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-rw-r--r--src/object/sp-hatch-path.cpp313
1 files changed, 313 insertions, 0 deletions
diff --git a/src/object/sp-hatch-path.cpp b/src/object/sp-hatch-path.cpp
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+++ b/src/object/sp-hatch-path.cpp
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+// 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::build(SPDocument* doc, Inkscape::XML::Node* repr)
+{
+ SPObject::build(doc, repr);
+
+ readAttr(SPAttr::D);
+ readAttr(SPAttr::OFFSET);
+ readAttr(SPAttr::STYLE);
+
+ style->fill.setNone();
+}
+
+void SPHatchPath::release()
+{
+ for (auto & iter : _display) {
+ delete iter.arenaitem;
+ iter.arenaitem = nullptr;
+ }
+
+ SPObject::release();
+}
+
+void SPHatchPath::set(SPAttr key, const gchar* value)
+{
+ switch (key) {
+ case SPAttr::D:
+ if (value) {
+ Geom::PathVector pv;
+ _readHatchPathVector(value, pv, _continuous);
+ _curve.reset(new SPCurve(pv));
+ } else {
+ _curve.reset(nullptr);
+ }
+
+ requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+ break;
+
+ case SPAttr::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;
+}
+
+std::unique_ptr<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)
+{
+ auto 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.get());
+}
+
+std::unique_ptr<SPCurve> SPHatchPath::_calculateRenderCurve(View const &view) const
+{
+ auto calculated_curve = std::make_unique<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;
+
+ auto 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);
+ } else {
+ calculated_curve->append(*segment);
+ }
+ segment->transform(step_transform);
+ }
+ }
+ }
+ 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 :
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