C++ Pair::first方法代码示例

void frameFieldBackgroundMesh2D::eval_crossfield(double u, double v, STensor3 &cf)
{
    double quadAngle  = angle(u,v);
    Pair<SVector3, SVector3> dirs = compute_crossfield_directions(u,v,quadAngle);
    SVector3 n = crossprod(dirs.first(),dirs.second());

    for (int i=0; i<3; i++) {
        cf(i,0) = dirs.first()[i];
        cf(i,1) = dirs.second()[i];
        cf(i,2) = n[i];
    }

    //  SVector3 t1,t2,n;
    //  GFace *face = dynamic_cast<GFace*>(gf);
    //  Pair<SVector3, SVector3> der = face->firstDer(SPoint2(u,v));
    //  SVector3 s1 = der.first();
    //  SVector3 s2 = der.second();
    //  n = crossprod(s1,s2);
    //  n.normalize();
    //  s1.normalize();
    //  s2=crossprod(n,s1);
    //  t1 = s1 * cos(quadAngle) + s2 * sin(quadAngle) ;
    //  t1.normalize();
    //  t2 = crossprod(n,t1);
    //  for (int i=0;i<3;i++){
    //    cf(i,0) = t1[i];
    //    cf(i,1) = t2[i];
    //    cf(i,2) = n[i];
    //  }
}

static String serializePositionOffset(const Pair& offset, const Pair& other)
{
    if ((offset.first()->getValueID() == CSSValueLeft && other.first()->getValueID() == CSSValueTop)
        || (offset.first()->getValueID() == CSSValueTop && other.first()->getValueID() == CSSValueLeft))
        return offset.second()->cssText();
    return offset.cssText();
}

    virtual void applyValue(CSSStyleSelector* selector, CSSValue* value) const
    {
        if (!value->isPrimitiveValue())
            return;

        CSSPrimitiveValue* primitiveValue = static_cast<CSSPrimitiveValue*>(value);
        Pair* pair = primitiveValue->getPairValue();
        if (!pair || !pair->first() || !pair->second())
            return;

        Length radiusWidth;
        Length radiusHeight;
        if (pair->first()->primitiveType() == CSSPrimitiveValue::CSS_PERCENTAGE)
            radiusWidth = Length(pair->first()->getDoubleValue(), Percent);
        else
            radiusWidth = Length(max(intMinForLength, min(intMaxForLength, pair->first()->computeLength<int>(selector->style(), selector->rootElementStyle(), selector->style()->effectiveZoom()))), Fixed);
        if (pair->second()->primitiveType() == CSSPrimitiveValue::CSS_PERCENTAGE)
            radiusHeight = Length(pair->second()->getDoubleValue(), Percent);
        else
            radiusHeight = Length(max(intMinForLength, min(intMaxForLength, pair->second()->computeLength<int>(selector->style(), selector->rootElementStyle(), selector->style()->effectiveZoom()))), Fixed);
        int width = radiusWidth.value();
        int height = radiusHeight.value();
        if (width < 0 || height < 0)
            return;
        if (!width)
            radiusHeight = radiusWidth; // Null out the other value.
        else if (!height)
            radiusWidth = radiusHeight; // Null out the other value.

        LengthSize size(radiusWidth, radiusHeight);
        setValue(selector->style(), size);
    }

static inline void updateCornerRadiusWidthAndHeight(CSSPrimitiveValue* corner, String& width, String& height)
{
    if (!corner)
        return;

    Pair* radius = corner->getPairValue();
    width = radius->first() ? radius->first()->cssText() : String("0");
    if (radius->second())
        height = radius->second()->cssText();
}

void CSSToStyleMap::mapFillYPosition(CSSPropertyID propertyID, FillLayer* layer, CSSValue* value)
{
    if (value->isInitialValue()) {
        layer->setYPosition(FillLayer::initialFillYPosition(layer->type()));
        return;
    }

    if (!is<CSSPrimitiveValue>(*value))
        return;

    CSSPrimitiveValue* primitiveValue = downcast<CSSPrimitiveValue>(value);
    Pair* pair = primitiveValue->getPairValue();
    if (pair) {
        ASSERT_UNUSED(propertyID, propertyID == CSSPropertyBackgroundPositionY || propertyID == CSSPropertyWebkitMaskPositionY);
        primitiveValue = pair->second();
    }

    Length length;
    if (primitiveValue->isLength())
        length = primitiveValue->computeLength<Length>(m_resolver->state().cssToLengthConversionData());
    else if (primitiveValue->isPercentage())
        length = Length(primitiveValue->getDoubleValue(), Percent);
    else if (primitiveValue->isCalculatedPercentageWithLength())
        length = Length(primitiveValue->cssCalcValue()->createCalculationValue(m_resolver->state().cssToLengthConversionData()));
    else
        return;

    layer->setYPosition(length);
    if (pair)
        layer->setBackgroundYOrigin(*(pair->first()));
}

// returns the cross field as a pair of othogonal vectors (NOT in parametric coordinates, but real 3D coordinates)
Pair<SVector3, SVector3> frameFieldBackgroundMesh2D::compute_crossfield_directions(double u, double v,
        double angle_current)
{
    // get the unit normal at that point
    GFace *face = dynamic_cast<GFace*>(gf);
    if(!face) {
        Msg::Error("Entity is not a face in background mesh");
        return Pair<SVector3,SVector3>(SVector3(), SVector3());
    }

    Pair<SVector3, SVector3> der = face->firstDer(SPoint2(u,v));
    SVector3 s1 = der.first();
    SVector3 s2 = der.second();
    SVector3 n = crossprod(s1,s2);
    n.normalize();

    SVector3 basis_u = s1;
    basis_u.normalize();
    SVector3 basis_v = crossprod(n,basis_u);

    // normalize vector t1 that is tangent to gf at uv
    SVector3 t1 = basis_u * cos(angle_current) + basis_v * sin(angle_current) ;
    t1.normalize();

    // compute the second direction t2 and normalize (t1,t2,n) is the tangent frame
    SVector3 t2 = crossprod(n,t1);
    t2.normalize();

    return Pair<SVector3,SVector3>(SVector3(t1[0],t1[1],t1[2]),
                                   SVector3(t2[0],t2[1],t2[2]));
}

void frameFieldBackgroundMesh2D::exportCrossField(const std::string &filename)
{
    FILE *f = Fopen(filename.c_str(), "w");
    if(!f) {
        Msg::Error("Could not open file '%s'", filename.c_str());
        return;
    }
    fprintf(f,"View \"Cross Field\"{\n");
    std::vector<double> deltas(2);
    deltas[0] = 0.;
    deltas[1] = M_PI;

    for (std::vector<MVertex*>::iterator it = beginvertices(); it!=endvertices(); it++) {
        MVertex *v = *it;
        double angle_current = angle(v);
        GPoint p = get_GPoint_from_MVertex(v);
        for (int i=0; i<2; i++) {
            Pair<SVector3, SVector3> dirs = compute_crossfield_directions(v->x(),v->y(),angle_current+deltas[i]);
            fprintf(f,"VP(%g,%g,%g) {%g,%g,%g};\n",p.x(),p.y(),p.z(),dirs.first()[0], dirs.first()[1], dirs.first()[2]);
            fprintf(f,"VP(%g,%g,%g) {%g,%g,%g};\n",p.x(),p.y(),p.z(),dirs.second()[0], dirs.second()[1], dirs.second()[2]);
        }
    }
    fprintf(f,"};\n");
    fclose(f);
}

void CSSToStyleMap::mapFillYPosition(CSSPropertyID propertyID, FillLayer* layer, CSSValue* value)
{
    if (value->isInitialValue()) {
        layer->setYPosition(FillLayer::initialFillYPosition(layer->type()));
        return;
    }

    if (!value->isPrimitiveValue())
        return;

    float zoomFactor = style()->effectiveZoom();

    CSSPrimitiveValue* primitiveValue = static_cast<CSSPrimitiveValue*>(value);
    Pair* pair = primitiveValue->getPairValue();
    if (pair) {
        ASSERT_UNUSED(propertyID, propertyID == CSSPropertyBackgroundPositionY || propertyID == CSSPropertyWebkitMaskPositionY);
        primitiveValue = pair->second();
    }

    Length length;
    if (primitiveValue->isLength())
        length = primitiveValue->computeLength<Length>(style(), rootElementStyle(), zoomFactor);
    else if (primitiveValue->isPercentage())
        length = Length(primitiveValue->getDoubleValue(), Percent);
    else if (primitiveValue->isCalculatedPercentageWithLength())
        length = Length(primitiveValue->cssCalcValue()->toCalcValue(style(), rootElementStyle(), zoomFactor));
    else if (primitiveValue->isViewportPercentageLength())
        length = primitiveValue->viewportPercentageLength();
    else
        return;

    layer->setYPosition(length);
    if (pair)
        layer->setBackgroundYOrigin(*(pair->first()));
}

void CSSToStyleMap::mapNinePieceImageRepeat(StyleResolverState&, CSSValue* value, NinePieceImage& image)
{
    if (!value || !value->isPrimitiveValue())
        return;

    CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
    Pair* pair = primitiveValue->getPairValue();
    if (!pair || !pair->first() || !pair->second())
        return;

    CSSValueID firstIdentifier = pair->first()->getValueID();
    CSSValueID secondIdentifier = pair->second()->getValueID();

    ENinePieceImageRule horizontalRule;
    switch (firstIdentifier) {
    case CSSValueStretch:
        horizontalRule = StretchImageRule;
        break;
    case CSSValueRound:
        horizontalRule = RoundImageRule;
        break;
    case CSSValueSpace:
        horizontalRule = SpaceImageRule;
        break;
    default: // CSSValueRepeat
        horizontalRule = RepeatImageRule;
        break;
    }
    image.setHorizontalRule(horizontalRule);

    ENinePieceImageRule verticalRule;
    switch (secondIdentifier) {
    case CSSValueStretch:
        verticalRule = StretchImageRule;
        break;
    case CSSValueRound:
        verticalRule = RoundImageRule;
        break;
    case CSSValueSpace:
        verticalRule = SpaceImageRule;
        break;
    default: // CSSValueRepeat
        verticalRule = RepeatImageRule;
        break;
    }
    image.setVerticalRule(verticalRule);
}

const Pair<A,B>& Pair<A,B>::operator=(const Pair<A,B>& iP)
{
	if (this!=&iP) {
		_first=iP.first();	  
		_second = iP.second();
	}
	return *this;
}

LengthPoint StyleBuilderConverter::convertLengthPoint(StyleResolverState& state, CSSValue* value)
{
    CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
    Pair* pair = primitiveValue->getPairValue();
    Length x = pair->first()->convertToLength<FixedConversion | PercentConversion>(state.cssToLengthConversionData());
    Length y = pair->second()->convertToLength<FixedConversion | PercentConversion>(state.cssToLengthConversionData());
    return LengthPoint(x, y);
}

static LengthSize convertToLengthSize(const StyleResolverState& state, CSSPrimitiveValue* value)
{
    if (!value)
        return LengthSize(Length(0, Fixed), Length(0, Fixed));

    Pair* pair = value->getPairValue();
    return LengthSize(convertToLength(state, pair->first()), convertToLength(state, pair->second()));
}

void highOrderTools::computeMetricInfo(GFace *gf,
                                       MElement *e,
                                       fullMatrix<double> &J,
                                       fullMatrix<double> &JT,
                                       fullVector<double> &D)
{
  int nbNodes = e->getNumVertices();
  //  printf("ELEMENT --\n");
  for (int j = 0; j < nbNodes; j++){
    SPoint2 param;
    reparamMeshVertexOnFace(e->getVertex(j), gf, param);
    //    printf("%g %g vs %g %g %g\n",param.x(),param.y(),
    //	   e->getVertex(j)->x(),e->getVertex(j)->y(),e->getVertex(j)->z());

    Pair<SVector3,SVector3> der = gf->firstDer(param);

    int XJ = j;
    int YJ = j + nbNodes;
    int ZJ = j + 2 * nbNodes;
    int UJ = j;
    int VJ = j + nbNodes;
    J(XJ,UJ) = der.first().x();
    J(YJ,UJ) = der.first().y();
    J(ZJ,UJ) = der.first().z();
    J(XJ,VJ) = der.second().x();
    J(YJ,VJ) = der.second().y();
    J(ZJ,VJ) = der.second().z();

    JT(UJ,XJ) = der.first().x();
    JT(UJ,YJ) = der.first().y();
    JT(UJ,ZJ) = der.first().z();
    JT(VJ,XJ) = der.second().x();
    JT(VJ,YJ) = der.second().y();
    JT(VJ,ZJ) = der.second().z();

    SVector3 ss = getSSL(e->getVertex(j));
    GPoint gp = gf->point(param);
    D(XJ) = (gp.x() - ss.x());
    D(YJ) = (gp.y() - ss.y());
    D(ZJ) = (gp.z() - ss.z());
  }
}

LengthSize StyleBuilderConverter::convertRadius(StyleResolverState& state, CSSValue* value)
{
    CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
    Pair* pair = primitiveValue->getPairValue();
    Length radiusWidth = pair->first()->convertToLength<FixedConversion | PercentConversion>(state.cssToLengthConversionData());
    Length radiusHeight = pair->second()->convertToLength<FixedConversion | PercentConversion>(state.cssToLengthConversionData());
    float width = radiusWidth.value();
    float height = radiusHeight.value();
    ASSERT(width >= 0 && height >= 0);
    if (width <= 0 || height <= 0)
        return LengthSize(Length(0, Fixed), Length(0, Fixed));
    return LengthSize(radiusWidth, radiusHeight);
}

// Return the number of divisions in each direction for the face
Pair<label> faceNij(const label facei, const block& block)
{
    Pair<label> fnij;

    int i = facei/2;

    if (i == 0)
    {
        fnij.first() = block.meshDensity().y() + 1;
        fnij.second() = block.meshDensity().z() + 1;
    }
    else if (i == 1)
    {
        fnij.first() = block.meshDensity().x() + 1;
        fnij.second() = block.meshDensity().z() + 1;
    }
    else if (i == 2)
    {
        fnij.first() = block.meshDensity().x() + 1;
        fnij.second() = block.meshDensity().y() + 1;
    }

    return fnij;
}