Function drawArc

snap_drawing/src/snap_drawing/cpp/Layers/SpinnerLayer.cpp:82–100

SpinnerLayer::~SpinnerLayer() = default;

static void drawArc(
    DrawingContext& drawingContext, const Rect& arcBounds, const Paint& paint, LazyPath& lazyPath, Scalar rotation) {
    auto drawWidth = drawingContext.drawBounds().width();
    auto drawHeight = drawingContext.drawBounds().height();

    auto saveCount = drawingContext.save();

    Matrix matrix;
    matrix.postRotate(rotation, drawWidth / 2.0f, drawHeight / 2.0f);
    drawingContext.concat(matrix);

    if (lazyPath.update(drawWidth, drawHeight)) {
        lazyPath.path().arcTo(arcBounds, 360.0f, 360.0f * kLineSweepRatio);
    }

    drawingContext.drawPaint(paint, lazyPath.path());

    drawingContext.restore(saveCount);
}

void SpinnerLayer::onDraw(DrawingContext& drawingContext) {
    Layer::onDraw(drawingContext);