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Diffstat (limited to 'src/object/sp-ellipse.cpp')
| -rw-r--r-- | src/object/sp-ellipse.cpp | 767 |
1 files changed, 767 insertions, 0 deletions
diff --git a/src/object/sp-ellipse.cpp b/src/object/sp-ellipse.cpp new file mode 100644 index 0000000..a3f04d8 --- /dev/null +++ b/src/object/sp-ellipse.cpp @@ -0,0 +1,767 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * SVG <ellipse> and related implementations + * + * Authors: + * Lauris Kaplinski <lauris@kaplinski.com> + * Mitsuru Oka + * bulia byak <buliabyak@users.sf.net> + * Abhishek Sharma + * + * Copyright (C) 1999-2002 Lauris Kaplinski + * Copyright (C) 2000-2001 Ximian, Inc. + * Copyright (C) 2013 Tavmjong Bah + * + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#include <glibmm.h> +#include <glibmm/i18n.h> + +#include "live_effects/effect.h" +#include "live_effects/lpeobject.h" +#include "live_effects/lpeobject-reference.h" + +#include <2geom/angle.h> +#include <2geom/circle.h> +#include <2geom/ellipse.h> +#include <2geom/path-sink.h> + +#include "attributes.h" +#include "display/curve.h" +#include "document.h" +#include "preferences.h" +#include "snap-candidate.h" +#include "sp-ellipse.h" +#include "style.h" +#include "svg/svg.h" +#include "svg/path-string.h" + +#define SP_2PI (2 * M_PI) + +SPGenericEllipse::SPGenericEllipse() + : SPShape() + , start(0) + , end(SP_2PI) + , type(SP_GENERIC_ELLIPSE_UNDEFINED) + , arc_type(SP_GENERIC_ELLIPSE_ARC_TYPE_SLICE) +{ +} + +SPGenericEllipse::~SPGenericEllipse() += default; + +void SPGenericEllipse::build(SPDocument *document, Inkscape::XML::Node *repr) +{ + // std::cout << "SPGenericEllipse::build: Entrance: " << this->type + // << " (" << g_quark_to_string(repr->code()) << ")" << std::endl; + + switch ( type ) { + case SP_GENERIC_ELLIPSE_ARC: + this->readAttr("sodipodi:cx"); + this->readAttr("sodipodi:cy"); + this->readAttr("sodipodi:rx"); + this->readAttr("sodipodi:ry"); + this->readAttr("sodipodi:start"); + this->readAttr("sodipodi:end"); + this->readAttr("sodipodi:open"); + this->readAttr("sodipodi:arc-type"); + break; + + case SP_GENERIC_ELLIPSE_CIRCLE: + this->readAttr("cx"); + this->readAttr("cy"); + this->readAttr("r"); + break; + + case SP_GENERIC_ELLIPSE_ELLIPSE: + this->readAttr("cx"); + this->readAttr("cy"); + this->readAttr("rx"); + this->readAttr("ry"); + break; + + default: + std::cerr << "SPGenericEllipse::build() unknown defined type." << std::endl; + } + + // std::cout << " cx: " << cx.write() << std::endl; + // std::cout << " cy: " << cy.write() << std::endl; + // std::cout << " rx: " << rx.write() << std::endl; + // std::cout << " ry: " << ry.write() << std::endl; + SPShape::build(document, repr); +} + +void SPGenericEllipse::set(SPAttributeEnum key, gchar const *value) +{ + // There are multiple ways to set internal cx, cy, rx, and ry (via SVG attributes or Sodipodi + // attributes) thus we don't want to unset them if a read fails (e.g., when we explicitly clear + // an attribute by setting it to NULL). + + // We must update the SVGLengths immediately or nodes may be misplaced after they are moved. + double const w = viewport.width(); + double const h = viewport.height(); + double const d = hypot(w, h) / sqrt(2); // diagonal + double const em = style->font_size.computed; + double const ex = em * 0.5; + + SVGLength t; + switch (key) { + case SP_ATTR_CX: + case SP_ATTR_SODIPODI_CX: + if( t.read(value) ) cx = t; + cx.update( em, ex, w ); + this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG); + break; + + case SP_ATTR_CY: + case SP_ATTR_SODIPODI_CY: + if( t.read(value) ) cy = t; + cy.update( em, ex, h ); + this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG); + break; + + case SP_ATTR_RX: + case SP_ATTR_SODIPODI_RX: + if( t.read(value) && t.value > 0.0 ) rx = t; + rx.update( em, ex, w ); + this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG); + break; + + case SP_ATTR_RY: + case SP_ATTR_SODIPODI_RY: + if( t.read(value) && t.value > 0.0 ) ry = t; + ry.update( em, ex, h ); + this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG); + break; + + case SP_ATTR_R: + if( t.read(value) && t.value > 0.0 ) { + this->ry = this->rx = t; + } + rx.update( em, ex, d ); + ry.update( em, ex, d ); + this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG); + break; + + case SP_ATTR_SODIPODI_START: + if (value) { + sp_svg_number_read_d(value, &this->start); + } else { + this->start = 0; + } + this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG); + break; + + case SP_ATTR_SODIPODI_END: + if (value) { + sp_svg_number_read_d(value, &this->end); + } else { + this->end = 2 * M_PI; + } + this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG); + break; + + case SP_ATTR_SODIPODI_OPEN: + // This is for reading in old files. + if ((!value) || strcmp(value,"true")) { + this->arc_type = SP_GENERIC_ELLIPSE_ARC_TYPE_SLICE; + } else { + this->arc_type = SP_GENERIC_ELLIPSE_ARC_TYPE_ARC; + } + this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG); + break; + + case SP_ATTR_SODIPODI_ARC_TYPE: + // To read in old files that use 'open', we need to not set if value is null. + // We could also check inkscape version. + if (value) { + if (!strcmp(value,"arc")) { + this->arc_type = SP_GENERIC_ELLIPSE_ARC_TYPE_ARC; + } else if (!strcmp(value,"chord")) { + this->arc_type = SP_GENERIC_ELLIPSE_ARC_TYPE_CHORD; + } else { + this->arc_type = SP_GENERIC_ELLIPSE_ARC_TYPE_SLICE; + } + } + this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG); + break; + + default: + SPShape::set(key, value); + break; + } +} + +void SPGenericEllipse::update(SPCtx *ctx, guint flags) +{ + // std::cout << "\nSPGenericEllipse::update: Entrance" << std::endl; + if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) { + Geom::Rect const &viewbox = ((SPItemCtx const *) ctx)->viewport; + + double const dx = viewbox.width(); + double const dy = viewbox.height(); + double const dr = hypot(dx, dy) / sqrt(2); + double const em = this->style->font_size.computed; + double const ex = em * 0.5; // fixme: get from pango or libnrtype + + this->cx.update(em, ex, dx); + this->cy.update(em, ex, dy); + this->rx.update(em, ex, dr); + this->ry.update(em, ex, dr); + + this->set_shape(); + } + + SPShape::update(ctx, flags); + // std::cout << "SPGenericEllipse::update: Exit\n" << std::endl; +} + +Inkscape::XML::Node *SPGenericEllipse::write(Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags) +{ + // std::cout << "\nSPGenericEllipse::write: Entrance (" + // << (repr == NULL ? " NULL" : g_quark_to_string(repr->code())) + // << ")" << std::endl; + + GenericEllipseType new_type = SP_GENERIC_ELLIPSE_UNDEFINED; + if (_isSlice() || hasPathEffect() ) { + new_type = SP_GENERIC_ELLIPSE_ARC; + } else if ( rx.computed == ry.computed ) { + new_type = SP_GENERIC_ELLIPSE_CIRCLE; + } else { + new_type = SP_GENERIC_ELLIPSE_ELLIPSE; + } + // std::cout << " new_type: " << new_type << std::endl; + + if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) { + + switch ( new_type ) { + + case SP_GENERIC_ELLIPSE_ARC: + repr = xml_doc->createElement("svg:path"); + break; + case SP_GENERIC_ELLIPSE_CIRCLE: + repr = xml_doc->createElement("svg:circle"); + break; + case SP_GENERIC_ELLIPSE_ELLIPSE: + repr = xml_doc->createElement("svg:ellipse"); + break; + case SP_GENERIC_ELLIPSE_UNDEFINED: + default: + std::cerr << "SPGenericEllipse::write(): unknown type." << std::endl; + } + } + + if (type != new_type) { + switch (new_type) { + case SP_GENERIC_ELLIPSE_ARC: + repr->setCodeUnsafe(g_quark_from_string("svg:path")); + break; + case SP_GENERIC_ELLIPSE_CIRCLE: + repr->setCodeUnsafe(g_quark_from_string("svg:circle")); + break; + case SP_GENERIC_ELLIPSE_ELLIPSE: + repr->setCodeUnsafe(g_quark_from_string("svg:ellipse")); + break; + default: + std::cerr << "SPGenericEllipse::write(): unknown type." << std::endl; + } + type = new_type; + } + + // std::cout << " type: " << g_quark_to_string( repr->code() ) << std::endl; + // std::cout << " cx: " << cx.write() << " " << cx.computed + // << " cy: " << cy.write() << " " << cy.computed + // << " rx: " << rx.write() << " " << rx.computed + // << " ry: " << ry.write() << " " << ry.computed << std::endl; + + switch ( type ) { + case SP_GENERIC_ELLIPSE_UNDEFINED: + case SP_GENERIC_ELLIPSE_ARC: + + repr->removeAttribute("cx"); + repr->removeAttribute("cy"); + repr->removeAttribute("rx"); + repr->removeAttribute("ry"); + repr->removeAttribute("r"); + + if (flags & SP_OBJECT_WRITE_EXT) { + + repr->setAttribute("sodipodi:type", "arc"); + sp_repr_set_svg_length(repr, "sodipodi:cx", cx); + sp_repr_set_svg_length(repr, "sodipodi:cy", cy); + sp_repr_set_svg_length(repr, "sodipodi:rx", rx); + sp_repr_set_svg_length(repr, "sodipodi:ry", ry); + + // write start and end only if they are non-trivial; otherwise remove + if (_isSlice()) { + sp_repr_set_svg_double(repr, "sodipodi:start", start); + sp_repr_set_svg_double(repr, "sodipodi:end", end); + + switch ( arc_type ) { + case SP_GENERIC_ELLIPSE_ARC_TYPE_SLICE: + repr->removeAttribute("sodipodi:open"); // For backwards compat. + repr->setAttribute("sodipodi:arc-type", "slice"); + break; + case SP_GENERIC_ELLIPSE_ARC_TYPE_CHORD: + // A chord's path isn't "open" but its fill most closely resembles an arc. + repr->setAttribute("sodipodi:open", "true"); // For backwards compat. + repr->setAttribute("sodipodi:arc-type", "chord"); + break; + case SP_GENERIC_ELLIPSE_ARC_TYPE_ARC: + repr->setAttribute("sodipodi:open", "true"); // For backwards compat. + repr->setAttribute("sodipodi:arc-type", "arc"); + break; + default: + std::cerr << "SPGenericEllipse::write: unknown arc-type." << std::endl; + } + } else { + repr->removeAttribute("sodipodi:end"); + repr->removeAttribute("sodipodi:start"); + repr->removeAttribute("sodipodi:open"); + repr->removeAttribute("sodipodi:arc-type"); + } + } + + // write d= + set_elliptical_path_attribute(repr); + break; + + case SP_GENERIC_ELLIPSE_CIRCLE: + sp_repr_set_svg_length(repr, "cx", cx); + sp_repr_set_svg_length(repr, "cy", cy); + sp_repr_set_svg_length(repr, "r", rx); + repr->removeAttribute("rx"); + repr->removeAttribute("ry"); + repr->removeAttribute("sodipodi:cx"); + repr->removeAttribute("sodipodi:cy"); + repr->removeAttribute("sodipodi:rx"); + repr->removeAttribute("sodipodi:ry"); + repr->removeAttribute("sodipodi:end"); + repr->removeAttribute("sodipodi:start"); + repr->removeAttribute("sodipodi:open"); + repr->removeAttribute("sodipodi:arc-type"); + repr->removeAttribute("sodipodi:type"); + repr->removeAttribute("d"); + break; + + case SP_GENERIC_ELLIPSE_ELLIPSE: + sp_repr_set_svg_length(repr, "cx", cx); + sp_repr_set_svg_length(repr, "cy", cy); + sp_repr_set_svg_length(repr, "rx", rx); + sp_repr_set_svg_length(repr, "ry", ry); + repr->removeAttribute("r"); + repr->removeAttribute("sodipodi:cx"); + repr->removeAttribute("sodipodi:cy"); + repr->removeAttribute("sodipodi:rx"); + repr->removeAttribute("sodipodi:ry"); + repr->removeAttribute("sodipodi:end"); + repr->removeAttribute("sodipodi:start"); + repr->removeAttribute("sodipodi:open"); + repr->removeAttribute("sodipodi:arc-type"); + repr->removeAttribute("sodipodi:type"); + repr->removeAttribute("d"); + break; + + default: + std::cerr << "SPGenericEllipse::write: unknown type." << std::endl; + } + + set_shape(); // evaluate SPCurve + + SPShape::write(xml_doc, repr, flags); + + return repr; +} + +const char *SPGenericEllipse::displayName() const +{ + + switch ( type ) { + case SP_GENERIC_ELLIPSE_UNDEFINED: + case SP_GENERIC_ELLIPSE_ARC: + + if (_isSlice()) { + switch ( arc_type ) { + case SP_GENERIC_ELLIPSE_ARC_TYPE_SLICE: + return _("Slice"); + break; + case SP_GENERIC_ELLIPSE_ARC_TYPE_CHORD: + return _("Chord"); + break; + case SP_GENERIC_ELLIPSE_ARC_TYPE_ARC: + return _("Arc"); + break; + } + } else { + return _("Ellipse"); + } + + case SP_GENERIC_ELLIPSE_CIRCLE: + return _("Circle"); + + case SP_GENERIC_ELLIPSE_ELLIPSE: + return _("Ellipse"); + + default: + return "Unknown ellipse: ERROR"; + } + return ("Shouldn't be here"); +} + +// Create path for rendering shape on screen +void SPGenericEllipse::set_shape() +{ + // std::cout << "SPGenericEllipse::set_shape: Entrance" << std::endl; + if (hasBrokenPathEffect()) { + g_warning("The ellipse shape has unknown LPE on it! Convert to path to make it editable preserving the appearance; editing it as ellipse will remove the bad LPE"); + + if (this->getRepr()->attribute("d")) { + // unconditionally read the curve from d, if any, to preserve appearance + Geom::PathVector pv = sp_svg_read_pathv(this->getRepr()->attribute("d")); + SPCurve *cold = new SPCurve(pv); + this->setCurveInsync(cold); + cold->unref(); + } + + return; + } + if (Geom::are_near(this->rx.computed, 0) || Geom::are_near(this->ry.computed, 0)) { + return; + } + + this->normalize(); + + SPCurve *c = nullptr; + + // For simplicity, we use a circle with center (0, 0) and radius 1 for our calculations. + Geom::Circle circle(0, 0, 1); + + if (!this->_isSlice()) { + start = 0.0; + end = 2.0*M_PI; + } + double incr = end - start; // arc angle + if (incr < 0.0) incr += 2.0*M_PI; + + int numsegs = 1 + int(incr*2.0/M_PI); // number of arc segments + if (numsegs > 4) numsegs = 4; + + incr = incr/numsegs; // limit arc angle to less than 90 degrees + Geom::Path path(Geom::Point::polar(start)); + Geom::EllipticalArc* arc; + for (int seg = 0; seg < numsegs; seg++) { + arc = circle.arc(Geom::Point::polar(start + seg*incr), Geom::Point::polar(start + (seg + 0.5)*incr), Geom::Point::polar(start + (seg + 1.0)*incr)); + path.append(*arc); + delete arc; + } + Geom::PathBuilder pb; + pb.append(path); + if (this->_isSlice() && this->arc_type == SP_GENERIC_ELLIPSE_ARC_TYPE_SLICE) { + pb.lineTo(Geom::Point(0, 0)); + } + + if ((this->arc_type != SP_GENERIC_ELLIPSE_ARC_TYPE_ARC) || (this->type != SP_GENERIC_ELLIPSE_ARC)) { + pb.closePath(); + } else { + pb.flush(); + } + c = new SPCurve(pb.peek()); + + // gchar *str = sp_svg_write_path(curve->get_pathvector()); + // std::cout << " path: " << str << std::endl; + // g_free(str); + + // Stretching / moving the calculated shape to fit the actual dimensions. + Geom::Affine aff = Geom::Scale(rx.computed, ry.computed) * Geom::Translate(cx.computed, cy.computed); + c->transform(aff); + + /* Reset the shape's curve to the "original_curve" + * This is very important for LPEs to work properly! (the bbox might be recalculated depending on the curve in shape)*/ + SPCurve * before = this->getCurveBeforeLPE(); + bool haslpe = this->hasPathEffectOnClipOrMaskRecursive(this); + if (before || haslpe) { + if (c && before && before->get_pathvector() != c->get_pathvector()){ + this->setCurveBeforeLPE(c); + sp_lpe_item_update_patheffect(this, true, false); + } else if(haslpe) { + this->setCurveBeforeLPE(c); + } else { + //This happends on undo, fix bug:#1791784 + this->setCurveInsync(c); + } + } else { + this->setCurveInsync(c); + } + + if (before) { + before->unref(); + } + c->unref(); +} + +Geom::Affine SPGenericEllipse::set_transform(Geom::Affine const &xform) +{ + notifyTransform(xform); + if (pathEffectsEnabled() && !optimizeTransforms()) { + return xform; + } + + /* Calculate ellipse start in parent coords. */ + Geom::Point pos(Geom::Point(this->cx.computed, this->cy.computed) * xform); + + /* This function takes care of translation and scaling, we return whatever parts we can't + handle. */ + Geom::Affine ret(Geom::Affine(xform).withoutTranslation()); + gdouble const sw = hypot(ret[0], ret[1]); + gdouble const sh = hypot(ret[2], ret[3]); + + if (sw > 1e-9) { + ret[0] /= sw; + ret[1] /= sw; + } else { + ret[0] = 1.0; + ret[1] = 0.0; + } + + if (sh > 1e-9) { + ret[2] /= sh; + ret[3] /= sh; + } else { + ret[2] = 0.0; + ret[3] = 1.0; + } + + if (this->rx._set) { + this->rx.scale( sw ); + } + + if (this->ry._set) { + this->ry.scale( sh ); + } + + /* Find start in item coords */ + pos = pos * ret.inverse(); + this->cx = pos[Geom::X]; + this->cy = pos[Geom::Y]; + + this->set_shape(); + + // Adjust stroke width + this->adjust_stroke(sqrt(fabs(sw * sh))); + + // Adjust pattern fill + this->adjust_pattern(xform * ret.inverse()); + + // Adjust gradient fill + this->adjust_gradient(xform * ret.inverse()); + + return ret; +} + +void SPGenericEllipse::snappoints(std::vector<Inkscape::SnapCandidatePoint> &p, Inkscape::SnapPreferences const *snapprefs) const +{ + // CPPIFY: is this call necessary? + const_cast<SPGenericEllipse*>(this)->normalize(); + + Geom::Affine const i2dt = this->i2dt_affine(); + + // Snap to the 4 quadrant points of the ellipse, but only if the arc + // spans far enough to include them + if (snapprefs->isTargetSnappable(Inkscape::SNAPTARGET_ELLIPSE_QUADRANT_POINT)) { + for (double angle = 0; angle < SP_2PI; angle += M_PI_2) { + if (Geom::AngleInterval(this->start, this->end, true).contains(angle)) { + Geom::Point pt = this->getPointAtAngle(angle) * i2dt; + p.emplace_back(pt, Inkscape::SNAPSOURCE_ELLIPSE_QUADRANT_POINT, Inkscape::SNAPTARGET_ELLIPSE_QUADRANT_POINT); + } + } + } + + double cx = this->cx.computed; + double cy = this->cy.computed; + + + bool slice = this->_isSlice(); + + // Add the centre, if we have a closed slice or when explicitly asked for + if (snapprefs->isTargetSnappable(Inkscape::SNAPTARGET_NODE_CUSP) && slice && + this->arc_type == SP_GENERIC_ELLIPSE_ARC_TYPE_SLICE) { + Geom::Point pt = Geom::Point(cx, cy) * i2dt; + p.emplace_back(pt, Inkscape::SNAPSOURCE_NODE_CUSP, Inkscape::SNAPTARGET_NODE_CUSP); + } + + if (snapprefs->isTargetSnappable(Inkscape::SNAPTARGET_OBJECT_MIDPOINT)) { + Geom::Point pt = Geom::Point(cx, cy) * i2dt; + p.emplace_back(pt, Inkscape::SNAPSOURCE_OBJECT_MIDPOINT, Inkscape::SNAPTARGET_OBJECT_MIDPOINT); + } + + // And if we have a slice, also snap to the endpoints + if (snapprefs->isTargetSnappable(Inkscape::SNAPTARGET_NODE_CUSP) && slice) { + // Add the start point, if it's not coincident with a quadrant point + if (!Geom::are_near(std::fmod(this->start, M_PI_2), 0)) { + Geom::Point pt = this->getPointAtAngle(this->start) * i2dt; + p.emplace_back(pt, Inkscape::SNAPSOURCE_NODE_CUSP, Inkscape::SNAPTARGET_NODE_CUSP); + } + + // Add the end point, if it's not coincident with a quadrant point + if (!Geom::are_near(std::fmod(this->end, M_PI_2), 0)) { + Geom::Point pt = this->getPointAtAngle(this->end) * i2dt; + p.emplace_back(pt, Inkscape::SNAPSOURCE_NODE_CUSP, Inkscape::SNAPTARGET_NODE_CUSP); + } + } +} + +void SPGenericEllipse::modified(guint flags) +{ + if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) { + this->set_shape(); + } + + SPShape::modified(flags); +} + +void SPGenericEllipse::update_patheffect(bool write) { + SPShape::update_patheffect(write); +} + +void SPGenericEllipse::normalize() +{ + Geom::AngleInterval a(this->start, this->end, true); + + this->start = a.initialAngle().radians0(); + this->end = a.finalAngle().radians0(); +} + +Geom::Point SPGenericEllipse::getPointAtAngle(double arg) const +{ + return Geom::Point::polar(arg) * Geom::Scale(rx.computed, ry.computed) * Geom::Translate(cx.computed, cy.computed); +} + +/* + * set_elliptical_path_attribute: + * + * Convert center to endpoint parameterization and set it to repr. + * + * See SVG 1.0 Specification W3C Recommendation + * ``F.6 Elliptical arc implementation notes'' for more detail. + */ +bool SPGenericEllipse::set_elliptical_path_attribute(Inkscape::XML::Node *repr) +{ + // Make sure our pathvector is up to date. + this->set_shape(); + + if (_curve) { + gchar* d = sp_svg_write_path(_curve->get_pathvector()); + + repr->setAttribute("d", d); + + g_free(d); + } else { + repr->removeAttribute("d"); + } + + return true; +} + +void SPGenericEllipse::position_set(gdouble x, gdouble y, gdouble rx, gdouble ry) +{ + this->cx = x; + this->cy = y; + this->rx = rx; + this->ry = ry; + + Inkscape::Preferences * prefs = Inkscape::Preferences::get(); + + // those pref values are in degrees, while we want radians + if (prefs->getDouble("/tools/shapes/arc/start", 0.0) != 0) { + this->start = Geom::Angle::from_degrees(prefs->getDouble("/tools/shapes/arc/start", 0.0)).radians0(); + } + + if (prefs->getDouble("/tools/shapes/arc/end", 0.0) != 0) { + this->end = Geom::Angle::from_degrees(prefs->getDouble("/tools/shapes/arc/end", 0.0)).radians0(); + } + + this->arc_type = (GenericEllipseArcType)prefs->getInt("/tools/shapes/arc/arc_type", 0); + if (_isSlice()) { + this->type = SP_GENERIC_ELLIPSE_ARC; + } + + this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG); +} + +bool SPGenericEllipse::_isSlice() const +{ + Geom::AngleInterval a(this->start, this->end, true); + + return !(Geom::are_near(a.extent(), 0) || Geom::are_near(a.extent(), SP_2PI)); +} + +/** +Returns the ratio in which the vector from p0 to p1 is stretched by transform + */ +gdouble SPGenericEllipse::vectorStretch(Geom::Point p0, Geom::Point p1, Geom::Affine xform) { + if (p0 == p1) { + return 0; + } + + return (Geom::distance(p0 * xform, p1 * xform) / Geom::distance(p0, p1)); +} + +void SPGenericEllipse::setVisibleRx(gdouble rx) { + if (rx == 0) { + this->rx.unset(); + } else { + this->rx = rx / SPGenericEllipse::vectorStretch( + Geom::Point(this->cx.computed + 1, this->cy.computed), + Geom::Point(this->cx.computed, this->cy.computed), + this->i2doc_affine()); + } + + this->updateRepr(); +} + +void SPGenericEllipse::setVisibleRy(gdouble ry) { + if (ry == 0) { + this->ry.unset(); + } else { + this->ry = ry / SPGenericEllipse::vectorStretch( + Geom::Point(this->cx.computed, this->cy.computed + 1), + Geom::Point(this->cx.computed, this->cy.computed), + this->i2doc_affine()); + } + + this->updateRepr(); +} + +gdouble SPGenericEllipse::getVisibleRx() const { + if (!this->rx._set) { + return 0; + } + + return this->rx.computed * SPGenericEllipse::vectorStretch( + Geom::Point(this->cx.computed + 1, this->cy.computed), + Geom::Point(this->cx.computed, this->cy.computed), + this->i2doc_affine()); +} + +gdouble SPGenericEllipse::getVisibleRy() const { + if (!this->ry._set) { + return 0; + } + + return this->ry.computed * SPGenericEllipse::vectorStretch( + Geom::Point(this->cx.computed, this->cy.computed + 1), + Geom::Point(this->cx.computed, this->cy.computed), + this->i2doc_affine()); +} + +/* + 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 : |