I assume your values are

`int`

.

There is a function called

`Math.Abs(...)`

.

[EDIT]

Your function is broken. Coordinates may be in general positive as well as negative (a point may lay in any of the four

quadrants[

^]). If you take the absolute value of the coordinates

**before** you calculate the coodinate distance results in wrong results. Take the values as they are.

public int GetDistanceFromEntity(Entity Entity)
{
int deltaX = Entity.PositionX-PositionX;
int deltaY = Entity.PositionY-PositionY;
return (int)Math.Sqrt(deltaX*deltaX + deltaY*deltaY);
}

You can test it with points in all quadrants and in both directions:

var q1=new Entity(1, 2);
var q2=new Entity(-3, 2);
var q3=new Entity(-3, -1);
var q4=new Entity(4, -1);
var p0=new Entity(0, 0);
Assert.AreEqual(0, q1.GetDistanceFromEntity(q1), "identiy should have distance 0");
Assert.AreEqual(0, q2.GetDistanceFromEntity(q2), "identiy should have distance 0");
Assert.AreEqual(0, q3.GetDistanceFromEntity(q3), "identiy should have distance 0");
Assert.AreEqual(0, q4.GetDistanceFromEntity(q4), "identiy should have distance 0");
Assert.AreEqual(0, p0.GetDistanceFromEntity(p0), "identiy should have distance 0");
Assert.AreEqual(q2.GetDistanceFromEntity(q1), q1.GetDistanceFromEntity(q2), "distance should be invariant");
Assert.AreEqual(q3.GetDistanceFromEntity(q1), q1.GetDistanceFromEntity(q3), "distance should be invariant");
Assert.AreEqual(q4.GetDistanceFromEntity(q1), q1.GetDistanceFromEntity(q4), "distance should be invariant");
Assert.AreEqual(p0.GetDistanceFromEntity(q1), q1.GetDistanceFromEntity(p0), "distance should be invariant");
Assert.AreEqual(4, q1.GetDistanceFromEntity(q2), "distance q1-q2 mismatch");
Assert.AreEqual(5, q1.GetDistanceFromEntity(q3), "distance q1-q3 mismatch");
...

[/EDIT]

Cheers

Andi