C++ SkPoint::y方法代码示例

    virtual void onDraw(SkCanvas* canvas) {
        const char* lcd_text = "LCD";
        const char* gray_text = "GRAY";

        SkPaint paint;
        paint.setAntiAlias(true);
        paint.setLCDRenderText(true);

        const struct {
            SkPoint     fLoc;
            SkScalar    fTextSize;
            SkScalar    fScale;
            const char* fText;
        } rec[] = {
            { {  10,  50 }, kLCDTextSizeLimit - 1,     1,  lcd_text },
            { { 160,  50 }, kLCDTextSizeLimit + 1,     1,  gray_text },
            { {  10, 100 }, kLCDTextSizeLimit / 2, 1.99f,  lcd_text },
            { { 160, 100 }, kLCDTextSizeLimit / 2, 2.01f,  gray_text },
        };

        for (size_t i = 0; i < SK_ARRAY_COUNT(rec); ++i) {
            const SkPoint loc = rec[i].fLoc;
            SkAutoCanvasRestore acr(canvas, true);

            paint.setTextSize(rec[i].fTextSize);
            ScaleAbout(canvas, rec[i].fScale, rec[i].fScale, loc.x(), loc.y());
            canvas->drawString(rec[i].fText, loc.x(), loc.y(), paint);
        }
    }

    void drawSceneColumn(SkCanvas* canvas, const SkPoint& pos, SkScalar scale, SkScalar localScale,
                         unsigned tileMode) {
        SkMatrix ctm, localMatrix;

        ctm.setTranslate(pos.x(), pos.y());
        ctm.preScale(scale, scale);
        localMatrix.setScale(localScale, localScale);
        this->drawScene(canvas, ctm, localMatrix, tileMode);

        ctm.setTranslate(pos.x(), pos.y() + fSceneSize * 1.2f * scale);
        ctm.preScale(scale, scale);
        localMatrix.setTranslate(fTileSize / 4, fTileSize / 4);
        localMatrix.preScale(localScale, localScale);
        this->drawScene(canvas, ctm, localMatrix, tileMode);

        ctm.setTranslate(pos.x(), pos.y() + fSceneSize * 2.4f * scale);
        ctm.preScale(scale, scale);
        localMatrix.setRotate(45);
        localMatrix.preScale(localScale, localScale);
        this->drawScene(canvas, ctm, localMatrix, tileMode);

        ctm.setTranslate(pos.x(), pos.y() + fSceneSize * 3.6f * scale);
        ctm.preScale(scale, scale);
        localMatrix.setSkew(1, 0);
        localMatrix.preScale(localScale, localScale);
        this->drawScene(canvas, ctm, localMatrix, tileMode);

        ctm.setTranslate(pos.x(), pos.y() + fSceneSize * 4.8f * scale);
        ctm.preScale(scale, scale);
        localMatrix.setTranslate(fTileSize / 4, fTileSize / 4);
        localMatrix.preRotate(45);
        localMatrix.preScale(localScale, localScale);
        this->drawScene(canvas, ctm, localMatrix, tileMode);
    }

    /**
     * Called on a background thread. Here we can only modify fBackPaths.
     */
    void runAnimationTask(double t, double dt, int w, int h) override {
        const float tsec = static_cast<float>(t);
        this->INHERITED::runAnimationTask(t, 0.5 * dt, w, h);

        for (int i = 0; i < kNumPaths; ++i) {
            const Glyph& glyph = fGlyphs[i];
            const SkMatrix& backMatrix = fBackMatrices[i];

            const Sk2f matrix[3] = {
                Sk2f(backMatrix.getScaleX(), backMatrix.getSkewY()),
                Sk2f(backMatrix.getSkewX(), backMatrix.getScaleY()),
                Sk2f(backMatrix.getTranslateX(), backMatrix.getTranslateY())
            };

            SkPath* backpath = &fBackPaths[i];
            backpath->reset();
            backpath->setFillType(SkPath::kEvenOdd_FillType);

            SkPath::RawIter iter(glyph.fPath);
            SkPath::Verb verb;
            SkPoint pts[4];

            while ((verb = iter.next(pts)) != SkPath::kDone_Verb) {
                switch (verb) {
                    case SkPath::kMove_Verb: {
                        SkPoint pt = fWaves.apply(tsec, matrix, pts[0]);
                        backpath->moveTo(pt.x(), pt.y());
                        break;
                    }
                    case SkPath::kLine_Verb: {
                        SkPoint endpt = fWaves.apply(tsec, matrix, pts[1]);
                        backpath->lineTo(endpt.x(), endpt.y());
                        break;
                    }
                    case SkPath::kQuad_Verb: {
                        SkPoint controlPt = fWaves.apply(tsec, matrix, pts[1]);
                        SkPoint endpt = fWaves.apply(tsec, matrix, pts[2]);
                        backpath->quadTo(controlPt.x(), controlPt.y(), endpt.x(), endpt.y());
                        break;
                    }
                    case SkPath::kClose_Verb: {
                        backpath->close();
                        break;
                    }
                    case SkPath::kCubic_Verb:
                    case SkPath::kConic_Verb:
                    case SkPath::kDone_Verb:
                        SK_ABORT("Unexpected path verb");
                        break;
                }
            }
        }
    }

    SkPath cubicPath(SkPoint p1, SkPoint p2) {
        SkASSERT(p1.y() == p2.y());

        SkPath path;
        path.moveTo(p1);

        SkPoint p3 = SkPoint::Make((p1.x() + p2.x()) / 3.0f, p1.y() * 0.7f);
        SkPoint p4 = SkPoint::Make(2.0f*(p1.x() + p2.x()) / 3.0f, p1.y() * 1.5f);

        path.cubicTo(p3, p4, p2);

        return path;
    }

    SkPath quadPath(SkPoint p1, SkPoint p2) {
        SkASSERT(p1.y() == p2.y());

        SkPath path;
        path.moveTo(p1);
        path.lineTo(p2);

        SkPoint p3 = SkPoint::Make((p1.x() + p2.x()) / 2.0f, p1.y() * 0.7f);

        path.quadTo(p3, p1);

        return path;
    }

        void updateDom() {
            const SkPoint corner = pos - SkPoint::Make(size.width() / 2, size.height() / 2);
            objectNode->setX(SkSVGLength(corner.x()));
            objectNode->setY(SkSVGLength(corner.y()));

            // Simulate parallax shadow for a centered light source.
            SkPoint shadowOffset = pos - SkPoint::Make(kBounds.centerX(), kBounds.centerY());
            shadowOffset.scale(kShadowParallax);
            const SkPoint shadowCorner = corner + shadowOffset;

            shadowNode->setX(SkSVGLength(shadowCorner.x()));
            shadowNode->setY(SkSVGLength(shadowCorner.y()));
        }

bool RRect::onContains(const SkPoint& p) const {
    if (!fRRect.rect().contains(p.x(), p.y())) {
        return false;
    }

    if (fRRect.isRect()) {
        return true;
    }

    // TODO: no SkRRect::contains(x, y)
    return fRRect.contains(SkRect::MakeLTRB(p.x() - SK_ScalarNearlyZero,
                                            p.y() - SK_ScalarNearlyZero,
                                            p.x() + SK_ScalarNearlyZero,
                                            p.y() + SK_ScalarNearlyZero));
}

PassRefPtr<JSONObject> LoggingCanvas::objectForSkPoint(const SkPoint& point)
{
    RefPtr<JSONObject> pointItem = JSONObject::create();
    pointItem->setNumber("x", point.x());
    pointItem->setNumber("y", point.y());
    return pointItem.release();
}

static void convolve_gaussian_2d(GrDrawContext* drawContext,
                                 const GrClip& clip,
                                 const SkRect& dstRect,
                                 const SkPoint& srcOffset,
                                 GrTexture* texture,
                                 int radiusX,
                                 int radiusY,
                                 SkScalar sigmaX,
                                 SkScalar sigmaY,
                                 const SkRect* srcBounds) {
    SkMatrix localMatrix = SkMatrix::MakeTrans(-srcOffset.x(), -srcOffset.y());
    SkISize size = SkISize::Make(2 * radiusX + 1,  2 * radiusY + 1);
    SkIPoint kernelOffset = SkIPoint::Make(radiusX, radiusY);
    GrPaint paint;
    SkIRect bounds;
    if (srcBounds) {
        srcBounds->roundOut(&bounds);
    } else {
        bounds.setEmpty();
    }

    SkAutoTUnref<GrFragmentProcessor> conv(GrMatrixConvolutionEffect::CreateGaussian(
            texture, bounds, size, 1.0, 0.0, kernelOffset,
            srcBounds ? GrTextureDomain::kDecal_Mode : GrTextureDomain::kIgnore_Mode,
            true, sigmaX, sigmaY));
    paint.addColorFragmentProcessor(conv);
    paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
    drawContext->fillRectWithLocalMatrix(clip, paint, SkMatrix::I(), dstRect, localMatrix);
}

void SkAnnotateNamedDestination(SkCanvas* canvas, const SkPoint& point, SkData* name) {
    if (nullptr == name) {
        return;
    }
    const SkRect rect = SkRect::MakeXYWH(point.x(), point.y(), 0, 0);
    canvas->drawAnnotation(rect, SkAnnotationKeys::Define_Named_Dest_Key(), name);
}

void SkAnnotateNamedDestination(SkCanvas* canvas, const SkPoint& point, SkData* name) {
    if (NULL == name) {
        return;
    }
    SkPaint paint;
    annotate_paint(paint, SkAnnotationKeys::Define_Named_Dest_Key(), name);
    canvas->drawPoint(point.x(), point.y(), paint);
}

inline void GrStencilAndCoverTextContext::appendGlyph(const SkGlyph& glyph, const SkPoint& pos) {
    // Stick the glyphs we can't draw into the fallback arrays.
    if (SkMask::kARGB32_Format == glyph.fMaskFormat) {
        fFallbackIndices.push_back(glyph.getGlyphID());
        fFallbackPositions.push_back().set(fTextInverseRatio * pos.x(),
                                           -fTextInverseRatio * pos.y());
    } else {
        // TODO: infer the reserve count from the text length.
        if (!fDraw) {
            fDraw = GrPathRangeDraw::Create(fGlyphs,
                                            GrPathRendering::kTranslate_PathTransformType,
                                            64);
        }
        float translate[] = { fTextInverseRatio * pos.x(), -fTextInverseRatio * pos.y() };
        fDraw->append(glyph.getGlyphID(), translate);
    }
}

SkScalar SkPerlinNoiseShader::PerlinNoiseShaderContext::noise2D(
        int channel, const StitchData& stitchData, const SkPoint& noiseVector) const {
    struct Noise {
        int noisePositionIntegerValue;
        int nextNoisePositionIntegerValue;
        SkScalar noisePositionFractionValue;
        Noise(SkScalar component)
        {
            SkScalar position = component + kPerlinNoise;
            noisePositionIntegerValue = SkScalarFloorToInt(position);
            noisePositionFractionValue = position - SkIntToScalar(noisePositionIntegerValue);
            nextNoisePositionIntegerValue = noisePositionIntegerValue + 1;
        }
    };
    Noise noiseX(noiseVector.x());
    Noise noiseY(noiseVector.y());
    SkScalar u, v;
    const SkPerlinNoiseShader& perlinNoiseShader = static_cast<const SkPerlinNoiseShader&>(fShader);
    // If stitching, adjust lattice points accordingly.
    if (perlinNoiseShader.fStitchTiles) {
        noiseX.noisePositionIntegerValue =
            checkNoise(noiseX.noisePositionIntegerValue, stitchData.fWrapX, stitchData.fWidth);
        noiseY.noisePositionIntegerValue =
            checkNoise(noiseY.noisePositionIntegerValue, stitchData.fWrapY, stitchData.fHeight);
        noiseX.nextNoisePositionIntegerValue =
            checkNoise(noiseX.nextNoisePositionIntegerValue, stitchData.fWrapX, stitchData.fWidth);
        noiseY.nextNoisePositionIntegerValue =
            checkNoise(noiseY.nextNoisePositionIntegerValue, stitchData.fWrapY, stitchData.fHeight);
    }
    noiseX.noisePositionIntegerValue &= kBlockMask;
    noiseY.noisePositionIntegerValue &= kBlockMask;
    noiseX.nextNoisePositionIntegerValue &= kBlockMask;
    noiseY.nextNoisePositionIntegerValue &= kBlockMask;
    int i =
        fPaintingData->fLatticeSelector[noiseX.noisePositionIntegerValue];
    int j =
        fPaintingData->fLatticeSelector[noiseX.nextNoisePositionIntegerValue];
    int b00 = (i + noiseY.noisePositionIntegerValue) & kBlockMask;
    int b10 = (j + noiseY.noisePositionIntegerValue) & kBlockMask;
    int b01 = (i + noiseY.nextNoisePositionIntegerValue) & kBlockMask;
    int b11 = (j + noiseY.nextNoisePositionIntegerValue) & kBlockMask;
    SkScalar sx = smoothCurve(noiseX.noisePositionFractionValue);
    SkScalar sy = smoothCurve(noiseY.noisePositionFractionValue);
    // This is taken 1:1 from SVG spec: http://www.w3.org/TR/SVG11/filters.html#feTurbulenceElement
    SkPoint fractionValue = SkPoint::Make(noiseX.noisePositionFractionValue,
                                          noiseY.noisePositionFractionValue); // Offset (0,0)
    u = fPaintingData->fGradient[channel][b00].dot(fractionValue);
    fractionValue.fX -= SK_Scalar1; // Offset (-1,0)
    v = fPaintingData->fGradient[channel][b10].dot(fractionValue);
    SkScalar a = SkScalarInterp(u, v, sx);
    fractionValue.fY -= SK_Scalar1; // Offset (-1,-1)
    v = fPaintingData->fGradient[channel][b11].dot(fractionValue);
    fractionValue.fX = noiseX.noisePositionFractionValue; // Offset (0,-1)
    u = fPaintingData->fGradient[channel][b01].dot(fractionValue);
    SkScalar b = SkScalarInterp(u, v, sx);
    return SkScalarInterp(a, b, sy);
}

 void onDrawPoints(PointMode mode, size_t count, const SkPoint pts[], const SkPaint& paint) override
 {
     if (!paint.getAnnotation())
         return;
     ASSERT_EQ(1u, count); // Only called from drawPoint().
     SkPoint point = getTotalMatrix().mapXY(pts[0].x(), pts[0].y());
     Operation operation = { DrawPoint, SkRect::MakeXYWH(point.x(), point.y(), 0, 0) };
     m_recordedOperations.append(operation);
 }

SkFlattenable* SkSweepGradient::CreateProc(SkReadBuffer& buffer) {
    DescriptorScope desc;
    if (!desc.unflatten(buffer)) {
        return NULL;
    }
    const SkPoint center = buffer.readPoint();
    return SkGradientShader::CreateSweep(center.x(), center.y(), desc.fColors, desc.fPos,
                                         desc.fCount, desc.fGradFlags, desc.fLocalMatrix);
}