SquareEmitter.cpp

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#include "SquareEmitter.h"
#include <time.h>
 
#include <stdlib.h>
 
namespace dyno
{
    IMPLEMENT_CLASS(SquareEmitter)
 
    SquareEmitter::SquareEmitter()
        : ParticleEmitter()
    {
        srand(time(0));
 
        this->varWidth()->setRange(0.01, 10.0f);
        this->varHeight()->setRange(0.01, 10.0f);
 
        this->stateOutline()->setDataPtr(std::make_shared<EdgeSet>());
 
        auto callback = std::make_shared<FCallBackFunc>(std::bind(&SquareEmitter::tranformChanged, this));
 
        this->varLocation()->attach(callback);
        this->varScale()->attach(callback);
        this->varRotation()->attach(callback);
 
        this->varWidth()->attach(callback);
        this->varHeight()->attach(callback);
    }
 
    SquareEmitter::~SquareEmitter()
    {
    }
 
    void SquareEmitter::generateParticles()
    {
        auto sampling_distance = this->varSamplingDistance()->getData();
 
        if (sampling_distance < EPSILON)
            sampling_distance = 0.005f;
 
        auto center = this->varLocation()->getData();
        auto scale = this->varScale()->getData();
 
        auto quat = this->computeQuaternion();
 
        Transform<float, 3> tr(center, quat.toMatrix3x3(), scale);
 
        std::vector<Vec3f> pos_list;
        std::vector<Vec3f> vel_list;
 
        Vec3f v0 = this->varVelocityMagnitude()->getData()*quat.rotate(Vec3f(0, -1, 0));
 
        auto w = 0.5 * this->varWidth()->getData();
        auto h = 0.5 * this->varHeight()->getData();
 
        for (float x = -w; x <= w; x += sampling_distance)
        {
            for (float z = -h; z <= h; z += sampling_distance)
            {
                Vec3f p = Vec3f(x, 0, z);
                if (rand() % 5 == 0)
                {
                    pos_list.push_back(tr * p);
                    vel_list.push_back(v0);
                }
            }
        }
 
        if (pos_list.size() > 0)
        {
            this->mPosition.resize(pos_list.size());
            this->mVelocity.resize(pos_list.size());
 
            this->mPosition.assign(pos_list);
            this->mVelocity.assign(vel_list);
        }
 
 
        pos_list.clear();
        vel_list.clear();
    }
    
    void SquareEmitter::tranformChanged()
    {
        std::vector<Vec3f> vertices;
        std::vector<TopologyModule::Edge> edges;
 
        auto center = this->varLocation()->getData();
        auto scale = this->varScale()->getData();
 
        auto quat = this->computeQuaternion();
 
        auto w = this->varWidth()->getData();
        auto h = this->varHeight()->getData();
 
        Transform<float, 3> tr(Coord(0), quat.toMatrix3x3(), scale);
 
        auto Nx = tr * Vec3f(0.5 * w, 0, 0);
        auto Nz = tr * Vec3f(0, 0, 0.5 * h);
 
        vertices.push_back(center + Nx + Nz);
        vertices.push_back(center + Nx - Nz);
        vertices.push_back(center - Nx - Nz);
        vertices.push_back(center - Nx + Nz);
 
        edges.push_back(TopologyModule::Edge(0, 1));
        edges.push_back(TopologyModule::Edge(1, 2));
        edges.push_back(TopologyModule::Edge(2, 3));
        edges.push_back(TopologyModule::Edge(3, 0));
 
        auto edgeTopo = this->stateOutline()->getDataPtr();
 
        edgeTopo->setPoints(vertices);
        edgeTopo->setEdges(edges);
 
        vertices.clear();
        edges.clear();
    }
 
    void SquareEmitter::resetStates()
    {
        tranformChanged();
    }
}