Merged hatch rendering code

(bzr r13611.1.8)

1 files changed, 290 insertions, 0 deletions

diff --git a/src/sp-hatch-path.cpp b/src/sp-hatch-path.cpp
new file mode 100644
index 000000000..bdefd32d8
--- /dev/null
+++ b/src/sp-hatch-path.cpp
@@ -0,0 +1,290 @@
+/** @file
+ * SVG <hatchPath> implementation
+ *//*
+ * Author:
+ *   Tomasz Boczkowski <penginsbacon@gmail.com>
+ *
+ * Copyright (C) 2014 Tomasz Boczkowski
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <cstring>
+#include <string>
+#include <2geom/path.h>
+#include <2geom/transforms.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 "attributes.h"
+#include "document-private.h"
+#include "uri.h"
+#include "style.h"
+#include "sp-hatch-path.h"
+#include "svg/css-ostringstream.h"
+#include "xml/repr.h"
+
+#include "sp-factory.h"
+
+namespace {
+SPObject* createHatchPath() {
+    return new SPHatchPath();
+}
+
+bool hatchRegistered = SPFactory::instance().registerObject("svg:hatchPath", createHatchPath);
+}
+
+SPHatchPath::SPHatchPath()
+    : _curve(NULL)
+{
+    offset.unset();
+}
+
+SPHatchPath::~SPHatchPath() {
+}
+
+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();
+        }
+    }
+
+    this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+}
+
+void SPHatchPath::build(SPDocument* doc, Inkscape::XML::Node* repr) {
+    SPObject::build(doc, repr);
+
+    this->readAttr("d");
+    this->readAttr("offset");
+    this->readAttr( "style" );
+
+    style->fill.setNone();
+}
+
+void SPHatchPath::release() {
+    for (ViewIterator iter = _display.begin(); iter != _display.end(); iter++) {
+        delete iter->arenaitem;
+        iter->arenaitem = NULL;
+    }
+
+    SPObject::release();
+}
+
+void SPHatchPath::set(unsigned int 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) {
+                this->setCurve(curve, true);
+                curve->unref();
+            }
+        } else {
+            this->setCurve(NULL, true);
+        }
+
+        this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+        break;
+
+    case SP_ATTR_OFFSET:
+        offset.readOrUnset(value);
+        this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+        break;
+
+    default:
+        if (SP_ATTRIBUTE_IS_CSS(key)) {
+            sp_style_read_from_object(this->style, this);
+            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 (this->style->stroke_width.unit == SP_CSS_UNIT_PERCENT) {
+            SPItemCtx *ictx = (SPItemCtx *) ctx;
+            double const aw = 1.0 / ictx->i2vp.descrim();
+            this->style->stroke_width.computed = this->style->stroke_width.value * aw;
+
+            for (ViewIterator iter = _display.begin(); iter != _display.end(); iter++) {
+                iter->arenaitem->setStyle(this->style);
+            }
+        }
+    }
+
+    if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_PARENT_MODIFIED_FLAG)) {
+        for (ViewIterator iter = _display.begin(); iter != _display.end(); iter++) {
+            _updateView(*iter);
+        }
+    }
+}
+
+bool SPHatchPath::isValid() const {
+    if (_curve && (_repeatLength() <= 0)) {
+        return false;
+    }
+    return true;
+}
+
+Inkscape::DrawingItem *SPHatchPath::show(Inkscape::Drawing &drawing, unsigned int key) {
+    Inkscape::DrawingShape *s = new Inkscape::DrawingShape(drawing);
+    _display.push_front(View(s, key));
+
+    _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 (ViewIterator iter = _display.begin(); iter != _display.end(); iter++) {
+        if (iter->key == key) {
+            iter->extents = extents;
+            break;
+        }
+    }
+}
+
+gdouble SPHatchPath::_repeatLength() const {
+    if (!_curve) {
+        return 0;
+    }
+
+    if (!_curve->last_point()) {
+        return 0;
+    }
+
+    return _curve->last_point()->y();
+}
+
+void SPHatchPath::_updateView(View &view) {
+    SPCurve *calculated_curve = new SPCurve;
+
+    if (!view.extents) {
+        return;
+    }
+
+    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();
+        }
+    }
+
+    Geom::Affine offset_transform = Geom::Translate(offset.computed, 0);
+    view.arenaitem->setTransform(offset_transform);
+    style->fill.setNone();
+    view.arenaitem->setStyle(this->style);
+    view.arenaitem->setPath(calculated_curve);
+
+    calculated_curve->unref();
+}
+
+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), 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 :