func Vector3_xf_FromVector(v Vector) Vector3_xf {
return Vector3_xf{
X: exactfloat.NewExactFloat(v.X),
Y: exactfloat.NewExactFloat(v.Y),
Z: exactfloat.NewExactFloat(v.Z),
}
}
func TestMul(t *testing.T) {
tests := []struct {
v Vector
m float64
want Vector
}{
{Vector{0, 0, 0}, 3, Vector{0, 0, 0}},
{Vector{1, 0, 0}, 1, Vector{1, 0, 0}},
{Vector{1, 0, 0}, 0, Vector{0, 0, 0}},
{Vector{1, 0, 0}, 3, Vector{3, 0, 0}},
{Vector{1, -3, 5}, -1, Vector{-1, 3, -5}},
{Vector{1, -3, 5}, 2, Vector{2, -6, 10}},
}
for _, test := range tests {
if !test.v.Mul(test.m).ApproxEqual(test.want) {
t.Errorf("%v%v = %v, want %v", test.m, test.v, test.v.Mul(test.m), test.want)
}
vxf := Vector3_xf_FromVector(test.v)
wxf := Vector3_xf_FromVector(test.want)
mxf := exactfloat.NewExactFloat(test.m)
if !vxf.Mul(mxf).ApproxEqual(wxf) {
t.Errorf("%v%v = %v, want %v", mxf, vxf, vxf.Mul(mxf), wxf)
}
}
}
func (a Vector3_xf) ApproxEqual(b Vector3_xf) bool {
epsilon := exactfloat.NewExactFloat(1e-14)
return exactfloat.Abs(a.X.Sub(b.X)).LessThan(epsilon) &&
exactfloat.Abs(a.Y.Sub(b.Y)).LessThan(epsilon) &&
exactfloat.Abs(a.Z.Sub(b.Z)).LessThan(epsilon)
}