1-to-1 Collision

package;

import flixel.FlxG;
import flixel.FlxSprite;
import flixel.FlxState;
import flixel.util.FlxColor;

class PlayState extends FlxState
{
    var spriteA:FlxSprite;
    var spriteB:FlxSprite;

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

        spriteA = new FlxSprite("assets/sprite.png");
        spriteA.x = 24;
        spriteA.y = FlxG.height / 2 - spriteA.height / 2;
        add(spriteA);

        spriteB = new FlxSprite("assets/sprite.png");
        spriteB.x = FlxG.width - 24 - spriteB.width;
        spriteB.y = FlxG.height / 2 - spriteB.height / 2;
        add(spriteB);

        spriteA.velocity.x = 150;
        spriteB.velocity.x = -150;
    }

    override public function update(elapsed:Float)
    {
        super.update(elapsed);

        FlxG.collide(spriteA, spriteB, collision);

        if (spriteA.x <= 0)
            spriteA.velocity.x *= -1;
        if (spriteB.x >= FlxG.width - spriteB.width)
            spriteB.velocity.x *= -1;
    }

    function collision(spriteA:FlxSprite, spriteB:FlxSprite)
    {
        spriteA.velocity.x = -150;
        spriteB.velocity.x = 150;
    }
}