Entity Equation

For the quadratic equations, I was thinking to add a equation method to the cadentity class and for that, I'll be first needing to port some maths stuff.

Your views over this ?

the lc_quadratic contains an equation in a form of quadratic, namely,

{x, y}.m_mQuad.{{x},{y}} + m_vLinear.{{x},{y}}+m_dConst = 0

Can you explain your ideas about equations in details?