R2Vector
operator/(const R2Vector& vector, double a)
{
assert(a != 0);
return R2Vector(vector.X() / a,
vector.Y() / a);
}
void R3Matrix::
Scale(const R2Vector& scale)
{
// Scale matrix
XScale(scale.X());
YScale(scale.Y());
}
void R3Matrix::
Translate(const R2Vector& offset)
{
// Translate matrix
XTranslate(offset.X());
YTranslate(offset.Y());
}
R2Vector
operator*(const R3Matrix& a, const R2Vector& v)
{
// Multiply matrix by vector
RNCoord x = a.m[0][0] * v.X() + a.m[0][1] * v.Y();
RNCoord y = a.m[1][0] * v.X() + a.m[1][1] * v.Y();
return R2Vector(x, y);
}
R2Point
operator-(const R2Point& point, const R2Vector& vector)
{
return R2Point(point.X() - vector.X(),
point.Y() - vector.Y());
}
R2Halfspace::
R2Halfspace(const R2Point& point, const R2Vector& normal)
: line(point, R2Vector(-normal.Y(), normal.X()))
{
}
double operator%(const R2Vector& vector1, const R2Vector& vector2)
{
// Return cross product
return vector1.X()*vector2.Y() - vector1.Y()*vector2.X();
}
R2Vector operator*(const R2Vector& vector, double a)
{
return R2Vector(vector.X() * a,
vector.Y() * a);
}
R2Vector operator-(const R2Vector& vector)
{
return R2Vector(-vector.X(),
-vector.Y());
}