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>
32 #include <numeric>
34 #include "svg/svg.h"
35 #include "display/canvas-bpath.h"
36 #include "display/bezier-utils.h"
38 #include <glib/gmem.h>
39 #include "macros.h"
40 #include "document.h"
41 #include "selection.h"
42 #include "desktop.h"
43 #include "desktop-events.h"
44 #include "desktop-handles.h"
45 #include "desktop-affine.h"
46 #include "desktop-style.h"
47 #include "message-context.h"
48 #include "pixmaps/cursor-calligraphy.xpm"
49 #include "libnr/n-art-bpath.h"
50 #include "libnr/nr-path.h"
51 #include "libnr/nr-matrix-ops.h"
52 #include "libnr/nr-scale-translate-ops.h"
53 #include "xml/repr.h"
54 #include "context-fns.h"
55 #include "sp-item.h"
56 #include "inkscape.h"
57 #include "color.h"
58 #include "splivarot.h"
59 #include "sp-item-group.h"
60 #include "sp-shape.h"
61 #include "sp-path.h"
62 #include "sp-text.h"
63 #include "display/canvas-bpath.h"
64 #include "display/canvas-arena.h"
65 #include "livarot/Shape.h"
66 #include "isnan.h"
68 #include "dyna-draw-context.h"
70 #define DDC_RED_RGBA 0xff0000ff
72 #define TOLERANCE_CALLIGRAPHIC 0.1
74 #define DYNA_EPSILON 0.5e-6
75 #define DYNA_EPSILON_START 0.5e-2
76 #define DYNA_VEL_START 1e-5
78 #define DYNA_MIN_WIDTH 1.0e-6
80 #define DRAG_MIN 0.0
81 #define DRAG_DEFAULT 1.0
82 #define DRAG_MAX 1.0
84 // FIXME: move it to some shared file to be reused by both calligraphy and dropper
85 #define C1 0.552
86 static NArtBpath const hatch_area_circle[] = {
87 { NR_MOVETO, 0, 0, 0, 0, -1, 0 },
88 { NR_CURVETO, -1, C1, -C1, 1, 0, 1 },
89 { NR_CURVETO, C1, 1, 1, C1, 1, 0 },
90 { NR_CURVETO, 1, -C1, C1, -1, 0, -1 },
91 { NR_CURVETO, -C1, -1, -1, -C1, -1, 0 },
92 { NR_END, 0, 0, 0, 0, 0, 0 }
93 };
94 #undef C1
97 static void sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass);
98 static void sp_dyna_draw_context_init(SPDynaDrawContext *ddc);
99 static void sp_dyna_draw_context_dispose(GObject *object);
101 static void sp_dyna_draw_context_setup(SPEventContext *ec);
102 static void sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
103 static gint sp_dyna_draw_context_root_handler(SPEventContext *ec, GdkEvent *event);
105 static void clear_current(SPDynaDrawContext *dc);
106 static void set_to_accumulated(SPDynaDrawContext *dc, bool unionize);
107 static void add_cap(SPCurve *curve, NR::Point const &pre, NR::Point const &from, NR::Point const &to, NR::Point const &post, double rounding);
108 static void accumulate_calligraphic(SPDynaDrawContext *dc);
110 static void fit_and_split(SPDynaDrawContext *ddc, gboolean release);
112 static void sp_dyna_draw_reset(SPDynaDrawContext *ddc, NR::Point p);
113 static NR::Point sp_dyna_draw_get_npoint(SPDynaDrawContext const *ddc, NR::Point v);
114 static NR::Point sp_dyna_draw_get_vpoint(SPDynaDrawContext const *ddc, NR::Point n);
115 static void draw_temporary_box(SPDynaDrawContext *dc);
118 static SPEventContextClass *parent_class;
120 GtkType
121 sp_dyna_draw_context_get_type(void)
122 {
123 static GType type = 0;
124 if (!type) {
125 GTypeInfo info = {
126 sizeof(SPDynaDrawContextClass),
127 NULL, NULL,
128 (GClassInitFunc) sp_dyna_draw_context_class_init,
129 NULL, NULL,
130 sizeof(SPDynaDrawContext),
131 4,
132 (GInstanceInitFunc) sp_dyna_draw_context_init,
133 NULL, /* value_table */
134 };
135 type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDynaDrawContext", &info, (GTypeFlags)0);
136 }
137 return type;
138 }
140 static void
141 sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass)
142 {
143 GObjectClass *object_class = (GObjectClass *) klass;
144 SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
146 parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
148 object_class->dispose = sp_dyna_draw_context_dispose;
150 event_context_class->setup = sp_dyna_draw_context_setup;
151 event_context_class->set = sp_dyna_draw_context_set;
152 event_context_class->root_handler = sp_dyna_draw_context_root_handler;
153 }
155 static void
156 sp_dyna_draw_context_init(SPDynaDrawContext *ddc)
157 {
158 SPEventContext *event_context = SP_EVENT_CONTEXT(ddc);
160 event_context->cursor_shape = cursor_calligraphy_xpm;
161 event_context->hot_x = 4;
162 event_context->hot_y = 4;
164 ddc->accumulated = NULL;
165 ddc->segments = NULL;
166 ddc->currentcurve = NULL;
167 ddc->currentshape = NULL;
168 ddc->npoints = 0;
169 ddc->cal1 = NULL;
170 ddc->cal2 = NULL;
171 ddc->repr = NULL;
173 /* DynaDraw values */
174 ddc->cur = NR::Point(0,0);
175 ddc->last = NR::Point(0,0);
176 ddc->vel = NR::Point(0,0);
177 ddc->vel_max = 0;
178 ddc->acc = NR::Point(0,0);
179 ddc->ang = NR::Point(0,0);
180 ddc->del = NR::Point(0,0);
182 /* attributes */
183 ddc->dragging = FALSE;
185 ddc->mass = 0.3;
186 ddc->drag = DRAG_DEFAULT;
187 ddc->angle = 30.0;
188 ddc->width = 0.2;
189 ddc->pressure = DDC_DEFAULT_PRESSURE;
191 ddc->vel_thin = 0.1;
192 ddc->flatness = 0.9;
193 ddc->cap_rounding = 0.0;
195 ddc->abs_width = false;
196 ddc->keep_selected = true;
198 ddc->hatch_spacing = 0;
199 ddc->hatch_spacing_step = 0;
200 new (&ddc->hatch_pointer_past) std::list<double>();
201 new (&ddc->hatch_nearest_past) std::list<double>();
202 ddc->hatch_last_nearest = NR::Point(0,0);
203 ddc->hatch_last_pointer = NR::Point(0,0);
204 ddc->hatch_vector_accumulated = NR::Point(0,0);
205 ddc->hatch_escaped = false;
206 ddc->hatch_area = NULL;
207 ddc->hatch_item = NULL;
208 ddc->hatch_livarot_path = NULL;
210 ddc->trace_bg = false;
211 }
213 static void
214 sp_dyna_draw_context_dispose(GObject *object)
215 {
216 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(object);
218 if (ddc->hatch_area) {
219 gtk_object_destroy(GTK_OBJECT(ddc->hatch_area));
220 ddc->hatch_area = NULL;
221 }
223 if (ddc->accumulated) {
224 ddc->accumulated = sp_curve_unref(ddc->accumulated);
225 }
227 while (ddc->segments) {
228 gtk_object_destroy(GTK_OBJECT(ddc->segments->data));
229 ddc->segments = g_slist_remove(ddc->segments, ddc->segments->data);
230 }
232 if (ddc->currentcurve) ddc->currentcurve = sp_curve_unref(ddc->currentcurve);
233 if (ddc->cal1) ddc->cal1 = sp_curve_unref(ddc->cal1);
234 if (ddc->cal2) ddc->cal2 = sp_curve_unref(ddc->cal2);
236 if (ddc->currentshape) {
237 gtk_object_destroy(GTK_OBJECT(ddc->currentshape));
238 ddc->currentshape = NULL;
239 }
241 if (ddc->_message_context) {
242 delete ddc->_message_context;
243 }
245 G_OBJECT_CLASS(parent_class)->dispose(object);
247 ddc->hatch_pointer_past.~list();
248 ddc->hatch_nearest_past.~list();
249 }
251 static void
252 sp_dyna_draw_context_setup(SPEventContext *ec)
253 {
254 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
256 if (((SPEventContextClass *) parent_class)->setup)
257 ((SPEventContextClass *) parent_class)->setup(ec);
259 ddc->accumulated = sp_curve_new_sized(32);
260 ddc->currentcurve = sp_curve_new_sized(4);
262 ddc->cal1 = sp_curve_new_sized(32);
263 ddc->cal2 = sp_curve_new_sized(32);
265 ddc->currentshape = sp_canvas_item_new(sp_desktop_sketch(ec->desktop), SP_TYPE_CANVAS_BPATH, NULL);
266 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->currentshape), DDC_RED_RGBA, SP_WIND_RULE_EVENODD);
267 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->currentshape), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
268 /* fixme: Cannot we cascade it to root more clearly? */
269 g_signal_connect(G_OBJECT(ddc->currentshape), "event", G_CALLBACK(sp_desktop_root_handler), ec->desktop);
271 {
272 SPCurve *c = sp_curve_new_from_foreign_bpath(hatch_area_circle);
273 ddc->hatch_area = sp_canvas_bpath_new(sp_desktop_controls(ec->desktop), c);
274 sp_curve_unref(c);
275 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->hatch_area), 0x00000000,(SPWindRule)0);
276 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->hatch_area), 0x0000007f, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
277 sp_canvas_item_hide(ddc->hatch_area);
278 }
280 sp_event_context_read(ec, "mass");
281 sp_event_context_read(ec, "wiggle");
282 sp_event_context_read(ec, "angle");
283 sp_event_context_read(ec, "width");
284 sp_event_context_read(ec, "thinning");
285 sp_event_context_read(ec, "tremor");
286 sp_event_context_read(ec, "flatness");
287 sp_event_context_read(ec, "tracebackground");
288 sp_event_context_read(ec, "usepressure");
289 sp_event_context_read(ec, "usetilt");
290 sp_event_context_read(ec, "abs_width");
291 sp_event_context_read(ec, "keep_selected");
292 sp_event_context_read(ec, "cap_rounding");
294 ddc->is_drawing = false;
296 ddc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
297 }
299 static void
300 sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
301 {
302 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
304 if (!strcmp(key, "mass")) {
305 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.2 );
306 ddc->mass = CLAMP(dval, -1000.0, 1000.0);
307 } else if (!strcmp(key, "wiggle")) {
308 double const dval = ( val ? g_ascii_strtod (val, NULL) : (1 - DRAG_DEFAULT));
309 ddc->drag = CLAMP((1 - dval), DRAG_MIN, DRAG_MAX); // drag is inverse to wiggle
310 } else if (!strcmp(key, "angle")) {
311 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0);
312 ddc->angle = CLAMP (dval, -90, 90);
313 } else if (!strcmp(key, "width")) {
314 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
315 ddc->width = CLAMP(dval, -1000.0, 1000.0);
316 } else if (!strcmp(key, "thinning")) {
317 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
318 ddc->vel_thin = CLAMP(dval, -1.0, 1.0);
319 } else if (!strcmp(key, "tremor")) {
320 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0 );
321 ddc->tremor = CLAMP(dval, 0.0, 1.0);
322 } else if (!strcmp(key, "flatness")) {
323 double const dval = ( val ? g_ascii_strtod (val, NULL) : 1.0 );
324 ddc->flatness = CLAMP(dval, 0, 1.0);
325 } else if (!strcmp(key, "tracebackground")) {
326 ddc->trace_bg = (val && strcmp(val, "0"));
327 } else if (!strcmp(key, "usepressure")) {
328 ddc->usepressure = (val && strcmp(val, "0"));
329 } else if (!strcmp(key, "usetilt")) {
330 ddc->usetilt = (val && strcmp(val, "0"));
331 } else if (!strcmp(key, "abs_width")) {
332 ddc->abs_width = (val && strcmp(val, "0"));
333 } else if (!strcmp(key, "keep_selected")) {
334 ddc->keep_selected = (val && strcmp(val, "0"));
335 } else if (!strcmp(key, "cap_rounding")) {
336 ddc->cap_rounding = ( val ? g_ascii_strtod (val, NULL) : 0.0 );
337 }
339 //g_print("DDC: %g %g %g %g\n", ddc->mass, ddc->drag, ddc->angle, ddc->width);
340 }
342 static double
343 flerp(double f0, double f1, double p)
344 {
345 return f0 + ( f1 - f0 ) * p;
346 }
348 /* Get normalized point */
349 static NR::Point
350 sp_dyna_draw_get_npoint(SPDynaDrawContext const *dc, NR::Point v)
351 {
352 NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
353 double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
354 return NR::Point(( v[NR::X] - drect.min()[NR::X] ) / max, ( v[NR::Y] - drect.min()[NR::Y] ) / max);
355 }
357 /* Get view point */
358 static NR::Point
359 sp_dyna_draw_get_vpoint(SPDynaDrawContext const *dc, NR::Point n)
360 {
361 NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
362 double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
363 return NR::Point(n[NR::X] * max + drect.min()[NR::X], n[NR::Y] * max + drect.min()[NR::Y]);
364 }
366 static void
367 sp_dyna_draw_reset(SPDynaDrawContext *dc, NR::Point p)
368 {
369 dc->last = dc->cur = sp_dyna_draw_get_npoint(dc, p);
370 dc->vel = NR::Point(0,0);
371 dc->vel_max = 0;
372 dc->acc = NR::Point(0,0);
373 dc->ang = NR::Point(0,0);
374 dc->del = NR::Point(0,0);
375 }
377 static void
378 sp_dyna_draw_extinput(SPDynaDrawContext *dc, GdkEvent *event)
379 {
380 if (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &dc->pressure))
381 dc->pressure = CLAMP (dc->pressure, DDC_MIN_PRESSURE, DDC_MAX_PRESSURE);
382 else
383 dc->pressure = DDC_DEFAULT_PRESSURE;
385 if (gdk_event_get_axis (event, GDK_AXIS_XTILT, &dc->xtilt))
386 dc->xtilt = CLAMP (dc->xtilt, DDC_MIN_TILT, DDC_MAX_TILT);
387 else
388 dc->xtilt = DDC_DEFAULT_TILT;
390 if (gdk_event_get_axis (event, GDK_AXIS_YTILT, &dc->ytilt))
391 dc->ytilt = CLAMP (dc->ytilt, DDC_MIN_TILT, DDC_MAX_TILT);
392 else
393 dc->ytilt = DDC_DEFAULT_TILT;
394 }
397 static gboolean
398 sp_dyna_draw_apply(SPDynaDrawContext *dc, NR::Point p)
399 {
400 NR::Point n = sp_dyna_draw_get_npoint(dc, p);
402 /* Calculate mass and drag */
403 double const mass = flerp(1.0, 160.0, dc->mass);
404 double const drag = flerp(0.0, 0.5, dc->drag * dc->drag);
406 /* Calculate force and acceleration */
407 NR::Point force = n - dc->cur;
409 // If force is below the absolute threshold DYNA_EPSILON,
410 // or we haven't yet reached DYNA_VEL_START (i.e. at the beginning of stroke)
411 // _and_ the force is below the (higher) DYNA_EPSILON_START threshold,
412 // discard this move.
413 // This prevents flips, blobs, and jerks caused by microscopic tremor of the tablet pen,
414 // especially bothersome at the start of the stroke where we don't yet have the inertia to
415 // smooth them out.
416 if ( NR::L2(force) < DYNA_EPSILON || (dc->vel_max < DYNA_VEL_START && NR::L2(force) < DYNA_EPSILON_START)) {
417 return FALSE;
418 }
420 dc->acc = force / mass;
422 /* Calculate new velocity */
423 dc->vel += dc->acc;
425 if (NR::L2(dc->vel) > dc->vel_max)
426 dc->vel_max = NR::L2(dc->vel);
428 /* Calculate angle of drawing tool */
430 double a1;
431 if (dc->usetilt) {
432 // 1a. calculate nib angle from input device tilt:
433 gdouble length = std::sqrt(dc->xtilt*dc->xtilt + dc->ytilt*dc->ytilt);;
435 if (length > 0) {
436 NR::Point ang1 = NR::Point(dc->ytilt/length, dc->xtilt/length);
437 a1 = atan2(ang1);
438 }
439 else
440 a1 = 0.0;
441 }
442 else {
443 // 1b. fixed dc->angle (absolutely flat nib):
444 double const radians = ( (dc->angle - 90) / 180.0 ) * M_PI;
445 NR::Point ang1 = NR::Point(-sin(radians), cos(radians));
446 a1 = atan2(ang1);
447 }
449 // 2. perpendicular to dc->vel (absolutely non-flat nib):
450 gdouble const mag_vel = NR::L2(dc->vel);
451 if ( mag_vel < DYNA_EPSILON ) {
452 return FALSE;
453 }
454 NR::Point ang2 = NR::rot90(dc->vel) / mag_vel;
456 // 3. Average them using flatness parameter:
457 // calculate angles
458 double a2 = atan2(ang2);
459 // flip a2 to force it to be in the same half-circle as a1
460 bool flipped = false;
461 if (fabs (a2-a1) > 0.5*M_PI) {
462 a2 += M_PI;
463 flipped = true;
464 }
465 // normalize a2
466 if (a2 > M_PI)
467 a2 -= 2*M_PI;
468 if (a2 < -M_PI)
469 a2 += 2*M_PI;
470 // find the flatness-weighted bisector angle, unflip if a2 was flipped
471 // FIXME: when dc->vel is oscillating around the fixed angle, the new_ang flips back and forth. How to avoid this?
472 double new_ang = a1 + (1 - dc->flatness) * (a2 - a1) - (flipped? M_PI : 0);
474 // Try to detect a sudden flip when the new angle differs too much from the previous for the
475 // current velocity; in that case discard this move
476 double angle_delta = NR::L2(NR::Point (cos (new_ang), sin (new_ang)) - dc->ang);
477 if ( angle_delta / NR::L2(dc->vel) > 4000 ) {
478 return FALSE;
479 }
481 // convert to point
482 dc->ang = NR::Point (cos (new_ang), sin (new_ang));
484 // 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);
486 /* Apply drag */
487 dc->vel *= 1.0 - drag;
489 /* Update position */
490 dc->last = dc->cur;
491 dc->cur += dc->vel;
493 return TRUE;
494 }
496 static void
497 sp_dyna_draw_brush(SPDynaDrawContext *dc)
498 {
499 g_assert( dc->npoints >= 0 && dc->npoints < SAMPLING_SIZE );
501 // How much velocity thins strokestyle
502 double vel_thin = flerp (0, 160, dc->vel_thin);
504 // Influence of pressure on thickness
505 double pressure_thick = (dc->usepressure ? dc->pressure : 1.0);
507 // get the real brush point, not the same as pointer (affected by hatch tracking and/or mass
508 // drag)
509 NR::Point brush = sp_dyna_draw_get_vpoint(dc, dc->cur);
510 NR::Point brush_w = SP_EVENT_CONTEXT(dc)->desktop->d2w(brush);
512 double trace_thick = 1;
513 if (dc->trace_bg) {
514 // pick single pixel
515 NRPixBlock pb;
516 int x = (int) floor(brush_w[NR::X]);
517 int y = (int) floor(brush_w[NR::Y]);
518 nr_pixblock_setup_fast(&pb, NR_PIXBLOCK_MODE_R8G8B8A8P, x, y, x+1, y+1, TRUE);
519 sp_canvas_arena_render_pixblock(SP_CANVAS_ARENA(sp_desktop_drawing(SP_EVENT_CONTEXT(dc)->desktop)), &pb);
520 const unsigned char *s = NR_PIXBLOCK_PX(&pb);
521 double R = s[0] / 255.0;
522 double G = s[1] / 255.0;
523 double B = s[2] / 255.0;
524 double A = s[3] / 255.0;
525 double max = MAX (MAX (R, G), B);
526 double min = MIN (MIN (R, G), B);
527 double L = A * (max + min)/2 + (1 - A); // blend with white bg
528 trace_thick = 1 - L;
529 //g_print ("L %g thick %g\n", L, trace_thick);
530 }
532 double width = (pressure_thick * trace_thick - vel_thin * NR::L2(dc->vel)) * dc->width;
534 double tremble_left = 0, tremble_right = 0;
535 if (dc->tremor > 0) {
536 // obtain two normally distributed random variables, using polar Box-Muller transform
537 double x1, x2, w, y1, y2;
538 do {
539 x1 = 2.0 * g_random_double_range(0,1) - 1.0;
540 x2 = 2.0 * g_random_double_range(0,1) - 1.0;
541 w = x1 * x1 + x2 * x2;
542 } while ( w >= 1.0 );
543 w = sqrt( (-2.0 * log( w ) ) / w );
544 y1 = x1 * w;
545 y2 = x2 * w;
547 // deflect both left and right edges randomly and independently, so that:
548 // (1) dc->tremor=1 corresponds to sigma=1, decreasing dc->tremor narrows the bell curve;
549 // (2) deflection depends on width, but is upped for small widths for better visual uniformity across widths;
550 // (3) deflection somewhat depends on speed, to prevent fast strokes looking
551 // comparatively smooth and slow ones excessively jittery
552 tremble_left = (y1)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
553 tremble_right = (y2)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
554 }
556 if ( width < 0.02 * dc->width ) {
557 width = 0.02 * dc->width;
558 }
560 double dezoomify_factor = 0.05 * 1000;
561 if (!dc->abs_width) {
562 dezoomify_factor /= SP_EVENT_CONTEXT(dc)->desktop->current_zoom();
563 }
565 NR::Point del_left = dezoomify_factor * (width + tremble_left) * dc->ang;
566 NR::Point del_right = dezoomify_factor * (width + tremble_right) * dc->ang;
568 dc->point1[dc->npoints] = brush + del_left;
569 dc->point2[dc->npoints] = brush - del_right;
571 dc->del = 0.5*(del_left + del_right);
573 dc->npoints++;
574 }
576 void
577 sp_ddc_update_toolbox (SPDesktop *desktop, const gchar *id, double value)
578 {
579 desktop->setToolboxAdjustmentValue (id, value);
580 }
582 static void
583 calligraphic_cancel(SPDynaDrawContext *dc)
584 {
585 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
586 dc->dragging = FALSE;
587 dc->is_drawing = false;
588 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), 0);
589 /* Remove all temporary line segments */
590 while (dc->segments) {
591 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
592 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
593 }
594 /* reset accumulated curve */
595 sp_curve_reset(dc->accumulated);
596 clear_current(dc);
597 if (dc->repr) {
598 dc->repr = NULL;
599 }
600 }
603 gint
604 sp_dyna_draw_context_root_handler(SPEventContext *event_context,
605 GdkEvent *event)
606 {
607 SPDynaDrawContext *dc = SP_DYNA_DRAW_CONTEXT(event_context);
608 SPDesktop *desktop = event_context->desktop;
610 gint ret = FALSE;
612 switch (event->type) {
613 case GDK_BUTTON_PRESS:
614 if (event->button.button == 1 && !event_context->space_panning) {
616 SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
618 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
619 return TRUE;
620 }
622 NR::Point const button_w(event->button.x,
623 event->button.y);
624 NR::Point const button_dt(desktop->w2d(button_w));
625 sp_dyna_draw_reset(dc, button_dt);
626 sp_dyna_draw_extinput(dc, event);
627 sp_dyna_draw_apply(dc, button_dt);
628 sp_curve_reset(dc->accumulated);
629 if (dc->repr) {
630 dc->repr = NULL;
631 }
633 /* initialize first point */
634 dc->npoints = 0;
636 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
637 ( GDK_KEY_PRESS_MASK |
638 GDK_BUTTON_RELEASE_MASK |
639 GDK_POINTER_MOTION_MASK |
640 GDK_BUTTON_PRESS_MASK ),
641 NULL,
642 event->button.time);
644 ret = TRUE;
646 sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 3);
647 dc->is_drawing = true;
648 }
649 break;
650 case GDK_MOTION_NOTIFY:
651 {
652 NR::Point const motion_w(event->motion.x,
653 event->motion.y);
654 NR::Point motion_dt(desktop->w2d(motion_w));
655 sp_dyna_draw_extinput(dc, event);
657 dc->_message_context->clear();
659 // for hatching:
660 double hatch_dist = 0;
661 NR::Point hatch_unit_vector(0,0);
662 NR::Point nearest(0,0);
663 NR::Point pointer(0,0);
664 NR::Matrix motion_to_curve(NR::identity());
666 if (event->motion.state & GDK_CONTROL_MASK) { // hatching - sense the item
668 SPItem *selected = sp_desktop_selection(desktop)->singleItem();
669 if (selected && (SP_IS_SHAPE(selected) || SP_IS_TEXT(selected))) {
670 // One item selected, and it's a path;
671 // let's try to track it as a guide
673 if (selected != dc->hatch_item) {
674 dc->hatch_item = selected;
675 if (dc->hatch_livarot_path)
676 delete dc->hatch_livarot_path;
677 dc->hatch_livarot_path = Path_for_item (dc->hatch_item, true, true);
678 dc->hatch_livarot_path->ConvertWithBackData(0.01);
679 }
681 // calculate pointer point in the guide item's coords
682 motion_to_curve = sp_item_dt2i_affine(selected) * sp_item_i2doc_affine(selected);
683 pointer = motion_dt * motion_to_curve;
685 // calculate the nearest point on the guide path
686 NR::Maybe<Path::cut_position> position = get_nearest_position_on_Path(dc->hatch_livarot_path, pointer);
687 nearest = get_point_on_Path(dc->hatch_livarot_path, position->piece, position->t);
690 // distance from pointer to nearest
691 hatch_dist = NR::L2(pointer - nearest);
692 // unit-length vector
693 hatch_unit_vector = (pointer - nearest)/hatch_dist;
695 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Guide path selected</b>; start drawing along the guide with <b>Ctrl</b>"));
696 } else {
697 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Select a guide path</b> to track with <b>Ctrl</b>"));
698 }
699 }
701 if ( dc->is_drawing && (event->motion.state & GDK_BUTTON1_MASK) && !event_context->space_panning) {
702 dc->dragging = TRUE;
704 if (event->motion.state & GDK_CONTROL_MASK && dc->hatch_item) { // hatching
706 #define SPEED_ELEMENTS 12
707 #define SPEED_MIN 0.12
708 #define SPEED_NORMAL 0.65
710 // speed is the movement of the nearest point along the guide path, divided by
711 // the movement of the pointer at the same period; it is averaged for the last
712 // SPEED_ELEMENTS motion events. Normally, as you track the guide path, speed
713 // is about 1, i.e. the nearest point on the path is moved by about the same
714 // distance as the pointer. If the speed starts to decrease, we are losing
715 // contact with the guide; if it drops below SPEED_MIN, we are on our own and
716 // not attracted to guide anymore. Most often this happens when you have
717 // tracked to the end of a guide calligraphic stroke and keep moving
718 // further. We try to handle this situation gracefully: not stick with the
719 // guide forever but let go of it smoothly and without sharp jerks (non-zero
720 // mass recommended; with zero mass, jerks are still quite noticeable).
722 double speed = 1;
723 if (NR::L2(dc->hatch_last_nearest) != 0) {
724 // the distance nearest moved since the last motion event
725 double nearest_moved = NR::L2(nearest - dc->hatch_last_nearest);
726 // the distance pointer moved since the last motion event
727 double pointer_moved = NR::L2(pointer - dc->hatch_last_pointer);
728 // store them in stacks limited to SPEED_ELEMENTS
729 dc->hatch_nearest_past.push_front(nearest_moved);
730 if (dc->hatch_nearest_past.size() > SPEED_ELEMENTS)
731 dc->hatch_nearest_past.pop_back();
732 dc->hatch_pointer_past.push_front(pointer_moved);
733 if (dc->hatch_pointer_past.size() > SPEED_ELEMENTS)
734 dc->hatch_pointer_past.pop_back();
736 // If the stacks are full,
737 if (dc->hatch_nearest_past.size() == SPEED_ELEMENTS) {
738 // calculate the sums of all stored movements
739 double nearest_sum = std::accumulate (dc->hatch_nearest_past.begin(), dc->hatch_nearest_past.end(), 0.0);
740 double pointer_sum = std::accumulate (dc->hatch_pointer_past.begin(), dc->hatch_pointer_past.end(), 0.0);
741 // and divide to get the speed
742 speed = nearest_sum/pointer_sum;
743 //g_print ("nearest sum %g pointer_sum %g speed %g\n", nearest_sum, pointer_sum, speed);
744 }
745 }
747 if ( dc->hatch_escaped // already escaped, do not reattach
748 || (speed < SPEED_MIN) // stuck; most likely reached end of traced stroke
749 || (dc->hatch_spacing > 0 && hatch_dist > 50 * dc->hatch_spacing) // went too far from the guide
750 ) {
751 // We are NOT attracted to the guide!
753 //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);
755 // Remember hatch_escaped so we don't get
756 // attracted again until the end of this stroke
757 dc->hatch_escaped = true;
759 } else {
761 // Calculate angle cosine of this vector-to-guide and all past vectors
762 // summed, to detect if we accidentally flipped to the other side of the
763 // guide
764 double dot = NR::dot (pointer - nearest, dc->hatch_vector_accumulated);
765 dot /= NR::L2(pointer - nearest) * NR::L2(dc->hatch_vector_accumulated);
767 if (dc->hatch_spacing != 0) { // spacing was already set
768 double target;
769 if (speed > SPEED_NORMAL) {
770 // all ok, strictly obey the spacing
771 target = dc->hatch_spacing;
772 } else {
773 // looks like we're starting to lose speed,
774 // so _gradually_ let go attraction to prevent jerks
775 target = (dc->hatch_spacing * speed + hatch_dist * (SPEED_NORMAL - speed))/SPEED_NORMAL;
776 }
777 if (!isNaN(dot) && dot < -0.5) {// flip
778 target = -target;
779 }
781 // This is the track pointer that we will use instead of the real one
782 NR::Point new_pointer = nearest + target * hatch_unit_vector;
784 // some limited feedback: allow persistent pulling to slightly change
785 // the spacing
786 dc->hatch_spacing += (hatch_dist - dc->hatch_spacing)/3500;
788 // return it to the desktop coords
789 motion_dt = new_pointer * motion_to_curve.inverse();
791 } else {
792 // this is the first motion event, set the dist
793 dc->hatch_spacing = hatch_dist;
794 }
796 // remember last points
797 dc->hatch_last_pointer = pointer;
798 dc->hatch_last_nearest = nearest;
799 dc->hatch_vector_accumulated += (pointer - nearest);
800 }
802 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, dc->hatch_escaped? _("Tracking: <b>connection to guide path lost!</b>") : _("<b>Tracking</b> a guide path"));
804 } else {
805 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Drawing</b> a calligraphic stroke"));
806 }
808 if (!sp_dyna_draw_apply(dc, motion_dt)) {
809 ret = TRUE;
810 break;
811 }
813 if ( dc->cur != dc->last ) {
814 sp_dyna_draw_brush(dc);
815 g_assert( dc->npoints > 0 );
816 fit_and_split(dc, FALSE);
817 }
818 ret = TRUE;
819 }
821 // Draw the hatching circle if necessary
822 if (event->motion.state & GDK_CONTROL_MASK) {
823 if (dc->hatch_spacing == 0 && hatch_dist != 0) {
824 // Haven't set spacing yet: gray, center free, update radius live
825 NR::Point c = desktop->w2d(motion_w);
826 NR::Matrix const sm (NR::scale(hatch_dist, hatch_dist) * NR::translate(c));
827 sp_canvas_item_affine_absolute(dc->hatch_area, sm);
828 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0x7f7f7fff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
829 sp_canvas_item_show(dc->hatch_area);
830 } else if (dc->dragging && !dc->hatch_escaped) {
831 // Tracking: green, center snapped, fixed radius
832 NR::Point c = motion_dt;
833 NR::Matrix const sm (NR::scale(dc->hatch_spacing, dc->hatch_spacing) * 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), 0x00FF00ff, 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 escaped: red, center free, fixed radius
839 NR::Point c = desktop->w2d(motion_w);
840 NR::Matrix const sm (NR::scale(dc->hatch_spacing, dc->hatch_spacing) * NR::translate(c));
842 sp_canvas_item_affine_absolute(dc->hatch_area, sm);
843 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0xFF0000ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
844 sp_canvas_item_show(dc->hatch_area);
845 } else {
846 // Not drawing but spacing set: gray, center snapped, fixed radius
847 NR::Point c = (nearest + dc->hatch_spacing * hatch_unit_vector) * motion_to_curve.inverse();
848 if (!isNaN(c[NR::X]) && !isNaN(c[NR::Y])) {
849 NR::Matrix const sm (NR::scale(dc->hatch_spacing, dc->hatch_spacing) * NR::translate(c));
850 sp_canvas_item_affine_absolute(dc->hatch_area, sm);
851 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0x7f7f7fff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
852 sp_canvas_item_show(dc->hatch_area);
853 }
854 }
855 } else {
856 sp_canvas_item_hide(dc->hatch_area);
857 }
858 }
859 break;
862 case GDK_BUTTON_RELEASE:
863 {
864 NR::Point const motion_w(event->button.x, event->button.y);
865 NR::Point const motion_dt(desktop->w2d(motion_w));
867 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
868 sp_canvas_end_forced_full_redraws(desktop->canvas);
869 dc->is_drawing = false;
871 if (dc->dragging && event->button.button == 1 && !event_context->space_panning) {
872 dc->dragging = FALSE;
874 sp_dyna_draw_apply(dc, motion_dt);
876 /* Remove all temporary line segments */
877 while (dc->segments) {
878 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
879 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
880 }
882 /* Create object */
883 fit_and_split(dc, TRUE);
884 accumulate_calligraphic(dc);
885 set_to_accumulated(dc, event->button.state & GDK_SHIFT_MASK); // performs document_done
887 /* reset accumulated curve */
888 sp_curve_reset(dc->accumulated);
890 clear_current(dc);
891 if (dc->repr) {
892 dc->repr = NULL;
893 }
895 if (!dc->hatch_pointer_past.empty()) dc->hatch_pointer_past.clear();
896 if (!dc->hatch_nearest_past.empty()) dc->hatch_nearest_past.clear();
897 dc->hatch_last_nearest = NR::Point(0,0);
898 dc->hatch_last_pointer = NR::Point(0,0);
899 dc->hatch_vector_accumulated = NR::Point(0,0);
900 dc->hatch_escaped = false;
901 dc->hatch_item = NULL;
902 dc->hatch_livarot_path = NULL;
904 if (dc->hatch_spacing != 0 && !dc->keep_selected) {
905 // we do not select the newly drawn path, so increase spacing by step
906 if (dc->hatch_spacing_step == 0) {
907 dc->hatch_spacing_step = dc->hatch_spacing;
908 }
909 dc->hatch_spacing += dc->hatch_spacing_step;
910 }
912 dc->_message_context->clear();
913 ret = TRUE;
914 }
915 break;
916 }
918 case GDK_KEY_PRESS:
919 switch (get_group0_keyval (&event->key)) {
920 case GDK_Up:
921 case GDK_KP_Up:
922 if (!MOD__CTRL_ONLY) {
923 dc->angle += 5.0;
924 if (dc->angle > 90.0)
925 dc->angle = 90.0;
926 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
927 ret = TRUE;
928 }
929 break;
930 case GDK_Down:
931 case GDK_KP_Down:
932 if (!MOD__CTRL_ONLY) {
933 dc->angle -= 5.0;
934 if (dc->angle < -90.0)
935 dc->angle = -90.0;
936 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
937 ret = TRUE;
938 }
939 break;
940 case GDK_Right:
941 case GDK_KP_Right:
942 if (!MOD__CTRL_ONLY) {
943 dc->width += 0.01;
944 if (dc->width > 1.0)
945 dc->width = 1.0;
946 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100); // the same spinbutton is for alt+x
947 ret = TRUE;
948 }
949 break;
950 case GDK_Left:
951 case GDK_KP_Left:
952 if (!MOD__CTRL_ONLY) {
953 dc->width -= 0.01;
954 if (dc->width < 0.01)
955 dc->width = 0.01;
956 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
957 ret = TRUE;
958 }
959 break;
960 case GDK_Home:
961 case GDK_KP_Home:
962 dc->width = 0.01;
963 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
964 ret = TRUE;
965 break;
966 case GDK_End:
967 case GDK_KP_End:
968 dc->width = 1.0;
969 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
970 ret = TRUE;
971 break;
972 case GDK_x:
973 case GDK_X:
974 if (MOD__ALT_ONLY) {
975 desktop->setToolboxFocusTo ("altx-calligraphy");
976 ret = TRUE;
977 }
978 break;
979 case GDK_Escape:
980 if (dc->is_drawing) {
981 // if drawing, cancel, otherwise pass it up for deselecting
982 calligraphic_cancel (dc);
983 ret = TRUE;
984 }
985 break;
986 case GDK_z:
987 case GDK_Z:
988 if (MOD__CTRL_ONLY && dc->is_drawing) {
989 // if drawing, cancel, otherwise pass it up for undo
990 calligraphic_cancel (dc);
991 ret = TRUE;
992 }
993 break;
994 default:
995 break;
996 }
997 break;
999 case GDK_KEY_RELEASE:
1000 switch (get_group0_keyval(&event->key)) {
1001 case GDK_Control_L:
1002 case GDK_Control_R:
1003 dc->_message_context->clear();
1004 dc->hatch_spacing = 0;
1005 dc->hatch_spacing_step = 0;
1006 break;
1007 default:
1008 break;
1009 }
1011 default:
1012 break;
1013 }
1015 if (!ret) {
1016 if (((SPEventContextClass *) parent_class)->root_handler) {
1017 ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
1018 }
1019 }
1021 return ret;
1022 }
1025 static void
1026 clear_current(SPDynaDrawContext *dc)
1027 {
1028 /* reset bpath */
1029 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), NULL);
1030 /* reset curve */
1031 sp_curve_reset(dc->currentcurve);
1032 sp_curve_reset(dc->cal1);
1033 sp_curve_reset(dc->cal2);
1034 /* reset points */
1035 dc->npoints = 0;
1036 }
1038 static void
1039 set_to_accumulated(SPDynaDrawContext *dc, bool unionize)
1040 {
1041 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
1043 if (!sp_curve_empty(dc->accumulated)) {
1044 NArtBpath *abp;
1045 gchar *str;
1047 if (!dc->repr) {
1048 /* Create object */
1049 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
1050 Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
1052 /* Set style */
1053 sp_desktop_apply_style_tool (desktop, repr, "tools.calligraphic", false);
1055 dc->repr = repr;
1057 SPItem *item=SP_ITEM(desktop->currentLayer()->appendChildRepr(dc->repr));
1058 Inkscape::GC::release(dc->repr);
1059 item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
1060 item->updateRepr();
1061 }
1062 abp = nr_artpath_affine(sp_curve_first_bpath(dc->accumulated), sp_desktop_dt2root_affine(desktop));
1063 str = sp_svg_write_path(abp);
1064 g_assert( str != NULL );
1065 g_free(abp);
1066 dc->repr->setAttribute("d", str);
1067 g_free(str);
1069 if (unionize) {
1070 sp_desktop_selection(desktop)->add(dc->repr);
1071 sp_selected_path_union_skip_undo();
1072 } else {
1073 if (dc->keep_selected) {
1074 sp_desktop_selection(desktop)->set(dc->repr);
1075 }
1076 }
1078 } else {
1079 if (dc->repr) {
1080 sp_repr_unparent(dc->repr);
1081 }
1082 dc->repr = NULL;
1083 }
1085 sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_CALLIGRAPHIC,
1086 _("Draw calligraphic stroke"));
1087 }
1089 static void
1090 add_cap(SPCurve *curve,
1091 NR::Point const &pre, NR::Point const &from,
1092 NR::Point const &to, NR::Point const &post,
1093 double rounding)
1094 {
1095 NR::Point vel = rounding * NR::rot90( to - from ) / sqrt(2.0);
1096 double mag = NR::L2(vel);
1098 NR::Point v_in = from - pre;
1099 double mag_in = NR::L2(v_in);
1100 if ( mag_in > DYNA_EPSILON ) {
1101 v_in = mag * v_in / mag_in;
1102 } else {
1103 v_in = NR::Point(0, 0);
1104 }
1106 NR::Point v_out = to - post;
1107 double mag_out = NR::L2(v_out);
1108 if ( mag_out > DYNA_EPSILON ) {
1109 v_out = mag * v_out / mag_out;
1110 } else {
1111 v_out = NR::Point(0, 0);
1112 }
1114 if ( NR::L2(v_in) > DYNA_EPSILON || NR::L2(v_out) > DYNA_EPSILON ) {
1115 sp_curve_curveto(curve, from + v_in, to + v_out, to);
1116 }
1117 }
1119 static void
1120 accumulate_calligraphic(SPDynaDrawContext *dc)
1121 {
1122 if ( !sp_curve_empty(dc->cal1) && !sp_curve_empty(dc->cal2) ) {
1123 sp_curve_reset(dc->accumulated); /* Is this required ?? */
1124 SPCurve *rev_cal2 = sp_curve_reverse(dc->cal2);
1126 g_assert(dc->cal1->end > 1);
1127 g_assert(rev_cal2->end > 1);
1128 g_assert(SP_CURVE_SEGMENT(dc->cal1, 0)->code == NR_MOVETO_OPEN);
1129 g_assert(SP_CURVE_SEGMENT(rev_cal2, 0)->code == NR_MOVETO_OPEN);
1130 g_assert(SP_CURVE_SEGMENT(dc->cal1, 1)->code == NR_CURVETO);
1131 g_assert(SP_CURVE_SEGMENT(rev_cal2, 1)->code == NR_CURVETO);
1132 g_assert(SP_CURVE_SEGMENT(dc->cal1, dc->cal1->end-1)->code == NR_CURVETO);
1133 g_assert(SP_CURVE_SEGMENT(rev_cal2, rev_cal2->end-1)->code == NR_CURVETO);
1135 sp_curve_append(dc->accumulated, dc->cal1, FALSE);
1137 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);
1139 sp_curve_append(dc->accumulated, rev_cal2, TRUE);
1141 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);
1143 sp_curve_closepath(dc->accumulated);
1145 sp_curve_unref(rev_cal2);
1147 sp_curve_reset(dc->cal1);
1148 sp_curve_reset(dc->cal2);
1149 }
1150 }
1152 static double square(double const x)
1153 {
1154 return x * x;
1155 }
1157 static void
1158 fit_and_split(SPDynaDrawContext *dc, gboolean release)
1159 {
1160 double const tolerance_sq = square( NR::expansion(SP_EVENT_CONTEXT(dc)->desktop->w2d()) * TOLERANCE_CALLIGRAPHIC );
1162 #ifdef DYNA_DRAW_VERBOSE
1163 g_print("[F&S:R=%c]", release?'T':'F');
1164 #endif
1166 if (!( dc->npoints > 0 && dc->npoints < SAMPLING_SIZE ))
1167 return; // just clicked
1169 if ( dc->npoints == SAMPLING_SIZE - 1 || release ) {
1170 #define BEZIER_SIZE 4
1171 #define BEZIER_MAX_BEZIERS 8
1172 #define BEZIER_MAX_LENGTH ( BEZIER_SIZE * BEZIER_MAX_BEZIERS )
1174 #ifdef DYNA_DRAW_VERBOSE
1175 g_print("[F&S:#] dc->npoints:%d, release:%s\n",
1176 dc->npoints, release ? "TRUE" : "FALSE");
1177 #endif
1179 /* Current calligraphic */
1180 if ( dc->cal1->end == 0 || dc->cal2->end == 0 ) {
1181 /* dc->npoints > 0 */
1182 /* g_print("calligraphics(1|2) reset\n"); */
1183 sp_curve_reset(dc->cal1);
1184 sp_curve_reset(dc->cal2);
1186 sp_curve_moveto(dc->cal1, dc->point1[0]);
1187 sp_curve_moveto(dc->cal2, dc->point2[0]);
1188 }
1190 NR::Point b1[BEZIER_MAX_LENGTH];
1191 gint const nb1 = sp_bezier_fit_cubic_r(b1, dc->point1, dc->npoints,
1192 tolerance_sq, BEZIER_MAX_BEZIERS);
1193 g_assert( nb1 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b1)) );
1195 NR::Point b2[BEZIER_MAX_LENGTH];
1196 gint const nb2 = sp_bezier_fit_cubic_r(b2, dc->point2, dc->npoints,
1197 tolerance_sq, BEZIER_MAX_BEZIERS);
1198 g_assert( nb2 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b2)) );
1200 if ( nb1 != -1 && nb2 != -1 ) {
1201 /* Fit and draw and reset state */
1202 #ifdef DYNA_DRAW_VERBOSE
1203 g_print("nb1:%d nb2:%d\n", nb1, nb2);
1204 #endif
1205 /* CanvasShape */
1206 if (! release) {
1207 sp_curve_reset(dc->currentcurve);
1208 sp_curve_moveto(dc->currentcurve, b1[0]);
1209 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
1210 sp_curve_curveto(dc->currentcurve, bp1[1],
1211 bp1[2], bp1[3]);
1212 }
1213 sp_curve_lineto(dc->currentcurve,
1214 b2[BEZIER_SIZE*(nb2-1) + 3]);
1215 for (NR::Point *bp2 = b2 + BEZIER_SIZE * ( nb2 - 1 ); bp2 >= b2; bp2 -= BEZIER_SIZE) {
1216 sp_curve_curveto(dc->currentcurve, bp2[2], bp2[1], bp2[0]);
1217 }
1218 // FIXME: dc->segments is always NULL at this point??
1219 if (!dc->segments) { // first segment
1220 add_cap(dc->currentcurve, b2[1], b2[0], b1[0], b1[1], dc->cap_rounding);
1221 }
1222 sp_curve_closepath(dc->currentcurve);
1223 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
1224 }
1226 /* Current calligraphic */
1227 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
1228 sp_curve_curveto(dc->cal1, bp1[1], bp1[2], bp1[3]);
1229 }
1230 for (NR::Point *bp2 = b2; bp2 < b2 + BEZIER_SIZE * nb2; bp2 += BEZIER_SIZE) {
1231 sp_curve_curveto(dc->cal2, bp2[1], bp2[2], bp2[3]);
1232 }
1233 } else {
1234 /* fixme: ??? */
1235 #ifdef DYNA_DRAW_VERBOSE
1236 g_print("[fit_and_split] failed to fit-cubic.\n");
1237 #endif
1238 draw_temporary_box(dc);
1240 for (gint i = 1; i < dc->npoints; i++) {
1241 sp_curve_lineto(dc->cal1, dc->point1[i]);
1242 }
1243 for (gint i = 1; i < dc->npoints; i++) {
1244 sp_curve_lineto(dc->cal2, dc->point2[i]);
1245 }
1246 }
1248 /* Fit and draw and copy last point */
1249 #ifdef DYNA_DRAW_VERBOSE
1250 g_print("[%d]Yup\n", dc->npoints);
1251 #endif
1252 if (!release) {
1253 g_assert(!sp_curve_empty(dc->currentcurve));
1255 SPCanvasItem *cbp = sp_canvas_item_new(sp_desktop_sketch(SP_EVENT_CONTEXT(dc)->desktop),
1256 SP_TYPE_CANVAS_BPATH,
1257 NULL);
1258 SPCurve *curve = sp_curve_copy(dc->currentcurve);
1259 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH (cbp), curve);
1260 sp_curve_unref(curve);
1262 guint32 fillColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", true);
1263 //guint32 strokeColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", false);
1264 double opacity = sp_desktop_get_master_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic");
1265 double fillOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", true);
1266 //double strokeOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", false);
1267 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cbp), ((fillColor & 0xffffff00) | SP_COLOR_F_TO_U(opacity*fillOpacity)), SP_WIND_RULE_EVENODD);
1268 //on second thougtht don't do stroke yet because we don't have stoke-width yet and because stoke appears between segments while drawing
1269 //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);
1270 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1271 /* fixme: Cannot we cascade it to root more clearly? */
1272 g_signal_connect(G_OBJECT(cbp), "event", G_CALLBACK(sp_desktop_root_handler), SP_EVENT_CONTEXT(dc)->desktop);
1274 dc->segments = g_slist_prepend(dc->segments, cbp);
1275 }
1277 dc->point1[0] = dc->point1[dc->npoints - 1];
1278 dc->point2[0] = dc->point2[dc->npoints - 1];
1279 dc->npoints = 1;
1280 } else {
1281 draw_temporary_box(dc);
1282 }
1283 }
1285 static void
1286 draw_temporary_box(SPDynaDrawContext *dc)
1287 {
1288 sp_curve_reset(dc->currentcurve);
1290 sp_curve_moveto(dc->currentcurve, dc->point1[dc->npoints-1]);
1291 for (gint i = dc->npoints-2; i >= 0; i--) {
1292 sp_curve_lineto(dc->currentcurve, dc->point1[i]);
1293 }
1294 for (gint i = 0; i < dc->npoints; i++) {
1295 sp_curve_lineto(dc->currentcurve, dc->point2[i]);
1296 }
1297 if (dc->npoints >= 2) {
1298 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);
1299 }
1301 sp_curve_closepath(dc->currentcurve);
1302 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
1303 }
1305 /*
1306 Local Variables:
1307 mode:c++
1308 c-file-style:"stroustrup"
1309 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1310 indent-tabs-mode:nil
1311 fill-column:99
1312 End:
1313 */
1314 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :