Is there a glitch with "lerp"?

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  • "Wallt of text"? ...

    Anyhow, when you mention "t" being 1, I have to admit, I'm sort of copying how I saw lerp done before in other .caps, and thought, "Wow, this has a cool, neat motion from one object to another. PERFECT for my little pause menu thingy! How do I do this?"

    Secondly, when I tried creating an internal value for the "Objects" menus to move to, like mano suggested, as I mentioned, the objects couldn't move to that Y position. If I told them their Y destination was their own internal value, they would glithc up and move to that -8.34534whatever-e coordinate that I mentioned in a previous post.

    However, if there's a problem with whatever you're referring to as "t" being 1, I'd have no idea what that problem would cause. All I could really get was that you type out, lerp(current position, destination, 1, - time you want this movement done in ^ TimeDelta).

    Also, I didn't know about cosp. That's pretty cool. ^^ Unfortunately, when trying it out, it seems to drop the FPS down a bit.

  • after trying it out myself its more complicated then it seems. not the lerp part just getting each option to expand correctly every sub level in few events. but jfyi you can however try putting all your menus in two families and using for each family1 ordered by ascending family1.y. and family2.y > family1.y set abovedistance pv to dist(0,.y,0,family1) this will give you the distance for the closest text object thats above each text if there are none it will be 0. to get the distance of closest object below do for each family1 ordered by descending family1.y. and family2.y < family1.y set belowdistance pv to dist(0,.y,0,family1). probably hard to get without screenshot or cap but... anyway, you may be able to toy with that to push your text up/down. but i think it would just be easiest to just make containers of each stacked menu group and do lerp events with those.

    the condition lerp(.y,'mytargety', 0.20) works fine for me. just to move the text. and btw u might want to change that ^ timedelta to * 100* timedelta. 0.00001 ^ timedelta is like not even moving for a year. might even be causing an error. hope thats somewhat useful. gl

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  • EDIT: see next post:

  • ok, so here's an example with the FontSprite object: At least try the exe:)

    even if the original poster doesn't want to use it, this will explain some of the things you can do with it, and how to do them. hope it helps someone

    try the exe first, so you know what the events you're looking at are for, and what they will do in the end.

    I only made it work with first and second options, and once you open the option, you can't do anything else. though, as you will see, adding new options only requires you to add one small event, and no guesswork as to how tall all the text for the submenu is

    look through the cap a little, to get a basic idea of what's going on before reading the tutorial

    after each screenshot, I will break down the actions one by one, so don't let them overwhelm you.

    EXE

    CAP

    link to plugin

    also, before we get started, don't be intimidated by the long post, it's actually only four main events, and I broke down each step really far since most people have never used this plugin:

    <img src="http://dl.getdropbox.com/u/1013446/New%20folder%20%283%29/Capture5.PNG">

    how it works:

    <img src="http://dl.getdropbox.com/u/1013446/New%20folder%20%283%29/Capture1.PNG">

    ok, in the start of layout, you choose your sprite, and set up which characters are which,

    basically you tell it which frames of the sprite animation have which letters.

    it's not as confusing as it looks in the screenshot, basically I'm giving a range of characters like 'a' through 'z', and saying these letters start of frame 33, the letters are stored in a sprite animation, frame 33 is 'a', frame 34 is 'b', frame 35 is 'c', etc. if you have questions, look at the cap later, don't let this part worry you for now. it's really quite simple when you try it for yourself

    you'll notice that the last line contains our whole menu, if you've never used the newline expression before, it's like pressing enter, so

    "first"&newline&"second"&newline&"third"&newline&"fourth"&newline&"fifth"[/code:l8egaw9v]
    
    will type on the screen:
    [code:l8egaw9v]first
    second
    third
    fourth
    fifth
    [/code:l8egaw9v]
    
    <img src="http://dl.getdropbox.com/u/1013446/New%20folder%20%283%29/Capture2.PNG">
    you can ignore the actions in the brackets, that's setting up a new fontsprite the same way as the first, if you are familiar with the 'function' object, you'll only need those actions once
    
    so it goes like this, 
    
    [code:l8egaw9v]On Left Clicked on sprite[/code:l8egaw9v]
    
    each letter is a sprite, so that means if the player clicks on any letter
    this event triggers
    
    [code:l8egaw9v]Pick Current Word[/code:l8egaw9v]
    
    this takes that sprite, and goes back to the fontobject
    now it's picked every sprite that makes up the word that the sprite was a part of
    so if you click on the sprite for "i" in the word "first"
    it picks every sprite that makes up the word "first"
    
    [code:l8egaw9v]SpriteFont.CurrentWord Equal to "first"[/code:l8egaw9v]
    
    here's where the magic happens
    if the word they clicked on (the 'CurrentWord') is equal to "first", this event will trigger
    <img src="http://dl.getdropbox.com/u/1013446/New%20folder%20%283%29/Capture6.PNG">
    you then create a SpriteFont2 object (just another spritefont, for the submenu)
    I created it at 
    x= spritefont.phraseleft (the left edge of the all the letters) +30 (for an indent)
    and 
    y = Sprite.Top+spritefont.newlineheight 
    
    remember, when we picked Current Word, we picked the sprites that make up that word, 
    spritefont ignores hotspots, so 'newlineheight'  measures from the top of the letter sprite (the sprites that make up the word we clicked on),
    so sprite.top+newlineheight, is where it would be writing the next line if you weren't doing a weird menu thing, 
    this means that your submenu (we just created, SpriteFont2) is positioned exactly as if you had just put a regular newline after the word you clicked on, with no guesswork
    
    then those actions in brackets, are the same setup things we did for the original menu
    
    the Showtext again, this time with SpriteFont2 with all our submenu option separated again by Newlines
    <img src="http://dl.getdropbox.com/u/1013446/New%20folder%20%283%29/Capture8.PNG">
    
    [code:l8egaw9v]SpriteFont:Set private variable "option" to spritefont.WordPositionInPhrase[/code:l8egaw9v]
    
    we make a private variable called option, to keep track of what the player clicked on.  as you'll see, you won't need a different event for each option from here on out
    
    WordPositionInPhrase is just that
    
    [code:l8egaw9v]"hello, how are you?"[/code:l8egaw9v]
    
    so the WordPositionInPhrase for "hello" is 0, "how" is 1, "are" is 2, etc...
    
    you are setting the private variable "option", to this number, so you can remember which word you clicked on for later, this will make sense in a minute
    
    [code:l8egaw9v]SpriteFont:Set private variable "submenuopen" to "yes"[/code:l8egaw9v]
    
    the default is set to "no", so we can use this later to see if the submenu is open or not
    
    [code:l8egaw9v]SpriteFont2:For Each Character
    Sprite:Set opacity to 0[/code:l8egaw9v]
    
    I did this so the submenu is invisible until we've made space for it
    
    <img src="http://dl.getdropbox.com/u/1013446/New%20folder%20%283%29/Capture3.PNG">
    [code:l8egaw9v]"submenuopen" equal to "yes"
    
    trigger once[/code:l8egaw9v]
    once the menu is open, we want to do this one time
    
    [code:l8egaw9v]SpriteFont:for each character
    
    SpriteFont:Private Variable "option" less than SpriteFont.WordPositionInPhrase[/code:l8egaw9v]
    Remember how we set "option" to the word number earlier?
    now every letter that is in a word AFTER that original option, will trigger this event
    so we set in each letter/sprite:
     a private variable:
    [code:l8egaw9v]StartHeight = .y (the current y position)[/code:l8egaw9v]
    
    (where it is now, the beginning of the scrolling)
    
    [code:l8egaw9v]EndHeight = StartHeight + SpriteFont2.PhraseHeight + 7[/code:l8egaw9v]
    
    and we want it to end at the end of our submenu
    
    PhraseHeight calculates the distance from the top pixel of the highest word in the phrase, to the lowest pixel at the bottom of the phrase, so this is how big, vertically, the submenu is.
    why +7? 
    because as I said before, spritefont ignores hotspots, so this is to compensate 
    you can just do this by trial and error, or by checking the position of the sprite hotspot in the sprite editor
    
    almost home...
    <img src="http://dl.getdropbox.com/u/1013446/New%20folder%20%283%29/Capture4.PNG">
    once again
    
    [code:l8egaw9v]SpriteFont:private variable SubmenuOpen equal to "yes"?
    For Each Word
    Value of "option" less than WordPositionInPhrase?[/code:l8egaw9v]
    
    these are the same as in the last step
    if the submenu is open, check each word and see if it comes after the wordnumber of the option that was clicked on, if so, we need to scroll it
    
    now
    [code:l8egaw9v]Sprite.Value('EndHeight') greater than .y?[/code:l8egaw9v]
    if so, the sprites haven't scrolled down enough
    so
    I made a counter to use with lerp to move the sprites
    
    it's a private variable in FontSprite2 called 'counter'
    it starts at 0
    
    [code:l8egaw9v]SpriteFont2('Counter') : Add 0.5 * timedelta[/code:l8egaw9v], this will add a tiny number to 'counter', 
    
    that will vary based on framerate, to make sure it moves at the same speed on any computer, regardless of slowdown, 
    if you don't care about slow down, you could have just put 'Add 0.1'
    
    [code:l8egaw9v]Set Y to lerp(('StartHeight'),('EndHeight'),SpriteFont2('counter'))[/code:l8egaw9v]
    
    quazi explained how lerp works, a number between 0 and 1, takes you from the first number to the second number, we set startheight and endheight variables for each sprite(each letter), to take it from where it was to  where it was  +  the height of the submenu
    
    now we've taken care of scrolling the sprites, and stopping the sprites,
    because if they've gotten to the end, then the event:[code:l8egaw9v]Sprite.Value('EndHeight') greater than .y?[/code:l8egaw9v] won't be true anymore, so they will stop scrolling
    
    all that's left now is making the submenu not invisible anymore when we're done scrolling
    
    [code:l8egaw9v]Sprite.Value('EndHeight') less than or equal to .y?[/code:l8egaw9v]
    
    this will be true when the sprites reach their final destination after they are done scrolling where they need to be...
    it's opposite of the last event, so  you could have also just used "else"
    
    [code:l8egaw9v]SpriteFont2:for each character[/code:l8egaw9v]
    
    remember, spritefont2 is the submenu, so now this will pick each sprite in those words one at a time
    
    [code:l8egaw9v]SpriteFont2:Opacity less than 100[/code:l8egaw9v]
    
    remember we set it to opacity to 0?
    
    [code:l8egaw9v]Sprite: Set opacity to .opacity + (50*timedelta)[/code:l8egaw9v]
    
    again, if you don't care that it goes at the exact same speed during slow down, you could have just put opacity +1
    since this will keep being true until it's no longer transparent at all (opacity = 100), it  gives you a nice slow fade in for the the sub menu...
    
    as you can see, using this method, you don't have to keep guessing how much distance there is for different menus, or setup many objects for each word, and even though it's alot to take in the first time you use the spritefont object
    it has a very simple logic to it, once you get over the initial learning curve
    
    if you use functions with this example, the code could be drastically reduced
    you could have also used "else", and a private variable to show whether it was a menu, or a submenu instead of a second spritefont object to reduce it further
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