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Diffstat (limited to '')
| -rw-r--r-- | src/object/sp-hatch-path.cpp | 285 |
1 files changed, 285 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..6cf0cdb --- /dev/null +++ b/src/object/sp-hatch-path.cpp @@ -0,0 +1,285 @@ +// 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 "style.h" +#include "svg/svg.h" +#include "display/curve.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() = default; + +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() +{ + views.clear(); + SPObject::release(); +} + +void SPHatchPath::set(SPAttr key, gchar const *value) +{ + switch (key) { + case SPAttr::D: + if (value) { + Geom::PathVector pv; + _readHatchPathVector(value, pv, _continuous); + _curve.emplace(std::move(pv)); + } else { + _curve.reset(); + } + + 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 &v : views) { + v.drawingitem->setStyle(style); + } + } + } + + if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_PARENT_MODIFIED_FLAG)) { + for (auto &v : views) { + _updateView(v); + } + } +} + +bool SPHatchPath::isValid() const +{ + return !_curve || _repeatLength() > 0; +} + +Inkscape::DrawingItem *SPHatchPath::show(Inkscape::Drawing &drawing, unsigned int key, Geom::OptInterval extents) +{ + views.emplace_back(make_drawingitem<Inkscape::DrawingShape>(drawing), extents, key); + auto &v = views.back(); + auto s = v.drawingitem.get(); + + _updateView(v); + + return s; +} + +void SPHatchPath::hide(unsigned int key) +{ + auto it = std::find_if(views.begin(), views.end(), [=] (auto &v) { + return v.key == key; + }); + + if (it != views.end()) { + views.erase(it); + return; + } + + g_assert_not_reached(); +} + +void SPHatchPath::setStripExtents(unsigned int key, Geom::OptInterval const &extents) +{ + for (auto &v : views) { + if (v.key == key) { + v.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); + } + + double 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 (auto const &v : views) { + if (v.key == key) { + return _calculateRenderCurve(v); + } + } + g_assert_not_reached(); + return SPCurve{}; +} + +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.drawingitem->setTransform(offset_transform); + style->fill.setNone(); + view.drawingitem->setStyle(style); + view.drawingitem->setPath(std::make_shared<SPCurve>(std::move(calculated_curve))); +} + +SPCurve SPHatchPath::_calculateRenderCurve(View const &view) const +{ + SPCurve calculated_curve; + + 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; + 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(DrawingItemPtr<Inkscape::DrawingShape> drawingitem, Geom::OptInterval const &extents, unsigned key) + : drawingitem(std::move(drawingitem)) + , extents(extents) + , key(key) {} + +/* + 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 : |