//----------------------------------------------------------------//
float ZLBox::GetRadius () const {
ZLVec3D spans = mMax;
spans.Sub ( mMin );
spans.Scale ( 0.5f );
return spans.Length ();
}
//----------------------------------------------------------------//
void ZLPrism::GetCenter ( ZLVec3D& center ) const {
center = this->mXAxis;
center.Add ( this->mYAxis );
center.Add ( this->mZAxis );
center.Scale ( 0.5f );
center.Add ( this->mLoc );
}
//----------------------------------------------------------------//
void ZLQuaternion::Multiply ( const ZLQuaternion& rhs ) {
ZLVec3D cross;
cross.Cross ( mV, rhs.mV );
ZLVec3D resultVec;
resultVec.Init ( rhs.mV );
resultVec.Scale ( mS );
ZLVec3D scaledVec;
scaledVec.Init ( mV );
scaledVec.Scale ( rhs.mS );
resultVec.Add ( scaledVec );
resultVec.Sub ( cross );
mS = mS * rhs.mS - mV.Dot ( rhs.mV );
mV.Init ( resultVec );
}
//----------------------------------------------------------------//
ZLVec3D MOAIAnimCurveVec::GetValue ( const MOAIAnimKeySpan& span ) const {
MOAIAnimKey& key = this->mKeys [ span.mKeyID ];
ZLVec3D v0 = this->mSamples [ span.mKeyID ];
if ( span.mTime > 0.0f ) {
ZLVec3D v1 = this->mSamples [ span.mKeyID + 1 ];
v0.mX = ZLInterpolate::Interpolate ( key.mMode, v0.mX, v1.mX, span.mTime, key.mWeight );
v0.mY = ZLInterpolate::Interpolate ( key.mMode, v0.mY, v1.mY, span.mTime, key.mWeight );
v0.mZ = ZLInterpolate::Interpolate ( key.mMode, v0.mZ, v1.mZ, span.mTime, key.mWeight );
}
if ( span.mCycle != 0.0f ) {
ZLVec3D curveDelta = this->GetCurveDelta ();
curveDelta.Scale ( span.mCycle );
v0.Add ( curveDelta );
}
return v0;
}
//----------------------------------------------------------------//
void MOAIParticleForce::Eval ( const ZLVec3D& loc, float mass, ZLVec3D& acceleration, ZLVec3D& offset ) {
ZLVec3D force ( 0.0f, 0.0f, 0.0f );
ZLVec3D origin = this->mLocalToWorldMtx.GetTranslation ();
switch ( this->mShape ) {
case ATTRACTOR: {
ZLVec3D vec = origin;
vec.Sub ( loc );
float dist = vec.NormSafe () / this->mRadius;
if ( dist <= 1.0f ) {
dist = 1.0f - dist;
dist = dist * dist * this->mPull;
force.mX = vec.mX * dist;
force.mY = vec.mY * dist;
}
break;
}
case BASIN: {
ZLVec3D vec = origin;
vec.Sub ( loc );
float dist = vec.NormSafe () / this->mRadius;
dist = dist * dist * this->mPull;
force.mX = vec.mX * dist;
force.mY = vec.mY * dist;
break;
}
case LINEAR: {
force = this->mWorldVec;
break;
}
case RADIAL: {
force = origin;
force.Sub ( loc );
force.NormSafe ();
force.Scale ( this->mPull );
break;
}
}
switch ( this->mType ) {
case FORCE:
force.Scale ( 1.0f / mass );
acceleration.Add ( force );
break;
case GRAVITY:
acceleration.Add ( force );
break;
case OFFSET:
offset.Add ( force );
break;
}
}