)));
128 if (state & GDK_SHIFT_MASK) {
129 lpe->dist_angle_handle = L2(lpe->B - lpe->A);
130 } else {
131 lpe->dist_angle_handle = L2(p - lpe->origin);
132 }
134 // FIXME: this should not directly ask for updating the item. It should write to SVG, which triggers updating.
135 sp_lpe_item_update_patheffect (SP_LPE_ITEM(item), false, true);
136 }
138 NR::Point
139 KnotHolderEntityAngle::knot_get()
140 {
141 LPECopyRotate* lpe = get_effect(item);
143 // FIXME: is the minus sign due to a bug in 2geom?
144 Point d = lpe->dir * Rotate(-deg_to_rad(lpe->angle)) * lpe->dist_angle_handle;
146 return lpe->origin + d;
147 }
149 } // namespace CR
151 /* ######################## */
153 } //namespace LivePathEffect
154 } /* namespace Inkscape */
156 /*
157 Local Variables:
158 mode:c++
159 c-file-style:"stroustrup"
160 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
161 indent-tabs-mode:nil
162 fill-column:99
163 End:
164 */
165 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :