Source code
Revision control
Copy as Markdown
Other Tools
/* -*- 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
#include "mozilla/dom/SVGLineElement.h"
#include "mozilla/dom/SVGLengthBinding.h"
#include "mozilla/dom/SVGLineElementBinding.h"
#include "mozilla/gfx/2D.h"
NS_IMPL_NS_NEW_SVG_ELEMENT(Line)
using namespace mozilla::gfx;
namespace mozilla::dom {
JSObject* SVGLineElement::WrapNode(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return SVGLineElement_Binding::Wrap(aCx, this, aGivenProto);
}
SVGElement::LengthInfo SVGLineElement::sLengthInfo[4] = {
{nsGkAtoms::x1, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER,
SVGContentUtils::X},
{nsGkAtoms::y1, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER,
SVGContentUtils::Y},
{nsGkAtoms::x2, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER,
SVGContentUtils::X},
{nsGkAtoms::y2, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER,
SVGContentUtils::Y},
};
//----------------------------------------------------------------------
// Implementation
SVGLineElement::SVGLineElement(
already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
: SVGLineElementBase(std::move(aNodeInfo)) {}
void SVGLineElement::MaybeAdjustForZeroLength(float aX1, float aY1, float& aX2,
float aY2) {
if (aX1 == aX2 && aY1 == aY2) {
SVGContentUtils::AutoStrokeOptions strokeOptions;
SVGContentUtils::GetStrokeOptions(&strokeOptions, this, nullptr, nullptr,
SVGContentUtils::eIgnoreStrokeDashing);
if (strokeOptions.mLineCap != CapStyle::BUTT) {
float tinyLength =
strokeOptions.mLineWidth / SVG_ZERO_LENGTH_PATH_FIX_FACTOR;
aX2 += tinyLength;
}
}
}
//----------------------------------------------------------------------
// nsINode methods
NS_IMPL_ELEMENT_CLONE_WITH_INIT(SVGLineElement)
//----------------------------------------------------------------------
already_AddRefed<DOMSVGAnimatedLength> SVGLineElement::X1() {
return mLengthAttributes[ATTR_X1].ToDOMAnimatedLength(this);
}
already_AddRefed<DOMSVGAnimatedLength> SVGLineElement::Y1() {
return mLengthAttributes[ATTR_Y1].ToDOMAnimatedLength(this);
}
already_AddRefed<DOMSVGAnimatedLength> SVGLineElement::X2() {
return mLengthAttributes[ATTR_X2].ToDOMAnimatedLength(this);
}
already_AddRefed<DOMSVGAnimatedLength> SVGLineElement::Y2() {
return mLengthAttributes[ATTR_Y2].ToDOMAnimatedLength(this);
}
//----------------------------------------------------------------------
// SVGElement methods
SVGElement::LengthAttributesInfo SVGLineElement::GetLengthInfo() {
return LengthAttributesInfo(mLengthAttributes, sLengthInfo,
ArrayLength(sLengthInfo));
}
//----------------------------------------------------------------------
// SVGGeometryElement methods
void SVGLineElement::GetMarkPoints(nsTArray<SVGMark>* aMarks) {
float x1, y1, x2, y2;
GetAnimatedLengthValues(&x1, &y1, &x2, &y2, nullptr);
float angle = std::atan2(y2 - y1, x2 - x1);
aMarks->AppendElement(SVGMark(x1, y1, angle, SVGMark::eStart));
aMarks->AppendElement(SVGMark(x2, y2, angle, SVGMark::eEnd));
}
void SVGLineElement::GetAsSimplePath(SimplePath* aSimplePath) {
float x1, y1, x2, y2;
GetAnimatedLengthValues(&x1, &y1, &x2, &y2, nullptr);
MaybeAdjustForZeroLength(x1, y1, x2, y2);
aSimplePath->SetLine(x1, y1, x2, y2);
}
already_AddRefed<Path> SVGLineElement::BuildPath(PathBuilder* aBuilder) {
float x1, y1, x2, y2;
GetAnimatedLengthValues(&x1, &y1, &x2, &y2, nullptr);
MaybeAdjustForZeroLength(x1, y1, x2, y2);
aBuilder->MoveTo(Point(x1, y1));
aBuilder->LineTo(Point(x2, y2));
return aBuilder->Finish();
}
bool SVGLineElement::GetGeometryBounds(Rect* aBounds,
const StrokeOptions& aStrokeOptions,
const Matrix& aToBoundsSpace,
const Matrix* aToNonScalingStrokeSpace) {
float x1, y1, x2, y2;
GetAnimatedLengthValues(&x1, &y1, &x2, &y2, nullptr);
if (aStrokeOptions.mLineWidth <= 0) {
*aBounds = Rect(aToBoundsSpace.TransformPoint(Point(x1, y1)), Size());
aBounds->ExpandToEnclose(aToBoundsSpace.TransformPoint(Point(x2, y2)));
return true;
}
// transform from non-scaling-stroke space to the space in which we compute
// bounds
Matrix nonScalingToBounds;
if (aToNonScalingStrokeSpace) {
MOZ_ASSERT(!aToNonScalingStrokeSpace->IsSingular());
Matrix nonScalingToUser = aToNonScalingStrokeSpace->Inverse();
nonScalingToBounds = nonScalingToUser * aToBoundsSpace;
}
if (aStrokeOptions.mLineCap == CapStyle::ROUND) {
if (!aToBoundsSpace.IsRectilinear() ||
(aToNonScalingStrokeSpace &&
!aToNonScalingStrokeSpace->IsRectilinear())) {
// TODO: handle this case.
return false;
}
Rect bounds(Point(x1, y1), Size());
bounds.ExpandToEnclose(Point(x2, y2));
if (aToNonScalingStrokeSpace) {
bounds = aToNonScalingStrokeSpace->TransformBounds(bounds);
bounds.Inflate(aStrokeOptions.mLineWidth / 2.f);
*aBounds = nonScalingToBounds.TransformBounds(bounds);
} else {
bounds.Inflate(aStrokeOptions.mLineWidth / 2.f);
*aBounds = aToBoundsSpace.TransformBounds(bounds);
}
return true;
}
// Handle butt and square linecap, normal and non-scaling stroke cases
// together: start with endpoints (x1, y1), (x2, y2) in the stroke space,
// compute the four corners of the stroked line, transform the corners to
// bounds space, and compute bounds there.
if (aToNonScalingStrokeSpace) {
Point nonScalingSpaceP1, nonScalingSpaceP2;
nonScalingSpaceP1 = aToNonScalingStrokeSpace->TransformPoint(Point(x1, y1));
nonScalingSpaceP2 = aToNonScalingStrokeSpace->TransformPoint(Point(x2, y2));
x1 = nonScalingSpaceP1.x;
y1 = nonScalingSpaceP1.y;
x2 = nonScalingSpaceP2.x;
y2 = nonScalingSpaceP2.y;
}
Float length = Float(NS_hypot(x2 - x1, y2 - y1));
Float xDelta;
Float yDelta;
Point points[4];
if (aStrokeOptions.mLineCap == CapStyle::BUTT) {
if (length == 0.f) {
xDelta = yDelta = 0.f;
} else {
Float ratio = aStrokeOptions.mLineWidth / 2.f / length;
xDelta = ratio * (y2 - y1);
yDelta = ratio * (x2 - x1);
}
points[0] = Point(x1 - xDelta, y1 + yDelta);
points[1] = Point(x1 + xDelta, y1 - yDelta);
points[2] = Point(x2 + xDelta, y2 - yDelta);
points[3] = Point(x2 - xDelta, y2 + yDelta);
} else {
MOZ_ASSERT(aStrokeOptions.mLineCap == CapStyle::SQUARE);
if (length == 0.f) {
xDelta = yDelta = aStrokeOptions.mLineWidth / 2.f;
points[0] = Point(x1 - xDelta, y1 + yDelta);
points[1] = Point(x1 - xDelta, y1 - yDelta);
points[2] = Point(x1 + xDelta, y1 - yDelta);
points[3] = Point(x1 + xDelta, y1 + yDelta);
} else {
Float ratio = aStrokeOptions.mLineWidth / 2.f / length;
yDelta = ratio * (x2 - x1);
xDelta = ratio * (y2 - y1);
points[0] = Point(x1 - yDelta - xDelta, y1 - xDelta + yDelta);
points[1] = Point(x1 - yDelta + xDelta, y1 - xDelta - yDelta);
points[2] = Point(x2 + yDelta + xDelta, y2 + xDelta - yDelta);
points[3] = Point(x2 + yDelta - xDelta, y2 + xDelta + yDelta);
}
}
const Matrix& toBoundsSpace =
aToNonScalingStrokeSpace ? nonScalingToBounds : aToBoundsSpace;
*aBounds = Rect(toBoundsSpace.TransformPoint(points[0]), Size());
for (uint32_t i = 1; i < 4; ++i) {
aBounds->ExpandToEnclose(toBoundsSpace.TransformPoint(points[i]));
}
return true;
}
} // namespace mozilla::dom