1 files changed, 339 insertions, 0 deletions
diff --git a/src/object/sp-hatch-path.cpp b/src/object/sp-hatch-path.cpp
new file mode 100644
index 0000000..2b04ef7
--- /dev/null
+++ b/src/object/sp-hatch-path.cpp
@@ -0,0 +1,339 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/**
+ * @file
+ * SVG <hatchPath> implementation
+ */
+/*
+ * Author:
+ *   Tomasz Boczkowski <penginsbacon@gmail.com>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2014 Tomasz Boczkowski
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <string>
+#include <2geom/path.h>
+
+#include "svg/svg.h"
+#include "display/cairo-utils.h"
+#include "display/curve.h"
+#include "display/drawing-context.h"
+#include "display/drawing-surface.h"
+#include "display/drawing.h"
+#include "display/drawing-shape.h"
+#include "helper/geom.h"
+#include "attributes.h"
+#include "sp-item.h"
+#include "sp-hatch-path.h"
+#include "svg/css-ostringstream.h"
+
+SPHatchPath::SPHatchPath()
+    : offset(),
+      _display(),
+      _curve(nullptr),
+      _continuous(false)
+{
+    offset.unset();
+}
+
+SPHatchPath::~SPHatchPath()
+= default;
+
+void SPHatchPath::setCurve(SPCurve *new_curve, bool owner)
+{
+    if (_curve) {
+        _curve = _curve->unref();
+    }
+
+    if (new_curve) {
+        if (owner) {
+            _curve = new_curve->ref();
+        } else {
+            _curve = new_curve->copy();
+        }
+    }
+
+    requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+}
+
+void SPHatchPath::build(SPDocument* doc, Inkscape::XML::Node* repr)
+{
+    SPObject::build(doc, repr);
+
+    readAttr("d");
+    readAttr("offset");
+    readAttr( "style" );
+
+    style->fill.setNone();
+}
+
+void SPHatchPath::release()
+{
+    for (auto & iter : _display) {
+        delete iter.arenaitem;
+        iter.arenaitem = nullptr;
+    }
+
+    SPObject::release();
+}
+
+void SPHatchPath::set(SPAttributeEnum key, const gchar* value)
+{
+    switch (key) {
+    case SP_ATTR_D:
+        if (value) {
+            Geom::PathVector pv;
+            _readHatchPathVector(value, pv, _continuous);
+            SPCurve *curve = new SPCurve(pv);
+
+            if (curve) {
+                setCurve(curve, true);
+                curve->unref();
+            }
+        } else {
+            setCurve(nullptr, true);
+        }
+
+        requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+        break;
+
+    case SP_ATTR_OFFSET:
+        offset.readOrUnset(value);
+        requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+        break;
+
+    default:
+        if (SP_ATTRIBUTE_IS_CSS(key)) {
+            style->clear(key);
+            requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
+        } else {
+            SPObject::set(key, value);
+        }
+        break;
+    }
+}
+
+
+void SPHatchPath::update(SPCtx* ctx, unsigned int flags)
+{
+    if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {
+        flags &= ~SP_OBJECT_USER_MODIFIED_FLAG_B;
+    }
+
+    if (flags & (SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {
+        if (style->stroke_width.unit == SP_CSS_UNIT_PERCENT) {
+            //TODO: Check specification
+
+            SPItemCtx *ictx = static_cast<SPItemCtx *>(ctx);
+            double const aw = (ictx) ? 1.0 / ictx->i2vp.descrim() : 1.0;
+            style->stroke_width.computed = style->stroke_width.value * aw;
+
+            for (auto & iter : _display) {
+                iter.arenaitem->setStyle(style);
+            }
+        }
+    }
+
+    if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_PARENT_MODIFIED_FLAG)) {
+        for (auto & iter : _display) {
+            _updateView(iter);
+        }
+    }
+}
+
+bool SPHatchPath::isValid() const
+{
+    if (_curve && (_repeatLength() <= 0)) {
+        return false;
+    } else {
+        return true;
+    }
+}
+
+Inkscape::DrawingItem *SPHatchPath::show(Inkscape::Drawing &drawing, unsigned int key, Geom::OptInterval extents)
+{
+    Inkscape::DrawingShape *s = new Inkscape::DrawingShape(drawing);
+    _display.push_front(View(s, key));
+    _display.front().extents = extents;
+
+    _updateView(_display.front());
+
+    return s;
+}
+
+void SPHatchPath::hide(unsigned int key)
+{
+    for (ViewIterator iter = _display.begin(); iter != _display.end(); ++iter) {
+        if (iter->key == key) {
+            delete iter->arenaitem;
+            _display.erase(iter);
+            return;
+        }
+    }
+
+    g_assert_not_reached();
+}
+
+void SPHatchPath::setStripExtents(unsigned int key, Geom::OptInterval const &extents)
+{
+    for (auto & iter : _display) {
+        if (iter.key == key) {
+            iter.extents = extents;
+            break;
+        }
+    }
+}
+
+Geom::Interval SPHatchPath::bounds() const
+{
+    Geom::OptRect bbox;
+    Geom::Interval result;
+
+    Geom::Affine transform = Geom::Translate(offset.computed, 0);
+    if (!_curve) {
+        SPCurve test_curve;
+        test_curve.moveto(Geom::Point(0, 0));
+        test_curve.moveto(Geom::Point(0, 1));
+        bbox = bounds_exact_transformed(test_curve.get_pathvector(), transform);
+    } else {
+        bbox = bounds_exact_transformed(_curve->get_pathvector(), transform);
+    }
+
+    gdouble stroke_width = style->stroke_width.computed;
+    result.setMin(bbox->left() - stroke_width / 2);
+    result.setMax(bbox->right() + stroke_width / 2);
+    return result;
+}
+
+SPCurve *SPHatchPath::calculateRenderCurve(unsigned key) const
+{
+    for (const auto & iter : _display) {
+        if (iter.key == key) {
+            return _calculateRenderCurve(iter);
+        }
+    }
+    g_assert_not_reached();
+    return nullptr;
+}
+
+gdouble SPHatchPath::_repeatLength() const
+{
+    gdouble val = 0;
+
+    if (_curve && _curve->last_point()) {
+        val = _curve->last_point()->y();
+    }
+
+    return val;
+}
+
+void SPHatchPath::_updateView(View &view)
+{
+    SPCurve *calculated_curve = _calculateRenderCurve(view);
+
+    Geom::Affine offset_transform = Geom::Translate(offset.computed, 0);
+    view.arenaitem->setTransform(offset_transform);
+    style->fill.setNone();
+    view.arenaitem->setStyle(style);
+    view.arenaitem->setPath(calculated_curve);
+
+    calculated_curve->unref();
+}
+
+SPCurve *SPHatchPath::_calculateRenderCurve(View const &view) const
+{
+    SPCurve *calculated_curve = new SPCurve;
+
+    if (!view.extents) {
+        return calculated_curve;
+    }
+
+    if (!_curve) {
+        calculated_curve->moveto(0, view.extents->min());
+        calculated_curve->lineto(0, view.extents->max());
+        //TODO: if hatch has a dasharray defined, adjust line ends
+    } else {
+        gdouble repeatLength = _repeatLength();
+        if (repeatLength > 0) {
+            gdouble initial_y = floor(view.extents->min() / repeatLength) * repeatLength;
+            int segment_cnt = ceil((view.extents->extent()) / repeatLength) + 1;
+
+            SPCurve *segment =_curve->copy();
+            segment->transform(Geom::Translate(0, initial_y));
+
+            Geom::Affine step_transform = Geom::Translate(0, repeatLength);
+            for (int i = 0; i < segment_cnt; ++i) {
+                if (_continuous) {
+                    calculated_curve->append_continuous(segment, 0.0625);
+                } else {
+                    calculated_curve->append(segment, false);
+                }
+                segment->transform(step_transform);
+            }
+
+            segment->unref();
+        }
+    }
+    return calculated_curve;
+}
+
+
+void SPHatchPath::_readHatchPathVector(char const *str, Geom::PathVector &pathv, bool &continous_join)
+{
+    if (!str) {
+        return;
+    }
+
+    pathv = sp_svg_read_pathv(str);
+
+    if (!pathv.empty()) {
+        continous_join = false;
+    } else {
+        Glib::ustring str2 = Glib::ustring::compose("M0,0 %1", str);
+        pathv = sp_svg_read_pathv(str2.c_str());
+        if (pathv.empty()) {
+            return;
+        }
+
+        gdouble last_point_x = pathv.back().finalPoint().x();
+        Inkscape::CSSOStringStream stream;
+        stream << last_point_x;
+        Glib::ustring str3 = Glib::ustring::compose("M%1,0 %2", stream.str(), str);
+        Geom::PathVector pathv3 = sp_svg_read_pathv(str3.c_str());
+
+        //Path can be composed of relative commands only. In this case final point
+        //coordinates would depend on first point position. If this happens, fall
+        //back to using 0,0 as first path point
+        if (pathv3.back().finalPoint().y() == pathv.back().finalPoint().y()) {
+            pathv = pathv3;
+        }
+        continous_join = true;
+    }
+}
+
+SPHatchPath::View::View(Inkscape::DrawingShape *arenaitem, int key)
+    : arenaitem(arenaitem),
+      extents(),
+      key(key)
+{
+}
+
+SPHatchPath::View::~View()
+{
+    // remember, do not delete arenaitem here
+    arenaitem = nullptr;
+}
+
+
+/*
+ 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 :