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/dom/SVGAnimatedLength.h"
  10 #include "mozilla/gfx/2D.h"
  11 #include "SVGContentUtils.h"
  12
  13 using namespace mozilla::gfx;
  14
  15 namespace mozilla::dom {
  16
  17 //----------------------------------------------------------------------
  18 // Implementation
  19
  20 SVGPolyElement::SVGPolyElement(
  21     already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
  22     : SVGPolyElementBase(std::move(aNodeInfo)) {}
  23
  24 already_AddRefed<DOMSVGPointList> SVGPolyElement::Points() {
  25   return DOMSVGPointList::GetDOMWrapper(mPoints.GetBaseValKey(), this);
  26 }
  27
  28 already_AddRefed<DOMSVGPointList> SVGPolyElement::AnimatedPoints() {
  29   return DOMSVGPointList::GetDOMWrapper(mPoints.GetAnimValKey(), this);
  30 }
  31
  32 //----------------------------------------------------------------------
  33 // SVGElement methods
  34
  35 /* virtual */
  36 bool SVGPolyElement::HasValidDimensions() const {
  37   return !mPoints.GetAnimValue().IsEmpty();
  38 }
  39
  40 //----------------------------------------------------------------------
  41 // SVGGeometryElement methods
  42
  43 bool SVGPolyElement::AttributeDefinesGeometry(const nsAtom* aName) {
  44   return aName == nsGkAtoms::points;
  45 }
  46
  47 void SVGPolyElement::GetMarkPoints(nsTArray<SVGMark>* aMarks) {
  48   const SVGPointList& points = mPoints.GetAnimValue();
  49
  50   if (!points.Length()) return;
  51
  52   float zoom = UserSpaceMetrics::GetZoom(this);
  53
  54   float px = points[0].mX * zoom, py = points[0].mY * zoom, prevAngle = 0.0;
  55
  56   aMarks->AppendElement(SVGMark(px, py, 0, SVGMark::eStart));
  57
  58   for (uint32_t i = 1; i < points.Length(); ++i) {
  59     float x = points[i].mX * zoom;
  60     float y = points[i].mY * zoom;
  61     float angle = std::atan2(y - py, x - px);
  62
  63     // Vertex marker.
  64     if (i == 1) {
  65       aMarks->ElementAt(0).angle = angle;
  66     } else {
  67       aMarks->LastElement().angle =
  68           SVGContentUtils::AngleBisect(prevAngle, angle);
  69     }
  70
  71     aMarks->AppendElement(SVGMark(x, y, 0, SVGMark::eMid));
  72
  73     prevAngle = angle;
  74     px = x;
  75     py = y;
  76   }
  77
  78   aMarks->LastElement().angle = prevAngle;
  79   aMarks->LastElement().type = SVGMark::eEnd;
  80 }
  81
  82 bool SVGPolyElement::GetGeometryBounds(Rect* aBounds,
  83                                        const StrokeOptions& aStrokeOptions,
  84                                        const Matrix& aToBoundsSpace,
  85                                        const Matrix* aToNonScalingStrokeSpace) {
  86   const SVGPointList& points = mPoints.GetAnimValue();
  87
  88   if (!points.Length()) {
  89     // Rendering of the element is disabled
  90     aBounds->SetEmpty();
  91     return true;
  92   }
  93
  94   if (aStrokeOptions.mLineWidth > 0 || aToNonScalingStrokeSpace) {
  95     // We don't handle non-scaling-stroke or stroke-miterlimit etc. yet
  96     return false;
  97   }
  98
  99   float zoom = UserSpaceMetrics::GetZoom(this);
 100
 101   if (aToBoundsSpace.IsRectilinear()) {
 102     // We can avoid transforming each point and just transform the result.
 103     // Important for large point lists.
 104     Rect bounds(points[0] * zoom, Size());
 105     for (uint32_t i = 1; i < points.Length(); ++i) {
 106       bounds.ExpandToEnclose(points[i] * zoom);
 107     }
 108     *aBounds = aToBoundsSpace.TransformBounds(bounds);
 109   } else {
 110     *aBounds = Rect(aToBoundsSpace.TransformPoint(points[0] * zoom), Size());
 111     for (uint32_t i = 1; i < points.Length(); ++i) {
 112       aBounds->ExpandToEnclose(aToBoundsSpace.TransformPoint(points[i] * zoom));
 113     }
 114   }
 115   return true;
 116 }
 117 }  // namespace mozilla::dom