[solved] Angle of (vector A) and (vector B) via (vector O) ?

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recepboid..

[solved] Angle of (vector A) and (vector B) via (vector O) ?

in Programming Questions • 4 months ago

hi everyone ... i want to angle of X ?

thank you :)

Replies(6)

janjacobsv

Re: Angle of (vector A) and (vector B) via (vector O) ?

4 months ago

http://www.wikihow.com/Find-the-Angle-Between-Two-Vectors

Or maybe use the

angleBetween()

function, that should work...
probably use vectors A-O and B-O in the function

http://processing.org/reference/PVector_angleBetween_.html

recepboid..

Re: Angle of (vector A) and (vector B) via (vector O) ?

4 months ago

thank you janjacobsv .first link is not my way :)

and how can i do with angleBetween() code i dont know ? please some help...

janjacobsv

Re: Angle of (vector A) and (vector B) via (vector O) ?

4 months ago

Have you tried? maybe you can show your code and I can check what goes wrong.

janjacobsv

Re: Angle of (vector A) and (vector B) via (vector O) ?

4 months ago

It can be a bit tricky with vectors, You have three vectors discribing point in space, e.g (5,4)
angleBetween works on the directional vectors, to get the dirctional vector from point O to point A you have to substract them: O-A (or A.x-O.x, A.y-O.y)
do this as well for directional vector B-O and put those in the angle between:
angleBetween(A-O, B-O)

recepboid..

Re: Angle of (vector A) and (vector B) via (vector O) ?

4 months ago

thank you for advise janjacobsv :)

is it working ...

Copy code

PVector o = new PVector(40, 50);
PVector a = new PVector(40, 0);
PVector b = new PVector(80, 50);
float aoX = a.x-o.x;
float aoY = a.y-o.y;
float boX = b.x-o.x;
float boY = b.y-o.y;
PVector bo = new PVector(boX,boY);
PVector ao = new PVector(aoX,aoY);
float m = PVector.angleBetween(ao,bo);
println(int(degrees(m)));
line(a.x,a.y,o.x,o.y);
line(b.x,b.y,o.x,o.y);

quarks

Re: [solved] Angle of (vector A) and (vector B) via (vector O) ?

4 months ago

The code calculates the angle between the vectors correctly.

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