C++ SkPath::addOval方法代码示例

void PlatformGraphicsContextSkia::addInnerRoundedRectClip(const IntRect& rect,
                                                      int thickness)
{
    SkPath path;
    SkRect r(rect);

    path.addOval(r, SkPath::kCW_Direction);
    // Only perform the inset if we won't invert r
    if (2 * thickness < rect.width() && 2 * thickness < rect.height()) {
        // Adding one to the thickness doesn't make the border too thick as
        // it's painted over afterwards. But without this adjustment the
        // border appears a little anemic after anti-aliasing.
        r.inset(SkIntToScalar(thickness + 1), SkIntToScalar(thickness + 1));
        path.addOval(r, SkPath::kCCW_Direction);
    }
    mCanvas->clipPath(path, SkRegion::kIntersect_Op, true);
}

 SkRect draw(SkCanvas* canvas, const SkPaint& paint) override {
     SkPath path;
     path.addCircle(15, 15, 10);
     path.addOval(SkRect::MakeXYWH(2, 2, 22, 37));
     path.setFillType(SkPath::kEvenOdd_FillType);
     canvas->drawPath(path, paint);
     return path.getBounds();
 }

// ensure that we don't accidentally screw up the bounds when the oval is
// fractional, and the impl computes the center and radii, and uses them to
// reconstruct the edges of the circle.
// see bug# 1504910
static void test_circlebounds(SkCanvas* canvas) {
#ifdef SK_SCALAR_IS_FLOAT
    SkRect r = { 1.39999998f, 1, 21.3999996f, 21 };
    SkPath p;
    p.addOval(r);
    SkASSERT(r == p.getBounds());
#endif
}

    void drawRectSkeleton(SkCanvas* max, const SkRect& r) {
        SkPaint paint;
        this->setupSkeletonPaint(&paint);
        SkPath path;

        fRectAsOval ? path.addOval(r) : path.addRect(r);
        max->drawPath(path, paint);
    }

void GraphicsContext::addInnerRoundedRectClip(const IntRect& rect, int thickness)
{
    if (paintingDisabled())
        return;

    SkRect r(rect);
    if (!isRectSkiaSafe(getCTM(), r))
        return;

    SkPath path;
    path.addOval(r, SkPath::kCW_Direction);
    // only perform the inset if we won't invert r
    if (2 * thickness < rect.width() && 2 * thickness < rect.height()) {
        r.inset(SkIntToScalar(thickness) ,SkIntToScalar(thickness));
        path.addOval(r, SkPath::kCCW_Direction);
    }
    platformContext()->canvas()->clipPath(path);
}

void SkBitmapDevice::drawOval(const SkDraw& draw, const SkRect& oval, const SkPaint& paint) {
    CHECK_FOR_ANNOTATION(paint);

    SkPath path;
    path.addOval(oval);
    // call the VIRTUAL version, so any subclasses who do handle drawPath aren't
    // required to override drawOval.
    this->drawPath(draw, path, paint, NULL, true);
}

void GraphicsContext::addInnerRoundedRectClip(const IntRect& rect, int thickness)
{
    if (paintingDisabled())
        return;

    SkRect r(rect);
    SkPath path;
    path.addOval(r, SkPath::kCW_Direction);
    // only perform the inset if we won't invert r
    if (2 * thickness < rect.width() && 2 * thickness < rect.height()) {
        // Adding one to the thickness doesn't make the border too thick as
        // it's painted over afterwards. But without this adjustment the
        // border appears a little anemic after anti-aliasing.
        r.inset(SkIntToScalar(thickness + 1), SkIntToScalar(thickness + 1));
        path.addOval(r, SkPath::kCCW_Direction);
    }
    platformContext()->clipPathAntiAliased(path);
}

    TextOnPathView() {
        SkRect r;
        r.set(SkIntToScalar(100), SkIntToScalar(100),
              SkIntToScalar(300), SkIntToScalar(300));
        fPath.addOval(r);
        fPath.offset(SkIntToScalar(-50), SkIntToScalar(-50));

        fHOffset = SkIntToScalar(50);
    }

// we used to assert if the bounds of the device (clip) was larger than 32K
// even when the path itself was smaller. We just draw and hope in the debug
// version to not assert.
static void test_giantaa() {
    const int W = 400;
    const int H = 400;
    SkAutoTUnref<SkCanvas> canvas(SkCanvas::NewRasterN32(33000, 10));

    SkPaint paint;
    paint.setAntiAlias(true);
    SkPath path;
    path.addOval(SkRect::MakeXYWH(-10, -10, 20 + W, 20 + H));
    canvas.get()->drawPath(path, paint);
}

// we used to assert if the bounds of the device (clip) was larger than 32K
// even when the path itself was smaller. We just draw and hope in the debug
// version to not assert.
static void test_giantaa() {
    const int W = 400;
    const int H = 400;
    auto surface(SkSurface::MakeRasterN32Premul(33000, 10));

    SkPaint paint;
    paint.setAntiAlias(true);
    SkPath path;
    path.addOval(SkRect::MakeXYWH(-10, -10, 20 + W, 20 + H));
    surface->getCanvas()->drawPath(path, paint);
}

// we used to assert if the bounds of the device (clip) was larger than 32K
// even when the path itself was smaller. We just draw and hope in the debug
// version to not assert.
static void test_giantaa(skiatest::Reporter* reporter) {
    const int W = 400;
    const int H = 400;
    SkAutoTUnref<SkCanvas> canvas(new_canvas(33000, 10));
    canvas.get()->clear(SK_ColorTRANSPARENT);

    SkPaint paint;
    paint.setAntiAlias(true);
    SkPath path;
    path.addOval(SkRect::MakeXYWH(-10, -10, 20 + W, 20 + H));
    canvas.get()->drawPath(path, paint);
}

void GraphicsContext::clipOutEllipseInRect(const IntRect& rect)
{
    if (paintingDisabled())
        return;

    SkRect oval(rect);
    if (!isRectSkiaSafe(getCTM(), oval))
        return;

    SkPath path;
    path.addOval(oval, SkPath::kCCW_Direction);
    platformContext()->canvas()->clipPath(path, SkRegion::kDifference_Op);
}

    void onDraw(SkCanvas* canvas) override {
        SkRect r = { 10, 10, 100, 60 };

        SkPath path;

        path.addRect(r); test_rev(canvas, path);

        canvas->translate(0, 100);
        path.offset(20, 20);
        path.addRect(r); test_rev(canvas, path);

        canvas->translate(0, 100);
        path.reset();
        path.moveTo(10, 10); path.lineTo(30, 30);
        path.addOval(r);
        r.offset(50, 20);
        path.addOval(r);
        test_rev(canvas, path);

        path = hiragino_maru_goth_pro_e();
        canvas->translate(0, 100);
        test_rev(canvas, path);
    }

 virtual void onDraw(SkCanvas* canvas)
     {
     switch (fStyle)
         {
         case kRect_Style:
             canvas->drawRect(fRect, fPaint);
             break;
         case kOval_Style:
             canvas->drawOval(fRect, fPaint);
             break;
         case kRRect_Style:
             {
             SkScalar rx = fRect.width() / 5;
             SkScalar ry = fRect.height() / 5;
             if (rx < ry)
                 {
                 ry = rx;
                 }
             else
                 {
                 rx = ry;
                 }
             canvas->drawRoundRect(fRect, rx, ry, fPaint);
             break;
             }
         case kFrame_Style:
             {
             SkPath path;
             path.addOval(fRect, SkPath::kCW_Direction);
             SkRect r = fRect;
             r.inset(fRect.width()/6, 0);
             path.addOval(r, SkPath::kCCW_Direction);
             canvas->drawPath(path, fPaint);
             break;
             }
         }
     }

void Path::addArc(const FloatPoint& p, float r, float sa, float ea,
                  bool clockwise) {
    SkScalar    cx = SkFloatToScalar(p.x());
    SkScalar    cy = SkFloatToScalar(p.y());
    SkScalar    radius = SkFloatToScalar(r);

    SkRect  oval;
    oval.set(cx - radius, cy - radius, cx + radius, cy + radius);
    
    float sweep = ea - sa;
    bool prependOval = false;

    /*  Note if clockwise and the sign of the sweep disagree. This particular
        logic was deduced from http://canvex.lazyilluminati.com/misc/arc.html
    */
    if (clockwise && (sweep > 0 || sweep < -g2PI)) {
        sweep = fmodf(sweep, g2PI) - g2PI;
    } else if (!clockwise && (sweep < 0 || sweep > g2PI)) {
        sweep = fmodf(sweep, g2PI) + g2PI;
    }
    
    // If the abs(sweep) >= 2PI, then we need to add a circle before we call
    // arcTo, since it treats the sweep mod 2PI. We don't have a prepend call,
    // so we just remember this, and at the end create a new path with an oval
    // and our current path, and then swap then.
    //
    if (sweep >= g2PI || sweep <= -g2PI) {
        prependOval = true;
//        SkDebugf("addArc sa=%g ea=%g cw=%d sweep %g treat as circle\n", sa, ea, clockwise, sweep);

        // now reduce sweep to just the amount we need, so that the current
        // point is left where the caller expects it.
        sweep = fmodf(sweep, g2PI);
    }

    sa = fast_mod(sa, g2PI);
    SkScalar startDegrees = SkFloatToScalar(sa * g180OverPI);
    SkScalar sweepDegrees = SkFloatToScalar(sweep * g180OverPI);

//    SkDebugf("addArc sa=%g ea=%g cw=%d sweep=%g ssweep=%g\n", sa, ea, clockwise, sweep, SkScalarToFloat(sweepDegrees));
    m_path->arcTo(oval, startDegrees, sweepDegrees, false);
    
    if (prependOval) {
        SkPath tmp;
        tmp.addOval(oval);
        tmp.addPath(*m_path);
        m_path->swap(tmp);
    }
}