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# flixel
  • a
    this is the specific channel :3
  • t
    ^
  • e
    oh cool!! ty
  • e
    i've been tryina learn by just editing the default platformer project you get with the create command i'm tryina add a run button. it works, your max speed increases when holding it but when you let go it just cuts back to your lower speed. i figured the best way to ease back to the walk speed is with flxtween, but i cant figure out how to cancel the tween in the case you press shift again the documentation shows how to put it in a variable and use .cancel, but i dont know how to call it if i put it in one
  • t
    sorry but can you describe what you're trying to do?
  • a
    with a tween you get a return type that you can store a reference to (like in the class)
  • a
    you can call cancel on that
  • e
    i want it so when shift is pressed, you start running and your max speed is increased, allowing you to gain more momentum. it works however, when you release the run button, due to maxVelocity setting to 90, you cut back to a lower speed i want to make you slow down progressively over the course of a second. i assume this can be done with tweens, but i feel like it might break if you start running again and the velocity is set to 180. im not sure how to cancel a tween
  • t
    ^
  • t
    as billy said
  • t
  • a
    you say you "feel like it may break", you should try it
  • a
    cause i think your instinct is leading you in the right direction
  • a
    if it doesn't work as well as you expect you can always optimise or ask questions on that
  • e
    how does this look? gonna compile & see if it works
  • e
    aight nvm
  • t
    I think you could've stored it in variable too
  • t
    yep
  • w
    Honestly I wouldn't use a tween for this
  • w
    i wish you wrapped your code in code tags so I could copy/paste and edit it \`\`\`hx // code here \`\`\`
  • e
    aight put it in a variable & didnt get the same error, so making progress
    Copy code
    hx
        if (FlxG.keys.anyPressed([SHIFT, CONTROL]))
        {
            if (playerRunning == false)
            {
                playerRunning = true;
                speedTween.cancel();
                maxVelocity.set(180, JUMP_SPEED);
                trace('running');
            }
        }
        else if (playerRunning == true)
        {
            playerRunning = false;
            speedTween();
            trace('no longer running');
        }
  • e
    Copy code
    hx
    var speedTween:FlxTween;

//pretend the new function is here
        speedTween = FlxTween.tween(maxVelocity, {x: 90}, 0.75);
  • w
    can do something simple like
    Copy code
    hx
inline static var RUN_SPEED = 180;
inline static var WALK_SPEED = 90;
/** the time it takes to increase maxspeed to run speed */
inline static var SPEED_UP_TIME = 0.5;//seconds
/** the amount max speed increases by each second when holding run */
inline static var SPEED_INCREASE = (RUN_SPEED - WALK_SPEED) / SPEED_UP_TIME;
    ...elsewhere...
    Copy code
    hx
// in update(elapsed:Float)
var runPressed = FlxG.keys.pressed([SHIFT, CONTROL]);
if (runPressed && maxVelocity.x < RUN_SPEED)
{
    // increase max speed
    maxVelocity.x += SPEED_INCREASE * elapsed;
    // prevent it from going too high
    if (maxVelocity.x > RUN_SPEED)
        maxVelocity.x = RUN_SPEED;
}
else if (runPressed == false && maxVelocity.x > WALK_SPEED)
{
    // decrease max speed
    maxVelocity.x = SPEED_INCREASE * elapsed;
    // prevent it from going too low
    if (maxVelocity.x < WALK_SPEED)
        maxVelocity.x = WALK_SPEED;
}
  • w
    this just gradually lowers it to walk speed when not pressed, and raises it when pressed
  • w
    you don't have to manage tweens now
  • w
    i spelled maxVelocity wrong every damn time...
  • a
    hahaha
  • e
    Veocity
  • e
    ohhh kk i think i get it you use RUN_SPEED and WALK_SPEED as a maximum then add the speed increase to the maxVelocity until it hits that maximum that way you can switch between them at any time and holding shift just switches between the max
  • e
    you got it right here
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