Java:

CS:

//Geometria.java
import  java.lang.*;

class Punkt2D {

public double x, y;
}

class Linia2D {

public Punkt2D p1=new Punkt2D(), 
               p2=new Punkt2D(); 

public void skaluj(double d) {

 Punkt2D c = new Punkt2D();
 c.x = (p1.x+p2.x)/2;

 c.y = (p1.y+p2.y)/2;
 p1.x = c.x+(p1.x-c.x)* d;

 p1.y = c.y+(p1.y-c.y)* d;
 p2.x = c.x+(p2.x-c.x)* d;

 p2.y = c.y+(p2.y-c.y)* d;
}

public void przesun(Punkt2D p) { 

  p1.x += p.x; p1.y += p.y; 
  p2.x += p.x; p2.y += p.y; 

}

public boolean rownolegla(Linia2D l) {
 double dx1 = l.p2.x- l.p1.x,

        dy1 = l.p2.y- l.p1.y,
        dx2 = p2.x-p1.x,

        dy2 = p2.y-p1.y;
 return Math.abs(dx1*dy2-dy1*dx2)<0.0001?

                          true:false;
}

Linia2D lustroOX() {

 Linia2D l = new Linia2D();
 l.p1.x = p1.x; l.p1.y = -p1.y;

 l.p2.x = p2.x; l.p2.y = -p2.y;
 return l;

}
}

public class Geometria {

public static void main(String args[]) {
 Linia2D l1 = new Linia2D(),

         l2 = new Linia2D();
 Punkt2D p1 = new Punkt2D();

 l1.p1.x = l2.p1.x = 0;
 l1.p1.y = l2.p1.y = 0;

 l1.p2.x = l2.p2.x = 1;
 l1.p2.y = l2.p2.y = 1;

 p1.x = 1; p1.y = 2;
 l2.skaluj(2);

 l2.przesun(p1);
 System.out.println(l1.rownolegla(l2));

 l2 = l2.lustroOX();
}

}

//Geometria.cs
using System; 

class Punkt2D { 

public double x, y; 

} 

class Linia2D { 

public Punkt2D p1=new Punkt2D(), 
               p2=new Punkt2D(); 

public void Skaluj(double d)  { 

 Punkt2D c = new Punkt2D();
 c.x = (p1.x+p2.x)/2;

 c.y = (p1.y+p2.y)/2;
 p1.x = c.x+(p1.x-c.x)* d;

 p1.y = c.y+(p1.y-c.y)* d;
 p2.x = c.x+(p2.x-c.x)* d;

 p2.y = c.y+(p2.y-c.y)* d;
}

 

public void Przesun(Punkt2D p) {

  p1.x += p.x; p1.y += p.y; 
  p2.x += p.x; p2.y += p.y; 

} 

public bool Rownolegla(Linia2D l) { 
 double dx1 = l.p2.x- l.p1.x,

        dy1 = l.p2.y- l.p1.y,
        dx2 = p2.x-p1.x,

        dy2 = p2.y-p1.y;
 return Math.Abs(dx1*dy2-dy1*dx2)<0.0001?

                          true:false;
} 

Linia2D LustroOX() { 

 Linia2D l = new Linia2D();
 l.p1.x = p1.x; l.p1.y = -p1.y;

 l.p2.x = p2.x; l.p2.y = -p2.y;
 return l;

} 

public static void Main(string[] args)

{ 

 Linia2D l1 = new Linia2D(),

         l2 = new Linia2D();
 Punkt2D p1 = new Punkt2D();

 l1.p1.x = l2.p1.x = 0;
 l1.p1.y = l2.p1.y = 0;

 l1.p2.x = l2.p2.x = 1;
 l1.p2.y = l2.p2.y = 1;

 p1.x = 1; p1.y = 2;
 l2.Skaluj(2);

 l2.Przesun(p1);
 Console.WriteLine(l1.Rownolegla(l2)); 

 l2 = l2.LustroOX(); 
} 

}