C++ osg::Vec2类代码示例

void HUDView::updateRandomNumber(std::string number, osg::Vec2 normalizedPosition)
{
	if (number == "")
	{
		m_randomNumberText->setText("");
		m_backgroundGeode->setNodeMask(0); //invisible
		return;
	}
	

	float offset = m_width / 15;
	float halfextent = m_backgroundGeode->getBound().radius();
	float max_x = m_width - offset - halfextent;
	float max_y = m_height - offset;
	float p_x = clamp(halfextent, max_x, (normalizedPosition.x() * m_width));
	float p_y = clamp(halfextent + offset, max_y, (normalizedPosition.y() * m_height));


	osg::Vec2 position(p_x, p_y);

	m_backgroundGeode->setNodeMask(0xffffffff); //visible

	m_backgroundTransform->setMatrix(osg::Matrix::translate(osg::Vec3(position, 0)));
	m_randomNumberText->setPosition(osg::Vec3(position,0.0));
	m_randomNumberText->setText(number);


}

void Selector::operator ()(osg::Vec2 start, osg::Vec2 stop, bool select) {
	if (!this->m_viewer || !this->m_model) return;

	osg::ref_ptr<osgUtil::PolytopeIntersector> picker = new osgUtil::PolytopeIntersector(
			osgUtil::Intersector::CoordinateFrame::WINDOW, start.x(), start.y(), stop.x(), stop.y());
	picker->setDimensionMask(this->m_selection->mask());
	osgUtil::IntersectionVisitor visitor(picker);
	visitor.setTraversalMask(Role::Node::Pickable);
	this->m_viewer->getCamera()->accept(visitor);
	OcclusionTester tester(this->m_model);
	if (this->m_model->kdTree().valid()) {
		osg::Vec3 position(0.0f, 0.0f, 0.0f);
		this->m_viewer->getCamera()->getViewMatrixAsLookAt(position, osg::Vec3(), osg::Vec3());
		tester.setMask(this->m_selection->mask());
		tester.setPosition(algo::Util::toPoint(position));
	}
	if (picker->containsIntersections()) {
		const osgUtil::PolytopeIntersector::Intersections &intersections(picker->getIntersections());
		if (select) {
			for (osgUtil::PolytopeIntersector::Intersections::const_iterator iter = intersections.begin(); iter != intersections.end(); ++iter) {
				if (tester.occluded(iter->primitiveIndex)) continue;
				this->m_selection->indices().insert(iter->primitiveIndex);
			}
		} else {
			for (osgUtil::PolytopeIntersector::Intersections::const_iterator iter = intersections.begin(); iter != intersections.end(); ++iter) {
				if (tester.occluded(iter->primitiveIndex)) continue;
				this->m_selection->indices().remove(iter->primitiveIndex);
			}
		}
	}

	this->m_selection->update();
}

bool PointerInfo::projectWindowXYIntoObject(const osg::Vec2& windowCoord, osg::Vec3& nearPoint, osg::Vec3& farPoint) const
{
    nearPoint = osg::Vec3(windowCoord.x(),windowCoord.y(),0.0f)*_inverseMVPW;
    farPoint = osg::Vec3(windowCoord.x(),windowCoord.y(),1.0f)*_inverseMVPW;

    return true;
}

    void moveTo(const osg::Vec2& pos)
    {
        completeCurrentPrimitiveSet();

        addVertex( osg::Vec3(pos.x(),pos.y(),0) );

    }

osg::Vec2 calcCoordReprojTrans(const osg::Vec3 &vert,const osg::Matrix &trans,const osg::Matrix &viewProj,const osg::Vec2 &size,const osg::Vec4 &ratio){
    osg::Vec4 v(vert.x(),vert.y(),vert.z(),1.0);
    v=v*trans;
    v=v*viewProj;
    v.x() /= v.w();
    v.y() /= v.w();
    v.z() /= v.w();
    v.w() /= v.w();
    //std::cout << "Pre shift " << v << std::endl;
    v.x() /= size.x();;
    v.y() /= size.y();


    v.x() -= (ratio.x()/size.x());
    v.y() -= (ratio.y()/size.y());
    //std::cout << "Post shift " << v << std::endl;


    //  std::cout << "PP shift " << v << std::endl;


    osg::Vec2 tc(v.x(),v.y());
    tc.x() *= ratio.z();
    tc.y() *=ratio.w();
    //tc.x()*=ratio.x();
    //tc.y()*=ratio.y();
    tc.x()/=(ratio.z());
    tc.y()/=(ratio.w());


    return tc;

}

double MultitouchPlugin::angleBetween2DVectors(osg::Vec2 v1, osg::Vec2 v2)
{
    // http://codered.sat.qc.ca/redmine/projects/spinframework/repository/revisions/b6245189c19a7c6ba4fdb126940321c41c44e228/raw/src/spin/osgUtil.cpp

    // normalize vectors (note: this must be done alone, not within any vector arithmetic. why?!)
    v1.normalize();
    v2.normalize();

    // Get the dot product of the vectors
    double dotProduct = v1 * v2;

    // for acos, the value has to be between -1.0 and 1.0, but due to numerical imprecisions it sometimes comes outside this range
    if (dotProduct > 1.0)
        dotProduct = 1.0;
    if (dotProduct < -1.0)
        dotProduct = -1.0;

    // Get the angle in radians between the 2 vectors (should this be -acos ? ie, negative?)
    double angle = acos(dotProduct);

    // Here we make sure that the angle is not a -1.#IND0000000 number, which means indefinite
    if (isnan(angle)) //__isnand(x)
        return 0;

    // Return the angle in radians
    return (angle);
}

osg::Vec2 CityModel::pixelToWorld(osg::Vec2 pixel)
{
	osg::Vec2 levelSize = pairToVec2(getLevelSize());
	osg::Vec2 picSize = osg::Vec2(m_collisionImage.width(), m_collisionImage.height());
	double x = ((pixel.x() / picSize.x()) * levelSize.x()) - levelSize.x() / 2;
	double y = ((pixel.y() / picSize.y()) * levelSize.y()) - levelSize.y() / 2;
	return osg::Vec2(x, y);
}

bool Uniform::getElement( unsigned int index, osg::Vec2& v2 ) const
{
    if( index>=getNumElements() || !isCompatibleType(FLOAT_VEC2) ) return false;
    unsigned int j = index * getTypeNumComponents(getType());
    v2.x() = (*_floatArray)[j];
    v2.y() = (*_floatArray)[j+1];
    return true;
}

/**
 * \fn	void MenuButton::setPosition(osg::Vec2 pos)
 *
 * \brief	Sets a position of button.
 *
 * \param	pos	The position.
 */
void MenuButton::setPosition(osg::Vec2 pos)
{
	osg::Vec3Array* verts = new osg::Vec3Array(4);
	(*verts)[0] = osg::Vec3( pos.x() - 0.5, 0, pos.y() - 0.5);
	(*verts)[1] = osg::Vec3( pos.x() + 0.5, 0, pos.y() - 0.5);
	(*verts)[2] = osg::Vec3( pos.x() + 0.5, 0, pos.y() + 0.5);
	(*verts)[3] = osg::Vec3( pos.x() - 0.5, 0, pos.y() + 0.5);
	this->setVertexArray(verts);
}

bool ContourLayer::getValue(unsigned int i, unsigned int j, osg::Vec2& value) const
{
    if (!_tf) return false;

    const osg::Vec4& v = _tf->getPixelValue(i);
    value.x() = v.x();
    value.y() = v.y();

    return true;
}

bool TextRegion::Create(osg::Vec2 corner, osg::Vec2 size, RegionStyle* style )
{
    //set ref height for scaling in setsize
    _scaleHeightRef = size.y();
    
	//
    //
	bool ret = StrokeRegion::Create(corner,size,style);
    //set ref height for scaling in setsize
    _scaleHeightRef = size.y();
    this->SetSize(_size);
    return ret;
}

osg::Matrix vpb::MyDataSet::getImageSection(vips::VImage &in,const osg::Vec2 minT, const osg::Vec2 maxT,int origX,int origY,osg::Vec4 &texsize,const osg::Matrix &toTex,osg::ref_ptr<osg::Image> &image,osg::Vec4 &ratio,int level){

    double downsampleFactor=pow(2,level);
    double downsampleRatio=1.0/downsampleFactor;
    // std::cout<< minT << " " << maxT<<std::endl;
    // printf("%f %f\n",downsampleRatio,downsampleRatio);
    int x=(int)std::max((int)floor(minT.x()),0);
    int y=(int)std::max((int)floor(minT.y()),0);
    int xMax=(int)std::min((int)ceil(maxT.x()),origX);
    int yMax=(int)std::min((int)ceil(maxT.y()),origY);
    int xRange=(xMax-x);
    int yRange=(yMax-y);
    //printf("X:%d -- %d Y:%d -- %d ",x,xMax,y,yMax);

    //Need bias of 1.0 or will round down
    double maxSide=std::max(osg::Image::computeNearestPowerOfTwo(xRange,1.0),osg::Image::computeNearestPowerOfTwo(yRange,1.0));
    osg::Vec2 subSize=osg::Vec2(maxSide,maxSide);
    if(downsampleRatio*maxSide < 1.0){
        printf("Clipping %f %f to",downsampleRatio,downsampleFactor);
        downsampleRatio=1.0/maxSide;
        downsampleFactor=maxSide;
        printf("%f %f\n",downsampleRatio,downsampleFactor);

    }
    texsize[0]=origX;
    texsize[1]=origY;
    texsize[2]=subSize.x();
    texsize[3]=subSize.y();
    osg::Vec2 downsampleSize(subSize.x(),subSize.y());
    downsampleSize.x()*=downsampleRatio;
    downsampleSize.y()*=downsampleRatio;

    // printf("Range %d %d\n",xRange,yRange);
    // printf("%f %f %f %f\n",subSize.x(),subSize.y(),downsampleSize.x(),downsampleSize.y());
    image = new osg::Image;
    image->allocateImage(downsampleSize.x(),downsampleSize.y(), 1, GL_RGB,GL_UNSIGNED_BYTE);
    if(image->data() == 0 ){
        fprintf(stderr,"Failed to allocate\n");
        exit(-1);
    }
    {
        OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_imageMutex);
        vips::VImage osgImage(image->data(),downsampleSize.x(),downsampleSize.y(),3,vips::VImage::FMTUCHAR);
        in.extract_area(x,y,xRange,yRange).embed(1,0,0,subSize.x(),subSize.y()).shrink(downsampleFactor,downsampleFactor).write(osgImage);
    }
    ratio=osg::Vec4(x,y,subSize.x(),subSize.y());
    //osg::Vec2 f(xRange-subSize.x(),yRange-subSize.y());
    //std::cout << f<<std::endl;
    return toTex;
}

void dtAnim::MapCelestialToScreen(float azimuth,
                                  float elevation,
                                  float maxDistance,                             
                                  float windowWidth,
                                  float windowHeight,
                                  const osg::Vec2 &screenOrigin,
                                  osg::Vec2 &outScreenPos)
{
   // Transform az/el values to values ranging from 0 to 1
   float normalizedAzimuth   = azimuth / maxDistance;
   float normalizedElevation = elevation / maxDistance;

   // Calculate the final screen position
   outScreenPos[0] = screenOrigin.x() + (windowWidth * normalizedAzimuth);
   outScreenPos[1] = screenOrigin.y() + (windowHeight * normalizedElevation);   
}

//overload SetSize so we can set the texts pixelheight independantly
void TextRegion::SetSize(const osg::Vec2& size)
{
	StrokeRegion::SetSize(size);
    
	//set the texts max sizes to the new size
	_text->setMaximumHeight(size.y());
	_text->setMaximumWidth(size.x());
    
    float scaler = 1.0f / _scaleHeightRef;
    float sizeScale = size.y()*scaler;
    
    _textScale->setMatrix(osg::Matrix::scale(osg::Vec3(sizeScale,sizeScale,sizeScale)));
    
	//set new centered position
	this->SetAlignment(_alignmentMode);
}

    void conicTo(const osg::Vec2& control, const osg::Vec2& pos)
    {
        osg::Vec3 p0 = _previous;
        osg::Vec3 p1 = osg::Vec3(control.x(),control.y(),0);
        osg::Vec3 p2 = osg::Vec3(pos.x(),pos.y(),0);

        double dt = 1.0/_numSteps;
        double u=0;
        for (int i=0; i<=_numSteps; ++i)
        {
            double w = 1;
            double bs = 1.0/( (1-u)*(1-u)+2*(1-u)*u*w +u*u );
            osg::Vec3 p = (p0*((1-u)*(1-u)) + p1*(2*(1-u)*u*w) + p2*(u*u))*bs;
            addVertex( p );

            u += dt;
        }
    }