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C++ TwoDScene::setPosition方法代码示例

本文整理汇总了C++中TwoDScene::setPosition方法的典型用法代码示例。如果您正苦于以下问题:C++ TwoDScene::setPosition方法的具体用法?C++ TwoDScene::setPosition怎么用?C++ TwoDScene::setPosition使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在TwoDScene的用法示例。


在下文中一共展示了TwoDScene::setPosition方法的2个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的C++代码示例。

示例1: stepScene

bool ExplicitEuler::stepScene( TwoDScene& scene, scalar dt )
{
    VectorXs& x = scene.getX();
    VectorXs& v = scene.getV();
    const VectorXs& m = scene.getM();
    // if( scene.isFixed(i) )  // Determine if the ith particle is fixed

    int num_particles = scene.getNumParticles();
    VectorXs forces(num_particles * 2);
    VectorXs dx(num_particles * 2);
    VectorXs dv(num_particles * 2);
    for (int i = 0; i < num_particles * 2; i++){
      forces(i) = 0.0;
      dx(i) = 0.0;
      dv(i) = 0.0;
    }
    scene.accumulateGradU(forces, dx, dv);//, const VectorXs& dx, const VectorXs& dv )

    for (int i = 0; i < num_particles; i++){
      if (!scene.isFixed(i)){
        int index = 2 * i; // even indeces of vector are x params and odd are y params

        const Vector2s next_velocity(v(index) + dt*forces(index)/m(index),
                                     v(index+1) + dt*forces(index+1)/m(index));
        scene.setVelocity(i, next_velocity);
        
        const Vector2s next_position(x(index) + dt*v(index),
                                     x(index + 1) + dt*v(index+1));
        scene.setPosition(i, next_position);

        scalar kinetic_energy = 0;
        text_file << step_count*dt << "\t" << scene.computeKineticEnergy() << endl;
      }
    }

    step_count++;
    return true;
}
开发者ID:TurdOnTheRun,项目名称:animation,代码行数:38,代码来源:ExplicitEuler.cpp

示例2: loadParticles

void TwoDSceneXMLParser::loadParticles( rapidxml::xml_node<>* node, TwoDScene& twodscene )
{
  assert( node != NULL );
  
  // Count the number of particles
  int numparticles = 0;
  for( rapidxml::xml_node<>* nd = node->first_node("particle"); nd; nd = nd->next_sibling("particle") ) ++numparticles;
  
  twodscene.resizeSystem(numparticles);
  
  //std::cout << "Num particles " << numparticles << std::endl;
  
  std::vector<std::string>& tags = twodscene.getParticleTags();
  
  int particle = 0;
  for( rapidxml::xml_node<>* nd = node->first_node("particle"); nd; nd = nd->next_sibling("particle") )
  {
    // Extract the particle's initial position
    Vector3s pos;
    if( nd->first_attribute("px") ) 
    {
      std::string attribute(nd->first_attribute("px")->value());
      if( !stringutils::extractFromString(attribute,pos.x()) )
      {
        std::cerr << "\033[31;1mERROR IN XMLSCENEPARSER:\033[m Failed to parse value of px attribute for particle " << particle << ". Value must be numeric. Exiting." << std::endl;
        exit(1);
      }
    }
    else 
    {
      std::cerr << "\033[31;1mERROR IN XMLSCENEPARSER:\033[m Failed to parse px attribute for particle " << particle << ". Exiting." << std::endl;
      exit(1);
    }

    if( nd->first_attribute("py") ) 
    {
      std::string attribute(nd->first_attribute("py")->value());
      if( !stringutils::extractFromString(attribute,pos.y()) )
      {
        std::cerr << "\033[31;1mERROR IN XMLSCENEPARSER:\033[m Failed to parse value of py attribute for particle " << particle << ". Value must be numeric. Exiting." << std::endl;
        exit(1);
      }
    }
    else 
    {
      std::cerr << "\033[31;1mERROR IN XMLSCENEPARSER:\033[m Failed to parse py attribute for particle " << particle << ". Exiting." << std::endl;
      exit(1);
    }

    if( nd->first_attribute("pz") ) 
    {
      std::string attribute(nd->first_attribute("pz")->value());
      if( !stringutils::extractFromString(attribute,pos.z()) )
      {
        std::cerr << "\033[31;1mERROR IN XMLSCENEPARSER:\033[m Failed to parse value of pz attribute for particle " << particle << ". Value must be numeric. Exiting." << std::endl;
        exit(1);
      }
    }
    else 
    {
      std::cerr << "\033[31;1mERROR IN XMLSCENEPARSER:\033[m Failed to parse pz attribute for particle " << particle << ". Exiting." << std::endl;
      exit(1);
    }
    twodscene.setPosition( particle, pos );

    // Extract the particle's initial velocity
    Vector3s vel;
    if( nd->first_attribute("vx") ) 
    {
      std::string attribute(nd->first_attribute("vx")->value());
      if( !stringutils::extractFromString(attribute,vel.x()) )
      {
        std::cerr << "\033[31;1mERROR IN XMLSCENEPARSER:\033[m Failed to parse value of vx attribute for particle " << particle << ". Value must be numeric. Exiting." << std::endl;
        exit(1);
      }
    }
    else 
    {
      std::cerr << "\033[31;1mERROR IN XMLSCENEPARSER:\033[m Failed to parse vx attribute for particle " << particle << ". Exiting." << std::endl;
      exit(1);
    }
    
    if( nd->first_attribute("vy") ) 
    {
      std::string attribute(nd->first_attribute("vy")->value());
      if( !stringutils::extractFromString(attribute,vel.y()) )
      {
        std::cerr << "\033[31;1mERROR IN XMLSCENEPARSER:\033[m Failed to parse value of vy attribute for particle " << particle << ". Value must be numeric. Exiting." << std::endl;
        exit(1);
      }
    }
    else 
    {
      std::cerr << "\033[31;1mERROR IN XMLSCENEPARSER:\033[m Failed to parse vy attribute for particle " << particle << ". Exiting." << std::endl;
      exit(1);
    }

    if( nd->first_attribute("vz") ) 
    {
      std::string attribute(nd->first_attribute("vz")->value());
//.........这里部分代码省略.........
开发者ID:B-Rich,项目名称:sim3d,代码行数:101,代码来源:TwoDSceneXMLParser.cpp


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