IsEqualEpsilon
return IsEqualEpsilon(sx, 1.0, epsilon)
&& IsEqualEpsilon(shy, 0.0, epsilon)
&& IsEqualEpsilon(shx, 0.0, epsilon)
&& IsEqualEpsilon(sy, 1.0, epsilon)
&& IsEqualEpsilon(tx, 0.0, epsilon)
&& IsEqualEpsilon(ty, 0.0, epsilon);
return IsEqualEpsilon(shy, 0.0, epsilon)
&& IsEqualEpsilon(shx, 0.0, epsilon);
return IsEqualEpsilon(sx, other.sx, epsilon)
&& IsEqualEpsilon(shy, other.shy, epsilon)
&& IsEqualEpsilon(shx, other.shx, epsilon)
&& IsEqualEpsilon(sy, other.sy, epsilon)
&& IsEqualEpsilon(tx, other.tx, epsilon)
&& IsEqualEpsilon(ty, other.ty, epsilon);