Copying PVectors in Processing

Question

PVector a = new PVector(1, 2);
PVector b = a;
PVector c = a.copy();
PVector d = a.get();

Not using .copy() method change one of my drawing.Is there any differences between b, c, d PVectors???

Answer 1

get() and copy() are functionally identical -- each returns a deep copy of the PVector.

PVector b = a; creates a reference b that points to the same PVector object that a points to.

Therefore, there are differences between the b, and c & d PVectors.

Let's use your code and change the value of a after instantiating the other variables to see how they differ:

PVector a = new PVector(1, 2);

PVector b = a;
PVector c = a.copy();
PVector d = a.get();

a.x = 4;

println(a.x);
println(b.x);
println(c.x);
println(d.x);

Output:

4.0
4.0
1.0
1.0