![enter image description here](https://i.stack.imgur.com/2KCCr.png)

I have currently the following line in my program. I have two other whole number variables, `x` and `y`.

I wish to see if this new point`(x, y)` is on this line. I have been looking at the following thread: 

[Given a start and end point, and a distance, calculate a point along a line](https://stackoverflow.com/questions/1800138/given-a-start-and-end-point-and-a-distance-calculate-a-point-along-a-line)

I've come up with the following:

```
if(x >= x1 && x <= x2 && (y >= y1 && y <= y2 || y <= y1 && y >= y2))
{
    float vx = x2 - x1;
    float vy = y2 - y1;
    float mag = sqrt(vx*vx + vy*vy);
    // need to get the unit vector (direction)
    float dvx = vx/mag; // this would be the unit vector (direction) x for the line
    float dvy = vy/mag; // this would be the unit vector (direction) y for the line

    float vcx = x - x1;
    float vcy = y - y1;
    float magc = sqrt(vcx*vcx + vcy*vcy);
    // need to get the unit vector (direction)
    float dvcx = vcx/magc; // this would be the unit vector (direction) x for the point
    float dvcy = vcy/magc; // this would be the unit vector (direction) y for the point

    // I was thinking of comparing the direction of the two vectors, if they are the same then the point must lie on the line?
    if(dvcx == dvx && dvcy == dvy)
    {
        // the point is on the line!
    }
}

```

It doesn't seem to be working, or is this idea whack?