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>
22 #include <2geom/angle.h>
24 namespace Inkscape {
25 namespace LivePathEffect {
27 namespace CR {
29 class KnotHolderEntityAngle : public LPEKnotHolderEntity
30 {
31 public:
32 virtual void knot_set(NR::Point const &p, NR::Point const &origin, guint state);
33 virtual NR::Point knot_get();
34 };
36 } // namespace CR
38 LPECopyRotate::LPECopyRotate(LivePathEffectObject *lpeobject) :
39 Effect(lpeobject),
40 angle(_("Angle"), _("Angle"), "angle", &wr, this, 30.0),
41 num_copies(_("Number of copies"), _("Number of copies of the original path"), "num_copies", &wr, this, 1),
42 origin(_("Origin"), _("Origin of the rotation"), "origin", &wr, this, "Adjust the origin of the rotation"),
43 include_original(_("Include original?"), _(""), "include_original", &wr, this, true),
44 dist_angle_handle(100)
45 {
46 show_orig_path = true;
48 // register all your parameters here, so Inkscape knows which parameters this effect has:
49 registerParameter( dynamic_cast<Parameter *>(&include_original) );
50 registerParameter( dynamic_cast<Parameter *>(&angle) );
51 registerParameter( dynamic_cast<Parameter *>(&num_copies) );
52 registerParameter( dynamic_cast<Parameter *>(&origin) );
54 registerKnotHolderHandle(new CR::KnotHolderEntityAngle(), _("Adjust the angle"));
56 num_copies.param_make_integer(true);
57 num_copies.param_set_range(0, 1000);
59 }
61 LPECopyRotate::~LPECopyRotate()
62 {
64 }
66 void
67 LPECopyRotate::doOnApply(SPLPEItem *lpeitem)
68 {
69 SPCurve *curve = SP_SHAPE(lpeitem)->curve;
71 A = curve->first_point();
72 B = curve->last_point();
74 origin.param_setValue(A);
76 dir = unit_vector(B - A);
77 dist_angle_handle = L2(B - A);
78 }
80 Geom::Piecewise<Geom::D2<Geom::SBasis> >
81 LPECopyRotate::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in)
82 {
83 using namespace Geom;
85 A = pwd2_in.firstValue();
86 B = pwd2_in.lastValue();
87 dir = unit_vector(B - A);
89 Piecewise<D2<SBasis> > output;
91 if (include_original) {
92 output = pwd2_in;
93 }
95 for (int i = 1; i <= num_copies; ++i) {
96 // I first suspected the minus sign to be a bug in 2geom but it is
97 // likely due to SVG's choice of coordinate system orientation (max)
98 Rotate rot(-deg_to_rad(angle * i));
99 Matrix t = Translate(-origin) * rot * Translate(origin);
100 output.concat(pwd2_in * t);
101 }
103 return output;
104 }
106 namespace CR {
108 using namespace Geom;
110 // TODO: make this more generic
111 static LPECopyRotate *
112 get_effect(SPItem *item)
113 {
114 Effect *effect = sp_lpe_item_get_current_lpe(SP_LPE_ITEM(item));
115 if (effect->effectType() != COPY_ROTATE) {
116 g_print ("Warning: Effect is not of type LPECopyRotate!\n");
117 return NULL;
118 }
119 return static_cast<LPECopyRotate *>(effect);
120 }
122 void
123 KnotHolderEntityAngle::knot_set(NR::Point const &p, NR::Point const &/*origin*/, guint state)
124 {
125 LPECopyRotate* lpe = get_effect(item);
127 NR::Point const s = snap_knot_position(p);
129 // I first suspected the minus sign to be a bug in 2geom but it is
130 // likely due to SVG's choice of coordinate system orientation (max)
131 lpe->angle.param_set_value(rad_to_deg(-angle_between(lpe->dir, s.to_2geom() - lpe->origin)));
132 if (state & GDK_SHIFT_MASK) {
133 lpe->dist_angle_handle = L2(lpe->B - lpe->A);
134 } else {
135 lpe->dist_angle_handle = L2(p - lpe->origin);
136 }
138 // FIXME: this should not directly ask for updating the item. It should write to SVG, which triggers updating.
139 sp_lpe_item_update_patheffect (SP_LPE_ITEM(item), false, true);
140 }
142 NR::Point
143 KnotHolderEntityAngle::knot_get()
144 {
145 LPECopyRotate* lpe = get_effect(item);
146 // I first suspected the minus sign to be a bug in 2geom but it is
147 // likely due to SVG's choice of coordinate system orientation (max)
148 Point d = lpe->dir * Rotate(-deg_to_rad(lpe->angle)) * lpe->dist_angle_handle;
150 return snap_knot_position(lpe->origin + d);
151 }
153 } // namespace CR
155 /* ######################## */
157 } //namespace LivePathEffect
158 } /* namespace Inkscape */
160 /*
161 Local Variables:
162 mode:c++
163 c-file-style:"stroustrup"
164 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
165 indent-tabs-mode:nil
166 fill-column:99
167 End:
168 */
169 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :