Need help creating player entity

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Jikai

steffen CalvinMT nice to know. It means that utiLITI will only update the sprites.info right? I will not update the litidata (map) file I guess?
So I can do it manually inside the sprites.info?

I think my loading is failing cause I've specified 2 frames length while I currently only have 1 frame (static image).
I'll try this out then.

Is there a way to load a full image file, I mean, with all animations on a single png file? Like first line is UP walk, then next line is RIGHT walk and so on?

CalvinMT

Jikai
If you look into the "ldjam42" project on GitHub, you will see that each animation has its own file.
And because you cannot specify the position of a keaframe in the "sprites.file", I think it isn't possible.

utiLITI upadates the ".litidata" file when importing "sprites.info".
What I did is to, as you said, manually modify the "sprites.info" accordingly to what I wanted.

Jikai

CalvinMT Yes I saw it in the ldjam42, just wondered if it was possible

And what does it add in the litidata? just for my knowledge..

CalvinMT

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>

Jikai

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?

CalvinMT

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... :/

Dmartin42

@CalvinMT How did your create the sprites.info? In notepad? What about the player.png? do I need a png for each sprite position?

CalvinMT

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

Dmartin42

CalvinMT
I uploaded my product on the github

Dmartin42

CalvinMT
I added another issue on Github

CalvinMT

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

steffen

Dmartin42 Any particular reason, why you don't discuss the topic in this forum? It might also be helpful for others here

Dmartin42

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

steffen

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 to provide a proper documentation about the PhysicsEngine and the related workflows.

Dmartin42

steffen
Ok I got my collision working. Thanks. Now how do I add gravity. This is my final question for my test liti engine.

Dmartin42

steffen
Steffen, I was wondering if there was a way to implement gravity into my game. I am making a plat former.

nightm4re

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

steffen

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.