1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
|
#define INKSCAPE_LPE_BSPLINE_C
/*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include "live_effects/lpe-bspline.h"
#include "display/curve.h"
#include <typeinfo>
#include <2geom/pathvector.h>
#include <2geom/affine.h>
#include <2geom/bezier-curve.h>
#include "helper/geom-curves.h"
// For handling un-continuous paths:
#include "message-stack.h"
#include "inkscape.h"
#include "desktop.h"
namespace Inkscape {
namespace LivePathEffect {
LPEBSpline::LPEBSpline(LivePathEffectObject *lpeobject) :
Effect(lpeobject)
{
}
LPEBSpline::~LPEBSpline()
{
}
void
LPEBSpline::doEffect(SPCurve * curve)
{
using Geom::X;
using Geom::Y;
if(curve->get_segment_count() < 2)
return;
// Make copy of old path as it is changed during processing
Geom::PathVector const original_pathv = curve->get_pathvector();
curve->reset();
//Sbasis
Geom::D2< Geom::SBasis > SBasisIn;
Geom::D2< Geom::SBasis > SBasisOut;
Geom::D2< Geom::SBasis > SBasisEnd;
Geom::D2< Geom::SBasis > SBasisHelper;
//Curvas temporales
SPCurve *lineHelper = new SPCurve();
SPCurve *curveHelper = new SPCurve();
SPCurve *nCurve = new SPCurve();
//curves
SPCurve * in = new SPCurve();
SPCurve * out = new SPCurve();
SPCurve * end = new SPCurve();
//Puntos a usar. Ponemos todos los posibles para hacer más inteligible el código
Geom::Point startNode(0,0);
Geom::Point previousNode(0,0);
Geom::Point node(0,0);
//Geom::Point previousPointAt3(0,0);
Geom::Point pointAt0(0,0);
Geom::Point pointAt1(0,0);
Geom::Point pointAt2(0,0);
Geom::Point pointAt3(0,0);
//Geom::Point nextPointAt0(0,0);
Geom::Point nextPointAt1(0,0);
Geom::Point nextPointAt2(0,0);
Geom::Point nextPointAt3(0,0);
Geom::CubicBezier const *cubicIn;
Geom::CubicBezier const *cubicOut;
Geom::CubicBezier const *cubicEnd;
//Recorremos todos los paths a los que queremos aplicar el efecto, hasta el penúltimo
for(Geom::PathVector::const_iterator path_it = original_pathv.begin(); path_it != original_pathv.end(); ++path_it) {
//Si está vacío...
if (path_it->empty())
continue;
//Itreadores
Geom::Path::const_iterator curve_it1 = path_it->begin(); // incoming curve
Geom::Path::const_iterator curve_it2 = ++(path_it->begin()); // outgoing curve
Geom::Path::const_iterator curve_end = path_it->end(); // end curve
Geom::Path::const_iterator curve_endit = path_it->end_default(); // this determines when the loop has to stop
//Creamos las lineas rectas que unen todos los puntos del trazado y donde se calcularán
//los puntos clave para los manejadores.
//Esto hace que la curva BSpline no pierda su condición aunque se trasladen
//dichos manejadores
in->moveto(curve_it1->initialPoint());
in->lineto(curve_it1->finalPoint());
out->moveto(curve_it2->initialPoint());
out->lineto(curve_it2->finalPoint());
//este no cambia.
end->moveto(curve_end->initialPoint());
end->lineto(curve_end->finalPoint());
//Si la curva está cerrada calculamos el punto donde
//deveria estar el nodo BSpline de cierre/inicio de la curva
//en posible caso de que se cierre con una linea recta creando un nodo BSPline
cubicIn = dynamic_cast<Geom::CubicBezier const*>(&*curve_it1);
cubicOut = dynamic_cast<Geom::CubicBezier const*>(&*curve_it2);
cubicEnd = dynamic_cast<Geom::CubicBezier const*>(&*curve_end);
if (path_it->closed() && cubicIn && cubicEnd && (*cubicIn)[1] != (*cubicEnd)[2]){
//Calculamos el nodo de inicio BSpline
SBasisIn = in->first_segment()->toSBasis();
SBasisEnd = end->first_segment()->toSBasis();
lineHelper->moveto(SBasisIn.valueAt(Geom::nearest_point((*cubicIn)[1],*in->first_segment())));
lineHelper->lineto(SBasisEnd.valueAt(Geom::nearest_point((*cubicEnd)[2],*end->first_segment())));
SBasisHelper = lineHelper->first_segment()->toSBasis();
lineHelper->reset();
//Guardamos el principio de la curva
startNode = SBasisHelper.valueAt(0.5);
//Definimos el punto de inicio original de la curva resultante
node = startNode;
}else{
startNode = in->first_segment()->initialPoint();
node = startNode;
}
//Recorremos todos los segmentos menos el último
while ( curve_it2 != curve_endit )
{
SBasisIn = in->first_segment()->toSBasis();
SBasisOut = out->first_segment()->toSBasis();
//previousPointAt3 = pointAt3;
//Calculamos los puntos que dividirían en tres segmentos iguales el path recto de entrada y de salida
if(cubicIn){
pointAt0 = SBasisIn.valueAt(0);
pointAt1 = SBasisIn.valueAt(Geom::nearest_point((*cubicIn)[1],*in->first_segment()));
pointAt2 = SBasisIn.valueAt(Geom::nearest_point((*cubicIn)[2],*in->first_segment()));
pointAt3 = SBasisIn.valueAt(1);
}else{
pointAt0 = SBasisIn.valueAt(0);
pointAt1 = SBasisIn.valueAt(0);
pointAt2 = SBasisIn.valueAt(1);
pointAt3 = SBasisIn.valueAt(1);
}
//Y hacemos lo propio con el path de salida
//nextPointAt0 = curveOut.valueAt(0);
if(cubicOut){
nextPointAt1 = SBasisOut.valueAt(Geom::nearest_point((*cubicOut)[1],*out->first_segment()));
nextPointAt2 = SBasisOut.valueAt(Geom::nearest_point((*cubicOut)[2],*out->first_segment()));
nextPointAt3 = SBasisOut.valueAt(1);
}else{
nextPointAt1 = SBasisOut.valueAt(0);
nextPointAt2 = SBasisOut.valueAt(1);
nextPointAt3 = SBasisOut.valueAt(1);
}
//La curva BSpline se forma calculando el centro del segmanto de unión
//de el punto situado en las 2/3 partes de el segmento de entrada
//con el punto situado en la posición 1/3 del segmento de salida
//Estos dos puntos ademas estan posicionados en el lugas correspondiente de
//los manejadores de la curva
if(nextPointAt1 != pointAt2){
lineHelper->moveto(pointAt2);
lineHelper->lineto(nextPointAt1);
SBasisHelper = lineHelper->first_segment()->toSBasis();
lineHelper->reset();
//almacenamos el punto del anterior bucle -o el de cierre- que nos hara de principio de curva
previousNode = node;
//Y este hará de final de curva
node = SBasisHelper.valueAt(0.5);
}else{
previousNode = node;
//Y este hará de final de curva
node = nextPointAt1;
}
curveHelper->moveto(previousNode);
curveHelper->curveto(pointAt1, pointAt2, node);
//añadimos la curva generada a la curva pricipal
nCurve->append_continuous(curveHelper, 0.0625);
curveHelper->reset();
//aumentamos los valores para el siguiente paso en el bucle
++curve_it1;
++curve_it2;
//Damos valor a el objeto para el path de entrada y el de salida
in->reset();
in->moveto(curve_it1->initialPoint());
in->lineto(curve_it1->finalPoint());
out->reset();
if(curve_it1 != curve_end){
out->moveto(curve_it2->initialPoint());
out->lineto(curve_it2->finalPoint());
cubicOut = dynamic_cast<Geom::CubicBezier const*>(&*curve_it2);
}
cubicIn = dynamic_cast<Geom::CubicBezier const*>(&*curve_it1);
}
//Aberiguamos la ultima parte de la curva correspondiente al último segmento
curveHelper->moveto(node);
//Si está cerrada la curva, la cerramos sobre el valor guardado previamente
//Si no finalizamos en el punto final
if (path_it->closed()) {
curveHelper->curveto(nextPointAt1, nextPointAt2, startNode);
}else{
curveHelper->curveto(nextPointAt1, nextPointAt2, nextPointAt3);
}
//añadimos este último segmento
nCurve->append_continuous(curveHelper, 0.0625);
//y cerramos la curva
if (path_it->closed()) {
nCurve->closepath_current();
}
curve->append(nCurve,false);
nCurve->reset();
//Limpiamos
in->reset();
out->reset();
end->reset();
lineHelper->reset();
curveHelper->reset();
}
delete in;
delete out;
delete end;
delete lineHelper;
delete curveHelper;
//Todo: remove?
//delete SBasisHelper;
}
}; //namespace LivePathEffect
}; /* namespace Inkscape */
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
|
