#define __SP_DYNA_DRAW_CONTEXT_C__ /* * Handwriting-like drawing mode * * Authors: * Mitsuru Oka * Lauris Kaplinski * bulia byak * MenTaLguY * * The original dynadraw code: * Paul Haeberli * * Copyright (C) 1998 The Free Software Foundation * Copyright (C) 1999-2005 authors * Copyright (C) 2001-2002 Ximian, Inc. * Copyright (C) 2005-2006 bulia byak * Copyright (C) 2006 MenTaLguY * * Released under GNU GPL, read the file 'COPYING' for more information */ #define noDYNA_DRAW_VERBOSE #include "config.h" #include #include #include #include "svg/svg.h" #include "display/canvas-bpath.h" #include "display/bezier-utils.h" #include #include "macros.h" #include "document.h" #include "selection.h" #include "desktop.h" #include "desktop-events.h" #include "desktop-handles.h" #include "desktop-affine.h" #include "desktop-style.h" #include "message-context.h" #include "pixmaps/cursor-calligraphy.xpm" #include "dyna-draw-context.h" #include "libnr/n-art-bpath.h" #include "libnr/nr-path.h" #include "xml/repr.h" #include "context-fns.h" #include "sp-item.h" #include "inkscape.h" #include "color.h" #define DDC_RED_RGBA 0xff0000ff #define SAMPLE_TIMEOUT 10 #define TOLERANCE_LINE 1.0 #define TOLERANCE_CALLIGRAPHIC 3.0 #define DYNA_EPSILON 0.5e-6 #define DYNA_EPSILON_START 0.5e-2 #define DYNA_VEL_START 1e-5 #define DYNA_MIN_WIDTH 1.0e-6 #define DRAG_MIN 0.0 #define DRAG_DEFAULT 1.0 #define DRAG_MAX 1.0 static void sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass); static void sp_dyna_draw_context_init(SPDynaDrawContext *ddc); static void sp_dyna_draw_context_dispose(GObject *object); static void sp_dyna_draw_context_setup(SPEventContext *ec); static void sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val); static gint sp_dyna_draw_context_root_handler(SPEventContext *ec, GdkEvent *event); static void clear_current(SPDynaDrawContext *dc); static void set_to_accumulated(SPDynaDrawContext *dc); static void add_cap(SPCurve *curve, NR::Point const &pre, NR::Point const &from, NR::Point const &to, NR::Point const &post, double rounding); static void accumulate_calligraphic(SPDynaDrawContext *dc); static void fit_and_split(SPDynaDrawContext *ddc, gboolean release); static void sp_dyna_draw_reset(SPDynaDrawContext *ddc, NR::Point p); static NR::Point sp_dyna_draw_get_npoint(SPDynaDrawContext const *ddc, NR::Point v); static NR::Point sp_dyna_draw_get_vpoint(SPDynaDrawContext const *ddc, NR::Point n); static void draw_temporary_box(SPDynaDrawContext *dc); static SPEventContextClass *parent_class; GtkType sp_dyna_draw_context_get_type(void) { static GType type = 0; if (!type) { GTypeInfo info = { sizeof(SPDynaDrawContextClass), NULL, NULL, (GClassInitFunc) sp_dyna_draw_context_class_init, NULL, NULL, sizeof(SPDynaDrawContext), 4, (GInstanceInitFunc) sp_dyna_draw_context_init, NULL, /* value_table */ }; type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDynaDrawContext", &info, (GTypeFlags)0); } return type; } static void sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass) { GObjectClass *object_class = (GObjectClass *) klass; SPEventContextClass *event_context_class = (SPEventContextClass *) klass; parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass); object_class->dispose = sp_dyna_draw_context_dispose; event_context_class->setup = sp_dyna_draw_context_setup; event_context_class->set = sp_dyna_draw_context_set; event_context_class->root_handler = sp_dyna_draw_context_root_handler; } static void sp_dyna_draw_context_init(SPDynaDrawContext *ddc) { SPEventContext *event_context = SP_EVENT_CONTEXT(ddc); event_context->cursor_shape = cursor_calligraphy_xpm; event_context->hot_x = 4; event_context->hot_y = 4; ddc->accumulated = NULL; ddc->segments = NULL; ddc->currentcurve = NULL; ddc->currentshape = NULL; ddc->npoints = 0; ddc->cal1 = NULL; ddc->cal2 = NULL; ddc->repr = NULL; /* DynaDraw values */ ddc->cur = NR::Point(0,0); ddc->last = NR::Point(0,0); ddc->vel = NR::Point(0,0); ddc->vel_max = 0; ddc->acc = NR::Point(0,0); ddc->ang = NR::Point(0,0); ddc->del = NR::Point(0,0); /* attributes */ ddc->dragging = FALSE; ddc->mass = 0.3; ddc->drag = DRAG_DEFAULT; ddc->angle = 30.0; ddc->width = 0.2; ddc->vel_thin = 0.1; ddc->flatness = 0.9; ddc->cap_rounding = 0.0; ddc->abs_width = false; ddc->keep_selected = true; } static void sp_dyna_draw_context_dispose(GObject *object) { SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(object); if (ddc->accumulated) { ddc->accumulated = sp_curve_unref(ddc->accumulated); } while (ddc->segments) { gtk_object_destroy(GTK_OBJECT(ddc->segments->data)); ddc->segments = g_slist_remove(ddc->segments, ddc->segments->data); } if (ddc->currentcurve) ddc->currentcurve = sp_curve_unref(ddc->currentcurve); if (ddc->cal1) ddc->cal1 = sp_curve_unref(ddc->cal1); if (ddc->cal2) ddc->cal2 = sp_curve_unref(ddc->cal2); if (ddc->currentshape) { gtk_object_destroy(GTK_OBJECT(ddc->currentshape)); ddc->currentshape = NULL; } if (ddc->_message_context) { delete ddc->_message_context; } G_OBJECT_CLASS(parent_class)->dispose(object); } static void sp_dyna_draw_context_setup(SPEventContext *ec) { SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec); if (((SPEventContextClass *) parent_class)->setup) ((SPEventContextClass *) parent_class)->setup(ec); ddc->accumulated = sp_curve_new_sized(32); ddc->currentcurve = sp_curve_new_sized(4); ddc->cal1 = sp_curve_new_sized(32); ddc->cal2 = sp_curve_new_sized(32); ddc->currentshape = sp_canvas_item_new(sp_desktop_sketch(ec->desktop), SP_TYPE_CANVAS_BPATH, NULL); sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->currentshape), DDC_RED_RGBA, SP_WIND_RULE_EVENODD); sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->currentshape), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT); /* fixme: Cannot we cascade it to root more clearly? */ g_signal_connect(G_OBJECT(ddc->currentshape), "event", G_CALLBACK(sp_desktop_root_handler), ec->desktop); sp_event_context_read(ec, "mass"); sp_event_context_read(ec, "wiggle"); sp_event_context_read(ec, "angle"); sp_event_context_read(ec, "width"); sp_event_context_read(ec, "thinning"); sp_event_context_read(ec, "tremor"); sp_event_context_read(ec, "flatness"); sp_event_context_read(ec, "usepressure"); sp_event_context_read(ec, "usetilt"); sp_event_context_read(ec, "abs_width"); sp_event_context_read(ec, "keep_selected"); sp_event_context_read(ec, "cap_rounding"); ddc->is_drawing = false; ddc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack()); } static void sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val) { SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec); if (!strcmp(key, "mass")) { double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.2 ); ddc->mass = CLAMP(dval, -1000.0, 1000.0); } else if (!strcmp(key, "wiggle")) { double const dval = ( val ? g_ascii_strtod (val, NULL) : (1 - DRAG_DEFAULT)); ddc->drag = CLAMP((1 - dval), DRAG_MIN, DRAG_MAX); // drag is inverse to wiggle } else if (!strcmp(key, "angle")) { double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0); ddc->angle = CLAMP (dval, -90, 90); } else if (!strcmp(key, "width")) { double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 ); ddc->width = CLAMP(dval, -1000.0, 1000.0); } else if (!strcmp(key, "thinning")) { double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 ); ddc->vel_thin = CLAMP(dval, -1.0, 1.0); } else if (!strcmp(key, "tremor")) { double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0 ); ddc->tremor = CLAMP(dval, 0.0, 1.0); } else if (!strcmp(key, "flatness")) { double const dval = ( val ? g_ascii_strtod (val, NULL) : 1.0 ); ddc->flatness = CLAMP(dval, 0, 1.0); } else if (!strcmp(key, "usepressure")) { ddc->usepressure = (val && strcmp(val, "0")); } else if (!strcmp(key, "usetilt")) { ddc->usetilt = (val && strcmp(val, "0")); } else if (!strcmp(key, "abs_width")) { ddc->abs_width = (val && strcmp(val, "0")); } else if (!strcmp(key, "keep_selected")) { ddc->keep_selected = (val && strcmp(val, "0")); } else if (!strcmp(key, "cap_rounding")) { ddc->cap_rounding = ( val ? g_ascii_strtod (val, NULL) : 0.0 ); } //g_print("DDC: %g %g %g %g\n", ddc->mass, ddc->drag, ddc->angle, ddc->width); } static double flerp(double f0, double f1, double p) { return f0 + ( f1 - f0 ) * p; } /* Get normalized point */ static NR::Point sp_dyna_draw_get_npoint(SPDynaDrawContext const *dc, NR::Point v) { NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area(); double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] ); return NR::Point(( v[NR::X] - drect.min()[NR::X] ) / max, ( v[NR::Y] - drect.min()[NR::Y] ) / max); } /* Get view point */ static NR::Point sp_dyna_draw_get_vpoint(SPDynaDrawContext const *dc, NR::Point n) { NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area(); double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] ); return NR::Point(n[NR::X] * max + drect.min()[NR::X], n[NR::Y] * max + drect.min()[NR::Y]); } static void sp_dyna_draw_reset(SPDynaDrawContext *dc, NR::Point p) { dc->last = dc->cur = sp_dyna_draw_get_npoint(dc, p); dc->vel = NR::Point(0,0); dc->vel_max = 0; dc->acc = NR::Point(0,0); dc->ang = NR::Point(0,0); dc->del = NR::Point(0,0); } static void sp_dyna_draw_extinput(SPDynaDrawContext *dc, GdkEvent *event) { if (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &dc->pressure)) dc->pressure = CLAMP (dc->pressure, DDC_MIN_PRESSURE, DDC_MAX_PRESSURE); else dc->pressure = DDC_DEFAULT_PRESSURE; if (gdk_event_get_axis (event, GDK_AXIS_XTILT, &dc->xtilt)) dc->xtilt = CLAMP (dc->xtilt, DDC_MIN_TILT, DDC_MAX_TILT); else dc->xtilt = DDC_DEFAULT_TILT; if (gdk_event_get_axis (event, GDK_AXIS_YTILT, &dc->ytilt)) dc->ytilt = CLAMP (dc->ytilt, DDC_MIN_TILT, DDC_MAX_TILT); else dc->ytilt = DDC_DEFAULT_TILT; } static gboolean sp_dyna_draw_apply(SPDynaDrawContext *dc, NR::Point p) { NR::Point n = sp_dyna_draw_get_npoint(dc, p); /* Calculate mass and drag */ double const mass = flerp(1.0, 160.0, dc->mass); double const drag = flerp(0.0, 0.5, dc->drag * dc->drag); /* Calculate force and acceleration */ NR::Point force = n - dc->cur; if ( NR::L2(force) < DYNA_EPSILON || (dc->vel_max < DYNA_VEL_START && NR::L2(force) < DYNA_EPSILON_START)) { return FALSE; } dc->acc = force / mass; /* Calculate new velocity */ dc->vel += dc->acc; if (NR::L2(dc->vel) > dc->vel_max) dc->vel_max = NR::L2(dc->vel); /* Calculate angle of drawing tool */ double a1; if (dc->usetilt) { // 1a. calculate nib angle from input device tilt: gdouble length = std::sqrt(dc->xtilt*dc->xtilt + dc->ytilt*dc->ytilt);; if (length > 0) { NR::Point ang1 = NR::Point(dc->ytilt/length, dc->xtilt/length); a1 = atan2(ang1); } else a1 = 0.0; } else { // 1b. fixed dc->angle (absolutely flat nib): double const radians = ( (dc->angle - 90) / 180.0 ) * M_PI; NR::Point ang1 = NR::Point(-sin(radians), cos(radians)); a1 = atan2(ang1); } // 2. perpendicular to dc->vel (absolutely non-flat nib): gdouble const mag_vel = NR::L2(dc->vel); if ( mag_vel < DYNA_EPSILON ) { return FALSE; } NR::Point ang2 = NR::rot90(dc->vel) / mag_vel; // 3. Average them using flatness parameter: // calculate angles double a2 = atan2(ang2); // flip a2 to force it to be in the same half-circle as a1 bool flipped = false; if (fabs (a2-a1) > 0.5*M_PI) { a2 += M_PI; flipped = true; } // normalize a2 if (a2 > M_PI) a2 -= 2*M_PI; if (a2 < -M_PI) a2 += 2*M_PI; // find the flatness-weighted bisector angle, unflip if a2 was flipped // FIXME: when dc->vel is oscillating around the fixed angle, the new_ang flips back and forth. How to avoid this? double new_ang = a1 + (1 - dc->flatness) * (a2 - a1) - (flipped? M_PI : 0); double angle_delta = NR::L2(NR::Point (cos (new_ang), sin (new_ang)) - dc->ang); if ( angle_delta / NR::L2(dc->vel) > 4000 ) { return FALSE; } // convert to point dc->ang = NR::Point (cos (new_ang), sin (new_ang)); // 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); /* Apply drag */ dc->vel *= 1.0 - drag; /* Update position */ dc->last = dc->cur; dc->cur += dc->vel; return TRUE; } static void sp_dyna_draw_brush(SPDynaDrawContext *dc) { g_assert( dc->npoints >= 0 && dc->npoints < SAMPLING_SIZE ); // How much velocity thins strokestyle double vel_thin = flerp (0, 160, dc->vel_thin); // Influence of pressure on thickness double pressure_thick = (dc->usepressure ? dc->pressure : 1.0); double width = ( pressure_thick - vel_thin * NR::L2(dc->vel) ) * dc->width; double tremble_left = 0, tremble_right = 0; if (dc->tremor > 0) { // obtain two normally distributed random variables, using polar Box-Muller transform double x1, x2, w, y1, y2; do { x1 = 2.0 * g_random_double_range(0,1) - 1.0; x2 = 2.0 * g_random_double_range(0,1) - 1.0; w = x1 * x1 + x2 * x2; } while ( w >= 1.0 ); w = sqrt( (-2.0 * log( w ) ) / w ); y1 = x1 * w; y2 = x2 * w; // deflect both left and right edges randomly and independently, so that: // (1) dc->tremor=1 corresponds to sigma=1, decreasing dc->tremor narrows the bell curve; // (2) deflection depends on width, but is upped for small widths for better visual uniformity across widths; // (3) deflection somewhat depends on speed, to prevent fast strokes looking // comparatively smooth and slow ones excessively jittery tremble_left = (y1)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel)); tremble_right = (y2)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel)); } if ( width < 0.02 * dc->width ) { width = 0.02 * dc->width; } double dezoomify_factor = 0.05 * 1000; if (!dc->abs_width) { dezoomify_factor /= SP_EVENT_CONTEXT(dc)->desktop->current_zoom(); } NR::Point del_left = dezoomify_factor * (width + tremble_left) * dc->ang; NR::Point del_right = dezoomify_factor * (width + tremble_right) * dc->ang; NR::Point abs_middle = sp_dyna_draw_get_vpoint(dc, dc->cur); dc->point1[dc->npoints] = abs_middle + del_left; dc->point2[dc->npoints] = abs_middle - del_right; dc->del = 0.5*(del_left + del_right); dc->npoints++; } void sp_ddc_update_toolbox (SPDesktop *desktop, const gchar *id, double value) { desktop->setToolboxAdjustmentValue (id, value); } static void calligraphic_cancel(SPDynaDrawContext *dc) { SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop; dc->dragging = FALSE; dc->is_drawing = false; sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), 0); /* Remove all temporary line segments */ while (dc->segments) { gtk_object_destroy(GTK_OBJECT(dc->segments->data)); dc->segments = g_slist_remove(dc->segments, dc->segments->data); } /* reset accumulated curve */ sp_curve_reset(dc->accumulated); clear_current(dc); if (dc->repr) { dc->repr = NULL; } } gint sp_dyna_draw_context_root_handler(SPEventContext *event_context, GdkEvent *event) { SPDynaDrawContext *dc = SP_DYNA_DRAW_CONTEXT(event_context); SPDesktop *desktop = event_context->desktop; gint ret = FALSE; switch (event->type) { case GDK_BUTTON_PRESS: if ( event->button.button == 1 ) { SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc); if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) { return TRUE; } NR::Point const button_w(event->button.x, event->button.y); NR::Point const button_dt(desktop->w2d(button_w)); sp_dyna_draw_reset(dc, button_dt); sp_dyna_draw_extinput(dc, event); sp_dyna_draw_apply(dc, button_dt); sp_curve_reset(dc->accumulated); if (dc->repr) { dc->repr = NULL; } /* initialize first point */ dc->npoints = 0; sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate), ( GDK_KEY_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK | GDK_BUTTON_PRESS_MASK ), NULL, event->button.time); ret = TRUE; dc->is_drawing = true; } break; case GDK_MOTION_NOTIFY: if ( dc->is_drawing && ( event->motion.state & GDK_BUTTON1_MASK ) ) { dc->dragging = TRUE; NR::Point const motion_w(event->motion.x, event->motion.y); NR::Point const motion_dt(desktop->w2d(motion_w)); sp_dyna_draw_extinput(dc, event); if (!sp_dyna_draw_apply(dc, motion_dt)) { ret = TRUE; break; } if ( dc->cur != dc->last ) { sp_dyna_draw_brush(dc); g_assert( dc->npoints > 0 ); fit_and_split(dc, FALSE); } ret = TRUE; } break; case GDK_BUTTON_RELEASE: sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time); dc->is_drawing = false; if ( dc->dragging && event->button.button == 1 ) { dc->dragging = FALSE; NR::Point const motion_w(event->button.x, event->button.y); NR::Point const motion_dt(desktop->w2d(motion_w)); sp_dyna_draw_apply(dc, motion_dt); /* Remove all temporary line segments */ while (dc->segments) { gtk_object_destroy(GTK_OBJECT(dc->segments->data)); dc->segments = g_slist_remove(dc->segments, dc->segments->data); } /* Create object */ fit_and_split(dc, TRUE); accumulate_calligraphic(dc); set_to_accumulated(dc); /* temporal implementation */ /* reset accumulated curve */ sp_curve_reset(dc->accumulated); clear_current(dc); if (dc->repr) { dc->repr = NULL; } ret = TRUE; } break; case GDK_KEY_PRESS: switch (get_group0_keyval (&event->key)) { case GDK_Up: case GDK_KP_Up: if (!MOD__CTRL_ONLY) { dc->angle += 5.0; if (dc->angle > 90.0) dc->angle = 90.0; sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle); ret = TRUE; } break; case GDK_Down: case GDK_KP_Down: if (!MOD__CTRL_ONLY) { dc->angle -= 5.0; if (dc->angle < -90.0) dc->angle = -90.0; sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle); ret = TRUE; } break; case GDK_Right: case GDK_KP_Right: if (!MOD__CTRL_ONLY) { dc->width += 0.01; if (dc->width > 1.0) dc->width = 1.0; sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100); // the same spinbutton is for alt+x ret = TRUE; } break; case GDK_Left: case GDK_KP_Left: if (!MOD__CTRL_ONLY) { dc->width -= 0.01; if (dc->width < 0.01) dc->width = 0.01; sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100); ret = TRUE; } break; case GDK_x: case GDK_X: if (MOD__ALT_ONLY) { desktop->setToolboxFocusTo ("altx-calligraphy"); ret = TRUE; } break; case GDK_Escape: if (dc->is_drawing) { // if drawing, cancel, otherwise pass it up for deselecting calligraphic_cancel (dc); ret = TRUE; } break; case GDK_z: case GDK_Z: if (MOD__CTRL_ONLY && dc->is_drawing) { // if drawing, cancel, otherwise pass it up for undo calligraphic_cancel (dc); ret = TRUE; } break; default: break; } default: break; } if (!ret) { if (((SPEventContextClass *) parent_class)->root_handler) { ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event); } } return ret; } static void clear_current(SPDynaDrawContext *dc) { /* reset bpath */ sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), NULL); /* reset curve */ sp_curve_reset(dc->currentcurve); sp_curve_reset(dc->cal1); sp_curve_reset(dc->cal2); /* reset points */ dc->npoints = 0; } static void set_to_accumulated(SPDynaDrawContext *dc) { SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop; if (!sp_curve_empty(dc->accumulated)) { NArtBpath *abp; gchar *str; if (!dc->repr) { /* Create object */ Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc()); Inkscape::XML::Node *repr = xml_doc->createElement("svg:path"); /* Set style */ sp_desktop_apply_style_tool (desktop, repr, "tools.calligraphic", false); dc->repr = repr; SPItem *item=SP_ITEM(desktop->currentLayer()->appendChildRepr(dc->repr)); Inkscape::GC::release(dc->repr); item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer()); item->updateRepr(); if (dc->keep_selected) { sp_desktop_selection(desktop)->set(dc->repr); } else { sp_desktop_selection(desktop)->clear(); } } abp = nr_artpath_affine(sp_curve_first_bpath(dc->accumulated), sp_desktop_dt2root_affine(desktop)); str = sp_svg_write_path(abp); g_assert( str != NULL ); g_free(abp); dc->repr->setAttribute("d", str); g_free(str); } else { if (dc->repr) { sp_repr_unparent(dc->repr); } dc->repr = NULL; } sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_CALLIGRAPHIC, _("Create calligraphic stroke")); } static void add_cap(SPCurve *curve, NR::Point const &pre, NR::Point const &from, NR::Point const &to, NR::Point const &post, double rounding) { NR::Point vel = rounding * NR::rot90( to - from ) / sqrt(2.0); double mag = NR::L2(vel); NR::Point v_in = from - pre; double mag_in = NR::L2(v_in); if ( mag_in > DYNA_EPSILON ) { v_in = mag * v_in / mag_in; } else { v_in = NR::Point(0, 0); } NR::Point v_out = to - post; double mag_out = NR::L2(v_out); if ( mag_out > DYNA_EPSILON ) { v_out = mag * v_out / mag_out; } else { v_out = NR::Point(0, 0); } if ( NR::L2(v_in) > DYNA_EPSILON || NR::L2(v_out) > DYNA_EPSILON ) { sp_curve_curveto(curve, from + v_in, to + v_out, to); } } static void accumulate_calligraphic(SPDynaDrawContext *dc) { if ( !sp_curve_empty(dc->cal1) && !sp_curve_empty(dc->cal2) ) { sp_curve_reset(dc->accumulated); /* Is this required ?? */ SPCurve *rev_cal2 = sp_curve_reverse(dc->cal2); g_assert(dc->cal1->end > 1); g_assert(rev_cal2->end > 1); g_assert(SP_CURVE_SEGMENT(dc->cal1, 0)->code == NR_MOVETO_OPEN); g_assert(SP_CURVE_SEGMENT(rev_cal2, 0)->code == NR_MOVETO_OPEN); g_assert(SP_CURVE_SEGMENT(dc->cal1, 1)->code == NR_CURVETO); g_assert(SP_CURVE_SEGMENT(rev_cal2, 1)->code == NR_CURVETO); g_assert(SP_CURVE_SEGMENT(dc->cal1, dc->cal1->end-1)->code == NR_CURVETO); g_assert(SP_CURVE_SEGMENT(rev_cal2, rev_cal2->end-1)->code == NR_CURVETO); sp_curve_append(dc->accumulated, dc->cal1, FALSE); 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); sp_curve_append(dc->accumulated, rev_cal2, TRUE); 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); sp_curve_closepath(dc->accumulated); sp_curve_unref(rev_cal2); sp_curve_reset(dc->cal1); sp_curve_reset(dc->cal2); } } static double square(double const x) { return x * x; } static void fit_and_split(SPDynaDrawContext *dc, gboolean release) { double const tolerance_sq = square( NR::expansion(SP_EVENT_CONTEXT(dc)->desktop->w2d()) * TOLERANCE_CALLIGRAPHIC ); #ifdef DYNA_DRAW_VERBOSE g_print("[F&S:R=%c]", release?'T':'F'); #endif if (!( dc->npoints > 0 && dc->npoints < SAMPLING_SIZE )) return; // just clicked if ( dc->npoints == SAMPLING_SIZE - 1 || release ) { #define BEZIER_SIZE 4 #define BEZIER_MAX_BEZIERS 8 #define BEZIER_MAX_LENGTH ( BEZIER_SIZE * BEZIER_MAX_BEZIERS ) #ifdef DYNA_DRAW_VERBOSE g_print("[F&S:#] dc->npoints:%d, release:%s\n", dc->npoints, release ? "TRUE" : "FALSE"); #endif /* Current calligraphic */ if ( dc->cal1->end == 0 || dc->cal2->end == 0 ) { /* dc->npoints > 0 */ /* g_print("calligraphics(1|2) reset\n"); */ sp_curve_reset(dc->cal1); sp_curve_reset(dc->cal2); sp_curve_moveto(dc->cal1, dc->point1[0]); sp_curve_moveto(dc->cal2, dc->point2[0]); } NR::Point b1[BEZIER_MAX_LENGTH]; gint const nb1 = sp_bezier_fit_cubic_r(b1, dc->point1, dc->npoints, tolerance_sq, BEZIER_MAX_BEZIERS); g_assert( nb1 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b1)) ); NR::Point b2[BEZIER_MAX_LENGTH]; gint const nb2 = sp_bezier_fit_cubic_r(b2, dc->point2, dc->npoints, tolerance_sq, BEZIER_MAX_BEZIERS); g_assert( nb2 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b2)) ); if ( nb1 != -1 && nb2 != -1 ) { /* Fit and draw and reset state */ #ifdef DYNA_DRAW_VERBOSE g_print("nb1:%d nb2:%d\n", nb1, nb2); #endif /* CanvasShape */ if (! release) { sp_curve_reset(dc->currentcurve); sp_curve_moveto(dc->currentcurve, b1[0]); for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) { sp_curve_curveto(dc->currentcurve, bp1[1], bp1[2], bp1[3]); } sp_curve_lineto(dc->currentcurve, b2[BEZIER_SIZE*(nb2-1) + 3]); for (NR::Point *bp2 = b2 + BEZIER_SIZE * ( nb2 - 1 ); bp2 >= b2; bp2 -= BEZIER_SIZE) { sp_curve_curveto(dc->currentcurve, bp2[2], bp2[1], bp2[0]); } // FIXME: dc->segments is always NULL at this point?? if (!dc->segments) { // first segment add_cap(dc->currentcurve, b2[1], b2[0], b1[0], b1[1], dc->cap_rounding); } sp_curve_closepath(dc->currentcurve); sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve); } /* Current calligraphic */ for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) { sp_curve_curveto(dc->cal1, bp1[1], bp1[2], bp1[3]); } for (NR::Point *bp2 = b2; bp2 < b2 + BEZIER_SIZE * nb2; bp2 += BEZIER_SIZE) { sp_curve_curveto(dc->cal2, bp2[1], bp2[2], bp2[3]); } } else { /* fixme: ??? */ #ifdef DYNA_DRAW_VERBOSE g_print("[fit_and_split] failed to fit-cubic.\n"); #endif draw_temporary_box(dc); for (gint i = 1; i < dc->npoints; i++) { sp_curve_lineto(dc->cal1, dc->point1[i]); } for (gint i = 1; i < dc->npoints; i++) { sp_curve_lineto(dc->cal2, dc->point2[i]); } } /* Fit and draw and copy last point */ #ifdef DYNA_DRAW_VERBOSE g_print("[%d]Yup\n", dc->npoints); #endif if (!release) { g_assert(!sp_curve_empty(dc->currentcurve)); SPCanvasItem *cbp = sp_canvas_item_new(sp_desktop_sketch(SP_EVENT_CONTEXT(dc)->desktop), SP_TYPE_CANVAS_BPATH, NULL); SPCurve *curve = sp_curve_copy(dc->currentcurve); sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH (cbp), curve); sp_curve_unref(curve); guint32 fillColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", true); //guint32 strokeColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", false); double opacity = sp_desktop_get_master_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic"); double fillOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", true); //double strokeOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", false); sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cbp), ((fillColor & 0xffffff00) | SP_COLOR_F_TO_U(opacity*fillOpacity)), SP_WIND_RULE_EVENODD); //on second thougtht don't do stroke yet because we don't have stoke-width yet and because stoke appears between segments while drawing //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); sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT); /* fixme: Cannot we cascade it to root more clearly? */ g_signal_connect(G_OBJECT(cbp), "event", G_CALLBACK(sp_desktop_root_handler), SP_EVENT_CONTEXT(dc)->desktop); dc->segments = g_slist_prepend(dc->segments, cbp); } dc->point1[0] = dc->point1[dc->npoints - 1]; dc->point2[0] = dc->point2[dc->npoints - 1]; dc->npoints = 1; } else { draw_temporary_box(dc); } } static void draw_temporary_box(SPDynaDrawContext *dc) { sp_curve_reset(dc->currentcurve); sp_curve_moveto(dc->currentcurve, dc->point1[dc->npoints-1]); for (gint i = dc->npoints-2; i >= 0; i--) { sp_curve_lineto(dc->currentcurve, dc->point1[i]); } for (gint i = 0; i < dc->npoints; i++) { sp_curve_lineto(dc->currentcurve, dc->point2[i]); } if (dc->npoints >= 2) { 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); } sp_curve_closepath(dc->currentcurve); sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve); } /* 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:encoding=utf-8:textwidth=99 :