From 090f793a8a0366a90c96bd4ae509ac7315ec8391 Mon Sep 17 00:00:00 2001 From: buliabyak Date: Wed, 11 Apr 2007 03:23:46 +0000 Subject: [PATCH] tracking guide with ctrl; tracing background; thinning/thickening with alt; also home/end for width, shift+drawing to unionize, decrease tolerance, add comments --- src/dyna-draw-context.cpp | 694 ++++++++++++++++++++++++++++++++++---- src/dyna-draw-context.h | 15 + 2 files changed, 647 insertions(+), 62 deletions(-) diff --git a/src/dyna-draw-context.cpp b/src/dyna-draw-context.cpp index ba44df3ce..d1966d248 100644 --- a/src/dyna-draw-context.cpp +++ b/src/dyna-draw-context.cpp @@ -15,7 +15,7 @@ * 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) 2005-2007 bulia byak * Copyright (C) 2006 MenTaLguY * * Released under GNU GPL, read the file 'COPYING' for more information @@ -29,6 +29,8 @@ #include #include +#include + #include "svg/svg.h" #include "display/canvas-bpath.h" #include "display/bezier-utils.h" @@ -44,20 +46,31 @@ #include "desktop-style.h" #include "message-context.h" #include "pixmaps/cursor-calligraphy.xpm" -#include "dyna-draw-context.h" +#include "pixmaps/cursor-thin.xpm" +#include "pixmaps/cursor-thicken.xpm" #include "libnr/n-art-bpath.h" #include "libnr/nr-path.h" +#include "libnr/nr-matrix-ops.h" +#include "libnr/nr-scale-translate-ops.h" #include "xml/repr.h" #include "context-fns.h" #include "sp-item.h" #include "inkscape.h" #include "color.h" +#include "splivarot.h" +#include "sp-shape.h" +#include "sp-path.h" +#include "sp-text.h" +#include "display/canvas-bpath.h" +#include "display/canvas-arena.h" +#include "livarot/Shape.h" +#include "isnan.h" + +#include "dyna-draw-context.h" #define DDC_RED_RGBA 0xff0000ff -#define SAMPLE_TIMEOUT 10 -#define TOLERANCE_LINE 1.0 -#define TOLERANCE_CALLIGRAPHIC 3.0 +#define TOLERANCE_CALLIGRAPHIC 0.1 #define DYNA_EPSILON 0.5e-6 #define DYNA_EPSILON_START 0.5e-2 @@ -69,6 +82,19 @@ #define DRAG_DEFAULT 1.0 #define DRAG_MAX 1.0 +// FIXME: move it to some shared file to be reused by both calligraphy and dropper +#define C1 0.552 +static NArtBpath const hatch_area_circle[] = { + { NR_MOVETO, 0, 0, 0, 0, -1, 0 }, + { NR_CURVETO, -1, C1, -C1, 1, 0, 1 }, + { NR_CURVETO, C1, 1, 1, C1, 1, 0 }, + { NR_CURVETO, 1, -C1, C1, -1, 0, -1 }, + { NR_CURVETO, -C1, -1, -1, -C1, -1, 0 }, + { NR_END, 0, 0, 0, 0, 0, 0 } +}; +#undef C1 + + 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); @@ -78,7 +104,7 @@ static void sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar 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 set_to_accumulated(SPDynaDrawContext *dc, bool unionize); 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); @@ -161,6 +187,7 @@ sp_dyna_draw_context_init(SPDynaDrawContext *ddc) ddc->drag = DRAG_DEFAULT; ddc->angle = 30.0; ddc->width = 0.2; + ddc->pressure = DDC_DEFAULT_PRESSURE; ddc->vel_thin = 0.1; ddc->flatness = 0.9; @@ -168,6 +195,21 @@ sp_dyna_draw_context_init(SPDynaDrawContext *ddc) ddc->abs_width = false; ddc->keep_selected = true; + + ddc->hatch_spacing = 0; + new (&ddc->hatch_pointer_past) std::list(); + new (&ddc->hatch_nearest_past) std::list(); + ddc->hatch_last_nearest = NR::Point(0,0); + ddc->hatch_last_pointer = NR::Point(0,0); + ddc->hatch_vector_accumulated = NR::Point(0,0); + ddc->hatch_escaped = false; + ddc->hatch_area = NULL; + ddc->hatch_item = NULL; + ddc->hatch_livarot_path = NULL; + + ddc->trace_bg = false; + + ddc->is_dilating = false; } static void @@ -175,6 +217,16 @@ sp_dyna_draw_context_dispose(GObject *object) { SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(object); + if (ddc->hatch_area) { + gtk_object_destroy(GTK_OBJECT(ddc->hatch_area)); + ddc->hatch_area = NULL; + } + + if (ddc->dilate_area) { + gtk_object_destroy(GTK_OBJECT(ddc->dilate_area)); + ddc->dilate_area = NULL; + } + if (ddc->accumulated) { ddc->accumulated = sp_curve_unref(ddc->accumulated); } @@ -198,6 +250,9 @@ sp_dyna_draw_context_dispose(GObject *object) } G_OBJECT_CLASS(parent_class)->dispose(object); + + ddc->hatch_pointer_past.~list(); + ddc->hatch_nearest_past.~list(); } static void @@ -220,6 +275,24 @@ sp_dyna_draw_context_setup(SPEventContext *ec) /* 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); + { + SPCurve *c = sp_curve_new_from_foreign_bpath(hatch_area_circle); + ddc->hatch_area = sp_canvas_bpath_new(sp_desktop_controls(ec->desktop), c); + sp_curve_unref(c); + sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->hatch_area), 0x00000000,(SPWindRule)0); + sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->hatch_area), 0x0000007f, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT); + sp_canvas_item_hide(ddc->hatch_area); + } + + { + SPCurve *c = sp_curve_new_from_foreign_bpath(hatch_area_circle); + ddc->dilate_area = sp_canvas_bpath_new(sp_desktop_controls(ec->desktop), c); + sp_curve_unref(c); + sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->dilate_area), 0x00000000,(SPWindRule)0); + sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->dilate_area), 0xff9900ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT); + sp_canvas_item_hide(ddc->dilate_area); + } + sp_event_context_read(ec, "mass"); sp_event_context_read(ec, "wiggle"); sp_event_context_read(ec, "angle"); @@ -227,6 +300,7 @@ sp_dyna_draw_context_setup(SPEventContext *ec) sp_event_context_read(ec, "thinning"); sp_event_context_read(ec, "tremor"); sp_event_context_read(ec, "flatness"); + sp_event_context_read(ec, "tracebackground"); sp_event_context_read(ec, "usepressure"); sp_event_context_read(ec, "usetilt"); sp_event_context_read(ec, "abs_width"); @@ -264,6 +338,8 @@ sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val) } 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, "tracebackground")) { + ddc->trace_bg = (val && strcmp(val, "0")); } else if (!strcmp(key, "usepressure")) { ddc->usepressure = (val && strcmp(val, "0")); } else if (!strcmp(key, "usetilt")) { @@ -345,6 +421,14 @@ sp_dyna_draw_apply(SPDynaDrawContext *dc, NR::Point p) /* Calculate force and acceleration */ NR::Point force = n - dc->cur; + + // If force is below the absolute threshold DYNA_EPSILON, + // or we haven't yet reached DYNA_VEL_START (i.e. at the beginning of stroke) + // _and_ the force is below the (higher) DYNA_EPSILON_START threshold, + // discard this move. + // This prevents flips, blobs, and jerks caused by microscopic tremor of the tablet pen, + // especially bothersome at the start of the stroke where we don't yet have the inertia to + // smooth them out. if ( NR::L2(force) < DYNA_EPSILON || (dc->vel_max < DYNA_VEL_START && NR::L2(force) < DYNA_EPSILON_START)) { return FALSE; } @@ -403,8 +487,9 @@ sp_dyna_draw_apply(SPDynaDrawContext *dc, NR::Point p) // 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); + // Try to detect a sudden flip when the new angle differs too much from the previous for the + // current velocity; in that case discard this move 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; } @@ -435,7 +520,32 @@ sp_dyna_draw_brush(SPDynaDrawContext *dc) // 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; + // get the real brush point, not the same as pointer (affected by hatch tracking and/or mass + // drag) + NR::Point brush = sp_dyna_draw_get_vpoint(dc, dc->cur); + NR::Point brush_w = SP_EVENT_CONTEXT(dc)->desktop->d2w(brush); + + double trace_thick = 1; + if (dc->trace_bg) { + // pick single pixel + NRPixBlock pb; + int x = (int) floor(brush_w[NR::X]); + int y = (int) floor(brush_w[NR::Y]); + nr_pixblock_setup_fast(&pb, NR_PIXBLOCK_MODE_R8G8B8A8P, x, y, x+1, y+1, TRUE); + sp_canvas_arena_render_pixblock(SP_CANVAS_ARENA(sp_desktop_drawing(SP_EVENT_CONTEXT(dc)->desktop)), &pb); + const unsigned char *s = NR_PIXBLOCK_PX(&pb); + double R = s[0] / 255.0; + double G = s[1] / 255.0; + double B = s[2] / 255.0; + double A = s[3] / 255.0; + double max = MAX (MAX (R, G), B); + double min = MIN (MIN (R, G), B); + double L = A * (max + min)/2 + (1 - A); // blend with white bg + trace_thick = 1 - L; + //g_print ("L %g thick %g\n", L, trace_thick); + } + + double width = (pressure_thick * trace_thick - vel_thin * NR::L2(dc->vel)) * dc->width; double tremble_left = 0, tremble_right = 0; if (dc->tremor > 0) { @@ -471,16 +581,152 @@ sp_dyna_draw_brush(SPDynaDrawContext *dc) 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->point1[dc->npoints] = brush + del_left; + dc->point2[dc->npoints] = brush - del_right; dc->del = 0.5*(del_left + del_right); dc->npoints++; } +double +get_dilate_radius (SPDynaDrawContext *dc) +{ + // 10 times the pen width: + return 500 * dc->width/SP_EVENT_CONTEXT(dc)->desktop->current_zoom(); +} + +double +get_dilate_force (SPDynaDrawContext *dc) +{ + return 8 * dc->pressure/SP_EVENT_CONTEXT(dc)->desktop->current_zoom(); +} + +bool +sp_ddc_dilate (SPDynaDrawContext *dc, NR::Point p, bool expand) +{ + Inkscape::Selection *selection = sp_desktop_selection(SP_EVENT_CONTEXT(dc)->desktop); + + if (selection->isEmpty()) { + return false; + } + + bool did = false; + double radius = get_dilate_radius(dc); + double offset = get_dilate_force(dc); + + for (GSList *items = g_slist_copy((GSList *) selection->itemList()); + items != NULL; + items = items->next) { + + SPItem *item = (SPItem *) items->data; + + // only paths + if (!SP_IS_PATH(item)) + continue; + + SPCurve *curve = NULL; + curve = sp_shape_get_curve(SP_SHAPE(item)); + if (curve == NULL) + continue; + + // skip those paths whose bboxes are entirely out of reach with our radius + NR::Maybe bbox = item->getBounds(sp_item_i2doc_affine(item)); + if (bbox) { + bbox->growBy(radius); + if (!bbox->contains(p)) { + continue; + } + } + + Path *orig = Path_for_item(item, false); + if (orig == NULL) { + sp_curve_unref(curve); + continue; + } + Path *res = new Path; + res->SetBackData(false); + + Shape *theShape = new Shape; + Shape *theRes = new Shape; + + orig->ConvertWithBackData(0.05); + orig->Fill(theShape, 0); + + SPCSSAttr *css = sp_repr_css_attr(SP_OBJECT_REPR(item), "style"); + gchar const *val = sp_repr_css_property(css, "fill-rule", NULL); + if (val && strcmp(val, "nonzero") == 0) + { + theRes->ConvertToShape(theShape, fill_nonZero); + } + else if (val && strcmp(val, "evenodd") == 0) + { + theRes->ConvertToShape(theShape, fill_oddEven); + } + else + { + theRes->ConvertToShape(theShape, fill_nonZero); + } + + bool did_this = false; + if (theShape->MakeOffset(theRes, + expand? offset : -offset, + join_straight, butt_straight, + true, p[NR::X], p[NR::Y], radius) == 0) // 0 means the shape was actually changed + did_this = true; + + // the rest only makes sense if we actually changed the path + if (did_this) { + theRes->ConvertToShape(theShape, fill_positive); + + res->Reset(); + theRes->ConvertToForme(res); + + if (offset >= 0.5) + { + res->ConvertEvenLines(0.5); + res->Simplify(0.5); + } + else + { + res->ConvertEvenLines(0.5*offset); + res->Simplify(0.5 * offset); + } + + sp_curve_unref(curve); + if (res->descr_cmd.size() > 1) { + gchar *str = res->svg_dump_path(); + SP_OBJECT_REPR(item)->setAttribute("d", str); + g_free(str); + } else { + // TODO: if there's 0 or 1 node left, delete this path altogether + } + } + + delete theShape; + delete theRes; + delete orig; + delete res; + + if (did_this) + did = true; + } + + return did; +} + +void +sp_ddc_update_cursors (SPDynaDrawContext *dc) +{ + if (dc->is_dilating) { + double radius = get_dilate_radius(dc); + NR::Matrix const sm (NR::scale(radius, radius) * NR::translate(SP_EVENT_CONTEXT(dc)->desktop->point())); + sp_canvas_item_affine_absolute(dc->dilate_area, sm); + sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0xff9900ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT); + sp_canvas_item_show(dc->dilate_area); + } +} + void sp_ddc_update_toolbox (SPDesktop *desktop, const gchar *id, double value) { @@ -518,70 +764,304 @@ sp_dyna_draw_context_root_handler(SPEventContext *event_context, gint ret = FALSE; switch (event->type) { - case GDK_BUTTON_PRESS: - if ( event->button.button == 1 ) { + case GDK_BUTTON_PRESS: + if ( event->button.button == 1 ) { - SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc); + SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc); - if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) { - return TRUE; + 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: + { + NR::Point const motion_w(event->motion.x, + event->motion.y); + NR::Point motion_dt(desktop->w2d(motion_w)); + + // draw the dilating cursor + if (event->motion.state & GDK_MOD1_MASK) { + double radius = get_dilate_radius(dc); + NR::Matrix const sm (NR::scale(radius, radius) * NR::translate(desktop->w2d(motion_w))); + sp_canvas_item_affine_absolute(dc->dilate_area, sm); + sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0xff9900ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT); + sp_canvas_item_show(dc->dilate_area); + + guint num = 0; + if (!desktop->selection->isEmpty()) { + num = g_slist_length((GSList *) desktop->selection->itemList()); + } + if (num == 0) { + dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("Select paths to thin or thicken")); + } else { + dc->_message_context->setF(Inkscape::NORMAL_MESSAGE, + event->motion.state & GDK_SHIFT_MASK? + _("Thickening %d selected paths; without Shift to thin") : + _("Thinning %d selected paths; with Shift to thicken"), num); + } - 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; + } else { + dc->_message_context->clear(); + sp_canvas_item_hide(dc->dilate_area); } - /* initialize first point */ - dc->npoints = 0; + // dilating: + if (dc->is_drawing && ( event->motion.state & GDK_BUTTON1_MASK ) && event->motion.state & GDK_MOD1_MASK) { + sp_ddc_dilate (dc, desktop->dt2doc(motion_dt), event->motion.state & GDK_SHIFT_MASK? true : false); + dc->is_dilating = true; + // it's slow, so prevent clogging up with events + gobble_motion_events(GDK_BUTTON1_MASK); + return TRUE; + } - 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; + // for hatching: + double hatch_dist = 0; + NR::Point hatch_unit_vector(0,0); + NR::Point nearest(0,0); + NR::Point pointer(0,0); + NR::Matrix motion_to_curve(NR::identity()); - dc->is_drawing = true; - } - break; - case GDK_MOTION_NOTIFY: - if ( dc->is_drawing && ( event->motion.state & GDK_BUTTON1_MASK ) ) { - dc->dragging = TRUE; + if (event->motion.state & GDK_CONTROL_MASK) { // hatching - sense the item + + SPItem *selected = sp_desktop_selection(desktop)->singleItem(); + if (selected && (SP_IS_SHAPE(selected) || SP_IS_TEXT(selected))) { + // One item selected, and it's a path; + // let's try to track it as a guide + + if (selected != dc->hatch_item) { + dc->hatch_item = selected; + if (dc->hatch_livarot_path) + delete dc->hatch_livarot_path; + dc->hatch_livarot_path = Path_for_item (dc->hatch_item, true, true); + dc->hatch_livarot_path->ConvertWithBackData(0.01); + } + + // calculate pointer point in the guide item's coords + motion_to_curve = sp_item_dt2i_affine(selected) * sp_item_i2doc_affine(selected); + pointer = motion_dt * motion_to_curve; + + // calculate the nearest point on the guide path + NR::Maybe position = get_nearest_position_on_Path(dc->hatch_livarot_path, pointer); + nearest = get_point_on_Path(dc->hatch_livarot_path, position->piece, position->t); - 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)) { + // distance from pointer to nearest + hatch_dist = NR::L2(pointer - nearest); + // unit-length vector + hatch_unit_vector = (pointer - nearest)/hatch_dist; + + dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("Guide path selected; start drawing along the guide with Ctrl")); + } else { + dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("Select a guide path to track with Ctrl")); + } + } + + if ( dc->is_drawing && ( event->motion.state & GDK_BUTTON1_MASK ) ) { + dc->dragging = TRUE; + + if (event->motion.state & GDK_CONTROL_MASK && dc->hatch_item) { // hatching + +#define SPEED_ELEMENTS 12 +#define SPEED_MIN 0.12 +#define SPEED_NORMAL 0.65 + + // speed is the movement of the nearest point along the guide path, divided by + // the movement of the pointer at the same period; it is averaged for the last + // SPEED_ELEMENTS motion events. Normally, as you track the guide path, speed + // is about 1, i.e. the nearest point on the path is moved by about the same + // distance as the pointer. If the speed starts to decrease, we are losing + // contact with the guide; if it drops below SPEED_MIN, we are on our own and + // not attracted to guide anymore. Most often this happens when you have + // tracked to the end of a guide calligraphic stroke and keep moving + // further. We try to handle this situation gracefully: not stick with the + // guide forever but let go of it smoothly and without sharp jerks (non-zero + // mass recommended; with zero mass, jerks are still quite noticeable). + + double speed = 1; + if (NR::L2(dc->hatch_last_nearest) != 0) { + // the distance nearest moved since the last motion event + double nearest_moved = NR::L2(nearest - dc->hatch_last_nearest); + // the distance pointer moved since the last motion event + double pointer_moved = NR::L2(pointer - dc->hatch_last_pointer); + // store them in stacks limited to SPEED_ELEMENTS + dc->hatch_nearest_past.push_front(nearest_moved); + if (dc->hatch_nearest_past.size() > SPEED_ELEMENTS) + dc->hatch_nearest_past.pop_back(); + dc->hatch_pointer_past.push_front(pointer_moved); + if (dc->hatch_pointer_past.size() > SPEED_ELEMENTS) + dc->hatch_pointer_past.pop_back(); + + // If the stacks are full, + if (dc->hatch_nearest_past.size() == SPEED_ELEMENTS) { + // calculate the sums of all stored movements + double nearest_sum = std::accumulate (dc->hatch_nearest_past.begin(), dc->hatch_nearest_past.end(), 0.0); + double pointer_sum = std::accumulate (dc->hatch_pointer_past.begin(), dc->hatch_pointer_past.end(), 0.0); + // and divide to get the speed + speed = nearest_sum/pointer_sum; + //g_print ("nearest sum %g pointer_sum %g speed %g\n", nearest_sum, pointer_sum, speed); + } + } + + if ( dc->hatch_escaped // already escaped, do not reattach + || (speed < SPEED_MIN) // stuck; most likely reached end of traced stroke + || (dc->hatch_spacing > 0 && hatch_dist > 50 * dc->hatch_spacing) // went too far from the guide + ) { + // We are NOT attracted to the guide! + + //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); + //g_print ("------nm %g pm %g ratio %g\n", nearest_moved, pointer_moved, ratio); + //g_print ("------dist %g spacing %g\n", dist, dc->spacing); + //g_print ("acting up: %s dist %g \n", position_is_ok? (dc->hatch_escaped? "escaped" : "dist") : "livarot", dist/dc->hatch_spacing); + + // Remember hatch_escaped so we don't get + // attracted again until the end of this stroke + dc->hatch_escaped = true; + + } else { + + // Calculate angle cosine of this vector-to-guide and all past vectors + // summed, to detect if we accidentally flipped to the other side of the + // guide + double dot = NR::dot (pointer - nearest, dc->hatch_vector_accumulated); + dot /= NR::L2(pointer - nearest) * NR::L2(dc->hatch_vector_accumulated); + + if (dc->hatch_spacing != 0) { // spacing was already set + double target; + if (speed > SPEED_NORMAL) { + // all ok, strictly obey the spacing + target = dc->hatch_spacing; + } else { + // looks like we're starting to lose speed, + // so _gradually_ let go attraction to prevent jerks + target = (dc->hatch_spacing * speed + hatch_dist * (SPEED_NORMAL - speed))/SPEED_NORMAL; + } + if (!isnan(dot) && dot < -0.5) {// flip + target = -target; + //g_print ("FLIP\n"); + } + + // This is the track pointer that we will use instead of the real one + NR::Point new_pointer = nearest + target * hatch_unit_vector; + //g_print ("NEW %g %g\n", new_point[NR::X], new_point[NR::Y]); + + // some limited feedback: allow persistent pulling to slightly change + // the spacing + dc->hatch_spacing += (hatch_dist - dc->hatch_spacing)/3500; + + // return it to the desktop coords + motion_dt = new_pointer * motion_to_curve.inverse(); + + } else { + // this is the first motion event, set the dist + dc->hatch_spacing = hatch_dist; + } + + // remember last points + dc->hatch_last_pointer = pointer; + dc->hatch_last_nearest = nearest; + dc->hatch_vector_accumulated += (pointer - nearest); + } + + dc->_message_context->set(Inkscape::NORMAL_MESSAGE, dc->hatch_escaped? _("Tracking: connection to guide path lost!") : _("Tracking a guide path")); + + } else { + dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("Drawing a calligraphic stroke")); + } + + 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; } - if ( dc->cur != dc->last ) { - sp_dyna_draw_brush(dc); - g_assert( dc->npoints > 0 ); - fit_and_split(dc, FALSE); + // Draw the hatching circle if necessary + if (event->motion.state & GDK_CONTROL_MASK) { + if (dc->hatch_spacing == 0 && hatch_dist != 0) { + // Haven't set spacing yet: gray, center free, update radius live + NR::Point c = desktop->w2d(motion_w); + NR::Matrix const sm (NR::scale(hatch_dist, hatch_dist) * NR::translate(c)); + sp_canvas_item_affine_absolute(dc->hatch_area, sm); + sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0x7f7f7fff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT); + sp_canvas_item_show(dc->hatch_area); + } else if (dc->dragging && !dc->hatch_escaped) { + // Tracking: green, center snapped, fixed radius + NR::Point c = motion_dt; + NR::Matrix const sm (NR::scale(dc->hatch_spacing, dc->hatch_spacing) * NR::translate(c)); + sp_canvas_item_affine_absolute(dc->hatch_area, sm); + sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0x00FF00ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT); + sp_canvas_item_show(dc->hatch_area); + } else if (dc->dragging && dc->hatch_escaped) { + // Tracking escaped: red, center free, fixed radius + NR::Point c = desktop->w2d(motion_w); + NR::Matrix const sm (NR::scale(dc->hatch_spacing, dc->hatch_spacing) * NR::translate(c)); + + sp_canvas_item_affine_absolute(dc->hatch_area, sm); + sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0xFF0000ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT); + sp_canvas_item_show(dc->hatch_area); + } else { + // Not drawing but spacing set: gray, center snapped, fixed radius + NR::Point c = (nearest + dc->hatch_spacing * hatch_unit_vector) * motion_to_curve.inverse(); + if (!isNaN(c[NR::X]) && !isNaN(c[NR::Y])) { + NR::Matrix const sm (NR::scale(dc->hatch_spacing, dc->hatch_spacing) * NR::translate(c)); + sp_canvas_item_affine_absolute(dc->hatch_area, sm); + sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0x7f7f7fff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT); + sp_canvas_item_show(dc->hatch_area); + } + } + } else { + sp_canvas_item_hide(dc->hatch_area); } - 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 ) { + if ( dc->is_dilating && event->button.button == 1 ) { + dc->is_dilating = false; + sp_document_done(sp_desktop_document(SP_EVENT_CONTEXT(dc)->desktop), + SP_VERB_CONTEXT_CALLIGRAPHIC, + (event->button.state & GDK_SHIFT_MASK ? _("Thicken paths") : _("Thin paths"))); + ret = TRUE; + } else if ( dc->dragging && event->button.button == 1 ) { dc->dragging = FALSE; NR::Point const motion_w(event->button.x, event->button.y); @@ -593,19 +1073,34 @@ sp_dyna_draw_context_root_handler(SPEventContext *event_context, 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 */ + set_to_accumulated(dc, event->button.state & GDK_SHIFT_MASK); // performs document_done + /* reset accumulated curve */ sp_curve_reset(dc->accumulated); + clear_current(dc); if (dc->repr) { dc->repr = NULL; } + + if (!dc->hatch_pointer_past.empty()) dc->hatch_pointer_past.clear(); + if (!dc->hatch_nearest_past.empty()) dc->hatch_nearest_past.clear(); + dc->hatch_last_nearest = NR::Point(0,0); + dc->hatch_last_pointer = NR::Point(0,0); + dc->hatch_vector_accumulated = NR::Point(0,0); + dc->hatch_escaped = false; + dc->hatch_item = NULL; + dc->hatch_livarot_path = NULL; + + dc->_message_context->clear(); ret = TRUE; } break; + case GDK_KEY_PRESS: switch (get_group0_keyval (&event->key)) { case GDK_Up: @@ -635,6 +1130,7 @@ sp_dyna_draw_context_root_handler(SPEventContext *event_context, 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 + sp_ddc_update_cursors(dc); ret = TRUE; } break; @@ -645,9 +1141,24 @@ sp_dyna_draw_context_root_handler(SPEventContext *event_context, if (dc->width < 0.01) dc->width = 0.01; sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100); + sp_ddc_update_cursors(dc); ret = TRUE; } break; + case GDK_Home: + case GDK_KP_Home: + dc->width = 0.01; + sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100); + sp_ddc_update_cursors(dc); + ret = TRUE; + break; + case GDK_End: + case GDK_KP_End: + dc->width = 1.0; + sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100); + sp_ddc_update_cursors(dc); + ret = TRUE; + break; case GDK_x: case GDK_X: if (MOD__ALT_ONLY) { @@ -670,9 +1181,61 @@ sp_dyna_draw_context_root_handler(SPEventContext *event_context, ret = TRUE; } break; + case GDK_Meta_L: + case GDK_Meta_R: + event_context->cursor_shape = cursor_thicken_xpm; + sp_event_context_update_cursor(event_context); + break; + case GDK_Alt_L: + case GDK_Alt_R: + if (MOD__SHIFT) { + event_context->cursor_shape = cursor_thicken_xpm; + sp_event_context_update_cursor(event_context); + } else { + event_context->cursor_shape = cursor_thin_xpm; + sp_event_context_update_cursor(event_context); + } + break; + case GDK_Shift_L: + case GDK_Shift_R: + if (MOD__ALT) { + event_context->cursor_shape = cursor_thicken_xpm; + sp_event_context_update_cursor(event_context); + } + break; default: break; } + break; + + case GDK_KEY_RELEASE: + switch (get_group0_keyval(&event->key)) { + case GDK_Control_L: + case GDK_Control_R: + dc->_message_context->clear(); + dc->hatch_spacing = 0; + break; + case GDK_Alt_L: + case GDK_Alt_R: + event_context->cursor_shape = cursor_calligraphy_xpm; + sp_event_context_update_cursor(event_context); + break; + case GDK_Shift_L: + case GDK_Shift_R: + if (MOD__ALT) { + event_context->cursor_shape = cursor_thin_xpm; + sp_event_context_update_cursor(event_context); + } + break; + case GDK_Meta_L: + case GDK_Meta_R: + event_context->cursor_shape = cursor_calligraphy_xpm; + sp_event_context_update_cursor(event_context); + break; + default: + break; + } + default: break; } @@ -701,7 +1264,7 @@ clear_current(SPDynaDrawContext *dc) } static void -set_to_accumulated(SPDynaDrawContext *dc) +set_to_accumulated(SPDynaDrawContext *dc, bool unionize) { SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop; @@ -723,11 +1286,6 @@ set_to_accumulated(SPDynaDrawContext *dc) 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); @@ -735,6 +1293,18 @@ set_to_accumulated(SPDynaDrawContext *dc) g_free(abp); dc->repr->setAttribute("d", str); g_free(str); + + if (unionize) { + sp_desktop_selection(desktop)->add(dc->repr); + sp_selected_path_union_skip_undo(); + } else { + if (dc->keep_selected) { + sp_desktop_selection(desktop)->set(dc->repr); + } else { + sp_desktop_selection(desktop)->clear(); + } + } + } else { if (dc->repr) { sp_repr_unparent(dc->repr); @@ -743,7 +1313,7 @@ set_to_accumulated(SPDynaDrawContext *dc) } sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_CALLIGRAPHIC, - _("Create calligraphic stroke")); + _("Draw calligraphic stroke")); } static void diff --git a/src/dyna-draw-context.h b/src/dyna-draw-context.h index 72940ac44..71fc40f8c 100644 --- a/src/dyna-draw-context.h +++ b/src/dyna-draw-context.h @@ -106,6 +106,21 @@ struct SPDynaDrawContext /** newly created object remain selected */ bool keep_selected; + + double hatch_spacing; + SPItem *hatch_item; + Path *hatch_livarot_path; + std::list hatch_nearest_past; + std::list hatch_pointer_past; + NR::Point hatch_last_nearest, hatch_last_pointer; + NR::Point hatch_vector_accumulated; + bool hatch_escaped; + SPCanvasItem *hatch_area; + + bool trace_bg; + + bool is_dilating; + SPCanvasItem *dilate_area; }; struct SPDynaDrawContextClass -- 2.30.2