Use acceleration to change the velocity of a FlxObject over time.
// object will accelerate from left to right 250 pixels per second
object.acceleration.x = 250;
// if the object starts at velocity.x = 0:
// at 0.5 seconds, velocity.x = 125
// at 1.0 seconds, velocity.x = 250
// at 2.0 seconds, velocity.x = 500
// etc.
package;
import flixel.FlxG;
import flixel.FlxSprite;
import flixel.FlxState;
class PlayState extends FlxState
{
var sprite:FlxSprite;
override public function create()
{
bgColor = 0;
super.create();
sprite = new FlxSprite("assets/sprite.png");
sprite.y = FlxG.height / 2 - sprite.height / 2;
add(sprite);
sprite.acceleration.x = 400;
}
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 = 0;
sprite.acceleration.x *= -1;
}
else if (sprite.velocity.x < 0 && sprite.x <= 0)
{
sprite.x = 0;
sprite.velocity.x = 0;
sprite.acceleration.x *= -1;
}
super.update(elapsed);
}
}