Need help creating player entity

[nightm4re94]

^{This post has been migrated automatically from the old LITIENGINE forum (2018 - 2022).
Posted: 2018-11-13 17:38:33
User: CalvinMT [] (age: 1451 days 🔥; posts: 114)}
I'm having trouble creating an entity movable with the keyboard.
````java // I created a Player class which extends Creature:
protected Player () {
this.setSpritePrefix("player.png");
this.setLocation(centerOfScreen);
}
// Now, I tried adding it to the environment as so in the game class:
Game.load("map.litidata");
Game.loadEnvironment(new Environment(Game.getMap("map")));
Player player = new Player();
player.setController(MovementController.class, new KeyboardEntityController(player));
Game.getEnvironment().add(player);````
The screen shows up, but nothing happens. The map doesn't even appear... :/
And I don't know if a Creature would even be movable with arrows or WSQD.
I tried looking into your "ldjam42 - GoIn" source code and understood some features a bit better. But alas, did not suit my needs.
It would be great if someone could point me in the right direction.
Thanks.

[nightm4re94]

<sup>This post has been migrated automatically from the old LITIENGINE forum (2018 - 2022).
Posted: 2018-11-14 23:09:18
User: CalvinMT [] (age: 1451 days 🔥; posts: 114)</sup>
I managed to get the map to appear without the player (can't remember how, but it was something dumb).
Another problem now is that only a quarter of the map is showing at the bottom right of the screen. In other words, the top-left corner of the map is in the center of the screen, and not in the top-left corner of the screen where it is supposed to be. And I can't find a function to adjust it... :/
Anyone, please?

[nightm4re94]

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Posted: 2018-11-15 07:53:18
User: Jikai [] (age: 1449 days 🔥; posts: 13)</sup>
CalvinMT Did you set the camera? Maybe it's pointing a corner by default, I saw a code snippet somewhere where you had to setup the camera to the player

[nightm4re94]

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Posted: 2018-11-15 09:51:35
User: CalvinMT [] (age: 1451 days 🔥; posts: 114)</sup>
Wow, thanks! I forgot about in-game cameras.
I wanted a fixed camera to see the entire map, and I have it.
All I'm missing now is the player.
Do I need to added it to a map on top of adding it to the environment?
Because it has a sprite and a location, and I don't know what it would be missing. Unless it isn't supposed to extend Creature (but that doesn't make sense...)?

[nightm4re94]

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Posted: 2018-11-15 14:38:34
User: Jikai [] (age: 1449 days 🔥; posts: 13)</sup>
CalvinMT Can you provide the version of the build you are using?
Also post your code here, where you add all to the environment.
Creature extends Entity, CombatEntity and collisionEntity. It also implements IEntity, so it should work...
Normally you just have to add all to Environment, are you sure you're adding it to the Active environment?
Did you do something like Game.getEnvironment().add(new Player()); ?

[nightm4re94]

<sup>This post has been migrated automatically from the old LITIENGINE forum (2018 - 2022).
Posted: 2018-11-15 14:49:29
User: CalvinMT [] (age: 1451 days 🔥; posts: 114)</sup>
Jikai I'm using "litiengine-0.4.13" and "JavaSE-1.8". I think that's what you asked for.
There's no much more than what I firstly posted.
@Override public void prepare () { super.prepare(); // Initialize Game final double screenCenterX = Game.getScreenManager().getResolution().getWidth() / 2.0; final double screenCenterY = Game.getScreenManager().getResolution().getHeight() / 2.0; Player player = new Player(screenCenterX, screenCenterY); Game.load("resources/maps/map_test.litidata"); Game.loadEnvironment(new Environment(Game.getMap("map_test"))); Game.getCamera().setFocus(screenCenterX, screenCenterY); Game.getEnvironment().add(player); // ---------- ---------- Input.keyboard().onKeyPressed(KeyEvent.VK_UP, (key) -> player.move(Direction.UP)); Input.keyboard().onKeyPressed(KeyEvent.VK_DOWN, (key) -> player.move(Direction.DOWN)); Input.keyboard().onKeyPressed(KeyEvent.VK_LEFT, (key) -> player.move(Direction.LEFT)); Input.keyboard().onKeyPressed(KeyEvent.VK_RIGHT, (key) -> player.move(Direction.RIGHT)); Input.keyboard().onKeyTyped(KeyEvent.VK_ESCAPE, (key) -> { Game.getScreenManager().displayScreen(MenuScreen.NAME); Game.getScreenManager().getRenderComponent().setCursor(new ImageIcon("resources/cursor_white_64.png").getImage(), 0, 0); try { // Finalizes this instance of InGameScreen this.finalize(); } catch (Throwable e) { e.printStackTrace(); } }); }

[nightm4re94]

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Posted: 2018-11-15 19:28:09
User: CalvinMT [] (age: 1451 days 🔥; posts: 114)</sup>
Every test I do seems correct.
System.out.println(Game.getEnvironment().getEntities()); // Returns: [player (resources/player_32.png) #-1] System.out.println(Game.getEnvironment().getCreature("player").getLocation()); // Returns: Point2D.Double[624.0, 344.0] which is the center of the screen
I think the problem is coming somewhere around the image.
The image is a 32 by 32 PNG.
It is loaded as followed in the Player class (see 1st post):
this.SpritePrefix("player_32.png");
I don't even know what "Prefix" is supposed to mean in a sprite, but it looks like it's working according to the return of "getEntities()".
I tried to set the size and even took a different image, but nothing changes.
It's driving me crazy.

[nightm4re94]

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Posted: 2018-11-17 00:45:08
User: CalvinMT [] (age: 1451 days 🔥; posts: 114)</sup>
Ok, just found out about the "sprites.info" file...
I was wondering all along where the sprites location was added in the code. My bad I didn't look all the way down at the end of the sprites folder in the "ldjam42 - GoIn" source code...
So I managed to import the sprites in the utiLITI, but when I want to create a creature, I nothing appears in the drop-down list to select a sprite. I tried re-importing the map and re-loading utiLITI but nothing changed. Any ideas?
P.S.: you guys should really get out a tutorial and some documentation. Even if it's fast and meaningless, at least it will point users in the right direction.
P.P.S.: and I don't mind people telling me that the code I posted is right or wrong without much explanation. Again, it at least gives an indication and point me in the right direction.

[nightm4re94]

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Posted: 2018-11-17 09:12:57
User: CalvinMT [] (age: 1451 days 🔥; posts: 114)</sup>
Done!
All I needed to do was to add the sprite to the map with utiLITI and enter this:
player.addController(new PlayerAnimationController(player));
And here's the code from the class PlayerAnimationController(Player player):
public PlayerAnimationController(Player player) { super(player, new Animation(Spritesheet.find(player.getSpritePrefix()), true)); this.add(new Animation(Spritesheet.find(player.getSpritePrefix()), true)); }
It doesn't work every time. When I start the game, sometimes the sprite appears, but sometimes it doesn't.
I'll leave a note by if I find out why.

[nightm4re94]

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Posted: 2018-11-17 17:58:49
User: nightm4re [Admin 👑, Mod 🔧] (age: 1567 days 🔥; posts: 185)</sup>
Hey and sorry for being quiet so far.
This weekend, we're working on a tutorial creating a small example game for LITIengine from A to Z.
We expect a lot of questions to get answered once people get to see the tutorial.
We'll get back to your request, please stay patient for some more hours.

[nightm4re94]

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Posted: 2018-11-18 00:11:17
User: CalvinMT [] (age: 1451 days 🔥; posts: 114)</sup>
Great news!
I promise to be patient, then.
It is true that I might have forgot that this is an alpha, and things such as code structure and functions might change.
But important stuff like AnimationControllers, sprites.info, the fact that you need to actually use the utiLITI (in a way that it isn't just an optional software) so that the LITIengine works; they should all be mentionned because they are essential to know.
I hope I didn't make too much of a scene, but being left without being answered while others are caused me a little of frustration.
Please forgive my overreaction.

[nightm4re94]

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Posted: 2018-11-18 09:55:26
User: nightm4re [Admin 👑, Mod 🔧] (age: 1567 days 🔥; posts: 185)</sup>
I really appreciate your patience and the way you've managed to figure out what's going on with your problem by yourself. It's just that we're two guys doing this noncommercially and working on documentation while enhancing the product itself and building a community, that's consuming tons of time. We have a new contribution guide in the repository where you can find hints on the various things we need help with (that's the point of open source projects, right?). Let us know if there's anything specific you want to work on 😊

[nightm4re94]

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Posted: 2018-11-18 16:57:04
User: steffen [Admin 👑, Mod 🔧] (age: 1568 days 🔥; posts: 100)</sup>
CalvinMT
> the fact that you need to actually use the utiLITI (in a way that it isn't just an optional software) so that the LITIengine works ...
That's not exactly true. In fact, one of our main contributors to the engine @TheRamenChef doesn't use the editor at all. We just think that the utiLITI editor brings some very helpful stuff to the table especially for new users. A workflow without the editor is totally possible but is a bit harder to get into.
It's true that we design the engine with the editor in mind but using the engine without it is absolutely possible.

[nightm4re94]

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Posted: 2018-11-19 05:58:01
User: Jikai [] (age: 1449 days 🔥; posts: 13)</sup>
> CalvinMT Spritesheet.find(player.getSpritePrefix()
I’ve got a nullPointer for this part. I’ve set the prefix in the player entity but how do you specify where is the sprites.info? Does it find it by itself?
My sprites and the .info are located in sprites/sprites.info.
Sorry for not replying before @CalvinMT but I’m trying to figure out on my side as well haha!

[nightm4re94]

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Posted: 2018-11-19 11:23:06
User: CalvinMT [] (age: 1451 days 🔥; posts: 114)</sup>
Jikai
We're fine! XP
You can put "sprites.info" in any folder that you want.
Inside it, you need to write something like:
#PLAYER player.png, 32, 32;250, 250, 400, 250
The first part is the name of the file containing the player's sprites.
The second and third parts are the sprites size (I'm guessing they all need to be the same size).
And the last part, after the ";", is the duration that each sprite will take before the next one (sprite1 will take 250ms, sprite2: 250ms, sprite3: 400ms, sprite4: 250ms (I think they're milliseconds)).
Then, one way of doing it is by loading those sprites with the utiLITI.
To do so, first open utiLITI and import your map.
After that, go to: Project -> Import Spritefile...
And select your "sprites.info" file.
Save and done.

[nightm4re94]

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Posted: 2018-11-20 01:10:35
User: steffen [Admin 👑, Mod 🔧] (age: 1568 days 🔥; posts: 100)</sup>
CalvinMT
Good to see that you figured out this workflow. I also agree that this process should be documented better. But we'll get there 😄
A few notes on this:

• - "The Spritefile Workflow" is a workflow that was present before the utiLITI editor even existed. It allowed us for some automated workflows that included a small Photoshop script which auto-generated these files from layers. Typically a spritefile is used for a batch import process.
• - "The UI Workflow" is an alternative approach on this and allows to directly import image files from the filesystem. It then let's you specify the ~~KeyFrame duration over the utiLITI UI. (****Project -> Import Spritesheets...**). The amount of keyframes will then automatically be provided, depending on the ~~~~spritewidth and ~~~~spriteheight. You can later adjust the provided Spritesheet settings by navigating to your ~~~~Spritesheet in the "Resources" explorer and clicking the pen icon (**~~Resources Explorer -> Edit Asset****).

[nightm4re94]

<sup>This post has been migrated automatically from the old LITIENGINE forum (2018 - 2022).
Posted: 2018-11-20 09:58:01
User: CalvinMT [] (age: 1451 days 🔥; posts: 114)</sup>
Jikai
It adds lines like these:
<spriteSheets> <sprite width="32" height="32" name="player_32"> <image>iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAABGUlEQVR42uWXPQ6DMAyFIzXqteBO7NAjdOACZO4cNli4Q+deoFO3DjRGREoCgfwJq+JJlhDEeZ8gdgIZEUVA84UWVVVNA/I8XzyLDc18DSDLsuPMTYDDzVUAFHMJgGZOlBEo5hIAzdxWhrao69pa003TaGP7vk8L4NFczJxXNEBAh9NyowAi2uwUsL52q8BmXhRFMADn3O0tbAEk2GzUeSgawLy53bEBnqcHYNiL8OoNwBgLNh+GIb4MUzQiudX/byv2haCUmjmfIABQ13XavbZtnb45BOQGb8dbrzTpYWQNwEwWl195btwzlgtO6E1ctVKv49bZEVSWpRaLvx0fSQDXCWCdiXhAa53jJuJCQhVFn0Ko5sonOK9+N9jlL71CNcYAAAAASUVORK5CYII=</image> <keyframes>250</keyframes> </sprite> <sprite width="32" height="32" name="ennemy1_32"> <image>iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAAnElEQVR42mP4z8DwfyAxw6BxAAOdwdB2AFBx/X8rq2Uo+P9/eZo7gOh4pbYDyE5g1HAAxamcEgdQLauR4wCq5/ch5QCalXpDwgFAhj3Nyv7//1kIOwBUqtHKAXJyEwbWAaghPTIdsJ+wA4C1Gg0TIdtoOTBaFwyd6nhQNEgGRZNsUDRKMTQDazVQqYZkaT1QjHnkdExo4oAR2zsGAKzmT6qppX1QAAAAAElFTkSuQmCC</image> <keyframes>250</keyframes> </sprite> <sprite width="16" height="16" name="unicolors_16_16"> <image>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</image> </sprite> </spriteSheets>

[nightm4re94]

<sup>This post has been migrated automatically from the old LITIENGINE forum (2018 - 2022).
Posted: 2018-11-20 10:41:26
User: Jikai [] (age: 1449 days 🔥; posts: 13)</sup>
CalvinMT Ok I see, is it mandatory for the engine to find the image or can we avoid editing the litidata?
I the sprites.info sufficient to describe the animation and sprite?

[nightm4re94]

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Posted: 2018-11-20 11:27:53
User: CalvinMT [] (age: 1451 days 🔥; posts: 114)</sup>
Jikai
According to this post: steffen, I think that editing the ".litidata" file is avoidable. The "sprites.info" has all the information, so I also think that it is self sufficient.
But I haven't got a clue how... :/

[nightm4re94]

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Posted: 2018-12-03 15:09:21
User: Dmartin42 [] (age: 1435 days 🔥; posts: 36)</sup>
@CalvinMT How did your create the sprites.info? In notepad? What about the player.png? do I need a png for each sprite position?

[nightm4re94]

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Posted: 2018-12-03 15:50:30
User: CalvinMT [] (age: 1451 days 🔥; posts: 114)</sup>
Dmartin42
You need to create the "sprites.info" file.
Each of your PNGs contain the sequence to one animation of a character.
I've replied to your post on Github aswell.
Might have more information.
https://github.com/CalvinMT/LITIengine\_test/issues/2#issuecomment-443751985

[nightm4re94]

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Posted: 2018-12-03 19:38:38
User: Dmartin42 [] (age: 1435 days 🔥; posts: 36)</sup>
CalvinMT
I uploaded my product on the github

[nightm4re94]

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Posted: 2018-12-04 16:44:32
User: Dmartin42 [] (age: 1435 days 🔥; posts: 36)</sup>
CalvinMT
I added another issue on Github

[nightm4re94]

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Posted: 2018-12-04 19:20:29
User: steffen [Admin 👑, Mod 🔧] (age: 1568 days 🔥; posts: 100)</sup>
Dmartin42 Any particular reason, why you don't discuss the topic in this forum? It might also be helpful for others here :)

[nightm4re94]

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Posted: 2018-12-05 12:59:49
User: CalvinMT [] (age: 1451 days 🔥; posts: 114)</sup>
steffen Dmartin42
True.
We started off talking about what I did on my Github project. That's why we ended up there.
I'll clarify things discussed here.

• - Images of your sprites must be a sequence of an animation.
  i.e.: one image contains sprites of the moving/facing up animation, one for the moving/facing down, etc...
• - Each sprites of an image must be of the same height and length.
• - The "sprites.info" file needs to be created and edited with a text editing software such as "Notepad" or "Notepad++" (recommended) for users under Windows.
• - "sprites.info" can have any name that you want. But it needs to end with ".info".
• - Go to this post to learn what to do with the "sprites.info" file: CalvinMT

Hopefully, there will soon be a tutorial at this address:
https://docs.litiengine.com/getting-started/managing-resources/images

[nightm4re94]

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Posted: 2018-12-05 18:39:53
User: Dmartin42 [] (age: 1435 days 🔥; posts: 36)</sup>
steffen
As soon as I get it to where I want, I will create a tutorial for others to follow. Just need collision and then I'll start. Do you know how to create collision between a creature and another object/creature/Rectangle??????
I just want to know how to do collision

[nightm4re94]

<sup>This post has been migrated automatically from the old LITIENGINE forum (2018 - 2022).
Posted: 2018-12-06 01:00:21
User: steffen [Admin 👑, Mod 🔧] (age: 1568 days 🔥; posts: 100)</sup>
In general: Everything that can be handled by the ~~~~PhysicsEngine (accessed via ~~~~Game.getPhysicsEngine()) can participate in a collision process. Now, that being said, we provide basic implementations that already implement ~~~~ICollisionEntity (e.g. ~~~~Creature) and if you move such entities using ~~~~Game.getPhysicsEngine().move(...), the movement will respect all static ~~~~CollisionBoxes and other entities that have collision enabled.
If you add a ~~~~CollisionBox or an entity that implements ~~~~ICollisionEntiy to your ~~~~Environment, it will automatically be known by the ~~PhysicsEngine.
****~~Example from the ~~~~MovementController:****
~~```~~Point2D newLocation = new Point2D.Double(this.getEntity().getX() + dX, this.getEntity().getY() + dY); Game.getPhysicsEngine().move(this.getEntity(), newLocation);```` I've created ~~[~~Issue 195](https://github.com/gurkenlabs/litiengine/issues/195) to provide a proper documentation about the ~~~~PhysicsEngine` and the related workflows.

[nightm4re94]

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Posted: 2018-12-07 19:09:24
User: Dmartin42 [] (age: 1435 days 🔥; posts: 36)</sup>
steffen
Ok I got my collision working. Thanks. Now how do I add gravity. This is my final question for my test liti engine.

[nightm4re94]

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Posted: 2018-12-11 14:11:50
User: Dmartin42 [] (age: 1435 days 🔥; posts: 36)</sup>
steffen
Steffen, I was wondering if there was a way to implement gravity into my game. I am making a plat former.

[nightm4re94]

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Posted: 2018-12-11 20:09:06
User: nightm4re [Admin 👑, Mod 🔧] (age: 1567 days 🔥; posts: 185)</sup>

Dmartin42 Have you had a look at ~~~~de.gurkenlabs.litiengine.physics.GravityForce?

[nightm4re94]

<sup>This post has been migrated automatically from the old LITIENGINE forum (2018 - 2022).
Posted: 2018-12-11 20:13:56
User: steffen [Admin 👑, Mod 🔧] (age: 1568 days 🔥; posts: 100)</sup>
Dmartin42 There are currently a few ways to achieve this but there is no single recommended way at the moment. We've implemented this in test games using the ~~~~Force class. In another project, we've manually appended the gravity to the ~~MovementController.update() method. I'll get back to you on this topic in a few days and provide you with a working example. Sadly, I don't have time right now to do so.
Also: We'll create the Demo platformer ****~~Gurk Nukem**** over the course of the upcoming weeks so there will definitely be an example of a gravity implementation there: You might want to star the related ~~~~GitHub Repo.