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Diffstat (limited to '')
| -rw-r--r-- | src/object/sp-shape.cpp | 1330 |
1 files changed, 1330 insertions, 0 deletions
diff --git a/src/object/sp-shape.cpp b/src/object/sp-shape.cpp new file mode 100644 index 0000000..802f167 --- /dev/null +++ b/src/object/sp-shape.cpp @@ -0,0 +1,1330 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Base class for shapes, including <path> element + * + * Author: + * Lauris Kaplinski <lauris@kaplinski.com> + * Abhishek Sharma + * + * Copyright (C) 1999-2002 Lauris Kaplinski + * Copyright (C) 2000-2001 Ximian, Inc. + * Copyright (C) 2004 John Cliff + * Copyright (C) 2007-2008 Johan Engelen + * Copyright (C) 2010 Jon A. Cruz <jon@joncruz.org> + * + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#include <2geom/rect.h> +#include <2geom/transforms.h> +#include <2geom/pathvector.h> +#include <2geom/path-intersection.h> +#include "helper/geom.h" +#include "helper/geom-nodetype.h" + +#include <sigc++/functors/ptr_fun.h> +#include <sigc++/adaptors/bind.h> + +#include "display/drawing-shape.h" +#include "display/curve.h" +#include "print.h" +#include "document.h" +#include "style.h" +#include "sp-marker.h" +#include "sp-root.h" +#include "sp-path.h" +#include "preferences.h" +#include "attributes.h" +#include "path/path-outline.h" // For bound box calculation + +#include "svg/svg.h" +#include "svg/path-string.h" +#include "snap-candidate.h" +#include "snap-preferences.h" +#include "live_effects/lpeobject.h" + +#include "helper/mathfns.h" // for triangle_area() + +#define noSHAPE_VERBOSE + +static void sp_shape_update_marker_view (SPShape *shape, Inkscape::DrawingItem *ai); + +SPShape::SPShape() : SPLPEItem() { + for (auto & i : this->_marker) { + i = nullptr; + } + + this->_curve = nullptr; + this->_curve_before_lpe = nullptr; +} + +SPShape::~SPShape() { + for ( int i = 0 ; i < SP_MARKER_LOC_QTY ; i++ ) { + this->_release_connect[i].disconnect(); + this->_modified_connect[i].disconnect(); + } +} + +void SPShape::build(SPDocument *document, Inkscape::XML::Node *repr) { + SPLPEItem::build(document, repr); + + for (int i = 0 ; i < SP_MARKER_LOC_QTY ; i++) { + sp_shape_set_marker (this, i, this->style->marker_ptrs[i]->value()); + } +} + + +/** + * Removes, releases and unrefs all children of object + * + * This is the inverse of sp_shape_build(). It must be invoked as soon + * as the shape is removed from the tree, even if it is still referenced + * by other objects. This routine also disconnects/unrefs markers and + * curves attached to it. + * + * \see SPObject::release() + */ +void SPShape::release() { + for (int i = 0; i < SP_MARKER_LOC_QTY; i++) { + if (this->_marker[i]) { + + for (SPItemView *v = this->display; v != nullptr; v = v->next) { + sp_marker_hide(_marker[i], v->arenaitem->key() + i); + } + + this->_release_connect[i].disconnect(); + this->_modified_connect[i].disconnect(); + _marker[i]->unhrefObject(this); + _marker[i] = nullptr; + } + } + + _curve.reset(); + + _curve_before_lpe.reset(); + + SPLPEItem::release(); +} + +void SPShape::set(SPAttr key, const gchar* value) { + SPLPEItem::set(key, value); +} + + +Inkscape::XML::Node* SPShape::write(Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags) { + SPLPEItem::write(xml_doc, repr, flags); + return repr; +} + +void SPShape::update(SPCtx* ctx, guint flags) { + // Any update can change the bounding box, + // so the cached version can no longer be used. + // But the idle checker usually is just moving the objects around. + bbox_vis_cache_is_valid = false; + bbox_geom_cache_is_valid = false; + + // std::cout << "SPShape::update(): " << (getId()?getId():"null") << std::endl; + SPLPEItem::update(ctx, flags); + + /* This stanza checks that an object's marker style agrees with + * the marker objects it has allocated. sp_shape_set_marker ensures + * that the appropriate marker objects are present (or absent) to + * match the style. + */ + for (int i = 0 ; i < SP_MARKER_LOC_QTY ; i++) { + sp_shape_set_marker (this, i, this->style->marker_ptrs[i]->value()); + } + + if (flags & (SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) { + if (this->style->stroke_width.unit == SP_CSS_UNIT_PERCENT) { + SPItemCtx *ictx = (SPItemCtx *) ctx; + double const aw = 1.0 / ictx->i2vp.descrim(); + this->style->stroke_width.computed = this->style->stroke_width.value * aw; + + for (SPItemView *v = ((SPItem *) (this))->display; v != nullptr; v = v->next) { + Inkscape::DrawingShape *sh = dynamic_cast<Inkscape::DrawingShape *>(v->arenaitem); + if (hasMarkers()) { + this->context_style = this->style; + sh->setStyle(this->style, this->context_style); + // Done at end: + // sh->setChildrenStyle(this->context_style); //Resolve 'context-xxx' in children. + } else if (this->parent) { + this->context_style = this->parent->context_style; + sh->setStyle(this->style, this->context_style); + } + } + } + } + + if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_PARENT_MODIFIED_FLAG)) { + /* This is suboptimal, because changing parent style schedules recalculation */ + /* But on the other hand - how can we know that parent does not tie style and transform */ + for (SPItemView *v = this->display; v != nullptr; v = v->next) { + Inkscape::DrawingShape *sh = dynamic_cast<Inkscape::DrawingShape *>(v->arenaitem); + + if (flags & SP_OBJECT_MODIFIED_FLAG) { + sh->setPath(this->_curve.get()); + } + } + } + + if (this->hasMarkers ()) { + + /* Dimension marker views */ + for (SPItemView *v = this->display; v != nullptr; v = v->next) { + if (!v->arenaitem->key()) { + v->arenaitem->setKey(SPItem::display_key_new (SP_MARKER_LOC_QTY)); + } + + for (int i = 0 ; i < SP_MARKER_LOC_QTY ; i++) { + if (_marker[i]) { + sp_marker_show_dimension(_marker[i], + v->arenaitem->key() + i, + numberOfMarkers(i)); + } + } + } + + /* Update marker views */ + for (SPItemView *v = this->display; v != nullptr; v = v->next) { + sp_shape_update_marker_view (this, v->arenaitem); + } + + // Marker selector needs this here or marker previews are not rendered. + for (SPItemView *v = this->display; v != nullptr; v = v->next) { + Inkscape::DrawingShape *sh = dynamic_cast<Inkscape::DrawingShape *>(v->arenaitem); + + sh->setChildrenStyle(this->context_style); // Resolve 'context-xxx' in children. + } + } + + /* Update stroke/dashes for relative units. */ + if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) { + + SPItemCtx const *ictx = reinterpret_cast<SPItemCtx const *>(ctx); + + double const w = ictx->viewport.width(); + double const h = ictx->viewport.height(); + double const d = sqrt(w*w + h*h) * M_SQRT1_2; // diagonal per SVG spec + double const em = style->font_size.computed; + double const ex = 0.5 * em; // fixme: get x height from pango or libnrtype. + + if (style->stroke_width.unit == SP_CSS_UNIT_EM) { + style->stroke_width.computed = style->stroke_width.value * em; + } + else if (style->stroke_width.unit == SP_CSS_UNIT_EX) { + style->stroke_width.computed = style->stroke_width.value * ex; + } + else if (style->stroke_width.unit == SP_CSS_UNIT_PERCENT) { + style->stroke_width.computed = style->stroke_width.value * d; + } + + if (style->stroke_dasharray.values.size() != 0) { + for (auto&& i: style->stroke_dasharray.values) { + if (i.unit == SP_CSS_UNIT_EM) i.computed = i.value * em; + else if (i.unit == SP_CSS_UNIT_EX) i.computed = i.value * ex; + else if (i.unit == SP_CSS_UNIT_PERCENT) i.computed = i.value * d; + } + } + + if (style->stroke_dashoffset.unit == SP_CSS_UNIT_EM) { + style->stroke_dashoffset.computed = style->stroke_dashoffset.value * em; + } + else if (style->stroke_dashoffset.unit == SP_CSS_UNIT_EX) { + style->stroke_dashoffset.computed = style->stroke_dashoffset.value * ex; + } + else if (style->stroke_dashoffset.unit == SP_CSS_UNIT_PERCENT) { + style->stroke_dashoffset.computed = style->stroke_dashoffset.value * d; + } + } +} + +/** + * Calculate the transform required to get a marker's path object in the + * right place for particular path segment on a shape. + * + * \see sp_shape_marker_update_marker_view. + * + * From SVG spec: + * The axes of the temporary new user coordinate system are aligned according to the orient attribute on the 'marker' + * element and the slope of the curve at the given vertex. (Note: if there is a discontinuity at a vertex, the slope + * is the average of the slopes of the two segments of the curve that join at the given vertex. If a slope cannot be + * determined, the slope is assumed to be zero.) + * + * Reference: http://www.w3.org/TR/SVG11/painting.html#MarkerElement, the `orient' attribute. + * Reference for behaviour of zero-length segments: + * http://www.w3.org/TR/SVG11/implnote.html#PathElementImplementationNotes + */ +Geom::Affine sp_shape_marker_get_transform(Geom::Curve const & c1, Geom::Curve const & c2) +{ + Geom::Point p = c1.pointAt(1); + Geom::Curve * c1_reverse = c1.reverse(); + Geom::Point tang1 = - c1_reverse->unitTangentAt(0); + delete c1_reverse; + Geom::Point tang2 = c2.unitTangentAt(0); + + double const angle1 = Geom::atan2(tang1); + double const angle2 = Geom::atan2(tang2); + + double ret_angle = .5 * (angle1 + angle2); + + if ( fabs( angle2 - angle1 ) > M_PI ) { + /* ret_angle is in the middle of the larger of the two sectors between angle1 and + * angle2, so flip it by 180degrees to force it to the middle of the smaller sector. + * + * (Imagine a circle with rays drawn at angle1 and angle2 from the centre of the + * circle. Those two rays divide the circle into two sectors.) + */ + ret_angle += M_PI; + } + + return Geom::Rotate(ret_angle) * Geom::Translate(p); +} + +Geom::Affine sp_shape_marker_get_transform_at_start(Geom::Curve const & c) +{ + Geom::Point p = c.pointAt(0); + Geom::Affine ret = Geom::Translate(p); + + if ( !c.isDegenerate() ) { + Geom::Point tang = c.unitTangentAt(0); + double const angle = Geom::atan2(tang); + ret = Geom::Rotate(angle) * Geom::Translate(p); + } else { + /* FIXME: the svg spec says to search for a better alternative than zero angle directionality: + * http://www.w3.org/TR/SVG11/implnote.html#PathElementImplementationNotes */ + } + + return ret; +} + +Geom::Affine sp_shape_marker_get_transform_at_end(Geom::Curve const & c) +{ + Geom::Point p = c.pointAt(1); + Geom::Affine ret = Geom::Translate(p); + + if ( !c.isDegenerate() ) { + Geom::Curve * c_reverse = c.reverse(); + Geom::Point tang = - c_reverse->unitTangentAt(0); + delete c_reverse; + double const angle = Geom::atan2(tang); + ret = Geom::Rotate(angle) * Geom::Translate(p); + } else { + /* FIXME: the svg spec says to search for a better alternative than zero angle directionality: + * http://www.w3.org/TR/SVG11/implnote.html#PathElementImplementationNotes */ + } + + return ret; +} + +/** + * Updates the instances (views) of a given marker in a shape. + * Marker views have to be scaled already. The transformation + * is retrieved and then shown by calling sp_marker_show_instance. + * + * @todo figure out what to do when both 'marker' and for instance 'marker-end' are set. + */ +static void +sp_shape_update_marker_view(SPShape *shape, Inkscape::DrawingItem *ai) +{ + // position arguments to sp_marker_show_instance, basically counts the amount of markers. + int counter[4] = {0}; + + if (!shape->curve()) + return; + + Geom::PathVector const &pathv = shape->curve()->get_pathvector(); + if (pathv.empty()) return; + + // the first vertex should get a start marker, the last an end marker, and all the others a mid marker + // see bug 456148 + + // START marker + { + Geom::Affine const m (sp_shape_marker_get_transform_at_start(pathv.begin()->front())); + for (int i = 0; i < 2; i++) { // SP_MARKER_LOC and SP_MARKER_LOC_START + if ( shape->_marker[i] ) { + Geom::Affine m_auto = m; + // Reverse start marker if necessary. + if (shape->_marker[i]->orient_mode == MARKER_ORIENT_AUTO_START_REVERSE) { + m_auto = Geom::Rotate::from_degrees( 180.0 ) * m; + } + sp_marker_show_instance(shape->_marker[i], ai, + ai->key() + i, counter[i], m_auto, + shape->style->stroke_width.computed); + counter[i]++; + } + } + } + + // MID marker + if (shape->_marker[SP_MARKER_LOC_MID] || shape->_marker[SP_MARKER_LOC]) { + for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) { + // START position + if ( path_it != pathv.begin() + && ! ((path_it == (pathv.end()-1)) && (path_it->size_default() == 0)) ) // if this is the last path and it is a moveto-only, don't draw mid marker there + { + Geom::Affine const m (sp_shape_marker_get_transform_at_start(path_it->front())); + for (int i = 0; i < 3; i += 2) { // SP_MARKER_LOC and SP_MARKER_LOC_MID + if ( shape->_marker[i] ) { + sp_marker_show_instance(shape->_marker[i], ai, + ai->key() + i, counter[i], m, + shape->style->stroke_width.computed); + counter[i]++; + } + } + } + // MID position + if ( path_it->size_default() > 1) { + Geom::Path::const_iterator curve_it1 = path_it->begin(); // incoming curve + Geom::Path::const_iterator curve_it2 = ++(path_it->begin()); // outgoing curve + while (curve_it2 != path_it->end_default()) + { + /* Put marker between curve_it1 and curve_it2. + * Loop to end_default (so including closing segment), because when a path is closed, + * there should be a midpoint marker between last segment and closing straight line segment + */ + Geom::Affine const m (sp_shape_marker_get_transform(*curve_it1, *curve_it2)); + for (int i = 0; i < 3; i += 2) { // SP_MARKER_LOC and SP_MARKER_LOC_MID + if (shape->_marker[i]) { + sp_marker_show_instance(shape->_marker[i], ai, + ai->key() + i, counter[i], m, + shape->style->stroke_width.computed); + counter[i]++; + } + } + + ++curve_it1; + ++curve_it2; + } + } + // END position + if ( path_it != (pathv.end()-1) && !path_it->empty()) { + Geom::Curve const &lastcurve = path_it->back_default(); + Geom::Affine const m = sp_shape_marker_get_transform_at_end(lastcurve); + for (int i = 0; i < 3; i += 2) { // SP_MARKER_LOC and SP_MARKER_LOC_MID + if (shape->_marker[i]) { + sp_marker_show_instance(shape->_marker[i], ai, + ai->key() + i, counter[i], m, + shape->style->stroke_width.computed); + counter[i]++; + } + } + } + } + } + + // END marker + if ( shape->_marker[SP_MARKER_LOC_END] || shape->_marker[SP_MARKER_LOC] ) { + /* Get reference to last curve in the path. + * For moveto-only path, this returns the "closing line segment". */ + Geom::Path const &path_last = pathv.back(); + unsigned int index = path_last.size_default(); + if (index > 0) { + index--; + } + Geom::Curve const &lastcurve = path_last[index]; + Geom::Affine const m = sp_shape_marker_get_transform_at_end(lastcurve); + + for (int i = 0; i < 4; i += 3) { // SP_MARKER_LOC and SP_MARKER_LOC_END + if (shape->_marker[i]) { + sp_marker_show_instance(shape->_marker[i], ai, + ai->key() + i, counter[i], m, + shape->style->stroke_width.computed); + counter[i]++; + } + } + } +} + +void SPShape::modified(unsigned int flags) { + // std::cout << "SPShape::modified(): " << (getId()?getId():"null") << std::endl; + SPLPEItem::modified(flags); + + if (flags & SP_OBJECT_STYLE_MODIFIED_FLAG) { + for (SPItemView *v = this->display; v != nullptr; v = v->next) { + Inkscape::DrawingShape *sh = dynamic_cast<Inkscape::DrawingShape *>(v->arenaitem); + if (hasMarkers()) { + this->context_style = this->style; + sh->setStyle(this->style, this->context_style); + // Note: marker selector preview does not trigger SP_OBJECT_STYLE_MODIFIED_FLAG so + // this is not called when marker previews are generated, however there is code in + // SPShape::update() that calls this routine so we don't worry about it here. + sh->setChildrenStyle(this->context_style); // Resolve 'context-xxx' in children. + } else if (this->parent) { + this->context_style = this->parent->context_style; + sh->setStyle(this->style, this->context_style); + } + } + } + + if (flags & SP_OBJECT_MODIFIED_FLAG && style->filter.set) { + if (auto filter = style->getFilter()) { + filter->update_filter_all_regions(); + } + } + + if (!_curve) { + sp_lpe_item_update_patheffect(this, true, false); + } +} + +bool SPShape::checkBrokenPathEffect() +{ + if (hasBrokenPathEffect()) { + g_warning("The shape has unknown LPE on it. Convert to path to make it editable preserving the appearance; " + "editing it will remove the bad LPE"); + + if (this->getRepr()->attribute("d")) { + // unconditionally read the curve from d, if any, to preserve appearance + Geom::PathVector pv = sp_svg_read_pathv(this->getAttribute("d")); + setCurveInsync(std::make_unique<SPCurve>(pv)); + setCurveBeforeLPE(curve()); + } + + return true; + } + return false; +} + +/* Reset the shape's curve to the "original_curve" + * This is very important for LPEs to work properly! (the bbox might be recalculated depending on the curve in shape)*/ + +bool SPShape::prepareShapeForLPE(SPCurve const *c) +{ + auto const before = curveBeforeLPE(); + if (before && before->get_pathvector() != c->get_pathvector()) { + setCurveBeforeLPE(std::move(c)); + sp_lpe_item_update_patheffect(this, true, false); + return true; + } + + if (hasPathEffectOnClipOrMaskRecursive(this)) { + if (!before && this->getRepr()->attribute("d")) { + Geom::PathVector pv = sp_svg_read_pathv(getAttribute("d")); + setCurveInsync(std::make_unique<SPCurve>(pv)); + } + setCurveBeforeLPE(std::move(c)); + return true; + } + return false; +} + +Geom::OptRect SPShape::bbox(Geom::Affine const &transform, SPItem::BBoxType bboxtype) const { + // If the object is clipped, the update function that invalidates + // the cache doesn't get called if the object is moved, so we need + // to compare the transformations as well. + + if (bboxtype == SPItem::VISUAL_BBOX) { + bbox_vis_cache = + either_bbox(transform, bboxtype, bbox_vis_cache_is_valid, bbox_vis_cache, bbox_vis_cache_transform); + if (bbox_vis_cache) { + bbox_vis_cache_transform = transform; + bbox_vis_cache_is_valid = true; + } + return bbox_vis_cache; + } else { + bbox_geom_cache = + either_bbox(transform, bboxtype, bbox_geom_cache_is_valid, bbox_geom_cache, bbox_geom_cache_transform); + if (bbox_geom_cache) { + bbox_geom_cache_transform = transform; + bbox_geom_cache_is_valid = true; + } + return bbox_geom_cache; + } +} + +Geom::OptRect SPShape::either_bbox(Geom::Affine const &transform, SPItem::BBoxType bboxtype, bool cache_is_valid, + Geom::OptRect bbox_cache, Geom::Affine const &transform_cache) const +{ + + Geom::OptRect bbox; + + // Return the cache if possible. + auto delta = transform_cache.inverse() * transform; + if (cache_is_valid && bbox_cache && delta.isTranslation()) { + + // Don't re-adjust the cache if we haven't moved + if (!delta.isNonzeroTranslation()) { + return bbox_cache; + } + // delta is pure translation so it's safe to use it as is + return *bbox_cache * delta; + } + + if (!this->_curve || this->_curve->get_pathvector().empty()) { + return bbox; + } + + bbox = bounds_exact_transformed(this->_curve->get_pathvector(), transform); + + if (!bbox) { + return bbox; + } + + if (bboxtype == SPItem::VISUAL_BBOX) { + // convert the stroke to a path and calculate that path's geometric bbox + + if (!this->style->stroke.isNone() && !this->style->stroke_extensions.hairline) { + Geom::PathVector *pathv = item_to_outline(this, true); // calculate bbox_only + + if (pathv) { + bbox |= bounds_exact_transformed(*pathv, transform); + delete pathv; + } + } + + // Union with bboxes of the markers, if any + if ( this->hasMarkers() && !this->_curve->get_pathvector().empty() ) { + /** \todo make code prettier! */ + Geom::PathVector const & pathv = this->_curve->get_pathvector(); + // START marker + for (unsigned i = 0; i < 2; i++) { // SP_MARKER_LOC and SP_MARKER_LOC_START + if ( this->_marker[i] ) { + SPItem* marker_item = sp_item_first_item_child( _marker[i] ); + + if (marker_item) { + Geom::Affine tr(sp_shape_marker_get_transform_at_start(pathv.begin()->front())); + + if (_marker[i]->orient_mode == MARKER_ORIENT_AUTO_START_REVERSE) { + // Reverse start marker if necessary + tr = Geom::Rotate::from_degrees( 180.0 ) * tr; + } else if (_marker[i]->orient_mode == MARKER_ORIENT_ANGLE) { + Geom::Point transl = tr.translation(); + tr = Geom::Rotate::from_degrees(_marker[i]->orient.computed) * Geom::Translate(transl); + } + + if (_marker[i]->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) { + tr = Geom::Scale(this->style->stroke_width.computed) * tr; + } + + // total marker transform + tr = marker_item->transform * _marker[i]->c2p * tr * transform; + + // get bbox of the marker with that transform + bbox |= marker_item->visualBounds(tr); + } + } + } + + // MID marker + for (unsigned i = 0; i < 3; i += 2) { // SP_MARKER_LOC and SP_MARKER_LOC_MID + if ( !this->_marker[i] ) { + continue; + } + + SPMarker* marker = _marker[i]; + SPItem* marker_item = sp_item_first_item_child( marker ); + + if ( !marker_item ) { + continue; + } + + for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) { + // START position + if ( path_it != pathv.begin() + && ! ((path_it == (pathv.end()-1)) && (path_it->size_default() == 0)) ) // if this is the last path and it is a moveto-only, there is no mid marker there + { + Geom::Affine tr(sp_shape_marker_get_transform_at_start(path_it->front())); + + if (marker->orient_mode == MARKER_ORIENT_ANGLE) { + Geom::Point transl = tr.translation(); + tr = Geom::Rotate::from_degrees(marker->orient.computed) * Geom::Translate(transl); + } + + if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) { + tr = Geom::Scale(this->style->stroke_width.computed) * tr; + } + + tr = marker_item->transform * marker->c2p * tr * transform; + bbox |= marker_item->visualBounds(tr); + } + + // MID position + if ( path_it->size_default() > 1) { + Geom::Path::const_iterator curve_it1 = path_it->begin(); // incoming curve + Geom::Path::const_iterator curve_it2 = ++(path_it->begin()); // outgoing curve + + while (curve_it2 != path_it->end_default()) + { + /* Put marker between curve_it1 and curve_it2. + * Loop to end_default (so including closing segment), because when a path is closed, + * there should be a midpoint marker between last segment and closing straight line segment */ + + SPMarker* marker = _marker[i]; + SPItem* marker_item = sp_item_first_item_child( marker ); + + if (marker_item) { + Geom::Affine tr(sp_shape_marker_get_transform(*curve_it1, *curve_it2)); + + if (marker->orient_mode == MARKER_ORIENT_ANGLE) { + Geom::Point transl = tr.translation(); + tr = Geom::Rotate::from_degrees(marker->orient.computed) * Geom::Translate(transl); + } + + if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) { + tr = Geom::Scale(this->style->stroke_width.computed) * tr; + } + + tr = marker_item->transform * marker->c2p * tr * transform; + bbox |= marker_item->visualBounds(tr); + } + + ++curve_it1; + ++curve_it2; + } + } + + // END position + if ( path_it != (pathv.end()-1) && !path_it->empty()) { + Geom::Curve const &lastcurve = path_it->back_default(); + Geom::Affine tr = sp_shape_marker_get_transform_at_end(lastcurve); + + if (marker->orient_mode == MARKER_ORIENT_ANGLE) { + Geom::Point transl = tr.translation(); + tr = Geom::Rotate::from_degrees(marker->orient.computed) * Geom::Translate(transl); + } + + if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) { + tr = Geom::Scale(this->style->stroke_width.computed) * tr; + } + + tr = marker_item->transform * marker->c2p * tr * transform; + bbox |= marker_item->visualBounds(tr); + } + } + } + + // END marker + for (unsigned i = 0; i < 4; i += 3) { // SP_MARKER_LOC and SP_MARKER_LOC_END + if ( _marker[i] ) { + SPMarker* marker = _marker[i]; + SPItem* marker_item = sp_item_first_item_child( marker ); + + if (marker_item) { + /* Get reference to last curve in the path. + * For moveto-only path, this returns the "closing line segment". */ + Geom::Path const &path_last = pathv.back(); + unsigned int index = path_last.size_default(); + + if (index > 0) { + index--; + } + + Geom::Curve const &lastcurve = path_last[index]; + + Geom::Affine tr = sp_shape_marker_get_transform_at_end(lastcurve); + + if (marker->orient_mode == MARKER_ORIENT_ANGLE) { + Geom::Point transl = tr.translation(); + tr = Geom::Rotate::from_degrees(marker->orient.computed) * Geom::Translate(transl); + } + + if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) { + tr = Geom::Scale(this->style->stroke_width.computed) * tr; + } + + // total marker transform + tr = marker_item->transform * marker->c2p * tr * transform; + + // get bbox of the marker with that transform + bbox |= marker_item->visualBounds(tr); + } + } + } + } + } + + + return bbox; +} + +static void +sp_shape_print_invoke_marker_printing(SPObject *obj, Geom::Affine tr, SPStyle const *style, SPPrintContext *ctx) +{ + SPMarker *marker = SP_MARKER(obj); + if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) { + tr = Geom::Scale(style->stroke_width.computed) * tr; + } + + SPItem* marker_item = sp_item_first_item_child( marker ); + if (marker_item) { + tr = marker_item->transform * marker->c2p * tr; + + Geom::Affine old_tr = marker_item->transform; + marker_item->transform = tr; + marker_item->invoke_print (ctx); + marker_item->transform = old_tr; + } +} + +void SPShape::print(SPPrintContext* ctx) { + if (!this->_curve) { + return; + } + + Geom::PathVector const & pathv = this->_curve->get_pathvector(); + + if (pathv.empty()) { + return; + } + + /* fixme: Think (Lauris) */ + Geom::OptRect pbox, dbox, bbox; + pbox = this->geometricBounds(); + bbox = this->desktopVisualBounds(); + dbox = Geom::Rect::from_xywh(Geom::Point(0,0), this->document->getDimensions()); + + Geom::Affine const i2dt(this->i2dt_affine()); + + SPStyle* style = this->style; + + if (!style->fill.isNone()) { + ctx->fill (pathv, i2dt, style, pbox, dbox, bbox); + } + + if (!style->stroke.isNone()) { + ctx->stroke (pathv, i2dt, style, pbox, dbox, bbox); + } + + /** \todo make code prettier */ + // START marker + for (int i = 0; i < 2; i++) { // SP_MARKER_LOC and SP_MARKER_LOC_START + if ( this->_marker[i] ) { + Geom::Affine tr(sp_shape_marker_get_transform_at_start(pathv.begin()->front())); + sp_shape_print_invoke_marker_printing(this->_marker[i], tr, style, ctx); + } + } + + // MID marker + for (int i = 0; i < 3; i += 2) { // SP_MARKER_LOC and SP_MARKER_LOC_MID + if (this->_marker[i]) { + for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) { + // START position + if ( path_it != pathv.begin() + && ! ((path_it == (pathv.end()-1)) && (path_it->size_default() == 0)) ) // if this is the last path and it is a moveto-only, there is no mid marker there + { + Geom::Affine tr(sp_shape_marker_get_transform_at_start(path_it->front())); + sp_shape_print_invoke_marker_printing(this->_marker[i], tr, style, ctx); + } + + // MID position + if ( path_it->size_default() > 1) { + Geom::Path::const_iterator curve_it1 = path_it->begin(); // incoming curve + Geom::Path::const_iterator curve_it2 = ++(path_it->begin()); // outgoing curve + + while (curve_it2 != path_it->end_default()) + { + /* Put marker between curve_it1 and curve_it2. + * Loop to end_default (so including closing segment), because when a path is closed, + * there should be a midpoint marker between last segment and closing straight line segment */ + Geom::Affine tr(sp_shape_marker_get_transform(*curve_it1, *curve_it2)); + + sp_shape_print_invoke_marker_printing(this->_marker[i], tr, style, ctx); + + ++curve_it1; + ++curve_it2; + } + } + + if ( path_it != (pathv.end()-1) && !path_it->empty()) { + Geom::Curve const &lastcurve = path_it->back_default(); + Geom::Affine tr = sp_shape_marker_get_transform_at_end(lastcurve); + sp_shape_print_invoke_marker_printing(this->_marker[i], tr, style, ctx); + } + } + } + } + + // END marker + if ( this->_marker[SP_MARKER_LOC_END] || this->_marker[SP_MARKER_LOC]) { + /* Get reference to last curve in the path. + * For moveto-only path, this returns the "closing line segment". */ + Geom::Path const &path_last = pathv.back(); + unsigned int index = path_last.size_default(); + + if (index > 0) { + index--; + } + + Geom::Curve const &lastcurve = path_last[index]; + + Geom::Affine tr = sp_shape_marker_get_transform_at_end(lastcurve); + + for (int i = 0; i < 4; i += 3) { // SP_MARKER_LOC and SP_MARKER_LOC_END + if (this->_marker[i]) { + sp_shape_print_invoke_marker_printing(this->_marker[i], tr, style, ctx); + } + } + } +} + +void SPShape::update_patheffect(bool write) +{ + auto c_lpe = SPCurve::copy(curveForEdit()); + if (!c_lpe) { + set_shape(); + c_lpe = SPCurve::copy(curveForEdit()); + } + if (c_lpe) { + /* if a path has an lpeitem applied, then reset the curve to the _curve_before_lpe. + * This is very important for LPEs to work properly! (the bbox might be recalculated depending on the curve in shape)*/ + this->setCurveInsync(c_lpe.get()); + SPRoot *root = this->document->getRoot(); + if (!sp_version_inside_range(root->version.inkscape, 0, 1, 0, 92)) { + this->resetClipPathAndMaskLPE(); + } + + bool success = false; + if (hasPathEffect() && pathEffectsEnabled()) { + success = this->performPathEffect(c_lpe.get(), this); + if (success) { + this->setCurveInsync(c_lpe.get()); + this->applyToClipPath(this); + this->applyToMask(this); + } + } + if (write && success) { + Inkscape::XML::Node *repr = this->getRepr(); + if (repr) { + if (c_lpe != nullptr) { + repr->setAttribute("d", sp_svg_write_path(c_lpe->get_pathvector())); + } else { + repr->removeAttribute("d"); + } + } + } + this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG); + } +} + +Inkscape::DrawingItem* SPShape::show(Inkscape::Drawing &drawing, unsigned int /*key*/, unsigned int /*flags*/) { + // std::cout << "SPShape::show(): " << (getId()?getId():"null") << std::endl; + Inkscape::DrawingShape *s = new Inkscape::DrawingShape(drawing); + + bool has_markers = this->hasMarkers(); + + s->setPath(this->_curve.get()); + + /* This stanza checks that an object's marker style agrees with + * the marker objects it has allocated. sp_shape_set_marker ensures + * that the appropriate marker objects are present (or absent) to + * match the style. + */ + for (int i = 0 ; i < SP_MARKER_LOC_QTY ; i++) { + sp_shape_set_marker (this, i, this->style->marker_ptrs[i]->value()); + } + + if (has_markers) { + /* provide key and dimension the marker views */ + if (!s->key()) { + s->setKey(SPItem::display_key_new (SP_MARKER_LOC_QTY)); + } + + for (int i = 0; i < SP_MARKER_LOC_QTY; i++) { + if (_marker[i]) { + sp_marker_show_dimension(_marker[i], + s->key() + i, + numberOfMarkers(i)); + } + } + + /* Update marker views */ + sp_shape_update_marker_view (this, s); + + this->context_style = this->style; + s->setStyle(this->style, this->context_style); + s->setChildrenStyle(this->context_style); // Resolve 'context-xxx' in children. + } else if (this->parent) { + this->context_style = this->parent->context_style; + s->setStyle(this->style, this->context_style); + } + return s; +} + +/** + * Sets style, path, and paintbox. Updates marker views, including dimensions. + */ +void SPShape::hide(unsigned int key) { + for (int i = 0; i < SP_MARKER_LOC_QTY; ++i) { + if (_marker[i]) { + for (SPItemView* v = display; v != nullptr; v = v->next) { + if (key == v->key) { + sp_marker_hide(_marker[i], v->arenaitem->key() + i); + } + } + } + } + + //SPLPEItem::onHide(key); +} + +/** +* \param shape Shape. +* \return TRUE if the shape has any markers, or FALSE if not. +*/ +int SPShape::hasMarkers() const +{ + /* Note, we're ignoring 'marker' settings, which technically should apply for + all three settings. This should be fixed later such that if 'marker' is + specified, then all three should appear. */ + + // Ignore markers for objects which are inside markers themselves. + for (SPObject *parent = this->parent; parent != nullptr; parent = parent->parent) { + if (dynamic_cast<SPMarker *>(parent)) { + return 0; + } + } + + return ( + this->_curve && + (this->_marker[SP_MARKER_LOC] || + this->_marker[SP_MARKER_LOC_START] || + this->_marker[SP_MARKER_LOC_MID] || + this->_marker[SP_MARKER_LOC_END]) + ); +} + + +/** +* \param shape Shape. +* \param type Marker type (e.g. SP_MARKER_LOC_START) +* \return Number of markers that the shape has of this type. +*/ +int SPShape::numberOfMarkers(int type) const { + Geom::PathVector const & pathv = this->_curve->get_pathvector(); + + if (pathv.size() == 0) { + return 0; + } + switch(type) { + + case SP_MARKER_LOC: + { + if ( this->_marker[SP_MARKER_LOC] ) { + guint n = 0; + for(const auto & path_it : pathv) { + n += path_it.size_default() + 1; + } + return n; + } else { + return 0; + } + } + case SP_MARKER_LOC_START: + // there is only a start marker on the first path of a pathvector + return this->_marker[SP_MARKER_LOC_START] ? 1 : 0; + + case SP_MARKER_LOC_MID: + { + if ( this->_marker[SP_MARKER_LOC_MID] ) { + guint n = 0; + for(const auto & path_it : pathv) { + n += path_it.size_default() + 1; + } + n = (n > 1) ? (n - 2) : 0; // Minus the start and end marker, but never negative. + // A path or polyline may have only one point. + return n; + } else { + return 0; + } + } + + case SP_MARKER_LOC_END: + { + // there is only an end marker on the last path of a pathvector + return this->_marker[SP_MARKER_LOC_END] ? 1 : 0; + } + + default: + return 0; + } +} + +/** + * Checks if the given marker is used in the shape, and if so, it + * releases it by calling sp_marker_hide. Also detaches signals + * and unrefs the marker from the shape. + */ +static void +sp_shape_marker_release (SPObject *marker, SPShape *shape) +{ + SPItem *item = dynamic_cast<SPItem *>(shape); + g_return_if_fail(item != nullptr); + + for (int i = 0; i < SP_MARKER_LOC_QTY; i++) { + if (marker == shape->_marker[i]) { + SPItemView *v; + /* Hide marker */ + for (v = item->display; v != nullptr; v = v->next) { + sp_marker_hide(shape->_marker[i], v->arenaitem->key() + i); + } + /* Detach marker */ + shape->_release_connect[i].disconnect(); + shape->_modified_connect[i].disconnect(); + shape->_marker[i]->unhrefObject(item); + shape->_marker[i] = nullptr; + } + } +} + +/** + * No-op. Exists for handling 'modified' messages + */ +static void sp_shape_marker_modified (SPObject* marker, guint flags, SPItem* item) { + if ((flags & SP_OBJECT_MODIFIED_FLAG) && item && marker) { + // changing marker can impact object's visual bounding box, so request update on this object itself + item->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG); + } +} + +/** + * Adds a new marker to shape object at the location indicated by key. value + * must be a valid URI reference resolvable from the shape object (i.e., present + * in the document <defs>). If the shape object already has a marker + * registered at the given position, it is removed first. Then the + * new marker is hrefed and its signals connected. + */ +void +sp_shape_set_marker (SPObject *object, unsigned int key, const gchar *value) +{ + SPShape *shape = dynamic_cast<SPShape *>(object); + g_return_if_fail(shape != nullptr); + + if (key > SP_MARKER_LOC_END) { + return; + } + + SPObject *mrk = sp_css_uri_reference_resolve(object->document, value); + SPMarker *marker = dynamic_cast<SPMarker *>(mrk); + if (marker != shape->_marker[key]) { + if (shape->_marker[key]) { + SPItemView *v; + + /* Detach marker */ + shape->_release_connect[key].disconnect(); + shape->_modified_connect[key].disconnect(); + + /* Hide marker */ + for (v = shape->display; v != nullptr; v = v->next) { + sp_marker_hide(shape->_marker[key], + v->arenaitem->key() + key); + } + + /* Unref marker */ + shape->_marker[key]->unhrefObject(object); + shape->_marker[key] = nullptr; + } + if (marker) { + shape->_marker[key] = marker; + shape->_marker[key]->hrefObject(object); + shape->_release_connect[key] = marker->connectRelease(sigc::bind<1>(sigc::ptr_fun(&sp_shape_marker_release), shape)); + shape->_modified_connect[key] = marker->connectModified(sigc::bind<2>(sigc::ptr_fun(&sp_shape_marker_modified), shape)); + } + } +} + +// CPPIFY: make pure virtual +void SPShape::set_shape() { + //throw; +} + +/* Shape section */ + +void SPShape::_setCurve(std::unique_ptr<SPCurve> &&new_curve, bool update_display) +{ + _curve = std::move(new_curve); + + if (update_display && document) { + requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG); + } +} +void SPShape::_setCurve(SPCurve const *new_curve, bool update_display) +{ + _setCurve(SPCurve::copy(new_curve), update_display); +} + +/** + * Adds a curve to the shape. + * Any existing curve in the shape will be unreferenced first. + * This routine also triggers a request to update the display. + */ +void SPShape::setCurve(std::unique_ptr<SPCurve> &&new_curve) +{ + _setCurve(std::move(new_curve), true); +} +void SPShape::setCurve(SPCurve const *new_curve) +{ + _setCurve(new_curve, true); +} + +/** + * Sets _curve_before_lpe to a copy of `new_curve` + */ +void SPShape::setCurveBeforeLPE(std::unique_ptr<SPCurve> &&new_curve) +{ + _curve_before_lpe = std::move(new_curve); +} +void SPShape::setCurveBeforeLPE(SPCurve const *new_curve) +{ + setCurveBeforeLPE(SPCurve::copy(new_curve)); +} + +/** + * Same as setCurve() but without updating the display + */ +void SPShape::setCurveInsync(std::unique_ptr<SPCurve> &&new_curve) +{ + _setCurve(std::move(new_curve), false); +} +void SPShape::setCurveInsync(SPCurve const *new_curve) +{ + _setCurve(new_curve, false); +} + +/** + * Return a borrowed pointer to the curve (if any exists) or NULL if there is no curve + */ +SPCurve *SPShape::curve() +{ + return _curve.get(); +} +SPCurve const *SPShape::curve() const +{ + return _curve.get(); +} + +/** + * Return a borrowed pointer of the curve *before* LPE (if any exists) or NULL if there is no curve + */ +SPCurve const *SPShape::curveBeforeLPE() const +{ + return _curve_before_lpe.get(); +} + +/** + * Return a borrowed pointer of the curve for edit + */ +SPCurve const *SPShape::curveForEdit() const +{ + if (_curve_before_lpe) { + return _curve_before_lpe.get(); + } + return curve(); +} + +void SPShape::snappoints(std::vector<Inkscape::SnapCandidatePoint> &p, Inkscape::SnapPreferences const *snapprefs) const { + if (this->_curve == nullptr) { + return; + } + + Geom::PathVector const &pathv = this->_curve->get_pathvector(); + + if (pathv.empty()) { + return; + } + + Geom::Affine const i2dt (this->i2dt_affine ()); + + if (snapprefs->isTargetSnappable(Inkscape::SNAPTARGET_OBJECT_MIDPOINT)) { + Geom::OptRect bbox = this->desktopVisualBounds(); + + if (bbox) { + p.emplace_back(bbox->midpoint(), Inkscape::SNAPSOURCE_OBJECT_MIDPOINT, Inkscape::SNAPTARGET_OBJECT_MIDPOINT); + } + } + + for(const auto & path_it : pathv) { + if (snapprefs->isTargetSnappable(Inkscape::SNAPTARGET_NODE_CUSP)) { + // Add the first point of the path + p.emplace_back(path_it.initialPoint() * i2dt, Inkscape::SNAPSOURCE_NODE_CUSP, Inkscape::SNAPTARGET_NODE_CUSP); + } + + Geom::Path::const_iterator curve_it1 = path_it.begin(); // incoming curve + Geom::Path::const_iterator curve_it2 = ++(path_it.begin()); // outgoing curve + + while (curve_it1 != path_it.end_default()) + { + // For each path: consider midpoints of line segments for snapping + if (snapprefs->isTargetSnappable(Inkscape::SNAPTARGET_LINE_MIDPOINT)) { + if (Geom::LineSegment const* line_segment = dynamic_cast<Geom::LineSegment const*>(&(*curve_it1))) { + p.emplace_back(Geom::middle_point(*line_segment) * i2dt, Inkscape::SNAPSOURCE_LINE_MIDPOINT, Inkscape::SNAPTARGET_LINE_MIDPOINT); + } + } + + if (curve_it2 == path_it.end_default()) { // Test will only pass for the last iteration of the while loop + if (snapprefs->isTargetSnappable(Inkscape::SNAPTARGET_NODE_CUSP) && !path_it.closed()) { + // Add the last point of the path, but only for open paths + // (for closed paths the first and last point will coincide) + p.emplace_back((*curve_it1).finalPoint() * i2dt, Inkscape::SNAPSOURCE_NODE_CUSP, Inkscape::SNAPTARGET_NODE_CUSP); + } + } else { + /* Test whether to add the node between curve_it1 and curve_it2. + * Loop to end_default (so only iterating through the stroked part); */ + + Geom::NodeType nodetype = Geom::get_nodetype(*curve_it1, *curve_it2); + + bool c1 = snapprefs->isTargetSnappable(Inkscape::SNAPTARGET_NODE_CUSP) && (nodetype == Geom::NODE_CUSP || nodetype == Geom::NODE_NONE); + bool c2 = snapprefs->isTargetSnappable(Inkscape::SNAPTARGET_NODE_SMOOTH) && (nodetype == Geom::NODE_SMOOTH || nodetype == Geom::NODE_SYMM); + + if (c1 || c2) { + Inkscape::SnapSourceType sst; + Inkscape::SnapTargetType stt; + + switch (nodetype) { + case Geom::NODE_CUSP: + sst = Inkscape::SNAPSOURCE_NODE_CUSP; + stt = Inkscape::SNAPTARGET_NODE_CUSP; + break; + case Geom::NODE_SMOOTH: + case Geom::NODE_SYMM: + sst = Inkscape::SNAPSOURCE_NODE_SMOOTH; + stt = Inkscape::SNAPTARGET_NODE_SMOOTH; + break; + default: + sst = Inkscape::SNAPSOURCE_UNDEFINED; + stt = Inkscape::SNAPTARGET_UNDEFINED; + break; + } + + p.emplace_back(curve_it1->finalPoint() * i2dt, sst, stt); + } + } + + ++curve_it1; + ++curve_it2; + } + + // Find the internal intersections of each path and consider these for snapping + // (using "Method 1" as described in Inkscape::ObjectSnapper::_collectNodes()) + if (snapprefs->isTargetSnappable(Inkscape::SNAPTARGET_PATH_INTERSECTION) || snapprefs->isSourceSnappable(Inkscape::SNAPSOURCE_PATH_INTERSECTION)) { + Geom::Crossings cs; + + try { + cs = self_crossings(path_it); // This can be slow! + + if (!cs.empty()) { // There might be multiple intersections... + for (const auto & c : cs) { + Geom::Point p_ix = path_it.pointAt(c.ta); + p.emplace_back(p_ix * i2dt, Inkscape::SNAPSOURCE_PATH_INTERSECTION, Inkscape::SNAPTARGET_PATH_INTERSECTION); + } + } + } catch (Geom::RangeError &e) { + // do nothing + // The exception could be Geom::InfiniteSolutions: then no snappoints should be added + } + + } + } +} + +/* + 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:fileencoding=utf-8:textwidth=99 : |