What Point class are you referring to?

The function definitions aren't overloaded for parameters of type 'Point.' However, you can easily overload them yourself for whatever application you're working on.

The following example uses a simple Point2D class and an overloaded rect() function to let you pass two points (rather than four floats or ints) as the parameters. Since you're drawing a rect between two points, it's easy to pin one corner and draw to the mouse position without worrying about how wide your rectangle is.

Code:

Point2D left, right;

void setup(){
  size(400,400);
  left = new Point2D( 10, 200 );
  right = new Point2D( 100, 100 );
}

void draw(){
  background(0);
  right.x = mouseX;
  rect( left, right );
}

class Point2D{
  float x, y;
  Point2D( float x, float y ){
   this.x = x;
   this.y = y; 
  }
}

void rect( Point2D topLeft, Point2D bottomRight ){
  rect( topLeft.x, topLeft.y, bottomRight.x-topLeft.x, bottomRight.y-topLeft.y );
}
 

That's probably Java's java.awt.Point.
Note that recent versions of Processing have introduced PVector for this kind of usage (storing 2D and 3D coordinates, which can be "used as a position, velocity, and/or acceleration".
It has lot of useful methods...