#include "CKAll.h"

#include <time.h>

#include "ObjectEmitter.h"


void
ObjectEmitter::InitiateParticle(Particle* p)
{
	CK3dEntity* entity = (CK3dEntity*)m_Context->GetObject(m_Entity);

	// we get a random face
	int nbface = m_Shape->GetFaceCount();
	int face=rand()%nbface;
	
	VxVector av,bv,cv,fn;
	fn = m_Shape->GetFaceNormal(face);
	av = m_Shape->GetFaceVertex(face,0);
	bv = m_Shape->GetFaceVertex(face,1);
	cv = m_Shape->GetFaceVertex(face,2);
	float af,bf,cf;
	af=(float)fabs(RANDNUM);
	bf=(float)fabs(RANDNUM);
	cf=(float)fabs(RANDNUM);
	av*=af;
	bv*=bf;
	cv*=cf;
	
	VxVector entpos = av+bv+cv;
	entpos/=(af+bf+cf);
	entity->Transform(&(p->pos),&entpos);
	
	// CALCULATE THE STARTING DIRECTION VECTOR
	VxVector endPoint = entpos + fn;
	VxVector newStart,newEnd,newDir;
	entity->Transform(&newStart,&entpos);
	entity->Transform(&newEnd,&endPoint);
	newDir = newEnd - newStart;
	VxMatrix mat;
	Vx3DMatrixFromEulerAngles(mat,m_YawVariation * RANDNUM,m_PitchVariation * RANDNUM,0.0);
	Vx3DRotateVector(&(p->dir),mat,&newDir);
}

void
ObjectEmitter::InitiateDirection(Particle* p)
{
	// Do nothing because already done in the InitiateParticle
	// TODO : may be change this
	// with TransformVector....
}