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/dom/SVGAnimatedLength.h"
  10 #include "mozilla/gfx/2D.h"
  11 #include "SVGContentUtils.h"
  12
  13 using namespace mozilla::gfx;
  14
  15 NS_IMPL_NS_NEW_SVG_ELEMENT(Polygon)
  16
  17 namespace mozilla::dom {
  18
  19 JSObject* SVGPolygonElement::WrapNode(JSContext* aCx,
  20                                       JS::Handle<JSObject*> aGivenProto) {
  21   return SVGPolygonElement_Binding::Wrap(aCx, this, aGivenProto);
  22 }
  23
  24 //----------------------------------------------------------------------
  25 // Implementation
  26
  27 SVGPolygonElement::SVGPolygonElement(
  28     already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
  29     : SVGPolygonElementBase(std::move(aNodeInfo)) {}
  30
  31 //----------------------------------------------------------------------
  32 // nsINode methods
  33
  34 NS_IMPL_ELEMENT_CLONE_WITH_INIT(SVGPolygonElement)
  35
  36 //----------------------------------------------------------------------
  37 // SVGGeometryElement methods
  38
  39 void SVGPolygonElement::GetMarkPoints(nsTArray<SVGMark>* aMarks) {
  40   SVGPolyElement::GetMarkPoints(aMarks);
  41
  42   if (aMarks->IsEmpty() || aMarks->LastElement().type != SVGMark::eEnd) {
  43     return;
  44   }
  45
  46   SVGMark* endMark = &aMarks->LastElement();
  47   SVGMark* startMark = &aMarks->ElementAt(0);
  48   float angle =
  49       std::atan2(startMark->y - endMark->y, startMark->x - endMark->x);
  50
  51   endMark->type = SVGMark::eMid;
  52   endMark->angle = SVGContentUtils::AngleBisect(angle, endMark->angle);
  53   startMark->angle = SVGContentUtils::AngleBisect(angle, startMark->angle);
  54   // for a polygon (as opposed to a polyline) there's an implicit extra point
  55   // co-located with the start point that SVGPolyElement::GetMarkPoints
  56   // doesn't return
  57   aMarks->AppendElement(
  58       SVGMark(startMark->x, startMark->y, startMark->angle, SVGMark::eEnd));
  59 }
  60
  61 already_AddRefed<Path> SVGPolygonElement::BuildPath(PathBuilder* aBuilder) {
  62   const SVGPointList& points = mPoints.GetAnimValue();
  63
  64   if (points.IsEmpty()) {
  65     return nullptr;
  66   }
  67
  68   float zoom = UserSpaceMetrics::GetZoom(this);
  69
  70   aBuilder->MoveTo(points[0] * zoom);
  71   for (uint32_t i = 1; i < points.Length(); ++i) {
  72     aBuilder->LineTo(points[i] * zoom);
  73   }
  74
  75   aBuilder->Close();
  76
  77   return aBuilder->Finish();
  78 }
  79
  80 }  // namespace mozilla::dom