Graphmath.Vec2.perp_prod

You're seeing just the function perp_prod, go back to Graphmath.Vec2 module for more information.
Link to this function

perp_prod(a, b)

Specs

perp_prod(vec2(), vec2()) :: float()

perp_prod( a, b ) finds the perpindicular product of one vec2 with another vec2.

a is the first vec2.

b is the second vec2.

The perpindicular product is the magnitude of the cross-product between the two vectors.

It returns a float of the value (a<sub>x</sub>b<sub>y</sub> - b<sub>x</sub>a<sub>y</sub>).