public boolean contains(float x, float y) 
    { 
        float xDelta = x - getCenterX(), yDelta = y - getCenterY();
        return xDelta * xDelta + yDelta * yDelta < getRadius() * getRadius();
    }
public boolean contains ( float x , float y ) { float xDelta = x - getCenterX ( ) , yDelta = y - getCenterY ( ) ; return xDelta * xDelta + yDelta * yDelta < getRadius ( ) * getRadius ( ) ; }
Check if a point is contained by this circle

@param x The x coordinate of the point to check
@param y The y coorindate of the point to check
@return True if the point is contained by this circle