1 files changed, 199 insertions, 0 deletions
diff --git a/src/path/path-util.cpp b/src/path/path-util.cpp
new file mode 100644
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+++ b/src/path/path-util.cpp
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Path utilities.
+ *//*
+ * Authors:
+ * see git history
+ *  Created by fred on Fri Dec 05 2003.
+ *  tweaked endlessly by bulia byak <buliabyak@users.sf.net>
+ *
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifdef HAVE_CONFIG_H
+#endif
+
+#include <vector>
+
+#include "path-util.h"
+
+#include "text-editing.h"
+
+#include "livarot/Path.h"
+#include "livarot/Shape.h"
+
+#include "object/sp-flowtext.h"
+#include "object/sp-image.h"
+#include "object/sp-marker.h"
+#include "object/sp-path.h"
+#include "object/sp-text.h"
+
+#include "display/curve.h"
+
+// derived from Path_for_item
+Path *
+Path_for_pathvector(Geom::PathVector const &epathv)
+{
+    /*std::cout << "converting to Livarot path" << std::endl;
+
+    Geom::SVGPathWriter wr;
+    wr.feed(epathv);
+    std::cout << wr.str() << std::endl;*/
+
+    Path *dest = new Path;
+    dest->LoadPathVector(epathv);
+    return dest;
+}
+
+Path *
+Path_for_item(SPItem *item, bool doTransformation, bool transformFull)
+{
+    std::unique_ptr<SPCurve> curve = curve_for_item(item);
+
+    if (curve == nullptr)
+        return nullptr;
+
+    Geom::PathVector *pathv =
+        pathvector_for_curve(item, curve.get(), doTransformation, transformFull, Geom::identity(), Geom::identity());
+
+    /*std::cout << "converting to Livarot path" << std::endl;
+
+    Geom::SVGPathWriter wr;
+    if (pathv) {
+        wr.feed(*pathv);
+    }
+    std::cout << wr.str() << std::endl;*/
+
+    Path *dest = new Path;
+    dest->LoadPathVector(*pathv);    
+    delete pathv;
+
+    /*gchar *str = dest->svg_dump_path();
+    std::cout << "After conversion:\n" << str << std::endl;
+    g_free(str);*/
+
+    return dest;
+}
+
+/**
+ * Obtains an item's Path before the LPE stack has been applied.
+ */
+Path *
+Path_for_item_before_LPE(SPItem *item, bool doTransformation, bool transformFull)
+{
+    std::unique_ptr<SPCurve> curve = curve_for_item_before_LPE(item);
+
+    if (curve == nullptr)
+        return nullptr;
+    
+    Geom::PathVector *pathv =
+        pathvector_for_curve(item, curve.get(), doTransformation, transformFull, Geom::identity(), Geom::identity());
+    
+    Path *dest = new Path;
+    dest->LoadPathVector(*pathv);
+    delete pathv;
+
+    return dest;
+}
+
+/* 
+ * NOTE: Returns empty pathvector if curve == NULL
+ * TODO: see if calling this method can be optimized. All the pathvector copying might be slow.
+ */
+Geom::PathVector*
+pathvector_for_curve(SPItem *item, SPCurve *curve, bool doTransformation, bool transformFull, Geom::Affine extraPreAffine, Geom::Affine extraPostAffine)
+{
+    if (curve == nullptr)
+        return nullptr;
+
+    Geom::PathVector *dest = new Geom::PathVector;    
+    *dest = curve->get_pathvector(); // Make a copy; must be freed by the caller!
+    
+    if (doTransformation) {
+        if (transformFull) {
+            *dest *= extraPreAffine * item->i2doc_affine() * extraPostAffine;
+        } else {
+            *dest *= extraPreAffine * (Geom::Affine)item->transform * extraPostAffine;
+        }
+    } else {
+        *dest *= extraPreAffine * extraPostAffine;
+    }
+
+    return dest;
+}
+
+/**
+ * Obtains an item's curve. For SPPath, it is the path *before* LPE. For SPShapes other than path, it is the path *after* LPE.
+ * So the result is somewhat ill-defined, and probably this method should not be used... See curve_for_item_before_LPE.
+ */
+std::unique_ptr<SPCurve> curve_for_item(SPItem *item)
+{
+    if (!item) 
+        return nullptr;
+    
+    std::unique_ptr<SPCurve> curve;
+
+    if (auto path = dynamic_cast<SPPath const *>(item)) {
+        curve = SPCurve::copy(path->curveForEdit());
+    } else if (auto shape = dynamic_cast<SPShape const *>(item)) {
+        curve = SPCurve::copy(shape->curve());
+    } else if (SP_IS_TEXT(item) || SP_IS_FLOWTEXT(item)) {
+        curve = te_get_layout(item)->convertToCurves();
+    } else if (auto image = dynamic_cast<SPImage const *>(item)) {
+        curve = image->get_curve();
+    }
+
+    return curve;
+}
+
+/**
+ * Obtains an item's curve *before* LPE.
+ */
+std::unique_ptr<SPCurve> curve_for_item_before_LPE(SPItem *item)
+{
+    if (!item) 
+        return nullptr;
+    
+    std::unique_ptr<SPCurve> curve;
+
+    if (auto shape = dynamic_cast<SPShape const *>(item)) {
+        curve = SPCurve::copy(shape->curveForEdit());
+    } else if (SP_IS_TEXT(item) || SP_IS_FLOWTEXT(item)) {
+        curve = te_get_layout(item)->convertToCurves();
+    } else if (auto image = dynamic_cast<SPImage const *>(item)) {
+        curve = image->get_curve();
+    }
+
+    return curve;
+}
+
+std::optional<Path::cut_position> get_nearest_position_on_Path(Path *path, Geom::Point p, unsigned seg)
+{
+    std::optional<Path::cut_position> result;
+    if (!path) {
+        return result; // returns empty std::optional
+    }
+    //get nearest position on path
+    result = path->PointToCurvilignPosition(p, seg);
+    return result;
+}
+
+Geom::Point get_point_on_Path(Path *path, int piece, double t)
+{
+    Geom::Point p;
+    path->PointAt(piece, t, p);
+    return p;
+}
+
+
+/*
+  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 :