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
|
#define INKSCAPE_LPE_SPIRO_C
/*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include "live_effects/lpe-spiro.h"
#include "display/curve.h"
#include <libnr/n-art-bpath.h>
#include "nodepath.h"
#include "live_effects/bezctx.h"
#include "live_effects/bezctx_intf.h"
#include "live_effects/spiro.h"
// For handling un-continuous paths:
#include <2geom/pathvector.h>
#include <2geom/matrix.h>
#include "message-stack.h"
#include "inkscape.h"
#include "desktop.h"
typedef struct {
bezctx base;
SPCurve *curve;
int is_open;
} bezctx_ink;
void bezctx_ink_moveto(bezctx *bc, double x, double y, int /*is_open*/)
{
bezctx_ink *bi = (bezctx_ink *) bc;
bi->curve->moveto(x, y);
}
void bezctx_ink_lineto(bezctx *bc, double x, double y)
{
bezctx_ink *bi = (bezctx_ink *) bc;
bi->curve->lineto(x, y);
}
void bezctx_ink_quadto(bezctx *bc, double xm, double ym, double x3, double y3)
{
bezctx_ink *bi = (bezctx_ink *) bc;
double x0, y0;
double x1, y1;
double x2, y2;
NR::Point last = bi->curve->last_point();
x0 = last[NR::X];
y0 = last[NR::Y];
x1 = xm + (1./3) * (x0 - xm);
y1 = ym + (1./3) * (y0 - ym);
x2 = xm + (1./3) * (x3 - xm);
y2 = ym + (1./3) * (y3 - ym);
bi->curve->curveto(x1, y1, x2, y2, x3, y3);
}
void bezctx_ink_curveto(bezctx *bc, double x1, double y1, double x2, double y2,
double x3, double y3)
{
bezctx_ink *bi = (bezctx_ink *) bc;
bi->curve->curveto(x1, y1, x2, y2, x3, y3);
}
bezctx *
new_bezctx_ink(SPCurve *curve) {
bezctx_ink *result = g_new(bezctx_ink, 1);
result->base.moveto = bezctx_ink_moveto;
result->base.lineto = bezctx_ink_lineto;
result->base.quadto = bezctx_ink_quadto;
result->base.curveto = bezctx_ink_curveto;
result->base.mark_knot = NULL;
result->curve = curve;
return &result->base;
}
namespace Inkscape {
namespace LivePathEffect {
LPESpiro::LPESpiro(LivePathEffectObject *lpeobject) :
Effect(lpeobject)
{
}
LPESpiro::~LPESpiro()
{
}
void
LPESpiro::setup_nodepath(Inkscape::NodePath::Path *np)
{
sp_nodepath_show_handles(np, false);
// sp_nodepath_show_helperpath(np, false);
}
void
LPESpiro::doEffect(SPCurve * curve)
{
Geom::PathVector original_pathv = curve->get_pathvector();
SPCurve *csrc = curve->copy();
curve->reset();
bezctx *bc = new_bezctx_ink(curve);
int len = SP_CURVE_LENGTH(csrc);
spiro_cp *path = g_new (spiro_cp, len + 1);
NArtBpath const *bpath = csrc->get_bpath();
int ib = 0;
int ip = 0;
bool closed = false;
NR::Point pt(0, 0);
NArtBpath const *first_in_subpath = NULL;
while(ib <= len) {
path [ip].x = bpath[ib].x3;
path [ip].y = bpath[ib].y3;
// std::cout << "==" << bpath[ib].code << " ip" << ip << " ib" << ib << "\n";
if (bpath[ib].code == NR_END || bpath[ib].code == NR_MOVETO_OPEN || bpath[ib].code == NR_MOVETO) {
if (ip != 0) { // run prev subpath
int sp_len = 0;
if (!closed) {
path[ip - 1].ty = '}';
sp_len = ip;
} else {
sp_len = ip - 1;
}
spiro_seg *s = NULL;
//for (int j = 0; j <= sp_len; j ++) printf ("%c\n", path[j].ty);
s = run_spiro(path, sp_len);
spiro_to_bpath(s, sp_len, bc);
free(s);
path[0].x = path[ip].x;
path[0].y = path[ip].y;
ip = 0;
}
if (bpath[ib].code == NR_MOVETO_OPEN) {
closed = false;
path[ip].ty = '{';
} else {
closed = true;
if (ib < len)
first_in_subpath = &(bpath[ib + 1]);
path[ip].ty = 'c';
}
} else {
// this point is not last, so makes sense to find a proper type for it
NArtBpath const *next = NULL;
if (ib < len && (bpath[ib+1].code == NR_END || bpath[ib+1].code == NR_MOVETO_OPEN || bpath[ib+1].code == NR_MOVETO)) { // end of subpath
if (closed)
next = first_in_subpath;
} else {
if (ib < len)
next = &(bpath[ib+1]);
else if (closed)
next = first_in_subpath;
}
if (next) {
bool this_is_line = bpath[ib].code == NR_LINETO ||
(NR::L2(NR::Point(bpath[ib].x3, bpath[ib].y3) - NR::Point(bpath[ib].x2, bpath[ib].y2)) < 1e-6);
bool next_is_line = next->code == NR_LINETO ||
(NR::L2(NR::Point(bpath[ib].x3, bpath[ib].y3) - NR::Point(next->x1, next->y1)) < 1e-6);
NR::Point this_angle (0, 0);
if (this_is_line) {
this_angle = NR::Point (bpath[ib].x3 - pt[NR::X], bpath[ib].y3 - pt[NR::Y]);
} else if (bpath[ib].code == NR_CURVETO) {
this_angle = NR::Point (bpath[ib].x3 - bpath[ib].x2, bpath[ib].y3 - bpath[ib].y2);
}
NR::Point next_angle (0, 0);
if (next_is_line) {
next_angle = NR::Point (next->x3 - bpath[ib].x3, next->y3 - bpath[ib].y3);
} else if (next->code == NR_CURVETO) {
next_angle = NR::Point (next->x1 - bpath[ib].x3, next->y1 - bpath[ib].y3);
}
double this_angle_L2 = NR::L2(this_angle);
double next_angle_L2 = NR::L2(next_angle);
double both_angles_L2 = NR::L2(this_angle + next_angle);
if (this_angle_L2 > 1e-6 &&
next_angle_L2 > 1e-6 &&
this_angle_L2 + next_angle_L2 - both_angles_L2 < 1e-3) {
if (this_is_line && !next_is_line) {
path[ip].ty = ']';
} else if (next_is_line && !this_is_line) {
path[ip].ty = '[';
} else {
path[ip].ty = 'c';
}
} else {
path[ip].ty = 'v';
}
if (closed && next == first_in_subpath) {
path[0].ty = path[ip].ty;
}
}
}
pt = NR::Point(bpath[ib].x3, bpath[ib].y3);
ip++;
ib++;
}
g_free (path);
// FIXME: refactor the spiro code such that it cannot generate non-continous paths!
// sometimes, the code above generates a path that is not continuous. if so, undo the effect by resetting the original path.
try {
curve->get_pathvector() * Geom::identity(); // tests for continuity, this makes LPE Spiro slower of course :-(
}
catch (Geom::ContinuityError & e) {
g_warning("Exception during LPE Spiro execution. \n %s", e.what());
SP_ACTIVE_DESKTOP->messageStack()->flash( Inkscape::WARNING_MESSAGE,
_("An exception occurred during execution of the Spiro Path Effect.") );
curve->set_pathvector(original_pathv);
}
}
}; //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 :
|
