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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:24:48 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:24:48 +0000
commitcca66b9ec4e494c1d919bff0f71a820d8afab1fa (patch)
tree146f39ded1c938019e1ed42d30923c2ac9e86789 /src/object/sp-conn-end.cpp
parentInitial commit. (diff)
downloadinkscape-upstream.tar.xz
inkscape-upstream.zip
Adding upstream version 1.2.2.upstream/1.2.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--src/object/sp-conn-end.cpp311
1 files changed, 311 insertions, 0 deletions
diff --git a/src/object/sp-conn-end.cpp b/src/object/sp-conn-end.cpp
new file mode 100644
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--- /dev/null
+++ b/src/object/sp-conn-end.cpp
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * TODO: insert short description here
+ *//*
+ * Authors: see git history
+ *
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+#include "sp-conn-end.h"
+
+#include <cstring>
+#include <string>
+#include <limits>
+
+#include "bad-uri-exception.h"
+#include "display/curve.h"
+#include "xml/repr.h"
+#include "sp-path.h"
+#include "uri.h"
+#include "document.h"
+#include "sp-item-group.h"
+#include "2geom/path-intersection.h"
+
+
+static void change_endpts(SPCurve *const curve, double const endPos[2]);
+
+SPConnEnd::SPConnEnd(SPObject *const owner)
+ : ref(owner)
+ , sub_ref(owner)
+ , href(nullptr)
+ , sub_href(nullptr)
+ // Default to center connection endpoint
+ , _changed_connection()
+ , _delete_connection()
+ , _transformed_connection()
+ , _group_connection()
+{
+}
+
+static SPObject const *get_nearest_common_ancestor(SPObject const *const obj, SPItem const *const objs[2])
+{
+ SPObject const *anc_sofar = obj;
+ for (unsigned i = 0; i < 2; ++i) {
+ if ( objs[i] != nullptr ) {
+ anc_sofar = anc_sofar->nearestCommonAncestor(objs[i]);
+ }
+ }
+ return anc_sofar;
+}
+
+
+static bool try_get_intersect_point_with_item_recursive(Geom::PathVector& conn_pv, SPItem* item,
+ const Geom::Affine& item_transform, double& intersect_pos)
+{
+ double initial_pos = intersect_pos;
+ // if this is a group...
+ if (SP_IS_GROUP(item)) {
+ SPGroup* group = SP_GROUP(item);
+
+ // consider all first-order children
+ double child_pos = 0.0;
+ std::vector<SPItem*> g = sp_item_group_item_list(group);
+ for (auto child_item : g) {
+ try_get_intersect_point_with_item_recursive(conn_pv, child_item,
+ item_transform * child_item->transform, child_pos);
+ if (intersect_pos < child_pos)
+ intersect_pos = child_pos;
+ }
+ return intersect_pos != initial_pos;
+ }
+
+ // if this is not a shape, nothing to be done
+ auto shape = dynamic_cast<SPShape const *>(item);
+ if (!shape)
+ return false;
+
+ // make sure it has an associated curve
+ auto item_curve = SPCurve::copy(shape->curve());
+ if (!item_curve) return false;
+
+ // apply transformations (up to common ancestor)
+ item_curve->transform(item_transform);
+
+ const Geom::PathVector& curve_pv = item_curve->get_pathvector();
+ Geom::CrossingSet cross = crossings(conn_pv, curve_pv);
+ // iterate over all Crossings
+ //TODO: check correctness of the following code: inner loop uses loop variable
+ // with a name identical to the loop variable of the outer loop. Then rename.
+ for (const auto & cr : cross) {
+ for (const auto & cr_pt : cr) {
+ if ( intersect_pos < cr_pt.ta)
+ intersect_pos = cr_pt.ta;
+ }
+ }
+
+ return intersect_pos != initial_pos;
+}
+
+
+// This function returns the outermost intersection point between the path (a connector)
+// and the item given. If the item is a group, then the component items are considered.
+// The transforms given should be to a common ancestor of both the path and item.
+//
+static bool try_get_intersect_point_with_item(SPPath* conn, SPItem* item,
+ const Geom::Affine& item_transform, const Geom::Affine& conn_transform,
+ const bool at_start, double& intersect_pos)
+{
+ // Copy the curve and apply transformations up to common ancestor.
+ auto conn_curve = conn->curve()->copy();
+ conn_curve->transform(conn_transform);
+
+ Geom::PathVector conn_pv = conn_curve->get_pathvector();
+
+ // If this is not the starting point, use Geom::Path::reverse() to reverse the path
+ if (!at_start) {
+ // connectors are actually a single path, so consider the first element from a Geom::PathVector
+ conn_pv[0] = conn_pv[0].reversed();
+ }
+
+ // We start with the intersection point at the beginning of the path
+ intersect_pos = 0.0;
+
+ // Find the intersection.
+ bool result = try_get_intersect_point_with_item_recursive(conn_pv, item, item_transform, intersect_pos);
+
+ if (!result) {
+ // No intersection point has been found (why?)
+ // just default to connector end
+ intersect_pos = 0;
+ }
+ // If not at the starting point, recompute position with respect to original path
+ if (!at_start) {
+ intersect_pos = conn_pv[0].size() - intersect_pos;
+ }
+
+ return result;
+}
+
+
+static void sp_conn_get_route_and_redraw(SPPath *const path, const bool updatePathRepr = true)
+{
+ // Get the new route around obstacles.
+ bool rerouted = path->connEndPair.reroutePathFromLibavoid();
+ if (!rerouted) {
+ return;
+ }
+
+ SPItem *h2attItem[2] = {nullptr};
+ path->connEndPair.getAttachedItems(h2attItem);
+
+ SPObject const *const ancestor = get_nearest_common_ancestor(path, h2attItem);
+ Geom::Affine const path2anc(i2anc_affine(path, ancestor));
+
+ // Set sensible values in case there the connector ends are not
+ // attached to any shapes.
+ Geom::PathVector conn_pv = path->curve()->get_pathvector();
+ double endPos[2] = { 0.0, static_cast<double>(conn_pv[0].size()) };
+
+ for (unsigned h = 0; h < 2; ++h) {
+ // Assume center point for all
+ if (h2attItem[h]) {
+ Geom::Affine h2i2anc = i2anc_affine(h2attItem[h], ancestor);
+ try_get_intersect_point_with_item(path, h2attItem[h], h2i2anc, path2anc,
+ (h == 0), endPos[h]);
+ }
+ }
+ change_endpts(path->curve(), endPos);
+ if (updatePathRepr) {
+ path->updateRepr();
+ path->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+ }
+}
+
+
+static void sp_conn_end_shape_modified(SPObject */*moved_item*/, int /*flags*/, SPPath *const path)
+{
+ if (path->connEndPair.isAutoRoutingConn()) {
+ path->connEndPair.tellLibavoidNewEndpoints();
+ }
+}
+
+
+void sp_conn_reroute_path(SPPath *const path)
+{
+ if (path->connEndPair.isAutoRoutingConn()) {
+ path->connEndPair.tellLibavoidNewEndpoints();
+ }
+}
+
+
+void sp_conn_reroute_path_immediate(SPPath *const path)
+{
+ if (path->connEndPair.isAutoRoutingConn()) {
+ bool processTransaction = true;
+ path->connEndPair.tellLibavoidNewEndpoints(processTransaction);
+ }
+ // Don't update the path repr or else connector dragging is slowed by
+ // constant update of values to the xml editor, and each step is also
+ // needlessly remembered by undo/redo.
+ bool const updatePathRepr = false;
+ sp_conn_get_route_and_redraw(path, updatePathRepr);
+}
+
+void sp_conn_redraw_path(SPPath *const path)
+{
+ sp_conn_get_route_and_redraw(path);
+}
+
+
+static void change_endpts(SPCurve *const curve, double const endPos[2])
+{
+ // Use Geom::Path::portion to cut the curve at the end positions
+ if (endPos[0] > endPos[1]) {
+ // Path is "negative", reset the curve and return
+ curve->reset();
+ return;
+ }
+ const Geom::Path& old_path = curve->get_pathvector()[0];
+ Geom::PathVector new_path_vector;
+ new_path_vector.push_back(old_path.portion(endPos[0], endPos[1]));
+ curve->set_pathvector(new_path_vector);
+}
+
+static void sp_conn_end_deleted(SPObject *, SPObject *const owner, unsigned const handle_ix)
+{
+ char const * const attrs[] = {
+ "inkscape:connection-start", "inkscape:connection-end"};
+ owner->removeAttribute(attrs[handle_ix]);
+
+ char const * const point_attrs[] = {
+ "inkscape:connection-start-point", "inkscape:connection-end-point"};
+ owner->removeAttribute(point_attrs[handle_ix]);
+ /* I believe this will trigger sp_conn_end_href_changed. */
+}
+
+void sp_conn_end_detach(SPObject *const owner, unsigned const handle_ix)
+{
+ sp_conn_end_deleted(nullptr, owner, handle_ix);
+}
+
+void SPConnEnd::setAttacherHref(gchar const *value)
+{
+ if (g_strcmp0(value, href) != 0) {
+ g_free(href);
+ href = g_strdup(value);
+ if (!ref.try_attach(value)) {
+ g_free(href);
+ href = nullptr;
+ }
+ }
+}
+
+void SPConnEnd::setAttacherSubHref(gchar const *value)
+{
+ // TODO This could check the URI object is actually a sub-object
+ // of the set href. It should be done here and in setAttacherHref
+ if (g_strcmp0(value, sub_href) != 0) {
+ g_free(sub_href);
+ sub_href = g_strdup(value);
+ if (!sub_ref.try_attach(value)) {
+ g_free(sub_href);
+ sub_href = nullptr;
+ }
+ }
+}
+
+
+
+void sp_conn_end_href_changed(SPObject */*old_ref*/, SPObject */*ref*/,
+ SPConnEnd *connEndPtr, SPPath *const path, unsigned const handle_ix)
+{
+ g_return_if_fail(connEndPtr != nullptr);
+ SPConnEnd &connEnd = *connEndPtr;
+ connEnd._delete_connection.disconnect();
+ connEnd._transformed_connection.disconnect();
+ connEnd._group_connection.disconnect();
+
+ if (connEnd.href) {
+ SPObject *refobj = connEnd.ref.getObject();
+ if (refobj) {
+ connEnd._delete_connection
+ = refobj->connectDelete(sigc::bind(sigc::ptr_fun(&sp_conn_end_deleted),
+ path, handle_ix));
+ // This allows the connector tool to dive into a group's children
+ // And connect to their children's centers.
+ SPObject *parent = refobj->parent;
+ if (SP_IS_GROUP(parent) && ! SP_IS_LAYER(parent)) {
+ connEnd._group_connection
+ = SP_ITEM(parent)->connectModified(sigc::bind(sigc::ptr_fun(&sp_conn_end_shape_modified),
+ path));
+ }
+ connEnd._transformed_connection
+ = SP_ITEM(refobj)->connectModified(sigc::bind(sigc::ptr_fun(&sp_conn_end_shape_modified),
+ path));
+ }
+ }
+}
+
+
+
+/*
+ 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 :