# Returns closest point on segment to point : Geometry « 2D Graphics GUI « Java

Returns closest point on segment to point

```
import java.awt.Point;

public class Util{

/**
* Returns closest point on segment to point
*
* @param ss
*            segment start point
* @param se
*            segment end point
* @param p
*            point to found closest point on segment
* @return closest point on segment to p
*/
public static Point getClosestPointOnSegment(Point ss, Point se, Point p)
{
return getClosestPointOnSegment(ss.x, ss.y, se.x, se.y, p.x, p.y);
}

/**
* Returns closest point on segment to point
*
* @param sx1
*            segment x coord 1
* @param sy1
*            segment y coord 1
* @param sx2
*            segment x coord 2
* @param sy2
*            segment y coord 2
* @param px
*            point x coord
* @param py
*            point y coord
* @return closets point on segment to point
*/
public static Point getClosestPointOnSegment(int sx1, int sy1, int sx2, int sy2, int px, int py)
{
double xDelta = sx2 - sx1;
double yDelta = sy2 - sy1;

if ((xDelta == 0) && (yDelta == 0))
{
throw new IllegalArgumentException("Segment start equals segment end");
}

double u = ((px - sx1) * xDelta + (py - sy1) * yDelta) / (xDelta * xDelta + yDelta * yDelta);

final Point closestPoint;
if (u < 0)
{
closestPoint = new Point(sx1, sy1);
}
else if (u > 1)
{
closestPoint = new Point(sx2, sy2);
}
else
{
closestPoint = new Point((int) Math.round(sx1 + u * xDelta), (int) Math.round(sy1 + u * yDelta));
}

return closestPoint;
}
}

```

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