//----------------------------------------------------------------//
ZLVec2D USSurface2D::GetNorm ( const ZLVec2D& e0, const ZLVec2D& e1 ) {
ZLVec2D norm;
norm = e0;
norm.Sub ( e1 );
norm.Rotate90Anticlockwise ();
norm.Norm ();
return norm;
}
//----------------------------------------------------------------//
void MOAIVectorUtil::ComputeLineJoins ( MOAIVectorLineJoin* joins, const ZLVec2D* verts, int nVerts, bool open, bool forward, bool interior ) {
int top = nVerts - 1;
float scale = interior ? -1.0f : 1.0f;
if ( forward ) {
for ( int i = 0; i < nVerts; ++i ) {
joins [ i ].mVertex = verts [ i ];
}
}
else {
for ( int i = 0; i < nVerts; ++i ) {
joins [ i ].mVertex = verts [ top - i ];
}
}
for ( int i = 0; i < nVerts; ++i ) {
ZLVec2D v0 = joins [ i ].mVertex;
ZLVec2D v1 = joins [( i + 1 ) % nVerts ].mVertex;
ZLVec2D n = v1;
n.Sub ( v0 );
n.Norm ();
joins [ i ].mEdgeVec = n;
n.Rotate90Anticlockwise ();
n.Scale ( scale );
joins [ i ].mEdgeNorm = n;
joins [ i ].mIsCap = false;
}
int start = 0;
int max = nVerts;
if ( open ) {
joins [ 0 ].mIsCap = true;
joins [ 0 ].mJointNorm = joins [ 0 ].mEdgeNorm;
joins [ top ].mIsCap = true;
joins [ top ].mEdgeVec = joins [ top - 1 ].mEdgeVec;
joins [ top ].mEdgeNorm = joins [ top - 1 ].mEdgeNorm;
joins [ top ].mJointNorm = joins [ top ].mEdgeNorm;
start = 1;
max = top;
}
for ( int i = start; i < max; ++i ) {
ZLVec2D n = joins [( i + top ) % nVerts ].mEdgeNorm;
n.Add ( joins [ i ].mEdgeNorm );
n.Norm ();
joins [ i ].mJointNorm = n;
}
}