Velocity

package;

import flixel.FlxG;
import flixel.FlxSprite;
import flixel.FlxState;

class PlayState extends FlxState
{
    var sprite:FlxSprite;

    override public function create()
    {
        super.create();

        sprite = new FlxSprite("assets/sprite.png");
        sprite.y = FlxG.height / 2 - sprite.height / 2;
        add(sprite);

        sprite.velocity.x = 100;
    }

    override public function update(elapsed:Float)
    {
        if (sprite.velocity.x > 0 && sprite.x >= FlxG.width - sprite.width)
        {
            sprite.x = FlxG.width - sprite.width;
            sprite.velocity.x *= -1;
        }
        else if (sprite.velocity.x < 0 && sprite.x <= 0)
        {
            sprite.x = 0;
            sprite.velocity.x *= -1;
        }

        super.update(elapsed);
    }
}