9574d2cad0daf3db717fd2b936925dd18923855d
1 #define __SP_DYNA_DRAW_CONTEXT_C__
3 /*
4 * Handwriting-like drawing mode
5 *
6 * Authors:
7 * Mitsuru Oka <oka326@parkcity.ne.jp>
8 * Lauris Kaplinski <lauris@kaplinski.com>
9 * bulia byak <buliabyak@users.sf.net>
10 * MenTaLguY <mental@rydia.net>
11 *
12 * The original dynadraw code:
13 * Paul Haeberli <paul@sgi.com>
14 *
15 * Copyright (C) 1998 The Free Software Foundation
16 * Copyright (C) 1999-2005 authors
17 * Copyright (C) 2001-2002 Ximian, Inc.
18 * Copyright (C) 2005-2007 bulia byak
19 * Copyright (C) 2006 MenTaLguY
20 *
21 * Released under GNU GPL, read the file 'COPYING' for more information
22 */
24 #define noDYNA_DRAW_VERBOSE
26 #include "config.h"
28 #include <gtk/gtk.h>
29 #include <gdk/gdkkeysyms.h>
30 #include <glibmm/i18n.h>
31 #include <string>
32 #include <cstring>
33 #include <numeric>
35 #include "svg/svg.h"
36 #include "display/canvas-bpath.h"
37 #include "display/bezier-utils.h"
38 #include "display/curve.h"
39 #include <glib/gmem.h>
40 #include "macros.h"
41 #include "document.h"
42 #include "selection.h"
43 #include "desktop.h"
44 #include "desktop-events.h"
45 #include "desktop-handles.h"
46 #include "desktop-affine.h"
47 #include "desktop-style.h"
48 #include "message-context.h"
49 #include "prefs-utils.h"
50 #include "pixmaps/cursor-calligraphy.xpm"
51 #include "libnr/n-art-bpath.h"
52 #include "libnr/nr-path.h"
53 #include "libnr/nr-matrix-ops.h"
54 #include "libnr/nr-scale-translate-ops.h"
55 #include "xml/repr.h"
56 #include "context-fns.h"
57 #include "sp-item.h"
58 #include "inkscape.h"
59 #include "color.h"
60 #include "splivarot.h"
61 #include "sp-item-group.h"
62 #include "sp-shape.h"
63 #include "sp-path.h"
64 #include "sp-text.h"
65 #include "display/canvas-bpath.h"
66 #include "display/canvas-arena.h"
67 #include "livarot/Shape.h"
68 #include "isnan.h"
70 #include "dyna-draw-context.h"
72 #define DDC_RED_RGBA 0xff0000ff
74 #define TOLERANCE_CALLIGRAPHIC 0.1
76 #define DYNA_EPSILON 0.5e-6
77 #define DYNA_EPSILON_START 0.5e-2
78 #define DYNA_VEL_START 1e-5
80 #define DYNA_MIN_WIDTH 1.0e-6
82 #define DRAG_MIN 0.0
83 #define DRAG_DEFAULT 1.0
84 #define DRAG_MAX 1.0
86 // FIXME: move it to some shared file to be reused by both calligraphy and dropper
87 #define C1 0.552
88 static NArtBpath const hatch_area_circle[] = {
89 { NR_MOVETO, 0, 0, 0, 0, -1, 0 },
90 { NR_CURVETO, -1, C1, -C1, 1, 0, 1 },
91 { NR_CURVETO, C1, 1, 1, C1, 1, 0 },
92 { NR_CURVETO, 1, -C1, C1, -1, 0, -1 },
93 { NR_CURVETO, -C1, -1, -1, -C1, -1, 0 },
94 { NR_END, 0, 0, 0, 0, 0, 0 }
95 };
96 #undef C1
99 static void sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass);
100 static void sp_dyna_draw_context_init(SPDynaDrawContext *ddc);
101 static void sp_dyna_draw_context_dispose(GObject *object);
103 static void sp_dyna_draw_context_setup(SPEventContext *ec);
104 static void sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
105 static gint sp_dyna_draw_context_root_handler(SPEventContext *ec, GdkEvent *event);
107 static void clear_current(SPDynaDrawContext *dc);
108 static void set_to_accumulated(SPDynaDrawContext *dc, bool unionize);
109 static void add_cap(SPCurve *curve, NR::Point const &pre, NR::Point const &from, NR::Point const &to, NR::Point const &post, double rounding);
110 static void accumulate_calligraphic(SPDynaDrawContext *dc);
112 static void fit_and_split(SPDynaDrawContext *ddc, gboolean release);
114 static void sp_dyna_draw_reset(SPDynaDrawContext *ddc, NR::Point p);
115 static NR::Point sp_dyna_draw_get_npoint(SPDynaDrawContext const *ddc, NR::Point v);
116 static NR::Point sp_dyna_draw_get_vpoint(SPDynaDrawContext const *ddc, NR::Point n);
117 static void draw_temporary_box(SPDynaDrawContext *dc);
120 static SPEventContextClass *parent_class;
122 GType sp_dyna_draw_context_get_type(void)
123 {
124 static GType type = 0;
125 if (!type) {
126 GTypeInfo info = {
127 sizeof(SPDynaDrawContextClass),
128 0, // base_init
129 0, // base_finalize
130 (GClassInitFunc)sp_dyna_draw_context_class_init,
131 0, // class_finalize
132 0, // class_data
133 sizeof(SPDynaDrawContext),
134 0, // n_preallocs
135 (GInstanceInitFunc)sp_dyna_draw_context_init,
136 0 // value_table
137 };
138 type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDynaDrawContext", &info, static_cast<GTypeFlags>(0));
139 }
140 return type;
141 }
143 static void
144 sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass)
145 {
146 GObjectClass *object_class = (GObjectClass *) klass;
147 SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
149 parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
151 object_class->dispose = sp_dyna_draw_context_dispose;
153 event_context_class->setup = sp_dyna_draw_context_setup;
154 event_context_class->set = sp_dyna_draw_context_set;
155 event_context_class->root_handler = sp_dyna_draw_context_root_handler;
156 }
158 static void
159 sp_dyna_draw_context_init(SPDynaDrawContext *ddc)
160 {
161 SPEventContext *event_context = SP_EVENT_CONTEXT(ddc);
163 event_context->cursor_shape = cursor_calligraphy_xpm;
164 event_context->hot_x = 4;
165 event_context->hot_y = 4;
167 ddc->accumulated = NULL;
168 ddc->segments = NULL;
169 ddc->currentcurve = NULL;
170 ddc->currentshape = NULL;
171 ddc->npoints = 0;
172 ddc->cal1 = NULL;
173 ddc->cal2 = NULL;
174 ddc->repr = NULL;
176 /* DynaDraw values */
177 ddc->cur = NR::Point(0,0);
178 ddc->last = NR::Point(0,0);
179 ddc->vel = NR::Point(0,0);
180 ddc->vel_max = 0;
181 ddc->acc = NR::Point(0,0);
182 ddc->ang = NR::Point(0,0);
183 ddc->del = NR::Point(0,0);
185 /* attributes */
186 ddc->dragging = FALSE;
188 ddc->mass = 0.3;
189 ddc->drag = DRAG_DEFAULT;
190 ddc->angle = 30.0;
191 ddc->width = 0.2;
192 ddc->pressure = DDC_DEFAULT_PRESSURE;
194 ddc->vel_thin = 0.1;
195 ddc->flatness = 0.9;
196 ddc->cap_rounding = 0.0;
198 ddc->abs_width = false;
199 ddc->keep_selected = true;
201 ddc->hatch_spacing = 0;
202 ddc->hatch_spacing_step = 0;
203 new (&ddc->hatch_pointer_past) std::list<double>();
204 new (&ddc->hatch_nearest_past) std::list<double>();
205 ddc->hatch_last_nearest = NR::Point(0,0);
206 ddc->hatch_last_pointer = NR::Point(0,0);
207 ddc->hatch_vector_accumulated = NR::Point(0,0);
208 ddc->hatch_escaped = false;
209 ddc->hatch_area = NULL;
210 ddc->hatch_item = NULL;
211 ddc->hatch_livarot_path = NULL;
213 ddc->trace_bg = false;
214 }
216 static void
217 sp_dyna_draw_context_dispose(GObject *object)
218 {
219 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(object);
221 if (ddc->hatch_area) {
222 gtk_object_destroy(GTK_OBJECT(ddc->hatch_area));
223 ddc->hatch_area = NULL;
224 }
226 if (ddc->accumulated) {
227 ddc->accumulated = ddc->accumulated->unref();
228 }
230 while (ddc->segments) {
231 gtk_object_destroy(GTK_OBJECT(ddc->segments->data));
232 ddc->segments = g_slist_remove(ddc->segments, ddc->segments->data);
233 }
235 if (ddc->currentcurve) ddc->currentcurve = ddc->currentcurve->unref();
236 if (ddc->cal1) ddc->cal1 = ddc->cal1->unref();
237 if (ddc->cal2) ddc->cal2 = ddc->cal2->unref();
239 if (ddc->currentshape) {
240 gtk_object_destroy(GTK_OBJECT(ddc->currentshape));
241 ddc->currentshape = NULL;
242 }
244 if (ddc->_message_context) {
245 delete ddc->_message_context;
246 }
248 G_OBJECT_CLASS(parent_class)->dispose(object);
250 ddc->hatch_pointer_past.~list();
251 ddc->hatch_nearest_past.~list();
252 }
254 static void
255 sp_dyna_draw_context_setup(SPEventContext *ec)
256 {
257 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
259 if (((SPEventContextClass *) parent_class)->setup)
260 ((SPEventContextClass *) parent_class)->setup(ec);
262 ddc->accumulated = new SPCurve(32);
263 ddc->currentcurve = new SPCurve(4);
265 ddc->cal1 = new SPCurve(32);
266 ddc->cal2 = new SPCurve(32);
268 ddc->currentshape = sp_canvas_item_new(sp_desktop_sketch(ec->desktop), SP_TYPE_CANVAS_BPATH, NULL);
269 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->currentshape), DDC_RED_RGBA, SP_WIND_RULE_EVENODD);
270 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->currentshape), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
271 /* fixme: Cannot we cascade it to root more clearly? */
272 g_signal_connect(G_OBJECT(ddc->currentshape), "event", G_CALLBACK(sp_desktop_root_handler), ec->desktop);
274 {
275 SPCurve *c = SPCurve::new_from_foreign_bpath(hatch_area_circle);
276 ddc->hatch_area = sp_canvas_bpath_new(sp_desktop_controls(ec->desktop), c);
277 c->unref();
278 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->hatch_area), 0x00000000,(SPWindRule)0);
279 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->hatch_area), 0x0000007f, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
280 sp_canvas_item_hide(ddc->hatch_area);
281 }
283 sp_event_context_read(ec, "mass");
284 sp_event_context_read(ec, "wiggle");
285 sp_event_context_read(ec, "angle");
286 sp_event_context_read(ec, "width");
287 sp_event_context_read(ec, "thinning");
288 sp_event_context_read(ec, "tremor");
289 sp_event_context_read(ec, "flatness");
290 sp_event_context_read(ec, "tracebackground");
291 sp_event_context_read(ec, "usepressure");
292 sp_event_context_read(ec, "usetilt");
293 sp_event_context_read(ec, "abs_width");
294 sp_event_context_read(ec, "keep_selected");
295 sp_event_context_read(ec, "cap_rounding");
297 ddc->is_drawing = false;
299 ddc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
301 if (prefs_get_int_attribute("tools.calligraphic", "selcue", 0) != 0) {
302 ec->enableSelectionCue();
303 }
304 }
306 static void
307 sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
308 {
309 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
311 if (!strcmp(key, "mass")) {
312 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.2 );
313 ddc->mass = CLAMP(dval, -1000.0, 1000.0);
314 } else if (!strcmp(key, "wiggle")) {
315 double const dval = ( val ? g_ascii_strtod (val, NULL) : (1 - DRAG_DEFAULT));
316 ddc->drag = CLAMP((1 - dval), DRAG_MIN, DRAG_MAX); // drag is inverse to wiggle
317 } else if (!strcmp(key, "angle")) {
318 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0);
319 ddc->angle = CLAMP (dval, -90, 90);
320 } else if (!strcmp(key, "width")) {
321 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
322 ddc->width = CLAMP(dval, -1000.0, 1000.0);
323 } else if (!strcmp(key, "thinning")) {
324 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
325 ddc->vel_thin = CLAMP(dval, -1.0, 1.0);
326 } else if (!strcmp(key, "tremor")) {
327 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0 );
328 ddc->tremor = CLAMP(dval, 0.0, 1.0);
329 } else if (!strcmp(key, "flatness")) {
330 double const dval = ( val ? g_ascii_strtod (val, NULL) : 1.0 );
331 ddc->flatness = CLAMP(dval, 0, 1.0);
332 } else if (!strcmp(key, "tracebackground")) {
333 ddc->trace_bg = (val && strcmp(val, "0"));
334 } else if (!strcmp(key, "usepressure")) {
335 ddc->usepressure = (val && strcmp(val, "0"));
336 } else if (!strcmp(key, "usetilt")) {
337 ddc->usetilt = (val && strcmp(val, "0"));
338 } else if (!strcmp(key, "abs_width")) {
339 ddc->abs_width = (val && strcmp(val, "0"));
340 } else if (!strcmp(key, "keep_selected")) {
341 ddc->keep_selected = (val && strcmp(val, "0"));
342 } else if (!strcmp(key, "cap_rounding")) {
343 ddc->cap_rounding = ( val ? g_ascii_strtod (val, NULL) : 0.0 );
344 }
346 //g_print("DDC: %g %g %g %g\n", ddc->mass, ddc->drag, ddc->angle, ddc->width);
347 }
349 static double
350 flerp(double f0, double f1, double p)
351 {
352 return f0 + ( f1 - f0 ) * p;
353 }
355 /* Get normalized point */
356 static NR::Point
357 sp_dyna_draw_get_npoint(SPDynaDrawContext const *dc, NR::Point v)
358 {
359 NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
360 double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
361 return NR::Point(( v[NR::X] - drect.min()[NR::X] ) / max, ( v[NR::Y] - drect.min()[NR::Y] ) / max);
362 }
364 /* Get view point */
365 static NR::Point
366 sp_dyna_draw_get_vpoint(SPDynaDrawContext const *dc, NR::Point n)
367 {
368 NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
369 double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
370 return NR::Point(n[NR::X] * max + drect.min()[NR::X], n[NR::Y] * max + drect.min()[NR::Y]);
371 }
373 static void
374 sp_dyna_draw_reset(SPDynaDrawContext *dc, NR::Point p)
375 {
376 dc->last = dc->cur = sp_dyna_draw_get_npoint(dc, p);
377 dc->vel = NR::Point(0,0);
378 dc->vel_max = 0;
379 dc->acc = NR::Point(0,0);
380 dc->ang = NR::Point(0,0);
381 dc->del = NR::Point(0,0);
382 }
384 static void
385 sp_dyna_draw_extinput(SPDynaDrawContext *dc, GdkEvent *event)
386 {
387 if (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &dc->pressure))
388 dc->pressure = CLAMP (dc->pressure, DDC_MIN_PRESSURE, DDC_MAX_PRESSURE);
389 else
390 dc->pressure = DDC_DEFAULT_PRESSURE;
392 if (gdk_event_get_axis (event, GDK_AXIS_XTILT, &dc->xtilt))
393 dc->xtilt = CLAMP (dc->xtilt, DDC_MIN_TILT, DDC_MAX_TILT);
394 else
395 dc->xtilt = DDC_DEFAULT_TILT;
397 if (gdk_event_get_axis (event, GDK_AXIS_YTILT, &dc->ytilt))
398 dc->ytilt = CLAMP (dc->ytilt, DDC_MIN_TILT, DDC_MAX_TILT);
399 else
400 dc->ytilt = DDC_DEFAULT_TILT;
401 }
404 static gboolean
405 sp_dyna_draw_apply(SPDynaDrawContext *dc, NR::Point p)
406 {
407 NR::Point n = sp_dyna_draw_get_npoint(dc, p);
409 /* Calculate mass and drag */
410 double const mass = flerp(1.0, 160.0, dc->mass);
411 double const drag = flerp(0.0, 0.5, dc->drag * dc->drag);
413 /* Calculate force and acceleration */
414 NR::Point force = n - dc->cur;
416 // If force is below the absolute threshold DYNA_EPSILON,
417 // or we haven't yet reached DYNA_VEL_START (i.e. at the beginning of stroke)
418 // _and_ the force is below the (higher) DYNA_EPSILON_START threshold,
419 // discard this move.
420 // This prevents flips, blobs, and jerks caused by microscopic tremor of the tablet pen,
421 // especially bothersome at the start of the stroke where we don't yet have the inertia to
422 // smooth them out.
423 if ( NR::L2(force) < DYNA_EPSILON || (dc->vel_max < DYNA_VEL_START && NR::L2(force) < DYNA_EPSILON_START)) {
424 return FALSE;
425 }
427 dc->acc = force / mass;
429 /* Calculate new velocity */
430 dc->vel += dc->acc;
432 if (NR::L2(dc->vel) > dc->vel_max)
433 dc->vel_max = NR::L2(dc->vel);
435 /* Calculate angle of drawing tool */
437 double a1;
438 if (dc->usetilt) {
439 // 1a. calculate nib angle from input device tilt:
440 gdouble length = std::sqrt(dc->xtilt*dc->xtilt + dc->ytilt*dc->ytilt);;
442 if (length > 0) {
443 NR::Point ang1 = NR::Point(dc->ytilt/length, dc->xtilt/length);
444 a1 = atan2(ang1);
445 }
446 else
447 a1 = 0.0;
448 }
449 else {
450 // 1b. fixed dc->angle (absolutely flat nib):
451 double const radians = ( (dc->angle - 90) / 180.0 ) * M_PI;
452 NR::Point ang1 = NR::Point(-sin(radians), cos(radians));
453 a1 = atan2(ang1);
454 }
456 // 2. perpendicular to dc->vel (absolutely non-flat nib):
457 gdouble const mag_vel = NR::L2(dc->vel);
458 if ( mag_vel < DYNA_EPSILON ) {
459 return FALSE;
460 }
461 NR::Point ang2 = NR::rot90(dc->vel) / mag_vel;
463 // 3. Average them using flatness parameter:
464 // calculate angles
465 double a2 = atan2(ang2);
466 // flip a2 to force it to be in the same half-circle as a1
467 bool flipped = false;
468 if (fabs (a2-a1) > 0.5*M_PI) {
469 a2 += M_PI;
470 flipped = true;
471 }
472 // normalize a2
473 if (a2 > M_PI)
474 a2 -= 2*M_PI;
475 if (a2 < -M_PI)
476 a2 += 2*M_PI;
477 // find the flatness-weighted bisector angle, unflip if a2 was flipped
478 // FIXME: when dc->vel is oscillating around the fixed angle, the new_ang flips back and forth. How to avoid this?
479 double new_ang = a1 + (1 - dc->flatness) * (a2 - a1) - (flipped? M_PI : 0);
481 // Try to detect a sudden flip when the new angle differs too much from the previous for the
482 // current velocity; in that case discard this move
483 double angle_delta = NR::L2(NR::Point (cos (new_ang), sin (new_ang)) - dc->ang);
484 if ( angle_delta / NR::L2(dc->vel) > 4000 ) {
485 return FALSE;
486 }
488 // convert to point
489 dc->ang = NR::Point (cos (new_ang), sin (new_ang));
491 // g_print ("force %g acc %g vel_max %g vel %g a1 %g a2 %g new_ang %g\n", NR::L2(force), NR::L2(dc->acc), dc->vel_max, NR::L2(dc->vel), a1, a2, new_ang);
493 /* Apply drag */
494 dc->vel *= 1.0 - drag;
496 /* Update position */
497 dc->last = dc->cur;
498 dc->cur += dc->vel;
500 return TRUE;
501 }
503 static void
504 sp_dyna_draw_brush(SPDynaDrawContext *dc)
505 {
506 g_assert( dc->npoints >= 0 && dc->npoints < SAMPLING_SIZE );
508 // How much velocity thins strokestyle
509 double vel_thin = flerp (0, 160, dc->vel_thin);
511 // Influence of pressure on thickness
512 double pressure_thick = (dc->usepressure ? dc->pressure : 1.0);
514 // get the real brush point, not the same as pointer (affected by hatch tracking and/or mass
515 // drag)
516 NR::Point brush = sp_dyna_draw_get_vpoint(dc, dc->cur);
517 NR::Point brush_w = SP_EVENT_CONTEXT(dc)->desktop->d2w(brush);
519 double trace_thick = 1;
520 if (dc->trace_bg) {
521 // pick single pixel
522 NRPixBlock pb;
523 int x = (int) floor(brush_w[NR::X]);
524 int y = (int) floor(brush_w[NR::Y]);
525 nr_pixblock_setup_fast(&pb, NR_PIXBLOCK_MODE_R8G8B8A8P, x, y, x+1, y+1, TRUE);
526 sp_canvas_arena_render_pixblock(SP_CANVAS_ARENA(sp_desktop_drawing(SP_EVENT_CONTEXT(dc)->desktop)), &pb);
527 const unsigned char *s = NR_PIXBLOCK_PX(&pb);
528 double R = s[0] / 255.0;
529 double G = s[1] / 255.0;
530 double B = s[2] / 255.0;
531 double A = s[3] / 255.0;
532 double max = MAX (MAX (R, G), B);
533 double min = MIN (MIN (R, G), B);
534 double L = A * (max + min)/2 + (1 - A); // blend with white bg
535 trace_thick = 1 - L;
536 //g_print ("L %g thick %g\n", L, trace_thick);
537 }
539 double width = (pressure_thick * trace_thick - vel_thin * NR::L2(dc->vel)) * dc->width;
541 double tremble_left = 0, tremble_right = 0;
542 if (dc->tremor > 0) {
543 // obtain two normally distributed random variables, using polar Box-Muller transform
544 double x1, x2, w, y1, y2;
545 do {
546 x1 = 2.0 * g_random_double_range(0,1) - 1.0;
547 x2 = 2.0 * g_random_double_range(0,1) - 1.0;
548 w = x1 * x1 + x2 * x2;
549 } while ( w >= 1.0 );
550 w = sqrt( (-2.0 * log( w ) ) / w );
551 y1 = x1 * w;
552 y2 = x2 * w;
554 // deflect both left and right edges randomly and independently, so that:
555 // (1) dc->tremor=1 corresponds to sigma=1, decreasing dc->tremor narrows the bell curve;
556 // (2) deflection depends on width, but is upped for small widths for better visual uniformity across widths;
557 // (3) deflection somewhat depends on speed, to prevent fast strokes looking
558 // comparatively smooth and slow ones excessively jittery
559 tremble_left = (y1)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
560 tremble_right = (y2)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
561 }
563 if ( width < 0.02 * dc->width ) {
564 width = 0.02 * dc->width;
565 }
567 double dezoomify_factor = 0.05 * 1000;
568 if (!dc->abs_width) {
569 dezoomify_factor /= SP_EVENT_CONTEXT(dc)->desktop->current_zoom();
570 }
572 NR::Point del_left = dezoomify_factor * (width + tremble_left) * dc->ang;
573 NR::Point del_right = dezoomify_factor * (width + tremble_right) * dc->ang;
575 dc->point1[dc->npoints] = brush + del_left;
576 dc->point2[dc->npoints] = brush - del_right;
578 dc->del = 0.5*(del_left + del_right);
580 dc->npoints++;
581 }
583 void
584 sp_ddc_update_toolbox (SPDesktop *desktop, const gchar *id, double value)
585 {
586 desktop->setToolboxAdjustmentValue (id, value);
587 }
589 static void
590 calligraphic_cancel(SPDynaDrawContext *dc)
591 {
592 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
593 dc->dragging = FALSE;
594 dc->is_drawing = false;
595 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), 0);
596 /* Remove all temporary line segments */
597 while (dc->segments) {
598 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
599 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
600 }
601 /* reset accumulated curve */
602 dc->accumulated->reset();
603 clear_current(dc);
604 if (dc->repr) {
605 dc->repr = NULL;
606 }
607 }
610 gint
611 sp_dyna_draw_context_root_handler(SPEventContext *event_context,
612 GdkEvent *event)
613 {
614 SPDynaDrawContext *dc = SP_DYNA_DRAW_CONTEXT(event_context);
615 SPDesktop *desktop = event_context->desktop;
617 gint ret = FALSE;
619 switch (event->type) {
620 case GDK_BUTTON_PRESS:
621 if (event->button.button == 1 && !event_context->space_panning) {
623 SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
625 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
626 return TRUE;
627 }
629 NR::Point const button_w(event->button.x,
630 event->button.y);
631 NR::Point const button_dt(desktop->w2d(button_w));
632 sp_dyna_draw_reset(dc, button_dt);
633 sp_dyna_draw_extinput(dc, event);
634 sp_dyna_draw_apply(dc, button_dt);
635 dc->accumulated->reset();
636 if (dc->repr) {
637 dc->repr = NULL;
638 }
640 /* initialize first point */
641 dc->npoints = 0;
643 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
644 ( GDK_KEY_PRESS_MASK |
645 GDK_BUTTON_RELEASE_MASK |
646 GDK_POINTER_MOTION_MASK |
647 GDK_BUTTON_PRESS_MASK ),
648 NULL,
649 event->button.time);
651 ret = TRUE;
653 sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 3);
654 dc->is_drawing = true;
655 }
656 break;
657 case GDK_MOTION_NOTIFY:
658 {
659 NR::Point const motion_w(event->motion.x,
660 event->motion.y);
661 NR::Point motion_dt(desktop->w2d(motion_w));
662 sp_dyna_draw_extinput(dc, event);
664 dc->_message_context->clear();
666 // for hatching:
667 double hatch_dist = 0;
668 NR::Point hatch_unit_vector(0,0);
669 NR::Point nearest(0,0);
670 NR::Point pointer(0,0);
671 NR::Matrix motion_to_curve(NR::identity());
673 if (event->motion.state & GDK_CONTROL_MASK) { // hatching - sense the item
675 SPItem *selected = sp_desktop_selection(desktop)->singleItem();
676 if (selected && (SP_IS_SHAPE(selected) || SP_IS_TEXT(selected))) {
677 // One item selected, and it's a path;
678 // let's try to track it as a guide
680 if (selected != dc->hatch_item) {
681 dc->hatch_item = selected;
682 if (dc->hatch_livarot_path)
683 delete dc->hatch_livarot_path;
684 dc->hatch_livarot_path = Path_for_item (dc->hatch_item, true, true);
685 dc->hatch_livarot_path->ConvertWithBackData(0.01);
686 }
688 // calculate pointer point in the guide item's coords
689 motion_to_curve = sp_item_dt2i_affine(selected) * sp_item_i2doc_affine(selected);
690 pointer = motion_dt * motion_to_curve;
692 // calculate the nearest point on the guide path
693 NR::Maybe<Path::cut_position> position = get_nearest_position_on_Path(dc->hatch_livarot_path, pointer);
694 nearest = get_point_on_Path(dc->hatch_livarot_path, position->piece, position->t);
697 // distance from pointer to nearest
698 hatch_dist = NR::L2(pointer - nearest);
699 // unit-length vector
700 hatch_unit_vector = (pointer - nearest)/hatch_dist;
702 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Guide path selected</b>; start drawing along the guide with <b>Ctrl</b>"));
703 } else {
704 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Select a guide path</b> to track with <b>Ctrl</b>"));
705 }
706 }
708 if ( dc->is_drawing && (event->motion.state & GDK_BUTTON1_MASK) && !event_context->space_panning) {
709 dc->dragging = TRUE;
711 if (event->motion.state & GDK_CONTROL_MASK && dc->hatch_item) { // hatching
713 #define SPEED_ELEMENTS 12
714 #define SPEED_MIN 0.12
715 #define SPEED_NORMAL 0.65
717 // speed is the movement of the nearest point along the guide path, divided by
718 // the movement of the pointer at the same period; it is averaged for the last
719 // SPEED_ELEMENTS motion events. Normally, as you track the guide path, speed
720 // is about 1, i.e. the nearest point on the path is moved by about the same
721 // distance as the pointer. If the speed starts to decrease, we are losing
722 // contact with the guide; if it drops below SPEED_MIN, we are on our own and
723 // not attracted to guide anymore. Most often this happens when you have
724 // tracked to the end of a guide calligraphic stroke and keep moving
725 // further. We try to handle this situation gracefully: not stick with the
726 // guide forever but let go of it smoothly and without sharp jerks (non-zero
727 // mass recommended; with zero mass, jerks are still quite noticeable).
729 double speed = 1;
730 if (NR::L2(dc->hatch_last_nearest) != 0) {
731 // the distance nearest moved since the last motion event
732 double nearest_moved = NR::L2(nearest - dc->hatch_last_nearest);
733 // the distance pointer moved since the last motion event
734 double pointer_moved = NR::L2(pointer - dc->hatch_last_pointer);
735 // store them in stacks limited to SPEED_ELEMENTS
736 dc->hatch_nearest_past.push_front(nearest_moved);
737 if (dc->hatch_nearest_past.size() > SPEED_ELEMENTS)
738 dc->hatch_nearest_past.pop_back();
739 dc->hatch_pointer_past.push_front(pointer_moved);
740 if (dc->hatch_pointer_past.size() > SPEED_ELEMENTS)
741 dc->hatch_pointer_past.pop_back();
743 // If the stacks are full,
744 if (dc->hatch_nearest_past.size() == SPEED_ELEMENTS) {
745 // calculate the sums of all stored movements
746 double nearest_sum = std::accumulate (dc->hatch_nearest_past.begin(), dc->hatch_nearest_past.end(), 0.0);
747 double pointer_sum = std::accumulate (dc->hatch_pointer_past.begin(), dc->hatch_pointer_past.end(), 0.0);
748 // and divide to get the speed
749 speed = nearest_sum/pointer_sum;
750 //g_print ("nearest sum %g pointer_sum %g speed %g\n", nearest_sum, pointer_sum, speed);
751 }
752 }
754 if ( dc->hatch_escaped // already escaped, do not reattach
755 || (speed < SPEED_MIN) // stuck; most likely reached end of traced stroke
756 || (dc->hatch_spacing > 0 && hatch_dist > 50 * dc->hatch_spacing) // went too far from the guide
757 ) {
758 // We are NOT attracted to the guide!
760 //g_print ("\nlast_nearest %g %g nearest %g %g pointer %g %g pos %d %g\n", dc->last_nearest[NR::X], dc->last_nearest[NR::Y], nearest[NR::X], nearest[NR::Y], pointer[NR::X], pointer[NR::Y], position->piece, position->t);
762 // Remember hatch_escaped so we don't get
763 // attracted again until the end of this stroke
764 dc->hatch_escaped = true;
766 } else {
768 // Calculate angle cosine of this vector-to-guide and all past vectors
769 // summed, to detect if we accidentally flipped to the other side of the
770 // guide
771 double dot = NR::dot (pointer - nearest, dc->hatch_vector_accumulated);
772 dot /= NR::L2(pointer - nearest) * NR::L2(dc->hatch_vector_accumulated);
774 if (dc->hatch_spacing != 0) { // spacing was already set
775 double target;
776 if (speed > SPEED_NORMAL) {
777 // all ok, strictly obey the spacing
778 target = dc->hatch_spacing;
779 } else {
780 // looks like we're starting to lose speed,
781 // so _gradually_ let go attraction to prevent jerks
782 target = (dc->hatch_spacing * speed + hatch_dist * (SPEED_NORMAL - speed))/SPEED_NORMAL;
783 }
784 if (!isNaN(dot) && dot < -0.5) {// flip
785 target = -target;
786 }
788 // This is the track pointer that we will use instead of the real one
789 NR::Point new_pointer = nearest + target * hatch_unit_vector;
791 // some limited feedback: allow persistent pulling to slightly change
792 // the spacing
793 dc->hatch_spacing += (hatch_dist - dc->hatch_spacing)/3500;
795 // return it to the desktop coords
796 motion_dt = new_pointer * motion_to_curve.inverse();
798 } else {
799 // this is the first motion event, set the dist
800 dc->hatch_spacing = hatch_dist;
801 }
803 // remember last points
804 dc->hatch_last_pointer = pointer;
805 dc->hatch_last_nearest = nearest;
806 dc->hatch_vector_accumulated += (pointer - nearest);
807 }
809 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, dc->hatch_escaped? _("Tracking: <b>connection to guide path lost!</b>") : _("<b>Tracking</b> a guide path"));
811 } else {
812 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Drawing</b> a calligraphic stroke"));
813 }
815 if (!sp_dyna_draw_apply(dc, motion_dt)) {
816 ret = TRUE;
817 break;
818 }
820 if ( dc->cur != dc->last ) {
821 sp_dyna_draw_brush(dc);
822 g_assert( dc->npoints > 0 );
823 fit_and_split(dc, FALSE);
824 }
825 ret = TRUE;
826 }
828 // Draw the hatching circle if necessary
829 if (event->motion.state & GDK_CONTROL_MASK) {
830 if (dc->hatch_spacing == 0 && hatch_dist != 0) {
831 // Haven't set spacing yet: gray, center free, update radius live
832 NR::Point c = desktop->w2d(motion_w);
833 NR::Matrix const sm (NR::scale(hatch_dist, hatch_dist) * NR::translate(c));
834 sp_canvas_item_affine_absolute(dc->hatch_area, sm);
835 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0x7f7f7fff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
836 sp_canvas_item_show(dc->hatch_area);
837 } else if (dc->dragging && !dc->hatch_escaped) {
838 // Tracking: green, center snapped, fixed radius
839 NR::Point c = motion_dt;
840 NR::Matrix const sm (NR::scale(dc->hatch_spacing, dc->hatch_spacing) * NR::translate(c));
841 sp_canvas_item_affine_absolute(dc->hatch_area, sm);
842 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0x00FF00ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
843 sp_canvas_item_show(dc->hatch_area);
844 } else if (dc->dragging && dc->hatch_escaped) {
845 // Tracking escaped: red, center free, fixed radius
846 NR::Point c = desktop->w2d(motion_w);
847 NR::Matrix const sm (NR::scale(dc->hatch_spacing, dc->hatch_spacing) * NR::translate(c));
849 sp_canvas_item_affine_absolute(dc->hatch_area, sm);
850 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0xFF0000ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
851 sp_canvas_item_show(dc->hatch_area);
852 } else {
853 // Not drawing but spacing set: gray, center snapped, fixed radius
854 NR::Point c = (nearest + dc->hatch_spacing * hatch_unit_vector) * motion_to_curve.inverse();
855 if (!isNaN(c[NR::X]) && !isNaN(c[NR::Y])) {
856 NR::Matrix const sm (NR::scale(dc->hatch_spacing, dc->hatch_spacing) * NR::translate(c));
857 sp_canvas_item_affine_absolute(dc->hatch_area, sm);
858 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0x7f7f7fff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
859 sp_canvas_item_show(dc->hatch_area);
860 }
861 }
862 } else {
863 sp_canvas_item_hide(dc->hatch_area);
864 }
865 }
866 break;
869 case GDK_BUTTON_RELEASE:
870 {
871 NR::Point const motion_w(event->button.x, event->button.y);
872 NR::Point const motion_dt(desktop->w2d(motion_w));
874 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
875 sp_canvas_end_forced_full_redraws(desktop->canvas);
876 dc->is_drawing = false;
878 if (dc->dragging && event->button.button == 1 && !event_context->space_panning) {
879 dc->dragging = FALSE;
881 sp_dyna_draw_apply(dc, motion_dt);
883 /* Remove all temporary line segments */
884 while (dc->segments) {
885 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
886 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
887 }
889 /* Create object */
890 fit_and_split(dc, TRUE);
891 accumulate_calligraphic(dc);
892 set_to_accumulated(dc, event->button.state & GDK_SHIFT_MASK); // performs document_done
894 /* reset accumulated curve */
895 dc->accumulated->reset();
897 clear_current(dc);
898 if (dc->repr) {
899 dc->repr = NULL;
900 }
902 if (!dc->hatch_pointer_past.empty()) dc->hatch_pointer_past.clear();
903 if (!dc->hatch_nearest_past.empty()) dc->hatch_nearest_past.clear();
904 dc->hatch_last_nearest = NR::Point(0,0);
905 dc->hatch_last_pointer = NR::Point(0,0);
906 dc->hatch_vector_accumulated = NR::Point(0,0);
907 dc->hatch_escaped = false;
908 dc->hatch_item = NULL;
909 dc->hatch_livarot_path = NULL;
911 if (dc->hatch_spacing != 0 && !dc->keep_selected) {
912 // we do not select the newly drawn path, so increase spacing by step
913 if (dc->hatch_spacing_step == 0) {
914 dc->hatch_spacing_step = dc->hatch_spacing;
915 }
916 dc->hatch_spacing += dc->hatch_spacing_step;
917 }
919 dc->_message_context->clear();
920 ret = TRUE;
921 }
922 break;
923 }
925 case GDK_KEY_PRESS:
926 switch (get_group0_keyval (&event->key)) {
927 case GDK_Up:
928 case GDK_KP_Up:
929 if (!MOD__CTRL_ONLY) {
930 dc->angle += 5.0;
931 if (dc->angle > 90.0)
932 dc->angle = 90.0;
933 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
934 ret = TRUE;
935 }
936 break;
937 case GDK_Down:
938 case GDK_KP_Down:
939 if (!MOD__CTRL_ONLY) {
940 dc->angle -= 5.0;
941 if (dc->angle < -90.0)
942 dc->angle = -90.0;
943 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
944 ret = TRUE;
945 }
946 break;
947 case GDK_Right:
948 case GDK_KP_Right:
949 if (!MOD__CTRL_ONLY) {
950 dc->width += 0.01;
951 if (dc->width > 1.0)
952 dc->width = 1.0;
953 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100); // the same spinbutton is for alt+x
954 ret = TRUE;
955 }
956 break;
957 case GDK_Left:
958 case GDK_KP_Left:
959 if (!MOD__CTRL_ONLY) {
960 dc->width -= 0.01;
961 if (dc->width < 0.01)
962 dc->width = 0.01;
963 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
964 ret = TRUE;
965 }
966 break;
967 case GDK_Home:
968 case GDK_KP_Home:
969 dc->width = 0.01;
970 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
971 ret = TRUE;
972 break;
973 case GDK_End:
974 case GDK_KP_End:
975 dc->width = 1.0;
976 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
977 ret = TRUE;
978 break;
979 case GDK_x:
980 case GDK_X:
981 if (MOD__ALT_ONLY) {
982 desktop->setToolboxFocusTo ("altx-calligraphy");
983 ret = TRUE;
984 }
985 break;
986 case GDK_Escape:
987 if (dc->is_drawing) {
988 // if drawing, cancel, otherwise pass it up for deselecting
989 calligraphic_cancel (dc);
990 ret = TRUE;
991 }
992 break;
993 case GDK_z:
994 case GDK_Z:
995 if (MOD__CTRL_ONLY && dc->is_drawing) {
996 // if drawing, cancel, otherwise pass it up for undo
997 calligraphic_cancel (dc);
998 ret = TRUE;
999 }
1000 break;
1001 default:
1002 break;
1003 }
1004 break;
1006 case GDK_KEY_RELEASE:
1007 switch (get_group0_keyval(&event->key)) {
1008 case GDK_Control_L:
1009 case GDK_Control_R:
1010 dc->_message_context->clear();
1011 dc->hatch_spacing = 0;
1012 dc->hatch_spacing_step = 0;
1013 break;
1014 default:
1015 break;
1016 }
1018 default:
1019 break;
1020 }
1022 if (!ret) {
1023 if (((SPEventContextClass *) parent_class)->root_handler) {
1024 ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
1025 }
1026 }
1028 return ret;
1029 }
1032 static void
1033 clear_current(SPDynaDrawContext *dc)
1034 {
1035 /* reset bpath */
1036 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), NULL);
1037 /* reset curve */
1038 dc->currentcurve->reset();
1039 dc->cal1->reset();
1040 dc->cal2->reset();
1041 /* reset points */
1042 dc->npoints = 0;
1043 }
1045 static void
1046 set_to_accumulated(SPDynaDrawContext *dc, bool unionize)
1047 {
1048 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
1050 if (!dc->accumulated->is_empty()) {
1051 NArtBpath *abp;
1052 gchar *str;
1054 if (!dc->repr) {
1055 /* Create object */
1056 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
1057 Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
1059 /* Set style */
1060 sp_desktop_apply_style_tool (desktop, repr, "tools.calligraphic", false);
1062 dc->repr = repr;
1064 SPItem *item=SP_ITEM(desktop->currentLayer()->appendChildRepr(dc->repr));
1065 Inkscape::GC::release(dc->repr);
1066 item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
1067 item->updateRepr();
1068 }
1069 abp = nr_artpath_affine(dc->accumulated->first_bpath(), sp_desktop_dt2root_affine(desktop));
1070 str = sp_svg_write_path(abp);
1071 g_assert( str != NULL );
1072 g_free(abp);
1073 dc->repr->setAttribute("d", str);
1074 g_free(str);
1076 if (unionize) {
1077 sp_desktop_selection(desktop)->add(dc->repr);
1078 sp_selected_path_union_skip_undo();
1079 } else {
1080 if (dc->keep_selected) {
1081 sp_desktop_selection(desktop)->set(dc->repr);
1082 }
1083 }
1085 } else {
1086 if (dc->repr) {
1087 sp_repr_unparent(dc->repr);
1088 }
1089 dc->repr = NULL;
1090 }
1092 sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_CALLIGRAPHIC,
1093 _("Draw calligraphic stroke"));
1094 }
1096 static void
1097 add_cap(SPCurve *curve,
1098 NR::Point const &pre, NR::Point const &from,
1099 NR::Point const &to, NR::Point const &post,
1100 double rounding)
1101 {
1102 NR::Point vel = rounding * NR::rot90( to - from ) / sqrt(2.0);
1103 double mag = NR::L2(vel);
1105 NR::Point v_in = from - pre;
1106 double mag_in = NR::L2(v_in);
1107 if ( mag_in > DYNA_EPSILON ) {
1108 v_in = mag * v_in / mag_in;
1109 } else {
1110 v_in = NR::Point(0, 0);
1111 }
1113 NR::Point v_out = to - post;
1114 double mag_out = NR::L2(v_out);
1115 if ( mag_out > DYNA_EPSILON ) {
1116 v_out = mag * v_out / mag_out;
1117 } else {
1118 v_out = NR::Point(0, 0);
1119 }
1121 if ( NR::L2(v_in) > DYNA_EPSILON || NR::L2(v_out) > DYNA_EPSILON ) {
1122 curve->curveto(from + v_in, to + v_out, to);
1123 }
1124 }
1126 static void
1127 accumulate_calligraphic(SPDynaDrawContext *dc)
1128 {
1129 if ( !dc->cal1->is_empty() && !dc->cal2->is_empty() ) {
1130 dc->accumulated->reset(); /* Is this required ?? */
1131 SPCurve *rev_cal2 = dc->cal2->create_reverse();
1133 g_assert(dc->cal1->_end > 1);
1134 g_assert(rev_cal2->_end > 1);
1135 g_assert(SP_CURVE_SEGMENT(dc->cal1, 0)->code == NR_MOVETO_OPEN);
1136 g_assert(SP_CURVE_SEGMENT(rev_cal2, 0)->code == NR_MOVETO_OPEN);
1137 g_assert(SP_CURVE_SEGMENT(dc->cal1, 1)->code == NR_CURVETO);
1138 g_assert(SP_CURVE_SEGMENT(rev_cal2, 1)->code == NR_CURVETO);
1139 g_assert(SP_CURVE_SEGMENT(dc->cal1, dc->cal1->_end-1)->code == NR_CURVETO);
1140 g_assert(SP_CURVE_SEGMENT(rev_cal2, rev_cal2->_end-1)->code == NR_CURVETO);
1142 dc->accumulated->append(dc->cal1, FALSE);
1144 add_cap(dc->accumulated, SP_CURVE_SEGMENT(dc->cal1, dc->cal1->_end-1)->c(2), SP_CURVE_SEGMENT(dc->cal1, dc->cal1->_end-1)->c(3), SP_CURVE_SEGMENT(rev_cal2, 0)->c(3), SP_CURVE_SEGMENT(rev_cal2, 1)->c(1), dc->cap_rounding);
1146 dc->accumulated->append(rev_cal2, TRUE);
1148 add_cap(dc->accumulated, SP_CURVE_SEGMENT(rev_cal2, rev_cal2->_end-1)->c(2), SP_CURVE_SEGMENT(rev_cal2, rev_cal2->_end-1)->c(3), SP_CURVE_SEGMENT(dc->cal1, 0)->c(3), SP_CURVE_SEGMENT(dc->cal1, 1)->c(1), dc->cap_rounding);
1150 dc->accumulated->closepath();
1152 rev_cal2->unref();
1154 dc->cal1->reset();
1155 dc->cal2->reset();
1156 }
1157 }
1159 static double square(double const x)
1160 {
1161 return x * x;
1162 }
1164 static void
1165 fit_and_split(SPDynaDrawContext *dc, gboolean release)
1166 {
1167 double const tolerance_sq = square( NR::expansion(SP_EVENT_CONTEXT(dc)->desktop->w2d()) * TOLERANCE_CALLIGRAPHIC );
1169 #ifdef DYNA_DRAW_VERBOSE
1170 g_print("[F&S:R=%c]", release?'T':'F');
1171 #endif
1173 if (!( dc->npoints > 0 && dc->npoints < SAMPLING_SIZE ))
1174 return; // just clicked
1176 if ( dc->npoints == SAMPLING_SIZE - 1 || release ) {
1177 #define BEZIER_SIZE 4
1178 #define BEZIER_MAX_BEZIERS 8
1179 #define BEZIER_MAX_LENGTH ( BEZIER_SIZE * BEZIER_MAX_BEZIERS )
1181 #ifdef DYNA_DRAW_VERBOSE
1182 g_print("[F&S:#] dc->npoints:%d, release:%s\n",
1183 dc->npoints, release ? "TRUE" : "FALSE");
1184 #endif
1186 /* Current calligraphic */
1187 if ( dc->cal1->_end == 0 || dc->cal2->_end == 0 ) {
1188 /* dc->npoints > 0 */
1189 /* g_print("calligraphics(1|2) reset\n"); */
1190 dc->cal1->reset();
1191 dc->cal2->reset();
1193 dc->cal1->moveto(dc->point1[0]);
1194 dc->cal2->moveto(dc->point2[0]);
1195 }
1197 NR::Point b1[BEZIER_MAX_LENGTH];
1198 gint const nb1 = sp_bezier_fit_cubic_r(b1, dc->point1, dc->npoints,
1199 tolerance_sq, BEZIER_MAX_BEZIERS);
1200 g_assert( nb1 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b1)) );
1202 NR::Point b2[BEZIER_MAX_LENGTH];
1203 gint const nb2 = sp_bezier_fit_cubic_r(b2, dc->point2, dc->npoints,
1204 tolerance_sq, BEZIER_MAX_BEZIERS);
1205 g_assert( nb2 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b2)) );
1207 if ( nb1 != -1 && nb2 != -1 ) {
1208 /* Fit and draw and reset state */
1209 #ifdef DYNA_DRAW_VERBOSE
1210 g_print("nb1:%d nb2:%d\n", nb1, nb2);
1211 #endif
1212 /* CanvasShape */
1213 if (! release) {
1214 dc->currentcurve->reset();
1215 dc->currentcurve->moveto(b1[0]);
1216 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
1217 dc->currentcurve->curveto(bp1[1],
1218 bp1[2], bp1[3]);
1219 }
1220 dc->currentcurve->lineto(b2[BEZIER_SIZE*(nb2-1) + 3]);
1221 for (NR::Point *bp2 = b2 + BEZIER_SIZE * ( nb2 - 1 ); bp2 >= b2; bp2 -= BEZIER_SIZE) {
1222 dc->currentcurve->curveto(bp2[2], bp2[1], bp2[0]);
1223 }
1224 // FIXME: dc->segments is always NULL at this point??
1225 if (!dc->segments) { // first segment
1226 add_cap(dc->currentcurve, b2[1], b2[0], b1[0], b1[1], dc->cap_rounding);
1227 }
1228 dc->currentcurve->closepath();
1229 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
1230 }
1232 /* Current calligraphic */
1233 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
1234 dc->cal1->curveto(bp1[1], bp1[2], bp1[3]);
1235 }
1236 for (NR::Point *bp2 = b2; bp2 < b2 + BEZIER_SIZE * nb2; bp2 += BEZIER_SIZE) {
1237 dc->cal2->curveto(bp2[1], bp2[2], bp2[3]);
1238 }
1239 } else {
1240 /* fixme: ??? */
1241 #ifdef DYNA_DRAW_VERBOSE
1242 g_print("[fit_and_split] failed to fit-cubic.\n");
1243 #endif
1244 draw_temporary_box(dc);
1246 for (gint i = 1; i < dc->npoints; i++) {
1247 dc->cal1->lineto(dc->point1[i]);
1248 }
1249 for (gint i = 1; i < dc->npoints; i++) {
1250 dc->cal2->lineto(dc->point2[i]);
1251 }
1252 }
1254 /* Fit and draw and copy last point */
1255 #ifdef DYNA_DRAW_VERBOSE
1256 g_print("[%d]Yup\n", dc->npoints);
1257 #endif
1258 if (!release) {
1259 g_assert(!dc->currentcurve->is_empty());
1261 SPCanvasItem *cbp = sp_canvas_item_new(sp_desktop_sketch(SP_EVENT_CONTEXT(dc)->desktop),
1262 SP_TYPE_CANVAS_BPATH,
1263 NULL);
1264 SPCurve *curve = dc->currentcurve->copy();
1265 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH (cbp), curve);
1266 curve->unref();
1268 guint32 fillColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", true);
1269 //guint32 strokeColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", false);
1270 double opacity = sp_desktop_get_master_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic");
1271 double fillOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", true);
1272 //double strokeOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", false);
1273 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cbp), ((fillColor & 0xffffff00) | SP_COLOR_F_TO_U(opacity*fillOpacity)), SP_WIND_RULE_EVENODD);
1274 //on second thougtht don't do stroke yet because we don't have stoke-width yet and because stoke appears between segments while drawing
1275 //sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), ((strokeColor & 0xffffff00) | SP_COLOR_F_TO_U(opacity*strokeOpacity)), 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1276 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1277 /* fixme: Cannot we cascade it to root more clearly? */
1278 g_signal_connect(G_OBJECT(cbp), "event", G_CALLBACK(sp_desktop_root_handler), SP_EVENT_CONTEXT(dc)->desktop);
1280 dc->segments = g_slist_prepend(dc->segments, cbp);
1281 }
1283 dc->point1[0] = dc->point1[dc->npoints - 1];
1284 dc->point2[0] = dc->point2[dc->npoints - 1];
1285 dc->npoints = 1;
1286 } else {
1287 draw_temporary_box(dc);
1288 }
1289 }
1291 static void
1292 draw_temporary_box(SPDynaDrawContext *dc)
1293 {
1294 dc->currentcurve->reset();
1296 dc->currentcurve->moveto(dc->point1[dc->npoints-1]);
1297 for (gint i = dc->npoints-2; i >= 0; i--) {
1298 dc->currentcurve->lineto(dc->point1[i]);
1299 }
1300 for (gint i = 0; i < dc->npoints; i++) {
1301 dc->currentcurve->lineto(dc->point2[i]);
1302 }
1303 if (dc->npoints >= 2) {
1304 add_cap(dc->currentcurve, dc->point2[dc->npoints-2], dc->point2[dc->npoints-1], dc->point1[dc->npoints-1], dc->point1[dc->npoints-2], dc->cap_rounding);
1305 }
1307 dc->currentcurve->closepath();
1308 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
1309 }
1311 /*
1312 Local Variables:
1313 mode:c++
1314 c-file-style:"stroustrup"
1315 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1316 indent-tabs-mode:nil
1317 fill-column:99
1318 End:
1319 */
1320 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :