/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/dom/SVGPolygonElement.h"

#include "mozilla/dom/SVGPolygonElementBinding.h"

#include "mozilla/gfx/2D.h"

#include "SVGContentUtils.h"

using namespace mozilla;

using namespace mozilla::gfx;

NS_IMPL_NS_NEW_NAMESPACED_SVG_ELEMENT(Polygon)

namespace mozilla {

namespace dom {

JSObject*

SVGPolygonElement::WrapNode(JSContext *aCx, JS::Handle<JSObject*> aGivenProto)

{

  return SVGPolygonElement_Binding::Wrap(aCx, this, aGivenProto);

}

//----------------------------------------------------------------------

// Implementation

SVGPolygonElement::SVGPolygonElement(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)

  : SVGPolygonElementBase(std::move(aNodeInfo))

{

}

//----------------------------------------------------------------------

// nsINode methods

NS_IMPL_ELEMENT_CLONE_WITH_INIT(SVGPolygonElement)

//----------------------------------------------------------------------

// SVGGeometryElement methods

void

SVGPolygonElement::GetMarkPoints(nsTArray<nsSVGMark> *aMarks)

{

  SVGPolyElement::GetMarkPoints(aMarks);

  if (aMarks->IsEmpty() || aMarks->LastElement().type != nsSVGMark::eEnd) {

    return;

  }

  nsSVGMark *endMark = &aMarks->LastElement();

  nsSVGMark *startMark = &aMarks->ElementAt(0);

  float angle = atan2(startMark->y - endMark->y, startMark->x - endMark->x);

  endMark->type = nsSVGMark::eMid;

  endMark->angle = SVGContentUtils::AngleBisect(angle, endMark->angle);

  startMark->angle = SVGContentUtils::AngleBisect(angle, startMark->angle);

  // for a polygon (as opposed to a polyline) there's an implicit extra point

  // co-located with the start point that SVGPolyElement::GetMarkPoints

  // doesn't return

  aMarks->AppendElement(nsSVGMark(startMark->x, startMark->y, startMark->angle,

                                  nsSVGMark::eEnd));

}

already_AddRefed<Path>

SVGPolygonElement::BuildPath(PathBuilder* aBuilder)

{

  const SVGPointList &points = mPoints.GetAnimValue();

  if (points.IsEmpty()) {

    return nullptr;

  }

  aBuilder->MoveTo(points[0]);

  for (uint32_t i = 1; i < points.Length(); ++i) {

    aBuilder->LineTo(points[i]);

  }

  aBuilder->Close();

  return aBuilder->Finish();

}

} // namespace dom

} // namespace mozilla