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Name 
PVector 
Examples  PVector v1, v2;
void setup() {
noLoop();
v1 = new PVector(40, 20);
v2 = new PVector(25, 50);
}
void draw() {
ellipse(v1.x, v1.y, 12, 12);
ellipse(v2.x, v2.y, 12, 12);
v2.add(v1);
ellipse(v2.x, v2.y, 24, 24);
}

Description 
A class to describe a two or three dimensional vector, specifically a Euclidean (also known as geometric) vector. A vector is an entity that has both magnitude and direction. The datatype, however, stores the components of the vector (x,y for 2D, and x,y,z for 3D). The magnitude and direction can be accessed via the methods mag() and heading().
In many of the Processing examples, you will see PVector used to describe a position, velocity, or acceleration. For example, if you consider a rectangle moving across the screen, at any given instant it has a position (a vector that points from the origin to its location), a velocity (the rate at which the object's position changes per time unit, expressed as a vector), and acceleration (the rate at which the object's velocity changes per time unit, expressed as a vector). Since vectors represent groupings of values, we cannot simply use traditional addition/multiplication/etc. Instead, we'll need to do some "vector" math, which is made easy by the methods inside the PVector class.

Fields 
x 
The x component of the vector 
y 
The y component of the vector 
z 
The z component of the vector 

Methods 
set() 
Set the components of the vector 
random2D() 
Make a new 2D unit vector with a random direction. 
random3D() 
Make a new 3D unit vector with a random direction. 
fromAngle() 
Make a new 2D unit vector from an angle 
copy() 
Get a copy of the vector 
mag() 
Calculate the magnitude of the vector 
magSq() 
Calculate the magnitude of the vector, squared 
add() 
Adds x, y, and z components to a vector, one vector to another, or two independent vectors 
sub() 
Subtract x, y, and z components from a vector, one vector from another, or two independent vectors 
mult() 
Multiply a vector by a scalar 
div() 
Divide a vector by a scalar 
dist() 
Calculate the distance between two points 
dot() 
Calculate the dot product of two vectors 
cross() 
Calculate and return the cross product 
normalize() 
Normalize the vector to a length of 1 
limit() 
Limit the magnitude of the vector 
setMag() 
Set the magnitude of the vector 
heading() 
Calculate the angle of rotation for this vector 
rotate() 
Rotate the vector by an angle (2D only) 
lerp() 
Linear interpolate the vector to another vector 
angleBetween() 
Calculate and return the angle between two vectors 
array() 
Return a representation of the vector as a float array 

Constructor  PVector()
PVector(x, y, z)
PVector(x, y)

Parameters 
x 
float: the x coordinate. 
y 
float: the y coordinate. 
z 
float: the z coordinate. 

Updated on March 16, 2016 10:39:11am EDT