dom/svg/SVGPolyElement.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 "SVGPolyElement.h"
   8 #include "DOMSVGPointList.h"
   9 #include "mozilla/gfx/2D.h"
  10 #include "SVGContentUtils.h"
  11
  12 using namespace mozilla::gfx;
  13
  14 namespace mozilla::dom {
  15
  16 //----------------------------------------------------------------------
  17 // Implementation
  18
  19 SVGPolyElement::SVGPolyElement(
  20     already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
  21     : SVGPolyElementBase(std::move(aNodeInfo)) {}
  22
  23 already_AddRefed<DOMSVGPointList> SVGPolyElement::Points() {
  24   return DOMSVGPointList::GetDOMWrapper(mPoints.GetBaseValKey(), this);
  25 }
  26
  27 already_AddRefed<DOMSVGPointList> SVGPolyElement::AnimatedPoints() {
  28   return DOMSVGPointList::GetDOMWrapper(mPoints.GetAnimValKey(), this);
  29 }
  30
  31 //----------------------------------------------------------------------
  32 // SVGElement methods
  33
  34 /* virtual */
  35 bool SVGPolyElement::HasValidDimensions() const {
  36   return !mPoints.GetAnimValue().IsEmpty();
  37 }
  38
  39 //----------------------------------------------------------------------
  40 // SVGGeometryElement methods
  41
  42 bool SVGPolyElement::AttributeDefinesGeometry(const nsAtom* aName) {
  43   return aName == nsGkAtoms::points;
  44 }
  45
  46 void SVGPolyElement::GetMarkPoints(nsTArray<SVGMark>* aMarks) {
  47   const SVGPointList& points = mPoints.GetAnimValue();
  48
  49   if (!points.Length()) return;
  50
  51   float px = points[0].mX, py = points[0].mY, prevAngle = 0.0;
  52
  53   aMarks->AppendElement(SVGMark(px, py, 0, SVGMark::eStart));
  54
  55   for (uint32_t i = 1; i < points.Length(); ++i) {
  56     float x = points[i].mX;
  57     float y = points[i].mY;
  58     float angle = std::atan2(y - py, x - px);
  59
  60     // Vertex marker.
  61     if (i == 1) {
  62       aMarks->ElementAt(0).angle = angle;
  63     } else {
  64       aMarks->LastElement().angle =
  65           SVGContentUtils::AngleBisect(prevAngle, angle);
  66     }
  67
  68     aMarks->AppendElement(SVGMark(x, y, 0, SVGMark::eMid));
  69
  70     prevAngle = angle;
  71     px = x;
  72     py = y;
  73   }
  74
  75   aMarks->LastElement().angle = prevAngle;
  76   aMarks->LastElement().type = SVGMark::eEnd;
  77 }
  78
  79 bool SVGPolyElement::GetGeometryBounds(Rect* aBounds,
  80                                        const StrokeOptions& aStrokeOptions,
  81                                        const Matrix& aToBoundsSpace,
  82                                        const Matrix* aToNonScalingStrokeSpace) {
  83   const SVGPointList& points = mPoints.GetAnimValue();
  84
  85   if (!points.Length()) {
  86     // Rendering of the element is disabled
  87     aBounds->SetEmpty();
  88     return true;
  89   }
  90
  91   if (aStrokeOptions.mLineWidth > 0 || aToNonScalingStrokeSpace) {
  92     // We don't handle non-scaling-stroke or stroke-miterlimit etc. yet
  93     return false;
  94   }
  95
  96   if (aToBoundsSpace.IsRectilinear()) {
  97     // We can avoid transforming each point and just transform the result.
  98     // Important for large point lists.
  99     Rect bounds(points[0], Size());
 100     for (uint32_t i = 1; i < points.Length(); ++i) {
 101       bounds.ExpandToEnclose(points[i]);
 102     }
 103     *aBounds = aToBoundsSpace.TransformBounds(bounds);
 104   } else {
 105     *aBounds = Rect(aToBoundsSpace.TransformPoint(points[0]), Size());
 106     for (uint32_t i = 1; i < points.Length(); ++i) {
 107       aBounds->ExpandToEnclose(aToBoundsSpace.TransformPoint(points[i]));
 108     }
 109   }
 110   return true;
 111 }
 112 }  // namespace mozilla::dom