Angle between 2 vectors

[Kilinich]

In many cases I need to calculate signed angle between 2 vecs.
I do some maths and it can be handy for you:

Code: Select all

// Scalar multiplication
Scene.my.vpr2 := (v1, v2)=>{v1(0) * v2(0) + v1(1) * v2(1)};
// Length
Scene.my.vmod2 := (v)=>{(v(0) ^ 2 + v(1) ^ 2) ^ 0.5};
// Determinant
Scene.my.opm2 := (m)=>{m(0)(0) * m(1)(1) - m(1)(0) * m(0)(1)};

// Angle
Scene.my.va := (v1, v2)=>{(scene.my.opm2([v1, v2]) >= 0 ? 1 : -1) * math.acos(scene.my.vpr2(v1, v2) / scene.my.vmod2(v1) / scene.my.vmod2(v2))};

//Example
Scene.my.va([1,1],[0,10])
//gives 0.7853982 (pi/4)


[Rideg]

NIce theese could be very useful. I think I use pythagora's method. I can't really remember the name

[Mystery]

Do you mean Pythagoras theorem? Part of his code use that anyway.
Anyways it's actually a quite useful piece of code