dom/svg/SVGPolygonElement.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/dom/SVGPolygonElement.h"
   8 #include "mozilla/dom/SVGPolygonElementBinding.h"
   9 #include "mozilla/gfx/2D.h"
  10 #include "SVGContentUtils.h"
  11
  12 using namespace mozilla::gfx;
  13
  14 NS_IMPL_NS_NEW_SVG_ELEMENT(Polygon)
  15
  16 namespace mozilla::dom {
  17
  18 JSObject* SVGPolygonElement::WrapNode(JSContext* aCx,
  19                                       JS::Handle<JSObject*> aGivenProto) {
  20   return SVGPolygonElement_Binding::Wrap(aCx, this, aGivenProto);
  21 }
  22
  23 //----------------------------------------------------------------------
  24 // Implementation
  25
  26 SVGPolygonElement::SVGPolygonElement(
  27     already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
  28     : SVGPolygonElementBase(std::move(aNodeInfo)) {}
  29
  30 //----------------------------------------------------------------------
  31 // nsINode methods
  32
  33 NS_IMPL_ELEMENT_CLONE_WITH_INIT(SVGPolygonElement)
  34
  35 //----------------------------------------------------------------------
  36 // SVGGeometryElement methods
  37
  38 void SVGPolygonElement::GetMarkPoints(nsTArray<SVGMark>* aMarks) {
  39   SVGPolyElement::GetMarkPoints(aMarks);
  40
  41   if (aMarks->IsEmpty() || aMarks->LastElement().type != SVGMark::eEnd) {
  42     return;
  43   }
  44
  45   SVGMark* endMark = &aMarks->LastElement();
  46   SVGMark* startMark = &aMarks->ElementAt(0);
  47   float angle =
  48       std::atan2(startMark->y - endMark->y, startMark->x - endMark->x);
  49
  50   endMark->type = SVGMark::eMid;
  51   endMark->angle = SVGContentUtils::AngleBisect(angle, endMark->angle);
  52   startMark->angle = SVGContentUtils::AngleBisect(angle, startMark->angle);
  53   // for a polygon (as opposed to a polyline) there's an implicit extra point
  54   // co-located with the start point that SVGPolyElement::GetMarkPoints
  55   // doesn't return
  56   aMarks->AppendElement(
  57       SVGMark(startMark->x, startMark->y, startMark->angle, SVGMark::eEnd));
  58 }
  59
  60 already_AddRefed<Path> SVGPolygonElement::BuildPath(PathBuilder* aBuilder) {
  61   const SVGPointList& points = mPoints.GetAnimValue();
  62
  63   if (points.IsEmpty()) {
  64     return nullptr;
  65   }
  66
  67   aBuilder->MoveTo(points[0]);
  68   for (uint32_t i = 1; i < points.Length(); ++i) {
  69     aBuilder->LineTo(points[i]);
  70   }
  71
  72   aBuilder->Close();
  73
  74   return aBuilder->Finish();
  75 }
  76
  77 }  // namespace mozilla::dom