#define __SP_DRAW_CONTEXT_C__ /* * Generic drawing context * * Author: * Lauris Kaplinski <lauris@kaplinski.com> * * Copyright (C) 2000 Lauris Kaplinski * Copyright (C) 2000-2001 Ximian, Inc. * Copyright (C) 2002 Lauris Kaplinski * * Released under GNU GPL, read the file 'COPYING' for more information */ #define DRAW_VERBOSE #ifdef HAVE_CONFIG_H # include "config.h" #endif #include <gdk/gdkkeysyms.h> #include "display/canvas-bpath.h" #include "xml/repr.h" #include "svg/svg.h" #include <glibmm/i18n.h> #include "libnr/n-art-bpath.h" #include "desktop.h" #include "desktop-affine.h" #include "desktop-handles.h" #include "desktop-style.h" #include "document.h" #include "draw-anchor.h" #include "macros.h" #include "message-stack.h" #include "pen-context.h" #include "prefs-utils.h" #include "selection.h" #include "selection-chemistry.h" #include "snap.h" #include "sp-path.h" #include "sp-namedview.h" static void sp_draw_context_class_init(SPDrawContextClass *klass); static void sp_draw_context_init(SPDrawContext *dc); static void sp_draw_context_dispose(GObject *object); static void sp_draw_context_setup(SPEventContext *ec); static void sp_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *value); static void sp_draw_context_finish(SPEventContext *ec); static gint sp_draw_context_root_handler(SPEventContext *event_context, GdkEvent *event); static void spdc_selection_changed(Inkscape::Selection *sel, SPDrawContext *dc); static void spdc_selection_modified(Inkscape::Selection *sel, guint flags, SPDrawContext *dc); static void spdc_attach_selection(SPDrawContext *dc, Inkscape::Selection *sel); static void spdc_flush_white(SPDrawContext *dc, SPCurve *gc); static void spdc_reset_white(SPDrawContext *dc); static void spdc_free_colors(SPDrawContext *dc); static SPEventContextClass *draw_parent_class; GType sp_draw_context_get_type(void) { static GType type = 0; if (!type) { GTypeInfo info = { sizeof(SPDrawContextClass), NULL, NULL, (GClassInitFunc) sp_draw_context_class_init, NULL, NULL, sizeof(SPDrawContext), 4, (GInstanceInitFunc) sp_draw_context_init, NULL, /* value_table */ }; type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDrawContext", &info, (GTypeFlags)0); } return type; } static void sp_draw_context_class_init(SPDrawContextClass *klass) { GObjectClass *object_class; SPEventContextClass *ec_class; object_class = (GObjectClass *)klass; ec_class = (SPEventContextClass *) klass; draw_parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass); object_class->dispose = sp_draw_context_dispose; ec_class->setup = sp_draw_context_setup; ec_class->set = sp_draw_context_set; ec_class->finish = sp_draw_context_finish; ec_class->root_handler = sp_draw_context_root_handler; } static void sp_draw_context_init(SPDrawContext *dc) { dc->attach = FALSE; dc->red_color = 0xff00007f; dc->blue_color = 0x0000ff7f; dc->green_color = 0x00ff007f; dc->red_curve_is_valid = false; new (&dc->sel_changed_connection) sigc::connection(); new (&dc->sel_modified_connection) sigc::connection(); } static void sp_draw_context_dispose(GObject *object) { SPDrawContext *dc = SP_DRAW_CONTEXT(object); dc->sel_changed_connection.~connection(); dc->sel_modified_connection.~connection(); if (dc->grab) { sp_canvas_item_ungrab(dc->grab, GDK_CURRENT_TIME); dc->grab = NULL; } if (dc->selection) { dc->selection = NULL; } spdc_free_colors(dc); G_OBJECT_CLASS(draw_parent_class)->dispose(object); } static void sp_draw_context_setup(SPEventContext *ec) { SPDrawContext *dc = SP_DRAW_CONTEXT(ec); SPDesktop *dt = ec->desktop; if (((SPEventContextClass *) draw_parent_class)->setup) { ((SPEventContextClass *) draw_parent_class)->setup(ec); } dc->selection = sp_desktop_selection(dt); /* Connect signals to track selection changes */ dc->sel_changed_connection = dc->selection->connectChanged( sigc::bind(sigc::ptr_fun(&spdc_selection_changed), dc) ); dc->sel_modified_connection = dc->selection->connectModified( sigc::bind(sigc::ptr_fun(&spdc_selection_modified), dc) ); /* Create red bpath */ dc->red_bpath = sp_canvas_bpath_new(sp_desktop_sketch(ec->desktop), NULL); sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->red_bpath), dc->red_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT); /* Create red curve */ dc->red_curve = sp_curve_new_sized(4); /* Create blue bpath */ dc->blue_bpath = sp_canvas_bpath_new(sp_desktop_sketch(ec->desktop), NULL); sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->blue_bpath), dc->blue_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT); /* Create blue curve */ dc->blue_curve = sp_curve_new_sized(8); /* Create green curve */ dc->green_curve = sp_curve_new_sized(64); /* No green anchor by default */ dc->green_anchor = NULL; dc->green_closed = FALSE; dc->attach = TRUE; spdc_attach_selection(dc, dc->selection); } static void sp_draw_context_finish(SPEventContext *ec) { SPDrawContext *dc = SP_DRAW_CONTEXT(ec); dc->sel_changed_connection.disconnect(); dc->sel_modified_connection.disconnect(); if (dc->grab) { sp_canvas_item_ungrab(dc->grab, GDK_CURRENT_TIME); } if (dc->selection) { dc->selection = NULL; } spdc_free_colors(dc); } static void sp_draw_context_set(SPEventContext */*ec*/, const gchar */*key*/, const gchar */*value*/) { } gint sp_draw_context_root_handler(SPEventContext *ec, GdkEvent *event) { gint ret = FALSE; switch (event->type) { case GDK_KEY_PRESS: switch (get_group0_keyval (&event->key)) { case GDK_Up: case GDK_Down: case GDK_KP_Up: case GDK_KP_Down: // prevent the zoom field from activation if (!MOD__CTRL_ONLY) { ret = TRUE; } break; default: break; } break; default: break; } if (!ret) { if (((SPEventContextClass *) draw_parent_class)->root_handler) { ret = ((SPEventContextClass *) draw_parent_class)->root_handler(ec, event); } } return ret; } /* * Selection handlers */ static void spdc_selection_changed(Inkscape::Selection *sel, SPDrawContext *dc) { if (dc->attach) { spdc_attach_selection(dc, sel); } } /* fixme: We have to ensure this is not delayed (Lauris) */ static void spdc_selection_modified(Inkscape::Selection *sel, guint /*flags*/, SPDrawContext *dc) { if (dc->attach) { spdc_attach_selection(dc, sel); } } static void spdc_attach_selection(SPDrawContext *dc, Inkscape::Selection */*sel*/) { /* We reset white and forget white/start/end anchors */ spdc_reset_white(dc); dc->sa = NULL; dc->ea = NULL; SPItem *item = dc->selection ? dc->selection->singleItem() : NULL; if ( item && SP_IS_PATH(item) ) { /* Create new white data */ /* Item */ dc->white_item = item; /* Curve list */ /* We keep it in desktop coordinates to eliminate calculation errors */ SPCurve *norm = sp_shape_get_curve(SP_SHAPE(item)); sp_curve_transform(norm, sp_item_i2d_affine(dc->white_item)); g_return_if_fail( norm != NULL ); dc->white_curves = g_slist_reverse(sp_curve_split(norm)); sp_curve_unref(norm); /* Anchor list */ for (GSList *l = dc->white_curves; l != NULL; l = l->next) { SPCurve *c; c = (SPCurve*)l->data; g_return_if_fail( c->end > 1 ); if ( SP_CURVE_BPATH(c)->code == NR_MOVETO_OPEN ) { NArtBpath *s, *e; SPDrawAnchor *a; s = sp_curve_first_bpath(c); e = sp_curve_last_bpath(c); a = sp_draw_anchor_new(dc, c, TRUE, NR::Point(s->x3, s->y3)); dc->white_anchors = g_slist_prepend(dc->white_anchors, a); a = sp_draw_anchor_new(dc, c, FALSE, NR::Point(e->x3, e->y3)); dc->white_anchors = g_slist_prepend(dc->white_anchors, a); } } /* fixme: recalculate active anchor? */ } } /** * Snaps node or handle to PI/rotationsnapsperpi degree increments. * * \param dc draw context * \param p cursor point (to be changed by snapping) * \param o origin point * \param state keyboard state to check if ctrl was pressed */ void spdc_endpoint_snap_rotation(SPEventContext const *const ec, NR::Point &p, NR::Point const o, guint state) { /* Control must be down for this snap to work */ if ((state & GDK_CONTROL_MASK) == 0) { return; } unsigned const snaps = abs(prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12)); /* 0 means no snapping. */ /* mirrored by fabs, so this corresponds to 15 degrees */ NR::Point best; /* best solution */ double bn = NR_HUGE; /* best normal */ double bdot = 0; NR::Point v = NR::Point(0, 1); double const r00 = cos(M_PI / snaps), r01 = sin(M_PI / snaps); double const r10 = -r01, r11 = r00; NR::Point delta = p - o; for (unsigned i = 0; i < snaps; i++) { double const ndot = fabs(dot(v,NR::rot90(delta))); NR::Point t(r00*v[NR::X] + r01*v[NR::Y], r10*v[NR::X] + r11*v[NR::Y]); if (ndot < bn) { /* I think it is better numerically to use the normal, rather than the dot product * to assess solutions, but I haven't proven it. */ bn = ndot; best = v; bdot = dot(v, delta); } v = t; } if (fabs(bdot) > 0) { p = o + bdot * best; /* Snap it along best vector */ SnapManager const &m = SP_EVENT_CONTEXT_DESKTOP(ec)->namedview->snap_manager; p = m.constrainedSnap(Inkscape::Snapper::SNAPPOINT_NODE, p, Inkscape::Snapper::ConstraintLine(best), NULL).getPoint(); } } void spdc_endpoint_snap_free(SPEventContext const * const ec, NR::Point& p, guint const state) { /* Shift disables this snap */ if (state & GDK_SHIFT_MASK) { return; } SnapManager const &m = SP_EVENT_CONTEXT_DESKTOP(ec)->namedview->snap_manager; p = m.freeSnap(Inkscape::Snapper::SNAPPOINT_NODE, p, NULL).getPoint(); } static SPCurve * reverse_then_unref(SPCurve *orig) { SPCurve *ret = sp_curve_reverse(orig); sp_curve_unref(orig); return ret; } /** * Concats red, blue and green. * If any anchors are defined, process these, optionally removing curves from white list * Invoke _flush_white to write result back to object. */ void spdc_concat_colors_and_flush(SPDrawContext *dc, gboolean forceclosed) { /* Concat RBG */ SPCurve *c = dc->green_curve; /* Green */ dc->green_curve = sp_curve_new_sized(64); while (dc->green_bpaths) { gtk_object_destroy(GTK_OBJECT(dc->green_bpaths->data)); dc->green_bpaths = g_slist_remove(dc->green_bpaths, dc->green_bpaths->data); } /* Blue */ sp_curve_append_continuous(c, dc->blue_curve, 0.0625); sp_curve_reset(dc->blue_curve); sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->blue_bpath), NULL); /* Red */ if (dc->red_curve_is_valid) { sp_curve_append_continuous(c, dc->red_curve, 0.0625); } sp_curve_reset(dc->red_curve); sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->red_bpath), NULL); if (sp_curve_empty(c)) { sp_curve_unref(c); return; } /* Step A - test, whether we ended on green anchor */ if ( forceclosed || ( dc->green_anchor && dc->green_anchor->active ) ) { // We hit green anchor, closing Green-Blue-Red SP_EVENT_CONTEXT_DESKTOP(dc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Path is closed.")); sp_curve_closepath_current(c); /* Closed path, just flush */ spdc_flush_white(dc, c); sp_curve_unref(c); return; } /* Step B - both start and end anchored to same curve */ if ( dc->sa && dc->ea && ( dc->sa->curve == dc->ea->curve ) && ( ( dc->sa != dc->ea ) || dc->sa->curve->closed ) ) { // We hit bot start and end of single curve, closing paths SP_EVENT_CONTEXT_DESKTOP(dc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Closing path.")); if (dc->sa->start && !(dc->sa->curve->closed) ) { c = reverse_then_unref(c); } sp_curve_append_continuous(dc->sa->curve, c, 0.0625); sp_curve_unref(c); sp_curve_closepath_current(dc->sa->curve); spdc_flush_white(dc, NULL); return; } /* Step C - test start */ if (dc->sa) { SPCurve *s = dc->sa->curve; dc->white_curves = g_slist_remove(dc->white_curves, s); if (dc->sa->start) { s = reverse_then_unref(s); } sp_curve_append_continuous(s, c, 0.0625); sp_curve_unref(c); c = s; } else /* Step D - test end */ if (dc->ea) { SPCurve *e = dc->ea->curve; dc->white_curves = g_slist_remove(dc->white_curves, e); if (!dc->ea->start) { e = reverse_then_unref(e); } sp_curve_append_continuous(c, e, 0.0625); sp_curve_unref(e); } spdc_flush_white(dc, c); sp_curve_unref(c); } static char const * tool_name(SPDrawContext *dc) { return ( SP_IS_PEN_CONTEXT(dc) ? "tools.freehand.pen" : "tools.freehand.pencil" ); } /* * Flushes white curve(s) and additional curve into object * * No cleaning of colored curves - this has to be done by caller * No rereading of white data, so if you cannot rely on ::modified, do it in caller * */ static void spdc_flush_white(SPDrawContext *dc, SPCurve *gc) { SPCurve *c; if (dc->white_curves) { g_assert(dc->white_item); c = sp_curve_concat(dc->white_curves); g_slist_free(dc->white_curves); dc->white_curves = NULL; if (gc) { sp_curve_append(c, gc, FALSE); } } else if (gc) { c = gc; sp_curve_ref(c); } else { return; } /* Now we have to go back to item coordinates at last */ sp_curve_transform(c, ( dc->white_item ? sp_item_dt2i_affine(dc->white_item) : sp_desktop_dt2root_affine(SP_EVENT_CONTEXT_DESKTOP(dc)) )); SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc); SPDocument *doc = sp_desktop_document(desktop); Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc); if ( c && !sp_curve_empty(c) ) { /* We actually have something to write */ Inkscape::XML::Node *repr; if (dc->white_item) { repr = SP_OBJECT_REPR(dc->white_item); } else { repr = xml_doc->createElement("svg:path"); /* Set style */ sp_desktop_apply_style_tool(desktop, repr, tool_name(dc), false); } gchar *str = sp_svg_write_path(SP_CURVE_BPATH(c)); g_assert( str != NULL ); repr->setAttribute("d", str); g_free(str); if (!dc->white_item) { /* Attach repr */ SPItem *item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr)); dc->selection->set(repr); Inkscape::GC::release(repr); item->transform = i2i_affine(desktop->currentRoot(), desktop->currentLayer()); item->updateRepr(); } sp_document_done(doc, SP_IS_PEN_CONTEXT(dc)? SP_VERB_CONTEXT_PEN : SP_VERB_CONTEXT_PENCIL, _("Draw path")); } sp_curve_unref(c); /* Flush pending updates */ sp_document_ensure_up_to_date(doc); } /** * Returns FIRST active anchor (the activated one). */ SPDrawAnchor * spdc_test_inside(SPDrawContext *dc, NR::Point p) { SPDrawAnchor *active = NULL; /* Test green anchor */ if (dc->green_anchor) { active = sp_draw_anchor_test(dc->green_anchor, p, TRUE); } for (GSList *l = dc->white_anchors; l != NULL; l = l->next) { SPDrawAnchor *na = sp_draw_anchor_test((SPDrawAnchor *) l->data, p, !active); if ( !active && na ) { active = na; } } return active; } static void spdc_reset_white(SPDrawContext *dc) { if (dc->white_item) { /* We do not hold refcount */ dc->white_item = NULL; } while (dc->white_curves) { sp_curve_unref((SPCurve *) dc->white_curves->data); dc->white_curves = g_slist_remove(dc->white_curves, dc->white_curves->data); } while (dc->white_anchors) { sp_draw_anchor_destroy((SPDrawAnchor *) dc->white_anchors->data); dc->white_anchors = g_slist_remove(dc->white_anchors, dc->white_anchors->data); } } static void spdc_free_colors(SPDrawContext *dc) { /* Red */ if (dc->red_bpath) { gtk_object_destroy(GTK_OBJECT(dc->red_bpath)); dc->red_bpath = NULL; } if (dc->red_curve) { dc->red_curve = sp_curve_unref(dc->red_curve); } /* Blue */ if (dc->blue_bpath) { gtk_object_destroy(GTK_OBJECT(dc->blue_bpath)); dc->blue_bpath = NULL; } if (dc->blue_curve) { dc->blue_curve = sp_curve_unref(dc->blue_curve); } /* Green */ while (dc->green_bpaths) { gtk_object_destroy(GTK_OBJECT(dc->green_bpaths->data)); dc->green_bpaths = g_slist_remove(dc->green_bpaths, dc->green_bpaths->data); } if (dc->green_curve) { dc->green_curve = sp_curve_unref(dc->green_curve); } if (dc->green_anchor) { dc->green_anchor = sp_draw_anchor_destroy(dc->green_anchor); } /* White */ if (dc->white_item) { /* We do not hold refcount */ dc->white_item = NULL; } while (dc->white_curves) { sp_curve_unref((SPCurve *) dc->white_curves->data); dc->white_curves = g_slist_remove(dc->white_curves, dc->white_curves->data); } while (dc->white_anchors) { sp_draw_anchor_destroy((SPDrawAnchor *) dc->white_anchors->data); dc->white_anchors = g_slist_remove(dc->white_anchors, dc->white_anchors->data); } } /* 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 :