// https://www.w3.org/TR/SVG/coords.html#ViewBoxAttribute
bool SkSVGAttributeParser::parseViewBox(SkSVGViewBoxType* vb) {
SkScalar x, y, w, h;
this->parseWSToken();
bool parsedValue = false;
if (this->parseScalarToken(&x) && this->parseSepToken() &&
this->parseScalarToken(&y) && this->parseSepToken() &&
this->parseScalarToken(&w) && this->parseSepToken() &&
this->parseScalarToken(&h)) {
*vb = SkSVGViewBoxType(SkRect::MakeXYWH(x, y, w, h));
parsedValue = true;
// consume trailing whitespace
this->parseWSToken();
}
return parsedValue && this->parseEOSToken();
}
void onOnceBeforeDraw() override {
const SkRect fieldBounds = kBounds.makeOutset(kBallSize / 2, kBallSize / 2);
const SkRRect ball = SkRRect::MakeOval(SkRect::MakeWH(kBallSize, kBallSize));
const SkRRect paddle = SkRRect::MakeRectXY(SkRect::MakeWH(kPaddleSize.width(),
kPaddleSize.height()),
kPaddleSize.width() / 2,
kPaddleSize.width() / 2);
fBall.initialize(ball,
SK_ColorGREEN,
SkPoint::Make(kBounds.centerX(), kBounds.centerY()),
SkVector::Make(fRand.nextRangeScalar(kBallSpeedMin, kBallSpeedMax),
fRand.nextRangeScalar(kBallSpeedMin, kBallSpeedMax)));
fPaddle0.initialize(paddle,
SK_ColorBLUE,
SkPoint::Make(fieldBounds.left() - kPaddleSize.width() / 2,
fieldBounds.centerY()),
SkVector::Make(0, 0));
fPaddle1.initialize(paddle,
SK_ColorRED,
SkPoint::Make(fieldBounds.right() + kPaddleSize.width() / 2,
fieldBounds.centerY()),
SkVector::Make(0, 0));
// Background decoration.
SkPath bgPath;
bgPath.moveTo(kBounds.left() , fieldBounds.top());
bgPath.lineTo(kBounds.right(), fieldBounds.top());
bgPath.moveTo(kBounds.left() , fieldBounds.bottom());
bgPath.lineTo(kBounds.right(), fieldBounds.bottom());
// TODO: stroke-dash support would come in handy right about now.
for (uint32_t i = 0; i < kBackgroundDashCount; ++i) {
bgPath.moveTo(kBounds.centerX(),
kBounds.top() + (i + 0.25f) * kBounds.height() / kBackgroundDashCount);
bgPath.lineTo(kBounds.centerX(),
kBounds.top() + (i + 0.75f) * kBounds.height() / kBackgroundDashCount);
}
sk_sp<SkSVGPath> bg = SkSVGPath::Make();
bg->setPath(bgPath);
bg->setFill(SkSVGPaint(SkSVGPaint::Type::kNone));
bg->setStroke(SkSVGPaint(SkSVGColorType(SK_ColorBLACK)));
bg->setStrokeWidth(SkSVGLength(kBackgroundStroke));
// Build the SVG DOM tree.
sk_sp<SkSVGSVG> root = SkSVGSVG::Make();
root->appendChild(std::move(bg));
root->appendChild(fPaddle0.shadowNode);
root->appendChild(fPaddle1.shadowNode);
root->appendChild(fBall.shadowNode);
root->appendChild(fPaddle0.objectNode);
root->appendChild(fPaddle1.objectNode);
root->appendChild(fBall.objectNode);
// Handle everything in a normalized 1x1 space.
root->setViewBox(SkSVGViewBoxType(SkRect::MakeWH(1, 1)));
fDom = sk_sp<SkSVGDOM>(new SkSVGDOM());
fDom->setContainerSize(SkSize::Make(this->width(), this->height()));
fDom->setRoot(std::move(root));
// Off we go.
this->updatePaddleStrategy();
}
